Annotation of loncom/homework/functionplotresponse.pm, revision 1.68

1.1       www         1: # LearningOnline Network with CAPA
                      2: # option list style responses
                      3: #
1.68    ! www         4: # $Id: functionplotresponse.pm,v 1.67 2011/10/19 00:20:28 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',
                     38:                                                             'functionplotrule','functionplotruleset',
                     39:                                                             'functionplotelements'));
1.1       www        40: }
                     41: 
1.5       www        42: #
                     43: # There can be a number of applets on a page, each called ggbApplet_$id, 
                     44: # where $id is the "_"-concatenated part and responseid
                     45: #
                     46: 
1.1       www        47: sub geogebra_startcode {
1.3       www        48:     my ($id)=@_;
1.1       www        49:     return (<<ENDSTARTCODE);
1.3       www        50: <applet name="ggbApplet_$id" code="geogebra.GeoGebraApplet" archive="geogebra.jar"
1.40      www        51:          codebase="/adm/geogebra/"  width="722" height="447" MAYSCRIPT>
1.1       www        52:        <param name="java_arguments" value="-Xmx512m -Djnlp.packEnabled=true"/>
                     53: ENDSTARTCODE
                     54: }
                     55: 
                     56: sub geogebra_endcode {
1.2       www        57:     return &Apache::lonhtmlcommon::java_not_enabled()."</applet>\n";
                     58: }
                     59: 
1.5       www        60: #
                     61: # This is the internal GeoGebra bytecode which defines the spline functions
                     62: #
1.2       www        63: sub geogebra_spline_program {
                     64:     return (<<ENDSPLINEPROGRAM);
1.57      www        65: <param name="ggbBase64" value="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"/>
1.2       www        66: ENDSPLINEPROGRAM
                     67: }
                     68: 
1.5       www        69: #
                     70: # The standard set of parameters inside <applet>
                     71: #
1.2       www        72: sub geogebra_default_parameters {
1.3       www        73:    my ($id)=@_;
1.2       www        74:    return(<<ENDDEFAULTPARAMETERS);
                     75:         <param name="image" value="/adm/lonIcons/lonanim.gif"  />
                     76:         <param name="boxborder" value="false"  />
                     77:         <param name="centerimage" value="true"  />
1.62      www        78: 	<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" />
                     79: 	<param name="cache_version" value="3.9.219.0, 3.9.219.0, 3.9.219.0, 3.9.219.0, 3.9.219.0, 3.9.219.0, 3.9.219.0, 3.9.219.0, 3.9.219.0, 3.9.219.0, 3.9.219.0" />
1.2       www        80:         <param name="framePossible" value="false" />
                     81: 
                     82:         <param name="showResetIcon" value="false" />
                     83:         <param name="showAnimationButton" value="false" />
                     84:         <param name="enableRightClick" value="false" />
                     85:         <param name="errorDialogsActive" value="true" />
                     86:         <param name="enableLabelDrags" value="false" />
                     87:         <param name="showMenuBar" value="false" />
                     88:         <param name="showToolBar" value="false" />
                     89:         <param name="showToolBarHelp" value="false" />
                     90:         <param name="showAlgebraInput" value="false" />
                     91:         <param name="enableShiftDragZoom" value="false" />
                     92:         <param name="allowRescaling" value="false" />
                     93:         <param name="enableLabelDrags" value="false" />
1.3       www        94:         <param name="ggbOnInitParam" value="applet_$id" />
1.2       www        95: ENDDEFAULTPARAMETERS
1.1       www        96: }
                     97: 
1.5       www        98: #
                     99: # This subroutine is called by LON-CAPA at </problem>
                    100: # Each applet on the page will call function ggbOnInit when it is done loading
                    101: # This function in turn will call the respective function registered by start_init_script
                    102: # Which one of the registered functions is called is determined by ggbOnInitParam, which GeoGebra passes to ggbOnInit
                    103: #
                    104: 
1.3       www       105: sub init_script {
1.16      www       106:    if ($#Apache::functionplotresponse::callscripts>=0) {
                    107:       my $script='';
                    108:       foreach my $id (@Apache::functionplotresponse::callscripts) {
                    109:           $script.="if (param=='applet_$id') { loaded_$id=true; }\n";
                    110:       }
                    111:       $script.="if (".join(' && ',map { "loaded_$_" } (@Apache::functionplotresponse::callscripts)).
