Annotation of loncom/homework/functionplotresponse.pm, revision 1.71

1.1       www         1: # LearningOnline Network with CAPA
1.70      www         2: # Functionplot responses
1.1       www         3: #
1.71    ! www         4: # $Id: functionplotresponse.pm,v 1.70 2011/11/18 16:39:22 www Exp $
1.1       www         5: #
                      6: # Copyright Michigan State University Board of Trustees
                      7: #
                      8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                      9: #
                     10: # LON-CAPA is free software; you can redistribute it and/or modify
                     11: # it under the terms of the GNU General Public License as published by
                     12: # the Free Software Foundation; either version 2 of the License, or
                     13: # (at your option) any later version.
                     14: #
                     15: # LON-CAPA is distributed in the hope that it will be useful,
                     16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     18: # GNU General Public License for more details.
                     19: #
                     20: # You should have received a copy of the GNU General Public License
                     21: # along with LON-CAPA; if not, write to the Free Software
                     22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     23: #
                     24: # /home/httpd/html/adm/gpl.txt
                     25: #
                     26: # http://www.lon-capa.org/
                     27: #
                     28: 
                     29: package Apache::functionplotresponse;
                     30: use strict;
                     31: use Apache::response();
                     32: use Apache::lonlocal;
                     33: use Apache::lonnet;
1.65      www        34: use Apache::run;
1.36      www        35:  
1.1       www        36: BEGIN {
1.37      www        37:   &Apache::lonxml::register('Apache::functionplotresponse',('functionplotresponse','backgroundplot','spline',
1.70      www        38:                                                             'plotobject','plotvector',
1.37      www        39:                                                             'functionplotrule','functionplotruleset',
                     40:                                                             'functionplotelements'));
1.1       www        41: }
                     42: 
1.5       www        43: #
                     44: # There can be a number of applets on a page, each called ggbApplet_$id, 
                     45: # where $id is the "_"-concatenated part and responseid
                     46: #
                     47: 
1.1       www        48: sub geogebra_startcode {
1.3       www        49:     my ($id)=@_;
1.1       www        50:     return (<<ENDSTARTCODE);
1.3       www        51: <applet name="ggbApplet_$id" code="geogebra.GeoGebraApplet" archive="geogebra.jar"
1.40      www        52:          codebase="/adm/geogebra/"  width="722" height="447" MAYSCRIPT>
1.1       www        53:        <param name="java_arguments" value="-Xmx512m -Djnlp.packEnabled=true"/>
                     54: ENDSTARTCODE
                     55: }
                     56: 
                     57: sub geogebra_endcode {
1.2       www        58:     return &Apache::lonhtmlcommon::java_not_enabled()."</applet>\n";
                     59: }
                     60: 
1.5       www        61: #
                     62: # This is the internal GeoGebra bytecode which defines the spline functions
                     63: #
1.2       www        64: sub geogebra_spline_program {
                     65:     return (<<ENDSPLINEPROGRAM);
1.57      www        66: <param name="ggbBase64" value="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"/>
1.2       www        67: ENDSPLINEPROGRAM
                     68: }
                     69: 
1.5       www        70: #
                     71: # The standard set of parameters inside <applet>
                     72: #
1.2       www        73: sub geogebra_default_parameters {
1.3       www        74:    my ($id)=@_;
1.2       www        75:    return(<<ENDDEFAULTPARAMETERS);
                     76:         <param name="image" value="/adm/lonIcons/lonanim.gif"  />
                     77:         <param name="boxborder" value="false"  />
                     78:         <param name="centerimage" value="true"  />
1.62      www        79: 	<param name="cache_archive" value="geogebra.jar, geogebra_main.jar, geogebra_gui.jar, geogebra_cas.jar, geogebra_export.jar, geogebra_algos.jar, geogebra_javascript.jar, geogebra_properties.jar, jlatexmath.jar, jlm_cyrillic.jar, jlm_greek.jar" />
1.69      www        80: 	<param name="cache_version" value="4.0.1.0,4.0.1.0,4.0.1.0,4.0.1.0,4.0.1.0,4.0.1.0,4.0.1.0,4.0.1.0,4.0.1.0,4.0.1.0,4.0.1.0" />
1.2       www        81:         <param name="framePossible" value="false" />
                     82: 
                     83:         <param name="showResetIcon" value="false" />
                     84:         <param name="showAnimationButton" value="false" />
                     85:         <param name="enableRightClick" value="false" />
                     86:         <param name="errorDialogsActive" value="true" />
                     87:         <param name="enableLabelDrags" value="false" />
                     88:         <param name="showMenuBar" value="false" />
                     89:         <param name="showToolBar" value="false" />
                     90:         <param name="showToolBarHelp" value="false" />
                     91:         <param name="showAlgebraInput" value="false" />
                     92:         <param name="enableShiftDragZoom" value="false" />
                     93:         <param name="allowRescaling" value="false" />
                     94:         <param name="enableLabelDrags" value="false" />
1.3       www        95:         <param name="ggbOnInitParam" value="applet_$id" />
1.2       www        96: ENDDEFAULTPARAMETERS
1.1       www        97: }
                     98: 
1.5       www        99: #
                    100: # This subroutine is called by LON-CAPA at </problem>
                    101: # Each applet on the page will call function ggbOnInit when it is done loading
                    102: # This function in turn will call the respective function registered by start_init_script
                    103: # Which one of the registered functions is called is determined by ggbOnInitParam, which GeoGebra passes to ggbOnInit
                    104: #
                    105: 
1.3       www       106: sub init_script {
1.16      www       107:    if ($#Apache::functionplotresponse::callscripts>=0) {
                    108:       my $script='';
                    109:       foreach my $id (@Apache::functionplotresponse::callscripts) {
                    110:           $script.="if (param=='applet_$id') { loaded_$id=true; }\n";
                    111:       }
                    112:       $script.="if (".join(' && ',map { "loaded_$_" } (@Apache::functionplotresponse::callscripts)).
1.52      www       113:                ") { setTimeout('ggbInitAll()',200) }";
1.16      www       114:       my $calls=join("\n",map { "ggbInit_$_();" } (@Apache::functionplotresponse::callscripts)); 
1.3       www       115:       return (<<ENDGGBINIT);
                    116: <script type="text/javascript">
                    117: // <![CDATA[
1.16      www       118: // Function that each applet will call when loaded
                    119: // It will pass "its" parameter
                    120: // Set flags for when an applet is loaded, wait till all are loaded, and then some
1.3       www       121: function ggbOnInit(param) {
1.16      www       122: $script
                    123: }
                    124: function ggbInitAll() {
1.17      www       125: $calls
1.3       www       126: }
                    127: // ]]>
                    128: </script>
                    129: ENDGGBINIT
                    130:    }
                    131: }
                    132: 
1.5       www       133: #
                    134: # Each Geogebra applet is supposed to call this when parameters change
1.10      www       135: # Changes the hidden fields on the web page
1.5       www       136: #
                    137: sub update_script {
                    138:     my ($id)=@_;
                    139:     return (<<ENDUPDATESCRIPT);
                    140: <script type="text/javascript">
                    141: // <![CDATA[
                    142: function updatePointCoordinates_$id(coordinateName) {
                    143:             var x = document.ggbApplet_$id.getXcoord(coordinateName);
                    144:             var y = document.ggbApplet_$id.getYcoord(coordinateName);
1.9       www       145:             document.lonhomework.elements["HWVAL_$id\_" + coordinateName + "_x"].value = x;
                    146:             document.lonhomework.elements["HWVAL_$id\_" + coordinateName + "_y"].value = y;
1.5       www       147:         }
                    148: // ]]>
                    149: </script>
                    150: ENDUPDATESCRIPT
                    151: }
                    152: 
                    153: #
                    154: # Register the above update-handler for a variable
                    155: #
                    156: 
                    157: sub update_register {
                    158:    my ($id,$variable)=@_;
1.6       www       159:    return "document.ggbApplet_$id.registerObjectUpdateListener('$variable','updatePointCoordinates_$id');\n";
                    160: }
                    161: 
                    162: #
1.40      www       163: # Set a point coordinate variable
1.6       www       164: #
1.40      www       165: sub set_point_coordinate {
1.48      www       166:    my ($id,$variable,$x,$y,$fixed)=@_;
                    167:    my $mult=($fixed?'a*':'');
1.68      www       168: # Get rid of wild exponents, make sure it's a number
                    169:    $x=1.*$x;
                    170:    $y=1.*$y;
                    171: # GeoGebra does not understand "E"
                    172:    $x=~s/[e|E]/\*10\^/;
                    173:    $x=~s/\+//;
                    174:    $y=~s/[e|E]/\*10\^/;
                    175:    $y=~s/\+//;
1.6       www       176:    return (<<ENDSETVARIABLE);
1.48      www       177: document.ggbApplet_$id.evalCommand("a=1");
                    178: document.ggbApplet_$id.evalCommand("$variable=$mult($x,$y)");
1.40      www       179: document.ggbApplet_$id.setLabelVisible("$variable",false);
1.6       www       180: ENDSETVARIABLE
                    181: }
                    182: 
                    183: #
1.40      www       184: # Set a slope coordinate variable
                    185: #
                    186: sub set_slope_coordinate {
1.48      www       187:    my ($id,$variable,$xrel,$yrel,$xmin,$xmax,$ymin,$ymax,$pointname,$fixed)=@_;
1.40      www       188:    my $xvariable=$variable.'x';
                    189:    my $yvariable=$variable.'y';
                    190:    my $domain=$xmax-$xmin;
                    191:    my $range=$ymax-$ymin;
                    192:    my $xinterval=$domain/100.;
                    193:    my $yinterval=$range/200.;
1.48      www       194:    my $mult=($fixed?'a*':'');
1.40      www       195:    return (<<ENDSETSVARIABLE);
1.48      www       196: document.ggbApplet_$id.evalCommand("a=1");
1.51      www       197: document.ggbApplet_$id.evalCommand("$xvariable=Slider[$xinterval,$domain,$xinterval]");
1.40      www       198: document.ggbApplet_$id.setVisible("$xvariable", false);
                    199: document.ggbApplet_$id.evalCommand("$xvariable=$xrel");
                    200: document.ggbApplet_$id.evalCommand("$yvariable=Slider[-$range,$range,$yinterval]");
                    201: document.ggbApplet_$id.setVisible("$yvariable", false);
                    202: document.ggbApplet_$id.evalCommand("$yvariable=$yrel");
1.48      www       203: document.ggbApplet_$id.evalCommand("$variable=$mult($xvariable+x($pointname),$yvariable+y($pointname))");
1.40      www       204: document.ggbApplet_$id.setLabelVisible("$variable", false);
                    205: ENDSETSVARIABLE
                    206: }
                    207: 
                    208: #
1.9       www       209: # Input field name for a coordinate variable
                    210: #
                    211: 
                    212: sub field_name {
                    213:     my ($id,$variable,$name)=@_;
                    214:     return "HWVAL_$id\_$variable\_$name";
                    215: }
                    216: 
                    217: #
                    218: # Generate an input field for a coordinate variable
                    219: #
                    220: 
                    221: sub generate_input_field {
                    222:     my ($id,$variable,$x,$y)=@_;
                    223:     $Apache::functionplotresponse::inputfields.=
                    224:        "<input type='hidden' name='".&field_name($id,$variable,'x')."' value='$x' />\n".