1.52      www       112:                ") { setTimeout('ggbInitAll()',200) }";
1.16      www       113:       my $calls=join("\n",map { "ggbInit_$_();" } (@Apache::functionplotresponse::callscripts)); 
1.3       www       114:       return (<<ENDGGBINIT);
                    115: <script type="text/javascript">
                    116: // <![CDATA[
1.16      www       117: // Function that each applet will call when loaded
                    118: // It will pass "its" parameter
                    119: // Set flags for when an applet is loaded, wait till all are loaded, and then some
1.3       www       120: function ggbOnInit(param) {
1.16      www       121: $script
                    122: }
                    123: function ggbInitAll() {
1.17      www       124: $calls
1.3       www       125: }
                    126: // ]]>
                    127: </script>
                    128: ENDGGBINIT
                    129:    }
                    130: }
                    131: 
1.5       www       132: #
                    133: # Each Geogebra applet is supposed to call this when parameters change
1.10      www       134: # Changes the hidden fields on the web page
1.5       www       135: #
                    136: sub update_script {
                    137:     my ($id)=@_;
                    138:     return (<<ENDUPDATESCRIPT);
                    139: <script type="text/javascript">
                    140: // <![CDATA[
                    141: function updatePointCoordinates_$id(coordinateName) {
                    142:             var x = document.ggbApplet_$id.getXcoord(coordinateName);
                    143:             var y = document.ggbApplet_$id.getYcoord(coordinateName);
1.9       www       144:             document.lonhomework.elements["HWVAL_$id\_" + coordinateName + "_x"].value = x;
                    145:             document.lonhomework.elements["HWVAL_$id\_" + coordinateName + "_y"].value = y;
1.5       www       146:         }
                    147: // ]]>
                    148: </script>
                    149: ENDUPDATESCRIPT
                    150: }
                    151: 
                    152: #
                    153: # Register the above update-handler for a variable
                    154: #
                    155: 
                    156: sub update_register {
                    157:    my ($id,$variable)=@_;
1.6       www       158:    return "document.ggbApplet_$id.registerObjectUpdateListener('$variable','updatePointCoordinates_$id');\n";
                    159: }
                    160: 
                    161: #
1.40      www       162: # Set a point coordinate variable
1.6       www       163: #
1.40      www       164: sub set_point_coordinate {
1.48      www       165:    my ($id,$variable,$x,$y,$fixed)=@_;
                    166:    my $mult=($fixed?'a*':'');
1.68    ! www       167: # Get rid of wild exponents, make sure it's a number
        !           168:    $x=1.*$x;
        !           169:    $y=1.*$y;
        !           170: # GeoGebra does not understand "E"
        !           171:    $x=~s/[e|E]/\*10\^/;
        !           172:    $x=~s/\+//;
        !           173:    $y=~s/[e|E]/\*10\^/;
        !           174:    $y=~s/\+//;
1.6       www       175:    return (<<ENDSETVARIABLE);
1.48      www       176: document.ggbApplet_$id.evalCommand("a=1");
                    177: document.ggbApplet_$id.evalCommand("$variable=$mult($x,$y)");
1.40      www       178: document.ggbApplet_$id.setLabelVisible("$variable",false);
1.6       www       179: ENDSETVARIABLE
                    180: }
                    181: 
                    182: #
1.40      www       183: # Set a slope coordinate variable
                    184: #
                    185: sub set_slope_coordinate {
1.48      www       186:    my ($id,$variable,$xrel,$yrel,$xmin,$xmax,$ymin,$ymax,$pointname,$fixed)=@_;
1.40      www       187:    my $xvariable=$variable.'x';
                    188:    my $yvariable=$variable.'y';
                    189:    my $domain=$xmax-$xmin;
                    190:    my $range=$ymax-$ymin;
                    191:    my $xinterval=$domain/100.;
                    192:    my $yinterval=$range/200.;
1.48      www       193:    my $mult=($fixed?'a*':'');
1.40      www       194:    return (<<ENDSETSVARIABLE);
1.48      www       195: document.ggbApplet_$id.evalCommand("a=1");
1.51      www       196: document.ggbApplet_$id.evalCommand("$xvariable=Slider[$xinterval,$domain,$xinterval]");
1.40      www       197: document.ggbApplet_$id.setVisible("$xvariable", false);
                    198: document.ggbApplet_$id.evalCommand("$xvariable=$xrel");
                    199: document.ggbApplet_$id.evalCommand("$yvariable=Slider[-$range,$range,$yinterval]");
                    200: document.ggbApplet_$id.setVisible("$yvariable", false);
                    201: document.ggbApplet_$id.evalCommand("$yvariable=$yrel");
1.48      www       202: document.ggbApplet_$id.evalCommand("$variable=$mult($xvariable+x($pointname),$yvariable+y($pointname))");
1.40      www       203: document.ggbApplet_$id.setLabelVisible("$variable", false);
                    204: ENDSETSVARIABLE
                    205: }
                    206: 
                    207: #
1.9       www       208: # Input field name for a coordinate variable
                    209: #
                    210: 
                    211: sub field_name {
                    212:     my ($id,$variable,$name)=@_;
                    213:     return "HWVAL_$id\_$variable\_$name";
                    214: }
                    215: 
                    216: #
                    217: # Generate an input field for a coordinate variable
                    218: #
                    219: 
                    220: sub generate_input_field {
                    221:     my ($id,$variable,$x,$y)=@_;
                    222:     $Apache::functionplotresponse::inputfields.=
                    223:        "<input type='hidden' name='".&field_name($id,$variable,'x')."' value='$x' />\n".
                    224:        "<input type='hidden' name='".&field_name($id,$variable,'y')."' value='$y' />\n";
                    225: }
                    226: 
                    227: #
1.40      www       228: # Initialize a new point coordinate variable at set a listener on it
1.6       www       229: #
1.40      www       230: sub new_point_coordinate {
1.48      www       231:     my ($id,$variable,$x,$y,$fixed)=@_;
1.11      www       232:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'x')})) {
1.10      www       233:        $x=$Apache::functionplotresponse::previous{&field_name($id,$variable,'x')};
                    234:     }
1.11      www       235:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'y')})) {
1.10      www       236:        $y=$Apache::functionplotresponse::previous{&field_name($id,$variable,'y')};
                    237:     }
1.9       www       238:     &generate_input_field($id,$variable,$x,$y);
1.48      www       239:     return &set_point_coordinate($id,$variable,$x,$y,$fixed).&update_register($id,$variable);
1.40      www       240: }
                    241: 
                    242: #
                    243: # Initialize a new slope coordinate variable at set a listener on it
                    244: #
                    245: sub new_slope_coordinate {
1.48      www       246:     my ($id,$variable,$x,$y,$pointname,$xp,$yp,$xmin,$xmax,$ymin,$ymax,$fixed)=@_;
1.40      www       247: #
                    248: # $variable: name of the slope point
                    249: # $x, $y: coordinates of the slope point
                    250: # $pointname: name of the associated point point
                    251: # $xp $yp: coordinates of the point point
                    252: #
                    253:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'x')})) {
                    254:        $x=$Apache::functionplotresponse::previous{&field_name($id,$variable,'x')};
                    255:     }
                    256:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'y')})) {
                    257:        $y=$Apache::functionplotresponse::previous{&field_name($id,$variable,'y')};
                    258:     }