                    225:        "<input type='hidden' name='".&field_name($id,$variable,'y')."' value='$y' />\n";
                    226: }
                    227: 
                    228: #
1.40      www       229: # Initialize a new point coordinate variable at set a listener on it
1.6       www       230: #
1.40      www       231: sub new_point_coordinate {
1.48      www       232:     my ($id,$variable,$x,$y,$fixed)=@_;
1.11      www       233:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'x')})) {
1.10      www       234:        $x=$Apache::functionplotresponse::previous{&field_name($id,$variable,'x')};
                    235:     }
1.11      www       236:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'y')})) {
1.10      www       237:        $y=$Apache::functionplotresponse::previous{&field_name($id,$variable,'y')};
                    238:     }
1.9       www       239:     &generate_input_field($id,$variable,$x,$y);
1.48      www       240:     return &set_point_coordinate($id,$variable,$x,$y,$fixed).&update_register($id,$variable);
1.40      www       241: }
                    242: 
                    243: #
                    244: # Initialize a new slope coordinate variable at set a listener on it
                    245: #
                    246: sub new_slope_coordinate {
1.48      www       247:     my ($id,$variable,$x,$y,$pointname,$xp,$yp,$xmin,$xmax,$ymin,$ymax,$fixed)=@_;
1.40      www       248: #
                    249: # $variable: name of the slope point
                    250: # $x, $y: coordinates of the slope point
                    251: # $pointname: name of the associated point point
                    252: # $xp $yp: coordinates of the point point
                    253: #
                    254:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'x')})) {
                    255:        $x=$Apache::functionplotresponse::previous{&field_name($id,$variable,'x')};
                    256:     }
                    257:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'y')})) {
                    258:        $y=$Apache::functionplotresponse::previous{&field_name($id,$variable,'y')};
                    259:     }
                    260:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$pointname,'x')})) {
                    261:        $xp=$Apache::functionplotresponse::previous{&field_name($id,$pointname,'x')};
                    262:     }
                    263:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$pointname,'y')})) {
                    264:        $yp=$Apache::functionplotresponse::previous{&field_name($id,$pointname,'y')};
                    265:     }
                    266: 
                    267:     &generate_input_field($id,$variable,$x,$y);
                    268:     my $xrel=$x-$xp;
                    269:     my $yrel=$y-$yp;
1.48      www       270:     return &set_slope_coordinate($id,$variable,$xrel,$yrel,$xmin,$xmax,$ymin,$ymax,$pointname,$fixed).&update_register($id,$variable);
1.5       www       271: }
                    272: 
                    273: #
                    274: # This registers the init-function call for ggbOnInit, which LON-CAPA will place at </problem>
                    275: # It then starts the right headers
                    276: #
1.3       www       277: sub start_init_script {
                    278:     my ($id)=@_;
1.16      www       279: # Add id to the list of ggbInit_$id functions that need to be called
                    280:     push(@Apache::functionplotresponse::callscripts,$id);
1.5       www       281: # ... and open this function
1.3       www       282:     return (<<ENDSTARTINIT);
                    283: <script type="text/javascript">
                    284: // <![CDATA[
1.5       www       285: // variable that will eventually be passed back to the server
                    286: var coordinateMap_$id = [];
1.16      www       287: // flag for not loaded yet
                    288: var loaded_$id=false;
1.5       www       289: // Init-function for applet
1.3       www       290: function ggbInit_$id() {
                    291: ENDSTARTINIT
                    292: }
                    293: 
1.5       www       294: #
                    295: # This sets the axes inside ggbInit_$id
                    296: #
                    297: 
1.4       www       298: sub axes_script {
                    299:     my ($id,$xmin,$xmax,$ymin,$ymax,$xvisible,$yvisible,$gvisible)=@_;
                    300:     return (<<ENDAXESSCRIPT);
                    301:             // changes (xmin, xmax, ymin, ymax)
                    302:             document.ggbApplet_$id.setCoordSystem($xmin,$xmax,$ymin,$ymax);
                    303: 
                    304:             // makes the (x,y) axis (in)visible
                    305:             document.ggbApplet_$id.setAxesVisible($xvisible,$yvisible);
                    306:             // makes the grid (in)visible
                    307:             document.ggbApplet_$id.setGridVisible($gvisible);
                    308: ENDAXESSCRIPT
                    309: }
                    310: 
1.14      www       311: sub axes_label {
1.45      www       312:     my ($id,$xmin,$xmax,$ymin,$ymax,$xlabel,$ylabel)=@_;
1.14      www       313:     unless ($xlabel || $ylabel) { return ''; }
                    314:     my $return='document.ggbApplet_'.$id.'.evalCommand("topRight=Corner[3]");';
                    315:     if ($xlabel) {
1.45      www       316:       if (($ymin<0) && ($ymax>0)) {
1.14      www       317:        $return.=(<<ENDXAXISLABELSCRIPT);
                    318: document.ggbApplet_$id.evalCommand("Xlabel=(x(topRight)-AxisStepX[],AxisStepY[]/6)");
                    319: document.ggbApplet_$id.setVisible("Xlabel",false);
                    320: document.ggbApplet_$id.evalCommand("Text[\\"$xlabel\\", Xlabel]");
                    321: ENDXAXISLABELSCRIPT
1.45      www       322:       } else {
                    323:        $return.=(<<ENDXOFFAXISLABEL);
                    324: document.ggbApplet_$id.evalCommand("LowerRight=Corner[2]");
                    325: document.ggbApplet_$id.evalCommand("Text[\\"$xlabel\\", (x(LowerRight) - AxisStepX[], y(LowerRight) + AxisStepY[] / 2)]");
                    326: ENDXOFFAXISLABEL
                    327:       }
1.14      www       328:     }
                    329:     if ($ylabel) {
1.45      www       330:       if (($xmin<0) && ($xmax>0)) {
1.14      www       331:        $return.=(<<ENDYAXISLABELSCRIPT);
                    332: document.ggbApplet_$id.evalCommand("Ylabel=(AxisStepX[]/6,y(topRight)-AxisStepY[]/3)");
                    333: document.ggbApplet_$id.setVisible("Ylabel",false);
                    334: document.ggbApplet_$id.evalCommand("Text[\\"$ylabel\\", Ylabel]");
                    335: ENDYAXISLABELSCRIPT
1.45      www       336:       } else {
                    337:        $return.=(<<ENDYOFFAXISLABEL);
                    338: document.ggbApplet_$id.evalCommand("UpperLeft=Corner[4]");
                    339: document.ggbApplet_$id.evalCommand("Text[\\"$ylabel\\", (x(UpperLeft) + AxisStepX[] / 5, y(UpperLeft) - AxisStepY[] / 1.8)]");
                    340: ENDYOFFAXISLABEL
                    341:       }
1.14      www       342:     }
                    343:     return $return;
                    344: }
                    345: 
1.58      www       346: #
                    347: # Subroutine to produce background and answer plots
                    348: #
                    349: 
1.4       www       350: sub plot_script {
1.47      www       351:    my ($id,$function,$fixed,$label,$color,$xmin,$xmax,$thickness)=@_;
1.41      www       352:    $label=~s/\W//g;
                    353:    if (($label) && ($label!~/^[A-Za-z]/)) {
                    354:       $label='C'.$label;
                    355:    }
                    356:    my $visible=0;
                    357:    if ($label) {
                    358:       $visible="1";
                    359:    } else {
                    360:       $Apache::functionplotresponse::counter++;
                    361:       $label='C'.$Apache::functionplotresponse::counter;
                    362:    }
1.46      www       363:    my $rc=0;
                    364:    my $gc=0;
                    365:    my $bc=0;
                    366:    if ($color) {
                    367:       my ($rh,$gh,$bh)=($color=~/(..)(..)(..)/);
                    368:       $rc=hex($rh);
                    369:       $gc=hex($gh);
                    370:       $bc=hex($bh);
                    371:    }
1.6       www       372:    if ($fixed) {
1.43      www       373:       return "document.ggbApplet_$id.evalCommand('$label=Function[$function,$xmin,$xmax]');\n".
1.46      www       374:              ($visible?'':"document.ggbApplet_$id.setLabelVisible('$label', false);\n").
1.47      www       375:              ($color?"document.ggbApplet_$id.setColor('$label',$rc,$gc,$bc);\n":'').
                    376:              ($thickness?"document.ggbApplet_$id.setLineThickness('$label',$thickness);\n":'');
1.6       www       377:    } else {
1.46      www       378:        return "document.ggbApplet_$id.evalCommand('y=$function');\n";
1.6       www       379:    }
1.4       www       380: }
                    381: 
1.5       www       382: #
1.70      www       383: # Subroutine to produce objects
                    384: #
                    385: 
                    386: sub plotobject_script {
                    387:    my ($id,$label,$x,$y)=@_;
                    388:    unless ($label) {
                    389:       $Apache::functionplotresponse::counter++;
                    390:       $label='O'.$Apache::functionplotresponse::counter;
                    391:    }
                    392:    return "document.ggbApplet_$id.evalCommand('a=1');\n".
                    393:           "document.ggbApplet_$id.setVisible('a', false);\n".
                    394:           "document.ggbApplet_$id.setLabelVisible('a', false);\n".
                    395:           "document.ggbApplet_$id.evalCommand('$label=a*($x,$y)');\n".
                    396:           "document.ggbApplet_$id.setVisible('$label', true);\n".
                    397:           "document.ggbApplet_$id.setLabelVisible('$label', true);\n";
                    398: }
                    399: 
                    400: #
                    401: # Subroutine to produce vectors
                    402: #
                    403: 
                    404: sub plotvector_script {
                    405:    my ($id,$label,$xs,$ys,$xe,$ye)=@_;
                    406:    unless ($label) {
                    407:       $Apache::functionplotresponse::counter++;
                    408:       $label='V'.$Apache::functionplotresponse::counter;
                    409:    }
1.71    ! www       410:    my $startlabel=$label.'Start';
        !           411:    my $endlabel=$label.'End';
        !           412:    my $pointlabel=$label.'Point';
        !           413:    my $anglelabel=$label.'Angle';
1.70      www       414:    return(<<ENDVECTOR);
1.71    ! www       415: document.ggbApplet_$id.evalCommand("$startlabel=($xs,$ys)");
        !           416: document.ggbApplet_$id.setVisible("$startlabel",false);
        !           417: document.ggbApplet_$id.setLabelVisible("$startlabel",false);
        !           418: document.ggbApplet_$id.evalCommand("$endlabel=($xe,$ye)");
        !           419: document.ggbApplet_$id.setLabelVisible("$endlabel",false);
        !           420: document.ggbApplet_$id.evalCommand("$label=Vector[$startlabel,$endlabel]");
        !           421: document.ggbApplet_$id.setLabelVisible("$label",true);
        !           422: document.ggbApplet_$id.setLineThickness("$label",8);
1.70      www       423: // Displays the Angle
1.71    ! www       424: //document.ggbApplet1.evalCommand("Gravitypoint=(110,y(Gravitystart))"); //The x-value for this should be 2*(xmax-xmin)+xmax;
        !           425: //document.ggbApplet1.evalCommand("GravityAngle=Angle[Gravitypoint,Gravitystart,Gravityend]");
        !           426: //document.ggbApplet1.setLabelVisible("GravityAngle",true);
        !           427: //document.ggbApplet1.setLabelStyle("GravityAngle",VALUE=2);
1.70      www       428: // Keeps track of points we care about (This should use the same listener function we use in graph problems)
                    429: //document.ggbApplet1.registerObjectUpdateListener('Gravitystart','updatePointCoordinates');
                    430: //document.ggbApplet1.registerObjectUpdateListener('Gravityend','updatePointCoordinates');
                    431: //document.ggbApplet1.registerObjectUpdateListener('GravityAngle','updatePointCoordinates');
                    432: ENDVECTOR
                    433: }
                    434: 
                    435: #
1.58      www       436: # Answer spline display
                    437: # 
                    438: # points: x,y,slope_x,slope_y
                    439: 
                    440: sub answer_spline_script {
                    441:    my ($id,@points)=@_;
                    442:    my $order=int(($#points+1)/4);
                    443:    if ($order<2) { $order=2; }
                    444:    if ($order>8) { $order=8; }
                    445:    $Apache::functionplotresponse::counter++;
1.60      www       446:    my $label='CSpline'.$Apache::functionplotresponse::counter;
1.59      www       447:    my $output='document.ggbApplet_'.$id.'.evalCommand("'.$label.'=Spline'.$order.'[';
                    448:    for (my $i=0;$i<=$#points;$i+=4) {
                    449:       $output.="($points[$i],$points[$i+1]),($points[$i+2],$points[$i+3]),";
                    450:    }
                    451:    $output=~s/\,$//;
                    452:    $output.=']");'."\n";
                    453:    for (my $i=2; $i<2*$order; $i+=2) {
1.61      www       454:        $output.='document.ggbApplet_'.$id.'.setColor("'.$label.'_'.($i>=10?'{':'').$i.($i>=10?'}':'').'",0,170,0);'."\n";
1.59      www       455:    }
1.60      www       456:    for (my $i=1; $i<2*$order; $i+=2) {
1.61      www       457:        $output.='document.ggbApplet_'.$id.'.setVisible("'.$label.'_'.($i>=10?'{':'').$i.($i>=10?'}':'').'",false);'."\n";
1.60      www       458:    }
                    459: 
1.59      www       460:    return $output;
1.58      www       461: }
                    462: 
                    463: #
1.7       www       464: # Subroutine that generates code for spline $label based on stored information
1.6       www       465: #
                    466: 
                    467: sub generate_spline {
1.48      www       468:    my ($id,$label,$xmin,$xmax,$ymin,$ymax,$fixed)=@_;
1.6       www       469:    my $result='';
1.7       www       470:    my $order=$Apache::functionplotresponse::splineorder{$label};
                    471:    my $x=$Apache::functionplotresponse::splineinitx{$label};
                    472:    my $y=$Apache::functionplotresponse::splineinity{$label};
                    473:    my $sx=$Apache::functionplotresponse::splinescalex{$label};
                    474:    my $sy=$Apache::functionplotresponse::splinescaley{$label};
                    475:    my @coords=();
                    476:    foreach my $i (1..$order) {
1.48      www       477:        $result.=&new_point_coordinate($id,$label.'P'.$i,$x,$y,$fixed);
1.40      www       478:        my $xp=$x;
1.8       www       479:        $x+=$sx/(2.*($order-1));
1.7       www       480:        push(@coords,$label.'P'.$i);
1.48      www       481:        $result.=&new_slope_coordinate($id,$label.'S'.$i,$x,$y+$sy,$label.'P'.$i,$xp,$y,$xmin,$xmax,$ymin,$ymax,$fixed);
1.8       www       482:        $x+=$sx/(2.*($order-1));
1.7       www       483:        push(@coords,$label.'S'.$i);
                    484:    }
                    485:    $result.='document.ggbApplet_'.$id.'.evalCommand("Spline'.$order.'['.join(',',@coords).']");'."\n";
1.6       www       486:    return $result;
                    487: }
1.70      www       488: 
                    489: #
                    490: # Object
                    491: #
                    492: 
                    493: sub start_plotobject {
                    494:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    495:    my $result='';
                    496:    my $internalid = $Apache::inputtags::part.'_'.$Apache::inputtags::response[-1];
                    497:    my $x=&Apache::lonxml::get_param('x',$parstack,$safeeval);
                    498:    my $y=&Apache::lonxml::get_param('y',$parstack,$safeeval);
                    499:    my $label=&Apache::lonxml::get_param('label',$parstack,$safeeval);
                    500:    $label=~s/\W//gs;
                    501:    $label=ucfirst($label);
                    502:    unless ($label) { $label="NewObject"; }
                    503:    if ($target eq 'web') {
                    504:       my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval,-3);
                    505:       unless (defined($x)) { $x=$xmin; }
                    506:       unless (defined($y)) { $y=$ymin; }
                    507:       $result.=&plotobject_script($internalid,$label,$x,$y);
                    508:    } elsif ($target eq 'edit') {
                    509:         $result=&Apache::edit::tag_start($target,$token,'Plot Object').
                    510:              &Apache::edit::text_arg('Label on Plot:','label',
                    511:                                      $token,'16').
                    512:              &Apache::edit::text_arg('x:','x',
                    513:                                      $token,'8').
                    514:              &Apache::edit::text_arg('y:','y',
                    515:                                      $token,'8').
                    516:              &Apache::edit::end_row();
                    517:   } elsif ($target eq 'modified') {
                    518:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,'label','x','y');
                    519:     if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
                    520:   }
                    521:   return $result;
                    522: }
                    523: 
                    524: sub end_plotobject {
                    525:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    526:    my $result='';
                    527:    if ($target eq 'edit') {
                    528:        $result=&Apache::edit::end_table();
                    529:    }
                    530:    return $result;
                    531: }
                    532: 
1.71    ! www       533: #
        !           534: # Vector
        !           535: #
        !           536: 
        !           537: sub start_plotvector {
        !           538:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
        !           539:    my $result='';
        !           540:    my $internalid = $Apache::inputtags::part.'_'.$Apache::inputtags::response[-1];
        !           541:    my $tailx=&Apache::lonxml::get_param('tailx',$parstack,$safeeval);
        !           542:    my $taily=&Apache::lonxml::get_param('taily',$parstack,$safeeval);
        !           543:    my $tipx=&Apache::lonxml::get_param('tipx',$parstack,$safeeval);
        !           544:    my $tipy=&Apache::lonxml::get_param('tipy',$parstack,$safeeval);
        !           545: 
        !           546:    my $label=&Apache::lonxml::get_param('label',$parstack,$safeeval);
        !           547:    $label=~s/\W//gs;
        !           548:    $label=ucfirst($label);
        !           549:    unless ($label) { $label="NewVector"; }
        !           550:    if ($target eq 'web') {
        !           551:       my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval,-3);
        !           552:       unless (defined($tailx)) { $tailx=$xmin; }
        !           553:       unless (defined($taily)) { $taily=$ymin; }
        !           554:       unless (defined($tipx)) { $tipx=$xmin; }
        !           555:       unless (defined($tipy)) { $tipy=$ymin; }
        !           556:       $result.=&plotvector_script($internalid,$label,$tailx,$taily,$tipx,$tipy);
        !           557:    } elsif ($target eq 'edit') {
        !           558:         $result=&Apache::edit::tag_start($target,$token,'Plot Vector').
        !           559:              &Apache::edit::text_arg('Label on Plot:','label',
        !           560:                                      $token,'16').
        !           561:              &Apache::edit::text_arg('Tail x:','tailx',
        !           562:                                      $token,'8').
        !           563:              &Apache::edit::text_arg('Tail y:','taily',
        !           564:                                      $token,'8').
        !           565:              &Apache::edit::text_arg('Tip x:','tipx',
        !           566:                                      $token,'8').
        !           567:              &Apache::edit::text_arg('Tip y:','tipy',
        !           568:                                      $token,'8').
        !           569: 
        !           570:              &Apache::edit::end_row();
        !           571:   } elsif ($target eq 'modified') {
        !           572:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,'label','tailx','taily','tipx','tipy');
        !           573:     if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
        !           574:   }
        !           575:   return $result;
        !           576: }
        !           577: 
        !           578: sub end_plotvector {
        !           579:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
        !           580:    my $result='';
        !           581:    if ($target eq 'edit') {
        !           582:        $result=&Apache::edit::end_table();
        !           583:    }
        !           584:    return $result;
        !           585: }
        !           586: 
        !           587: 
1.70      www       588: 
1.6       www       589: #
                    590: # <backgroundplot function="..." fixed="yes/no" />
1.5       www       591: #
1.4       www       592: sub start_backgroundplot {
                    593:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    594:    my $result='';
                    595:    my $internalid = $Apache::inputtags::part.'_'.$Apache::inputtags::response[-1];
                    596:    my $function=&Apache::lonxml::get_param('function',$parstack,$safeeval);
1.47      www       597:    my $xinitial=&Apache::lonxml::get_param('xinitial',$parstack,$safeeval);
                    598:    my $xfinal=&Apache::lonxml::get_param('xfinal',$parstack,$safeeval);
1.41      www       599:    my $label=&Apache::lonxml::get_param('label',$parstack,$safeeval);
1.46      www       600:    my $color=&Apache::lonxml::get_param('color',$parstack,$safeeval);
                    601:    $color=~s/[^a-fA-F0-9]//gs;
                    602:    unless (length($color)==6) { $color=''; }
1.6       www       603:    my $fixed=(&Apache::lonxml::get_param('fixed',$parstack,$safeeval)=~/on|true|yes|1/i?1:0);
                    604:  
1.4       www       605:    unless ($function) { $function="0"; }
                    606:    if ($target eq 'web') {
1.41      www       607:       my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval,-3);
1.47      www       608:       unless (defined($xinitial)) { $xinitial=$xmin; }
                    609:       unless (defined($xfinal)) { $xfinal=$xmax; }
                    610:       $result.=&plot_script($internalid,$function,$fixed,$label,$color,$xinitial,$xfinal);
1.13      www       611:    } elsif ($target eq 'edit') {
                    612:         $result=&Apache::edit::tag_start($target,$token,'Background Function Plot').