                    259:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$pointname,'x')})) {
                    260:        $xp=$Apache::functionplotresponse::previous{&field_name($id,$pointname,'x')};
                    261:     }
                    262:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$pointname,'y')})) {
                    263:        $yp=$Apache::functionplotresponse::previous{&field_name($id,$pointname,'y')};
                    264:     }
                    265: 
                    266:     &generate_input_field($id,$variable,$x,$y);
                    267:     my $xrel=$x-$xp;
                    268:     my $yrel=$y-$yp;
1.48      www       269:     return &set_slope_coordinate($id,$variable,$xrel,$yrel,$xmin,$xmax,$ymin,$ymax,$pointname,$fixed).&update_register($id,$variable);
1.5       www       270: }
                    271: 
                    272: #
                    273: # This registers the init-function call for ggbOnInit, which LON-CAPA will place at </problem>
                    274: # It then starts the right headers
                    275: #
1.3       www       276: sub start_init_script {
                    277:     my ($id)=@_;
1.16      www       278: # Add id to the list of ggbInit_$id functions that need to be called
                    279:     push(@Apache::functionplotresponse::callscripts,$id);
1.5       www       280: # ... and open this function
1.3       www       281:     return (<<ENDSTARTINIT);
                    282: <script type="text/javascript">
                    283: // <![CDATA[
1.5       www       284: // variable that will eventually be passed back to the server
                    285: var coordinateMap_$id = [];
1.16      www       286: // flag for not loaded yet
                    287: var loaded_$id=false;
1.5       www       288: // Init-function for applet
1.3       www       289: function ggbInit_$id() {
                    290: ENDSTARTINIT
                    291: }
                    292: 
1.5       www       293: #
                    294: # This sets the axes inside ggbInit_$id
                    295: #
                    296: 
1.4       www       297: sub axes_script {
                    298:     my ($id,$xmin,$xmax,$ymin,$ymax,$xvisible,$yvisible,$gvisible)=@_;
                    299:     return (<<ENDAXESSCRIPT);
                    300:             // changes (xmin, xmax, ymin, ymax)
                    301:             document.ggbApplet_$id.setCoordSystem($xmin,$xmax,$ymin,$ymax);
                    302: 
                    303:             // makes the (x,y) axis (in)visible
                    304:             document.ggbApplet_$id.setAxesVisible($xvisible,$yvisible);
                    305:             // makes the grid (in)visible
                    306:             document.ggbApplet_$id.setGridVisible($gvisible);
                    307: ENDAXESSCRIPT
                    308: }
                    309: 
1.14      www       310: sub axes_label {
1.45      www       311:     my ($id,$xmin,$xmax,$ymin,$ymax,$xlabel,$ylabel)=@_;
1.14      www       312:     unless ($xlabel || $ylabel) { return ''; }
                    313:     my $return='document.ggbApplet_'.$id.'.evalCommand("topRight=Corner[3]");';
                    314:     if ($xlabel) {
1.45      www       315:       if (($ymin<0) && ($ymax>0)) {
1.14      www       316:        $return.=(<<ENDXAXISLABELSCRIPT);
                    317: document.ggbApplet_$id.evalCommand("Xlabel=(x(topRight)-AxisStepX[],AxisStepY[]/6)");
                    318: document.ggbApplet_$id.setVisible("Xlabel",false);
                    319: document.ggbApplet_$id.evalCommand("Text[\\"$xlabel\\", Xlabel]");
                    320: ENDXAXISLABELSCRIPT
1.45      www       321:       } else {
                    322:        $return.=(<<ENDXOFFAXISLABEL);
                    323: document.ggbApplet_$id.evalCommand("LowerRight=Corner[2]");
                    324: document.ggbApplet_$id.evalCommand("Text[\\"$xlabel\\", (x(LowerRight) - AxisStepX[], y(LowerRight) + AxisStepY[] / 2)]");
                    325: ENDXOFFAXISLABEL
                    326:       }
1.14      www       327:     }