                    613:              &Apache::edit::text_arg('Function:','function',
                    614:                                      $token,'16').
1.47      www       615:              &Apache::edit::text_arg('Initial x-value (optional):','xinitial',
                    616:                                      $token,'8').
                    617:              &Apache::edit::text_arg('Final x-value (optional):','xfinal',
                    618:                                      $token,'8').
1.41      www       619:              &Apache::edit::text_arg('Label on Plot:','label',
                    620:                                      $token,'8').
1.46      www       621:              &Apache::edit::text_arg('Color (hex code):','color',
                    622:                                      $token,'8').
1.13      www       623:              &Apache::edit::select_arg('Fixed location:','fixed',
                    624:                                   ['yes','no'],$token).
                    625:              &Apache::edit::end_row();
                    626:   } elsif ($target eq 'modified') {
                    627:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.47      www       628:                                                  $safeeval,'function','label','xinitial','xfinal','color','fixed');
1.13      www       629:     if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
                    630:   }
                    631:   return $result;
1.4       www       632: }
                    633: 
                    634: sub end_backgroundplot {
1.13      www       635:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    636:    my $result='';
                    637:    if ($target eq 'edit') {
                    638:        $result=&Apache::edit::end_table();
                    639:    }
                    640:    return $result;
1.6       www       641: }
                    642: 
                    643: #
1.25      www       644: # <functionplotrule ... />
1.12      www       645: #
1.25      www       646: sub start_functionplotrule {
1.12      www       647:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    648:    my $result='';
1.24      www       649:    my $label=&Apache::lonxml::get_param('index',$parstack,$safeeval);
                    650:    $Apache::functionplotresponse::counter++;
                    651:    if ($label=~/\W/) {
1.25      www       652:       &Apache::lonxml::warning(&mt('Rule indices should only contain alphanumeric characters.'));
1.24      www       653:    }
                    654:    $label=~s/\W//gs;
                    655:    unless ($label) {
                    656:       $label='R'.$Apache::functionplotresponse::counter;
                    657:    } else {
                    658:       $label='R'.$label;
                    659:    }
                    660:    if ($Apache::functionplotresponse::splineorder{$label}) {
1.25      www       661:        &Apache::lonxml::error(&mt('Rule indices must be unique.'));
1.24      www       662:    }
                    663: 
                    664: 
                    665:    if ($target eq 'grade') {
                    666: # Simply remember - in order - for later
1.25      www       667:       my $beginninglabel=&Apache::lonxml::get_param('xinitiallabel',$parstack,$safeeval);
                    668:       my $endinglabel=&Apache::lonxml::get_param('xfinallabel',$parstack,$safeeval);
1.24      www       669:       if (($beginninglabel=~/\W/) || ($endinglabel=~/W/)) {
1.25      www       670:           &Apache::lonxml::warning(&mt('Rule labels must be alphanumeric.'));
1.24      www       671:       }
                    672:       $beginninglabel=~s/\W//gs;
                    673:       $endinglabel=~s/\W//gs;
                    674:       my $relationship=&Apache::lonxml::get_param('relationship',$parstack,$safeeval);
                    675:       $relationship=~s/\W//gs;
                    676:       $relationship=lc($relationship);
                    677:       unless ($relationship=~/^(eq|ge|gt|le|lt|ne)$/) {
1.25      www       678:           &Apache::lonxml::warning(&mt('Rule relationship not defined.'));
1.24      www       679:           $relationship='eq';
                    680:       }
1.35      www       681:       my $derivative=&Apache::lonxml::get_param('derivativeorder',$parstack,$safeeval);
1.42      www       682:       unless (($derivative==-1) || ($derivative==0) || ($derivative==1) || ($derivative==2)) {
1.25      www       683:          &Apache::lonxml::warning(&mt('Rule derivative not defined.'));
1.24      www       684:          $derivative=0;
                    685:       }
1.25      www       686:       push(@Apache::functionplotresponse::functionplotrules,join(':',(
1.24      www       687:            $label,
                    688:            $derivative,
1.25      www       689:            &Apache::lonxml::get_param('xinitial',$parstack,$safeeval),
1.24      www       690:            $beginninglabel,
1.25      www       691:            &Apache::lonxml::get_param('xfinal',$parstack,$safeeval),
1.24      www       692:            $endinglabel,
1.35      www       693:            &Apache::lonxml::get_param('minimumlength',$parstack,$safeeval),
                    694:            &Apache::lonxml::get_param('maximumlength',$parstack,$safeeval),
1.24      www       695:            $relationship,
1.33      www       696:            &Apache::lonxml::get_param('value',$parstack,$safeeval),
                    697:            &Apache::lonxml::get_param('percenterror',$parstack,$safeeval)
1.24      www       698:           )));
                    699:    } elsif ($target eq 'edit') {
1.29      www       700:         $result=&Apache::edit::tag_start($target,$token,'Function Plot Evaluation Rule').
1.36      www       701:              &Apache::edit::text_arg('Index/Name:','index',
                    702:                                      $token,'10').'&nbsp;'.
1.35      www       703:              &Apache::edit::select_arg(&mt('Function:'),'derivativeorder',
1.29      www       704:                                   [['0','Function itself'],
                    705:                                    ['1','First derivative'],
1.42      www       706:                                    ['2','Second derivative'],
                    707:                                    ['-1','Integral']],$token).'<br />'.
1.44      www       708:              &Apache::edit::text_arg('Initial x-value:','xinitial',
1.35      www       709:                                       $token,'8').
1.44      www       710:              &Apache::edit::select_or_text_arg('Initial x-value label:','xinitiallabel',
                    711:                                                [['start','Start of Plot'],
                    712:                                                 ['end','End of Plot']],$token,'8').'<br />'.
1.30      www       713: 
1.44      www       714:              &Apache::edit::text_arg('Final x-value (optional):','xfinal',
1.35      www       715:                                       $token,'8').
1.44      www       716:              &Apache::edit::select_or_text_arg('Final x-value label (optional):','xfinallabel',
1.32      www       717:                                                [['end','End of Plot']],$token,'8').'<br />'.
1.44      www       718:              &Apache::edit::text_arg('Minimum length for range (optional):','minimumlength',
1.35      www       719:                                      $token,'8').
1.44      www       720:              &Apache::edit::text_arg('Maximum length for range (optional):','maximumlength',
1.35      www       721:                                      $token,'8').'<br />'.
1.38      www       722:              &Apache::edit::select_or_text_arg(&mt('Relationship:'),'relationship',
1.29      www       723:                                   [['eq','equal'],
                    724:                                    ['ne','not equal'],
                    725:                                    ['ge','greater than or equal'],
                    726:                                    ['gt','greater than'],
                    727:                                    ['lt','less than'],
                    728:                                    ['le','less than or equal']],$token).
                    729:              $result.= &Apache::edit::select_or_text_arg('Value:','value',
1.65      www       730:                                                [['undef','not defined']],$token,'30').
1.29      www       731:              &Apache::edit::text_arg('Percent error:','percenterror',
1.35      www       732:                                      $token,'8').
1.29      www       733:              &Apache::edit::end_row();
                    734:   } elsif ($target eq 'modified') {
1.54      www       735:     if (($env{'form.'.&Apache::edit::html_element_name('xinitial')} ne '') && ($env{'form.'.&Apache::edit::html_element_name('xinitiallabel')} eq 'start')) {
1.53      www       736:        $env{'form.'.&Apache::edit::html_element_name('xinitiallabel')}='';
                    737:     }
1.54      www       738:     if (($env{'form.'.&Apache::edit::html_element_name('xfinal')} ne '') && ($env{'form.'.&Apache::edit::html_element_name('xfinallabel')} eq 'end')) {
1.53      www       739:        $env{'form.'.&Apache::edit::html_element_name('xfinallabel')}='';
                    740:     }
1.29      www       741:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.35      www       742:                                                  $safeeval,'index','derivativeorder',
                    743:                                                            'xinitial','xinitiallabel','xfinal','xfinallabel',
                    744:                                                            'minimumlength','maximumlength',
                    745:                                                            'relationship','value','percenterror');
1.29      www       746:     if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
1.13      www       747:    }
1.12      www       748:    return $result;
                    749: }
                    750: 
1.25      www       751: sub end_functionplotrule {
1.13      www       752:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    753:    my $result='';
                    754:    if ($target eq 'edit') {
                    755:        $result=&Apache::edit::end_table();
                    756:    }
                    757:    return $result;
1.12      www       758: }
                    759: 
                    760: 
                    761: #
1.23      www       762: # <spline index="..." order="1,2,3,4" initx="..." inity="..." scalex="..." scaley="..." />
1.6       www       763: #
                    764: # Unfortunately, GeoGebra seems to want all splines after everything else, so we need to store them
                    765: #
                    766: sub start_spline {
                    767:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1.13      www       768:    my $result='';
                    769:    if ($target eq 'web') {
1.23      www       770:       my $label=&Apache::lonxml::get_param('index',$parstack,$safeeval);
1.13      www       771:       $Apache::functionplotresponse::counter++;
                    772:       if ($label=~/\W/) {
1.23      www       773:          &Apache::lonxml::warning(&mt('Spline indices should only contain alphanumeric characters.'));
1.13      www       774:       }
                    775:       $label=~s/\W//gs;
1.23      www       776:       unless ($label) { 
                    777:          $label='S'.$Apache::functionplotresponse::counter; 
                    778:       } else {
                    779:          $label='S'.$label;
                    780:       }
1.13      www       781:       if ($Apache::functionplotresponse::splineorder{$label}) {
1.23      www       782:          &Apache::lonxml::error(&mt('Spline indices must be unique.'));
1.13      www       783:       }
                    784: 
                    785:       my $order=&Apache::lonxml::get_param('order',$parstack,$safeeval);
                    786:       if ($order<2) { $order=2; }
                    787:       if ($order>8) { $order=8; }
                    788:       $Apache::functionplotresponse::splineorder{$label}=$order;
                    789: 
                    790:       my $x=&Apache::lonxml::get_param('initx',$parstack,$safeeval);
                    791:       unless ($x) { $x=0; }
                    792:       $Apache::functionplotresponse::splineinitx{$label}=$x;
                    793: 
                    794:       my $y=&Apache::lonxml::get_param('inity',$parstack,$safeeval);
                    795:       unless ($y) { $y=0; }
                    796:       $Apache::functionplotresponse::splineinity{$label}=$y;
                    797: 
                    798:       my $sx=&Apache::lonxml::get_param('scalex',$parstack,$safeeval);
                    799:       unless ($sx) { $sx=$order; }
                    800:       $Apache::functionplotresponse::splinescalex{$label}=$sx;
                    801: 
                    802:       my $sy=&Apache::lonxml::get_param('scaley',$parstack,$safeeval);
                    803:       unless ($sy) { $sy=2; }
                    804:       $Apache::functionplotresponse::splinescaley{$label}=$sy;
                    805:    } elsif ($target eq 'edit') {
                    806:         $result=&Apache::edit::tag_start($target,$token,'Spline').
1.23      www       807:              &Apache::edit::text_arg('Index:','index',
1.14      www       808:                                      $token,'4').'&nbsp;'.
1.13      www       809:              &Apache::edit::select_arg('Order:','order',
1.44      www       810:                                   ['2','3','4','5','6','7','8'],$token).'&nbsp;'.
1.13      www       811:              &Apache::edit::text_arg('Initial x-value:','initx',
1.14      www       812:                                      $token,'4').'&nbsp;'.
1.13      www       813:              &Apache::edit::text_arg('Initial y-value:','inity',
1.14      www       814:                                      $token,'4').'&nbsp;'.
1.13      www       815:              &Apache::edit::text_arg('Scale x:','scalex',
1.14      www       816:                                      $token,'4').'&nbsp;'.
1.13      www       817:              &Apache::edit::text_arg('Scale y:','scaley',
                    818:                                      $token,'4').
                    819:              &Apache::edit::end_row();
                    820:   } elsif ($target eq 'modified') {
                    821:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.23      www       822:                                                  $safeeval,'index','order','initx','inity',
1.13      www       823:                                                            'scalex','scaley');
                    824:     if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
                    825:   }
                    826:   return $result;
1.6       www       827: }
                    828: 
                    829: sub end_spline {
1.13      www       830:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    831:    my $result='';
                    832:    if ($target eq 'edit') {
                    833:        $result=&Apache::edit::end_table();
                    834:    }
                    835:    return $result;
1.4       www       836: }
                    837:  
1.3       www       838: sub end_init_script {
                    839:     return (<<ENDENDINIT);
                    840: }
                    841: // ]]>
                    842: </script>
                    843: ENDENDINIT
                    844: }
                    845: 
1.10      www       846: #
                    847: # Storing and restoring spline coordinates from part answers
                    848: #
                    849: sub decode_previous_answer {
                    850:    my ($answer)=@_;
                    851:    foreach my $coordinate (split(/\,/,$answer)) {
                    852:       my ($key,$value)=split(/\=/,$coordinate);
                    853:       $Apache::functionplotresponse::previous{$key}=$value;
                    854:    }
                    855: }
                    856: 
                    857: sub get_answer_from_form_fields {
                    858:    my ($id)=@_;
                    859:    my $answer='';
                    860:    my %coords=();
                    861:    foreach my $field (keys(%env)) {
                    862:       if ($field=~/^form\.HWVAL\_$id/) {
                    863:          $field=~/^form\.(.*)$/;
                    864:          $coords{$1}=$env{$field};
                    865:       }
                    866:    }
                    867:    $answer=join(',',map { $_.'='.$coords{$_} } (sort(keys(%coords))));
                    868:    return ($answer,%coords);
                    869: }
                    870: 
1.15      www       871: #
                    872: # The following functions calculate the cubic-hermite splines server-side
                    873: #
                    874: 
                    875: sub cubic_hermite {
                    876:    my ($t,$p1,$s1,$p2,$s2)=@_;
1.42      www       877:    return (2.*$t*$t*$t-3.*$t*$t+1.)*$p1 + 3.*($t*$t*$t-2.*$t*$t+$t)*($s1-$p1)+
                    878:           (-2.*$t*$t*$t+3.*$t*$t)  *$p2 + 3.*($t*$t*$t-$t*$t)      *($s2-$p2);
1.15      www       879: }
                    880: 
                    881: #
                    882: # d/dt(...)
                    883: # 
                    884: 
                    885: sub ddt_cubic_hermite {
                    886:    my ($t,$p1,$s1,$p2,$s2)=@_;
1.42      www       887:    return (6.*$t*$t-6.*$t) *$p1 + 3.*(3.*$t*$t-4.*$t+1.)*($s1-$p1)+
                    888:           (-6.*$t*$t+6.*$t)*$p2 + 3.*(3.*$t*$t-2.*$t)   *($s2-$p2);
1.15      www       889: }
                    890: 
                    891: #
                    892: # d^2/dt^2(...)
                    893: #
                    894: 
                    895: sub d2dt2_cubic_hermite {
                    896:    my ($t,$p1,$s1,$p2,$s2)=@_;
1.42      www       897:    return (12.*$t-6.) *$p1 + 3.*(6.*$t-4.)*($s1-$p1)+
                    898:           (-12.*$t+6.)*$p2 + 3.*(6.*$t-2.)*($s2-$p2);
1.15      www       899: }
                    900: 
                    901: #
1.18      www       902: # Array index calculation
                    903: #
                    904: sub array_index {
                    905:    my ($xmin,$xmax,$x)=@_;
1.38      www       906:    if ($x ne '') {
                    907:       return int(($x-$xmin)/($xmax-$xmin)*400.+0.5);
                    908:    } else {
                    909:       return undef;
                    910:    }
1.20      www       911: }
                    912: 
                    913: #
1.18      www       914: # Populate the arrays
                    915: #
                    916: 
                    917: sub populate_arrays {
1.64      www       918:     my ($id,$xmin,$xmax,$ymin,$ymax)=@_;
1.26      www       919:     for (my $i=0; $i<=400; $i++) {
1.35      www       920:        $Apache::functionplotresponse::actualxval[$i]=undef;
1.19      www       921:        $Apache::functionplotresponse::func[$i]=undef;
1.22      www       922:        $Apache::functionplotresponse::dfuncdx[$i]=undef;
1.19      www       923:        $Apache::functionplotresponse::d2funcd2x[$i]=undef;
1.18      www       924:     }
1.19      www       925:     unless ($xmax>$xmin) { return 'no_func'; }
1.18      www       926: # Run over all splines in response
                    927:     foreach my $label (split(/\,/,$env{"form.HWVAL_AllSplines_$id"})) {
1.19      www       928:         my $xiold=-1;
1.18      www       929: # Run over all points in spline
1.19      www       930:         for (my $i=1; $i<$env{"form.HWVAL_SplineOrder_".$id."_".$label}; $i++) {
1.18      www       931:             my $ni=$i+1;
                    932:             my @xparms=($env{'form.HWVAL_'.$id.'_'.$label.'P'.$i.'_x'},
                    933:                         $env{'form.HWVAL_'.$id.'_'.$label.'S'.$i.'_x'},
                    934:                         $env{'form.HWVAL_'.$id.'_'.$label.'P'.$ni.'_x'},
                    935:                         $env{'form.HWVAL_'.$id.'_'.$label.'S'.$ni.'_x'});
                    936:             my @yparms=($env{'form.HWVAL_'.$id.'_'.$label.'P'.$i.'_y'},
                    937:                         $env{'form.HWVAL_'.$id.'_'.$label.'S'.$i.'_y'},
                    938:                         $env{'form.HWVAL_'.$id.'_'.$label.'P'.$ni.'_y'},
                    939:                         $env{'form.HWVAL_'.$id.'_'.$label.'S'.$ni.'_y'});
                    940: # Run in small steps over spline parameter
1.26      www       941:             for (my $t=0; $t<=1; $t+=0.0001) {
1.35      www       942:                 my $xreal=&cubic_hermite($t,@xparms);
                    943:                 my $xi=&array_index($xmin,$xmax,$xreal);
1.19      www       944:                 if ($xi<$xiold) { return 'no_func'; }
1.26      www       945:                 if (($xi>$xiold) && ($xi>=0) && ($xi<=400)) {
1.18      www       946:                    $xiold=$xi;
1.35      www       947:                    $Apache::functionplotresponse::actualxval[$xi]=$xreal;
1.22      www       948: # Function value
1.30      www       949:                    my $funcval=&cubic_hermite($t,@yparms);
1.64      www       950: 
                    951: # Do we already have a value for this point, and is it different from the new one?
                    952:                    if ((defined($Apache::functionplotresponse::func[$xi])) &&
                    953:                        (abs($Apache::functionplotresponse::func[$xi]-$funcval)>($ymax-$ymin)/100.)) { 
                    954:                        return 'no_func'; 
                    955:                    }
                    956: # Okay, remember the new point
1.30      www       957:                    $Apache::functionplotresponse::func[$xi]=$funcval;
1.64      www       958: 
1.30      www       959:                    if (defined($funcval)) {
                    960:                       if ($xi<$Apache::functionplotresponse::functionplotrulelabels{'start'}) {
                    961:                          $Apache::functionplotresponse::functionplotrulelabels{'start'}=$xi;
                    962:                       }
                    963:                       if ($xi>$Apache::functionplotresponse::functionplotrulelabels{'end'}) {
                    964:                          $Apache::functionplotresponse::functionplotrulelabels{'end'}=$xi;
                    965:                       }
                    966:                    }
1.28      www       967: # Chain rule
1.22      www       968: # dy/dx=dy/dt/(dx/dt)
                    969:                    my $dxdt=&ddt_cubic_hermite($t,@xparms);
                    970:                    if ($dxdt) {
                    971:                       $Apache::functionplotresponse::dfuncdx[$xi]=&ddt_cubic_hermite($t,@yparms)/$dxdt;
1.34      www       972: # Second derivative
1.28      www       973:                       $Apache::functionplotresponse::d2funcdx2[$xi]=
1.34      www       974:                          ($dxdt*&d2dt2_cubic_hermite($t,@yparms)-&ddt_cubic_hermite($t,@yparms)*&d2dt2_cubic_hermite($t,@xparms))/
                    975:                          ($dxdt*$dxdt*$dxdt);
1.22      www       976:                    }
1.18      www       977:                 }
                    978:             }
                    979:         }
                    980:     }
                    981: }
                    982: 
                    983: #
1.37      www       984: # Implementation of <functionplotresponse>
1.15      www       985: #
                    986: 
1.1       www       987: sub start_functionplotresponse {
                    988:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    989:   my $result='';
1.6       www       990: # To remember the splines - somehow, they need to come last
                    991:   undef %Apache::functionplotresponse::splineorder;
                    992:   undef %Apache::functionplotresponse::splineinitx;
                    993:   undef %Apache::functionplotresponse::splineinity;
                    994:   undef %Apache::functionplotresponse::splinescalex;
                    995:   undef %Apache::functionplotresponse::splinescaley;
1.10      www       996: # Remember input fields, etc
                    997:   undef %Apache::functionplotresponse::previous;
1.9       www       998:   $Apache::functionplotresponse::inputfields='';
1.6       www       999:   $Apache::functionplotresponse::counter=0;
1.24      www      1000: # Remember rules
1.25      www      1001:   undef @Apache::functionplotresponse::functionplotrules;
1.37      www      1002: # Remember failed rules
                   1003:   if ($target eq 'grade') {
                   1004:      undef @Apache::functionplotresponse::failedrules;
                   1005:   }
                   1006: # Delete previous awards
                   1007:   undef $Apache::functionplotresponse::awarddetail;
1.10      www      1008: # Part and ID
                   1009:   my $partid=$Apache::inputtags::part;
                   1010:   my $id=&Apache::response::start_response($parstack,$safeeval);
1.6       www      1011: # Internal ID to mark the applet and its coordinates
1.10      www      1012:   my $internalid = $partid.'_'.$id;
                   1013: # Previous answer
                   1014:   &decode_previous_answer($Apache::lonhomework::history{"resource.$partid.$id.submission"});
                   1015: 
1.6       www      1016: # Parameters of <functionplotresponse>
1.41      www      1017:   my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval);
1.6       www      1018:   my $xaxisvisible=(&Apache::lonxml::get_param('xaxisvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
                   1019:   my $yaxisvisible=(&Apache::lonxml::get_param('yaxisvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
                   1020:   my $gridvisible=(&Apache::lonxml::get_param('gridvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
1.14      www      1021:   my $xlabel=&Apache::lonxml::get_param('xlabel',$parstack,$safeeval);
                   1022:   my $ylabel=&Apache::lonxml::get_param('ylabel',$parstack,$safeeval);
1.12      www      1023:   if ($target eq 'edit') {
                   1024:     $result.=&Apache::edit::start_table($token)
                   1025:        .'<tr><td><span class="LC_nobreak">'.&mt('Function Plot Question').'</span></td>'
                   1026:        .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
1.37      www      1027:        .&Apache::edit::deletelist($target,$token).'&nbsp;&nbsp;&nbsp;'
1.50      www      1028:        .&Apache::edit::insertlist($target,$token).'&nbsp;&nbsp;&nbsp;'
                   1029:        .&Apache::loncommon::help_open_topic('Function_Plot_Response_Question','Function Plot Responses')
1.12      www      1030:        .'</span></td>'
                   1031:        ."<td>&nbsp;"
                   1032:        .&Apache::edit::end_row()
                   1033:        .&Apache::edit::start_spanning_row()
                   1034:        ."\n";
1.14      www      1035:     $result.=&Apache::edit::text_arg('Label x-axis:','xlabel',
                   1036:                                      $token,'6').'&nbsp;'.
                   1037:              &Apache::edit::text_arg('Minimum x-value:','xmin',
                   1038:                                      $token,'4').'&nbsp;'.
1.12      www      1039:              &Apache::edit::text_arg('Maximum x-value:','xmax',
1.14      www      1040:                                      $token,'4').'&nbsp;'.
1.12      www      1041:              &Apache::edit::select_arg('x-axis visible:','xaxisvisible',
1.32      www      1042:                                   ['yes','no'],$token).'<br />'.
1.14      www      1043:              &Apache::edit::text_arg('Label y-axis:','ylabel',
                   1044:                                      $token,'6').'&nbsp;'.
1.12      www      1045:              &Apache::edit::text_arg('Minimum y-value:','ymin',
1.14      www      1046:                                      $token,'4').'&nbsp;'.
1.12      www      1047:              &Apache::edit::text_arg('Maximum y-value:','ymax',
1.14      www      1048:                                      $token,'4').'&nbsp;'.
1.12      www      1049:              &Apache::edit::select_arg('y-axis visible:','yaxisvisible',
1.32      www      1050:                                   ['yes','no'],$token).'<br />'.
1.12      www      1051:              &Apache::edit::select_arg('Grid visible:','gridvisible',
1.47      www      1052:                                   ['yes','no'],$token).'<br />'.
1.58      www      1053:              &Apache::edit::text_arg('Background plot(s) for answer (function(x):xmin:xmax,function(x):xmin:xmax,x1:y1:sx1:sy1:x2:y2:sx2:sy2,...):',
1.63      raeburn  1054:                                          'answerdisplay',$token,'50').
1.12      www      1055:              &Apache::edit::end_row().&Apache::edit::start_spanning_row();
                   1056:   } elsif ($target eq 'modified') {
                   1057:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.14      www      1058:                                                  $safeeval,'xlabel','xmin','xmax','ylabel','ymin','ymax',
1.47      www      1059:                                                            'xaxisvisible','yaxisvisible','gridvisible','answerdisplay');
1.12      www      1060:     if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.3       www      1061: 
1.12      www      1062:   } elsif ($target eq 'meta') {
1.10      www      1063:        $result=&Apache::response::meta_package_write('functionplotresponse');
1.35      www      1064:   } elsif (($target eq 'answer') &&
                   1065:             ($env{'form.answer_output_mode'} ne 'tex') &&
                   1066:             ($Apache::lonhomework::viewgrades == 'F')) {
                   1067:       my (undef,undef,$udom,$uname)=&Apache::lonnet::whichuser();
                   1068:       my $windowopen=&Apache::lonhtmlcommon::javascript_docopen();
                   1069:       my $start_page = &Apache::loncommon::start_page('Rules Log', undef,
                   1070:                                                {'only_body' => 1,
                   1071:                                                 'bgcolor'   => '#FFFFFF',
                   1072:                                                 'js_ready'  => 1,});
                   1073:       my $end_page = &Apache::loncommon::end_page({'js_ready' => 1,});
                   1074:       $uname =~s/\W//g;
                   1075:       $udom  =~s/\W//g;
                   1076:       my $function_name =
                   1077:                 join('_','LONCAPA_scriptvars',$uname,$udom,
                   1078:                      $env{'form.counter'},$Apache::lonxml::curdepth);
                   1079:       my $rules_var ="<script type=\"text/javascript\">
                   1080: // <![CDATA[
                   1081:     function $function_name() {newWindow=open('','new_W','width=500,height=500,scrollbars=1,resizable=yes');newWindow.$windowopen;newWindow.document.writeln('$start_page<pre>".
                   1082:     $Apache::functionplotresponse::ruleslog.
                   1083:     "<\\/pre>$end_page');newWindow.document.close();newWindow.focus()}
                   1084: // ]]>
                   1085: </script><a href=\"javascript:$function_name();void(0);\">".&mt('Rules Log')."</a><br />";
                   1086:             &Apache::lonxml::add_script_result($rules_var);
                   1087:         }
                   1088: 
1.1       www      1089:   return $result;
                   1090: }
                   1091: 
1.25      www      1092: sub compare_rel {
1.26      www      1093:    my ($relationship,$value,$realval,$tol)=@_;
1.36      www      1094: # is the real value undefined?
1.26      www      1095:    unless (defined($realval)) {
1.36      www      1096: # the real value is not defined
1.26      www      1097:       if ($relationship eq 'eq') {
                   1098:          if ($value eq 'undef') {
                   1099:             return 1;
                   1100:          } else {
                   1101:             return 0;
                   1102:          }
                   1103:       } elsif ($relationship eq 'ne') {
                   1104:          if ($value eq 'undef') {
                   1105:             return 0;
                   1106:          } else {
                   1107:             return 1;
                   1108:          }
                   1109:       } else {
                   1110:          return 0;
                   1111:       }
                   1112:    }
                   1113: 
1.36      www      1114: # is the expected value undefined?
                   1115:    if ($value eq 'undef') {
                   1116: # but by now we know that the real value is defined
                   1117:       return 0;
                   1118:    }
                   1119: 
                   1120: # both are defined.
1.26      www      1121:    if ($relationship eq 'gt') {
                   1122:       return ($realval>$value);
                   1123:    } elsif ($relationship eq 'ge') {
                   1124:       return ($realval>$value-$tol);
                   1125:    } elsif ($relationship eq 'lt') {
                   1126:       return ($realval<$value);
                   1127:    } elsif ($relationship eq 'le') {
                   1128:       return ($realval<$value+$tol);
                   1129:    } elsif ($relationship eq 'ne') {
                   1130:       return (abs($value-$realval)>$tol);
                   1131:    } else {
                   1132:       return (abs($value-$realval)<$tol);
                   1133:    }
1.25      www      1134:    return 0;
                   1135: }
                   1136: 
1.35      www      1137: sub addlog {
                   1138:    my ($text)=@_;
1.67      www      1139:    $text=~s/\'/\\\'/g;
1.35      www      1140:    $Apache::functionplotresponse::ruleslog.=$text.'<br />';
                   1141: }
                   1142: 
                   1143: sub actualval {
                   1144:    my ($i,$xmin,$xmax)=@_;
                   1145:    return $xmin+$i/400.*($xmax-$xmin);
                   1146: }
1.65      www      1147: 
1.66      www      1148: sub fpr_val {
                   1149:    my ($arg)=@_;
                   1150:    return &actualval($Apache::functionplotresponse::functionplotrulelabels{$arg},
                   1151:                      $Apache::functionplotresponse::fpr_xmin,
                   1152:                      $Apache::functionplotresponse::fpr_xmax);
                   1153: }
                   1154: 
1.65      www      1155: sub fpr_f {
                   1156:    my ($arg)=@_;
                   1157:    return $Apache::functionplotresponse::func[&array_index($Apache::functionplotresponse::fpr_xmin,
                   1158:                                                            $Apache::functionplotresponse::fpr_xmax,
                   1159:                                                            $arg)];
                   1160: }
                   1161: 
                   1162: sub fpr_dfdx {
                   1163:    my ($arg)=@_;
                   1164:    return $Apache::functionplotresponse::dfuncdx[&array_index($Apache::functionplotresponse::fpr_xmin,
                   1165:                                                               $Apache::functionplotresponse::fpr_xmax,
                   1166:                                                               $arg)];
                   1167: }
                   1168: 
                   1169: sub fpr_d2fdx2 {
                   1170:    my ($arg)=@_;
                   1171:    return $Apache::functionplotresponse::d2funcdx2[&array_index($Apache::functionplotresponse::fpr_xmin,
                   1172:                                                                 $Apache::functionplotresponse::fpr_xmax,
                   1173:                                                                 $arg)];
                   1174: }
1.35      www      1175:  
1.25      www      1176: sub functionplotrulecheck {
1.65      www      1177:    my ($rule,$xmin,$xmax,$ymin,$ymax,$safeeval)=@_;
1.33      www      1178: 
1.35      www      1179:    my ($label,$derivative,$xinitial,$xinitiallabel,$xfinal,$xfinallabel,$minimumlength,$maximumlength,$relationship,$value,$percent)
1.25      www      1180:       =split(/\:/,$rule);
1.33      www      1181:    $percent=($percent>0?$percent:5);
1.35      www      1182:    &addlog("=================");
1.42      www      1183:    &addlog("Rule $label for ".($derivative<0?'integral':('function itself','first derivative','second derivative')[$derivative])." $relationship $value");
1.65      www      1184: #
                   1185: # Evaluate the value
                   1186: #
                   1187:    if ($value=~/\D/) {
                   1188:       $Apache::functionplotresponse::fpr_xmin=$xmin;
                   1189:       $Apache::functionplotresponse::fpr_xmax=$xmax;
                   1190:       $value=&Apache::run::run($value,$safeeval);
                   1191:       &addlog("Value evaluated to $value");
                   1192:    }
                   1193: 
                   1194: #
                   1195: # Minimum and maximum lengths of the interval
                   1196: #
1.49      www      1197:    if ((defined($minimumlength)) || (defined($maximumlength))) {
                   1198:       &addlog("Minimumlength $minimumlength Maximumlength $maximumlength");
                   1199:    }
1.30      www      1200:    my $li=0;
                   1201:    my $lh=400;
                   1202: 
1.31      www      1203: # Special case: the upper boundary was not defined
                   1204: # and needs to be set to the value where
                   1205: # the condition is not true anymore => set flag
                   1206: 
                   1207:    my $findupper=0;
                   1208:    if (($xfinal eq '')
                   1209:     && (!defined($Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}))
                   1210:     && ($xfinallabel)) {
                   1211:        $findupper=1;
                   1212:    }
                   1213: 
1.25      www      1214: # if a hard value is set for the boundaries, it overrides the label
1.30      www      1215:    if (($xinitial ne '') && ($xinitiallabel ne '') && ($xinitiallabel ne 'start')) {
                   1216:       $li=&array_index($xmin,$xmax,$xinitial);
                   1217:       $Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel}=$li;
                   1218:    }
                   1219:    if (($xfinal ne '') && ($xfinallabel ne '') && ($xfinallabel ne 'end')) {
                   1220:       $lh=&array_index($xmin,$xmax,$xfinal);
                   1221:       $Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}=$lh;
1.25      www      1222:    }
1.31      www      1223: # if the label is defined, use it
1.25      www      1224:    if (defined($Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel})) {
1.35      www      1225:       &addlog("Using lower label $xinitiallabel");
1.30      www      1226:       $li=$Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel};
                   1227:    } else {
                   1228:       $li=&array_index($xmin,$xmax,$xinitial);
1.25      www      1229:    }
1.31      www      1230:    unless ($findupper) {
                   1231:       if (defined($Apache::functionplotresponse::functionplotrulelabels{$xfinallabel})) {
1.35      www      1232:          &addlog("Using upper label $xfinallabel");
1.33      www      1233:          $lh=$Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}-1;
1.31      www      1234:       } else {
                   1235:          $lh=&array_index($xmin,$xmax,$xfinal);
                   1236:       }
1.25      www      1237:    }
                   1238: # Basic sanity checks
1.30      www      1239:    if ($li<0) { $li=0; }
                   1240:    if ($lh>400) { $lh=400; }
1.38      www      1241:    if (($li>$lh) || (!defined($lh))) {
1.30      www      1242:        $lh=$li;
1.25      www      1243:    }
1.31      www      1244: 
1.35      www      1245:    &addlog("Boundaries: x=".&actualval($li,$xmin,$xmax)." (".$Apache::functionplotresponse::actualxval[$li]."; index $li)) to x=".
                   1246:                             &actualval($lh,$xmin,$xmax)." (".$Apache::functionplotresponse::actualxval[$lh]."; index $lh))");
                   1247:    if ($findupper) {
                   1248:       &addlog("Looking for label $xfinallabel");
                   1249:    }
1.33      www      1250:    my $tol=$percent*($ymax-$ymin)/100;
                   1251:    if ($xmax>$xmin) {
                   1252:       if ($derivative==2) {
                   1253:          $tol=4.*$tol/($xmax-$xmin);
                   1254:       } elsif ($derivative==1) {
                   1255:          $tol=2.*$tol/($xmax-$xmin);
1.42      www      1256:       } elsif ($derivative==-1) {
                   1257:          $tol=$tol*($xmax-$xmin)/2.;
1.33      www      1258:       }
1.27      www      1259:    }
1.42      www      1260:    my $integral=0;
                   1261:    my $binwidth=($xmax-$xmin)/400.;
                   1262:    if (($derivative<0) && (!$findupper)) {
                   1263: # definite integral, calculate over whole length
                   1264:      &addlog("Calculating definite integral");
                   1265:      for (my $i=$li; $i<=$lh; $i++) {
                   1266:         $integral+=$Apache::functionplotresponse::func[$i]*$binwidth;
                   1267:      }
                   1268:      unless (&compare_rel($relationship,$value,$integral,$tol)) {
                   1269:         &addlog("Actual integral ".(defined($integral)?$integral:'undef').", expected $value, tolerance $tol");
                   1270:         &addlog("Rule $label failed.");
                   1271:         my $hintlabel=$label;
                   1272:         $hintlabel=~s/^R//;
                   1273:         push(@Apache::functionplotresponse::failedrules,$hintlabel);
                   1274:         &addlog("Set hint condition $hintlabel");
                   1275:         return 0;
                   1276:      } 
                   1277:    } else {
                   1278:      for (my $i=$li; $i<=$lh; $i++) {
1.25      www      1279:         my $val;
                   1280:         if ($derivative==2) {
1.27      www      1281:            $val=$Apache::functionplotresponse::d2funcdx2[$i];
1.25      www      1282:         } elsif ($derivative==1) {
1.27      www      1283:            $val=$Apache::functionplotresponse::dfuncdx[$i];
1.42      www      1284:         } elsif ($derivative==-1) {
                   1285:            $integral+=$Apache::functionplotresponse::func[$i]*$binwidth;
                   1286:            $val=$integral;      
1.25      www      1287:         } else {
1.27      www      1288:            $val=$Apache::functionplotresponse::func[$i];
1.25      www      1289:         }
1.31      www      1290:         unless (&compare_rel($relationship,$value,$val,$tol)) { 
1.37      www      1291:            &addlog("Actual value ".(defined($val)?$val:'undef').", expected $value, tolerance $tol");
1.35      www      1292:            &addlog("Condition not fulfilled at x=".&actualval($i,$xmin,$xmax)." (".$Apache::functionplotresponse::actualxval[$i]."; index $i)");
1.31      www      1293:            if (($findupper) && ($i>$li)) {
1.49      www      1294: # Check lengths
                   1295:               unless (&checklength($i,$li,$minimumlength,$maximumlength,$xmin,$xmax,$label)) { return 0; }
                   1296: # Successfully found a new label, set it
1.31      www      1297:               $Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}=$i;
1.35      www      1298:               &addlog("Rule $label passed, setting label $xfinallabel");
1.31      www      1299:               return 1;
                   1300:            } else {
1.35      www      1301:               &addlog("Rule $label failed.");
1.49      www      1302:               &setfailed($label);
1.31      www      1303:               return 0; 
                   1304:            }
                   1305:         }
1.42      www      1306:      }
1.25      www      1307:    }
1.49      www      1308: # Corner case where this makes sense: using start or stop as defined labels
                   1309:    unless (&checklength($lh,$li,$minimumlength,$maximumlength,$xmin,$xmax,$label)) { return 0; }
1.35      www      1310:    &addlog("Rule $label passed.");
1.27      www      1311:    return 1;
1.24      www      1312: }
                   1313: 
1.49      www      1314: #
                   1315: # check for minimum and maximum lengths
                   1316: #
                   1317: 
                   1318: sub checklength {
                   1319:     my ($i,$li,$minimumlength,$maximumlength,$xmin,$xmax,$label)=@_;
                   1320:     unless (($minimumlength) || ($maximumlength)) { return 1; }
                   1321:     my $length=&actualval($i,$xmin,$xmax)-&actualval($li,$xmin,$xmax);
                   1322:     if ($minimumlength) {
                   1323:        if ($length<$minimumlength) {
                   1324:           &addlog("Rule $label failed, actual length $length, minimum length $minimumlength");
                   1325:           &setfailed($label);
                   1326:           return 0;
                   1327:        }
                   1328:     }
                   1329:     if ($maximumlength) {
                   1330:        if ($length>$maximumlength) {
                   1331:           &addlog("Rule $label failed, actual length $length, maximum length $maximumlength");
                   1332:           &setfailed($label);
                   1333:           return 0;
                   1334:        }
                   1335:     }
                   1336:     return 1;
                   1337: }
                   1338: 
                   1339: sub setfailed {
                   1340:    my ($label)=@_;
                   1341:    my $hintlabel=$label;
                   1342:    $hintlabel=~s/^R//;
                   1343:    push(@Apache::functionplotresponse::failedrules,$hintlabel);
                   1344:    &addlog("Set hint condition $hintlabel");
                   1345: }
                   1346: 
1.37      www      1347: sub start_functionplotruleset {
                   1348:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1349:    if ($target eq 'edit') {
                   1350:       return &Apache::edit::start_table($token).
                   1351:         '<tr><td><span class="LC_nobreak">'.&mt('Function Plot Rule Set').'</span></td>'
                   1352:        .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
                   1353:        .&Apache::edit::deletelist($target,$token).'&nbsp;&nbsp;&nbsp;'.
1.50      www      1354:         &Apache::edit::insertlist($target,$token).'&nbsp;&nbsp;&nbsp;'
                   1355:        .&Apache::loncommon::help_open_topic('Function_Plot_Response_Rule_Set','Function Plot Rules')
1.37      www      1356:        .'</span></td>'
                   1357:        ."<td>&nbsp;"
                   1358:        .&Apache::edit::end_row()
                   1359:        .&Apache::edit::start_spanning_row()
                   1360:        ."\n";
                   1361:    }
                   1362: }
1.3       www      1363: 
1.37      www      1364: sub end_functionplotruleset {
                   1365:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1366:     my $id=$Apache::inputtags::response[-1];
                   1367:     my $partid=$Apache::inputtags::part;
                   1368:     my $internalid = $partid.'_'.$id;
                   1369: 
                   1370:     if ($target eq 'edit' ) {
                   1371:         return &Apache::edit::end_table();
                   1372:     }  elsif ($target eq 'grade'
1.10      www      1373:          && &Apache::response::submitted()
                   1374:          && $Apache::lonhomework::type ne 'exam') {
1.12      www      1375: #
                   1376: # Actually grade
                   1377: #
1.41      www      1378:     my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval,-2);
1.27      www      1379: 
1.24      www      1380:         my $ad='';
1.30      www      1381:         undef  %Apache::functionplotresponse::functionplotrulelabels;
1.35      www      1382:         $Apache::functionplotresponse::ruleslog='';
1.30      www      1383:         $Apache::functionplotresponse::functionplotrulelabels{'start'}=400;
                   1384:         $Apache::functionplotresponse::functionplotrulelabels{'end'}=0;
1.64      www      1385:         if (&populate_arrays($internalid,$xmin,$xmax,$ymin,$ymax) eq 'no_func') {
1.21      www      1386:            $ad='NOT_FUNCTION';
1.18      www      1387:         } else {
1.35      www      1388:            &addlog("Start of function ".&actualval($Apache::functionplotresponse::functionplotrulelabels{'start'},$xmin,$xmax)." (index ".
                   1389:                                         $Apache::functionplotresponse::functionplotrulelabels{'start'}.")");
                   1390:            &addlog("End of function ".&actualval($Apache::functionplotresponse::functionplotrulelabels{'end'},$xmin,$xmax)." (index ".
                   1391:                                         $Apache::functionplotresponse::functionplotrulelabels{'end'}.")");
                   1392: 
1.24      www      1393: # We have a function that we can actually grade, go through the spline rules.
1.25      www      1394:            foreach my $rule (@Apache::functionplotresponse::functionplotrules) {
1.65      www      1395:               unless (&functionplotrulecheck($rule,$xmin,$xmax,$ymin,$ymax,$safeeval)) {
1.24      www      1396:                  $ad='INCORRECT';
                   1397:                  last;
                   1398:               }
                   1399:            }
                   1400: # If it's not wrong, it's correct 
                   1401:            unless ($ad) { $ad='EXACT_ANS' };
1.18      www      1402:         }
1.37      www      1403:         &addlog("Set hint conditions: ".join(",",@Apache::functionplotresponse::failedrules));
                   1404:         &addlog("Assigned award detail: $ad");
                   1405: # Store for later to be assigned at end_functionplotresponse
                   1406:         $Apache::functionplotresponse::awarddetail=$ad;
                   1407:      }
                   1408: }
                   1409: 
                   1410: 
                   1411: sub end_functionplotresponse {
                   1412:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1413:   &Apache::response::end_response;
                   1414: 
                   1415:   my $result;
                   1416:   my $id=$Apache::inputtags::response[-1];
                   1417:   my $partid=$Apache::inputtags::part;
                   1418:   my $internalid = $partid.'_'.$id;
1.20      www      1419: 
1.37      www      1420:     if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
                   1421:     if ($target eq 'grade'
                   1422:          && &Apache::response::submitted()
                   1423:          && $Apache::lonhomework::type eq 'exam') {
                   1424: 
                   1425:         &Apache::response::scored_response($partid,$id);
                   1426: 
                   1427:     } elsif ($target eq 'grade'
                   1428:          && &Apache::response::submitted()
                   1429:          && $Apache::lonhomework::type ne 'exam') {
                   1430:         my ($response,%coords)=&get_answer_from_form_fields($internalid);
                   1431:         $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
                   1432:         my %previous=&Apache::response::check_for_previous($response,$partid,$id);
                   1433: #
                   1434: # Assign grade
                   1435: #
                   1436:         my $ad=$Apache::functionplotresponse::awarddetail;
1.12      www      1437: #
                   1438: # Store grading info
                   1439: #
                   1440:         $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
                   1441:         &Apache::response::handle_previous(\%previous,$ad);
1.10      www      1442:    } elsif ($target eq 'web') {
1.37      www      1443:         undef @Apache::functionplotresponse::failedrules;
                   1444:    }
                   1445:    return $result;
                   1446: }
                   1447: 
                   1448: sub end_functionplotelements {
                   1449:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1450:   my $result='';
                   1451:   my $id=$Apache::inputtags::response[-1];
                   1452:   my $partid=$Apache::inputtags::part;
                   1453:   my $internalid = $partid.'_'.$id;
                   1454:   if ($target eq 'edit' ) {
                   1455:      $result=&Apache::edit::end_table();
                   1456:   } elsif ($target eq 'web') {
1.47      www      1457:      my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval,-2);
                   1458: 
                   1459: # Are we in show answer mode?
                   1460:      my $showanswer=&Apache::response::show_answer();
                   1461:      if ($showanswer) {
                   1462: # Render answerdisplay
                   1463:         my $answerdisplay=&Apache::lonxml::get_param('answerdisplay',$parstack,$safeeval,-2);
                   1464:         if ($answerdisplay=~/\S/s) {
                   1465:            foreach my $plot (split(/\s*\,\s*/,$answerdisplay)) {
1.58      www      1466:               my @components=split(/\s*\:\s*/,$plot);
                   1467:               if ($#components<3) {
                   1468: # Just a simple plot
                   1469:                  my ($func,$xl,$xh)=@components;
                   1470:                  if ((!defined($xl)) || ($xl eq '')) { $xl=$xmin; }
                   1471:                  if ((!defined($xh)) || ($xh eq '')) { $xh=$xmax; }
                   1472:                  $result.=&plot_script($internalid,$func,1,'','00aa00',$xl,$xh,6);
                   1473:               } else {
                   1474: # This is a spline
1.59      www      1475:                  $result.=&answer_spline_script($internalid,@components);
1.58      www      1476:               }
1.47      www      1477:            }
                   1478:         }
                   1479:      }
1.48      www      1480:      my $fixed=0;
                   1481:      if (($showanswer) || (&Apache::response::check_status()>=2)) { $fixed=1; }
1.6       www      1482: # Now is the time to render all of the stored splines
                   1483:      foreach my $label (keys(%Apache::functionplotresponse::splineorder)) {
1.48      www      1484:         $result.=&generate_spline($internalid,$label,$xmin,$xmax,$ymin,$ymax,$fixed);
1.6       www      1485:      }
1.5       www      1486: # close the init script
1.3       www      1487:      $result.=&end_init_script();
1.17      www      1488: # register all splines in this response 
                   1489:      $result.='<input type="hidden" name="HWVAL_AllSplines_'.$internalid.'" value="'.
                   1490:                  join(',',keys(%Apache::functionplotresponse::splineorder)).'" />'."\n";
                   1491:      foreach my $label (keys(%Apache::functionplotresponse::splineorder)) {
                   1492:         $result.='<input type="hidden" name="HWVAL_SplineOrder_'.$internalid.'_'.$label.'" value="'.
                   1493:                  $Apache::functionplotresponse::splineorder{$label}.'" />'."\n";
                   1494:      }
1.9       www      1495: # generate the input fields
                   1496:      $result.=$Apache::functionplotresponse::inputfields;
1.5       www      1497: # actually start the <applet>-tag
1.3       www      1498:      $result.=&geogebra_startcode($internalid);
1.5       www      1499: # load the spline bytecode
1.3       www      1500:      $result.=&geogebra_spline_program();
1.5       www      1501: # set default parameters
1.3       www      1502:      $result.=&geogebra_default_parameters($internalid);
1.5       www      1503: # close the <applet>-tag
1.1       www      1504:      $result.=&geogebra_endcode();
                   1505:   }
                   1506:   return $result;
                   1507: }
                   1508: 
1.41      www      1509: sub boundaries {
                   1510:    my ($parstack,$safeeval,$level)=@_;
                   1511:    my $xmin=&Apache::lonxml::get_param('xmin',$parstack,$safeeval,$level);
                   1512:    $xmin=(defined($xmin)?$xmin:-10);
                   1513:    my $xmax=&Apache::lonxml::get_param('xmax',$parstack,$safeeval,$level);
                   1514:    $xmax=(defined($xmax)?$xmax:10);
                   1515:    my $ymin=&Apache::lonxml::get_param('ymin',$parstack,$safeeval,$level);
                   1516:    $ymin=(defined($ymin)?$ymin:-10);
                   1517:    my $ymax=&Apache::lonxml::get_param('ymax',$parstack,$safeeval,$level);
                   1518:    $ymax=(defined($ymax)?$ymax:10);
                   1519:    if ($xmax<=$xmin) {
                   1520:       $xmax=$xmin+20;
                   1521:    }
                   1522:    if ($ymax<=$ymin) {
                   1523:       $ymax=$ymin+20;
                   1524:    }
                   1525:    return ($xmin,$xmax,$ymin,$ymax);
                   1526: }
                   1527: 
1.37      www      1528: sub start_functionplotelements {
                   1529:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1530:    my $result='';
                   1531:    my $id=$Apache::inputtags::response[-1];
                   1532:    my $partid=$Apache::inputtags::part;
                   1533:    my $internalid = $partid.'_'.$id;
                   1534: 
                   1535:    if ($target eq 'edit') {
                   1536:       return &Apache::edit::start_table($token).
                   1537:         '<tr><td><span class="LC_nobreak">'.&mt('Function Plot Elements').'</span></td>'
                   1538:        .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
                   1539:        .&Apache::edit::deletelist($target,$token).'&nbsp;&nbsp;&nbsp;'.
1.50      www      1540:         &Apache::edit::insertlist($target,$token).'&nbsp;&nbsp;&nbsp;'
                   1541:        .&Apache::loncommon::help_open_topic('Function_Plot_Response_Elements','Function Plot Elements')
1.37      www      1542:        .'</span></td>'
                   1543:        ."<td>&nbsp;"
                   1544:        .&Apache::edit::end_row()
                   1545:        .&Apache::edit::start_spanning_row()
                   1546:        ."\n";
                   1547:    } elsif ($target eq 'web') {
1.41      www      1548:       my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval,-2);
1.37      www      1549:       my $xaxisvisible=(&Apache::lonxml::get_param('xaxisvisible',$parstack,$safeeval,-2)=~/on|true|yes|1/i?'true':'false');
                   1550:       my $yaxisvisible=(&Apache::lonxml::get_param('yaxisvisible',$parstack,$safeeval,-2)=~/on|true|yes|1/i?'true':'false');
                   1551:       my $gridvisible=(&Apache::lonxml::get_param('gridvisible',$parstack,$safeeval,-2)=~/on|true|yes|1/i?'true':'false');
                   1552:       my $xlabel=&Apache::lonxml::get_param('xlabel',$parstack,$safeeval,-2);
                   1553:       my $ylabel=&Apache::lonxml::get_param('ylabel',$parstack,$safeeval,-2);
                   1554: 
                   1555: 
                   1556: # paste in the update routine to receive stuff back from the applet
                   1557:      $result.=&update_script($internalid);
                   1558: # start the initscript for this applet
                   1559:      $result.=&start_init_script($internalid);
                   1560: # put the axis commands inside
                   1561:      $result.=&axes_script($internalid,$xmin,$xmax,$ymin,$ymax,$xaxisvisible,$yaxisvisible,$gridvisible);
1.45      www      1562:      $result.=&axes_label($internalid,$xmin,$xmax,$ymin,$ymax,$xlabel,$ylabel);
1.37      www      1563: # init script is left open
                   1564:   }
                   1565:   return $result;
                   1566: }
                   1567: 
1.1       www      1568: 1;
                   1569: 
                   1570: __END__
                   1571:  
                   1572: =head1 NAME
                   1573: 
                   1574: Apache::functionplotresponse.pm;
                   1575: 
                   1576: =head1 SYNOPSIS
                   1577: 
                   1578: Handles tags associated with accepting function plots.
                   1579: 
                   1580: This is part of the LearningOnline Network with CAPA project
                   1581: described at http://www.lon-capa.org.
                   1582: 
                   1583: =head1 HANDLER SUBROUTINE
                   1584: 
                   1585: start_functionplotresponse()
                   1586: 
                   1587: =head1 OTHER SUBROUTINES
                   1588: 
                   1589: =over
                   1590: 
                   1591: =item end_functionplotresponse()
                   1592: 
                   1593: =back
                   1594: 
                   1595: =cut

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