                    328:     if ($ylabel) {
1.45      www       329:       if (($xmin<0) && ($xmax>0)) {
1.14      www       330:        $return.=(<<ENDYAXISLABELSCRIPT);
                    331: document.ggbApplet_$id.evalCommand("Ylabel=(AxisStepX[]/6,y(topRight)-AxisStepY[]/3)");
                    332: document.ggbApplet_$id.setVisible("Ylabel",false);
                    333: document.ggbApplet_$id.evalCommand("Text[\\"$ylabel\\", Ylabel]");
                    334: ENDYAXISLABELSCRIPT
1.45      www       335:       } else {
                    336:        $return.=(<<ENDYOFFAXISLABEL);
                    337: document.ggbApplet_$id.evalCommand("UpperLeft=Corner[4]");
                    338: document.ggbApplet_$id.evalCommand("Text[\\"$ylabel\\", (x(UpperLeft) + AxisStepX[] / 5, y(UpperLeft) - AxisStepY[] / 1.8)]");
                    339: ENDYOFFAXISLABEL
                    340:       }
1.14      www       341:     }
                    342:     return $return;
                    343: }
                    344: 
1.58      www       345: #
                    346: # Subroutine to produce background and answer plots
                    347: #
                    348: 
1.4       www       349: sub plot_script {
1.47      www       350:    my ($id,$function,$fixed,$label,$color,$xmin,$xmax,$thickness)=@_;
1.41      www       351:    $label=~s/\W//g;
                    352:    if (($label) && ($label!~/^[A-Za-z]/)) {
                    353:       $label='C'.$label;
                    354:    }
                    355:    my $visible=0;
                    356:    if ($label) {
                    357:       $visible="1";
                    358:    } else {
                    359:       $Apache::functionplotresponse::counter++;
                    360:       $label='C'.$Apache::functionplotresponse::counter;
                    361:    }
1.46      www       362:    my $rc=0;
                    363:    my $gc=0;
                    364:    my $bc=0;
                    365:    if ($color) {
                    366:       my ($rh,$gh,$bh)=($color=~/(..)(..)(..)/);
                    367:       $rc=hex($rh);
                    368:       $gc=hex($gh);
                    369:       $bc=hex($bh);
                    370:    }
1.6       www       371:    if ($fixed) {
1.43      www       372:       return "document.ggbApplet_$id.evalCommand('$label=Function[$function,$xmin,$xmax]');\n".
1.46      www       373:              ($visible?'':"document.ggbApplet_$id.setLabelVisible('$label', false);\n").
1.47      www       374:              ($color?"document.ggbApplet_$id.setColor('$label',$rc,$gc,$bc);\n":'').
                    375:              ($thickness?"document.ggbApplet_$id.setLineThickness('$label',$thickness);\n":'');
1.6       www       376:    } else {
1.46      www       377:        return "document.ggbApplet_$id.evalCommand('y=$function');\n";
1.6       www       378:    }
1.4       www       379: }
                    380: 
1.5       www       381: #
1.58      www       382: # Answer spline display
                    383: # 
                    384: # points: x,y,slope_x,slope_y
                    385: 
                    386: sub answer_spline_script {
                    387:    my ($id,@points)=@_;
                    388:    my $order=int(($#points+1)/4);
                    389:    if ($order<2) { $order=2; }
                    390:    if ($order>8) { $order=8; }
                    391:    $Apache::functionplotresponse::counter++;
1.60      www       392:    my $label='CSpline'.$Apache::functionplotresponse::counter;
1.59      www       393:    my $output='document.ggbApplet_'.$id.'.evalCommand("'.$label.'=Spline'.$order.'[';
                    394:    for (my $i=0;$i<=$#points;$i+=4) {
                    395:       $output.="($points[$i],$points[$i+1]),($points[$i+2],$points[$i+3]),";
                    396:    }
                    397:    $output=~s/\,$//;
                    398:    $output.=']");'."\n";
                    399:    for (my $i=2; $i<2*$order; $i+=2) {
1.61      www       400:        $output.='document.ggbApplet_'.$id.'.setColor("'.$label.'_'.($i>=10?'{':'').$i.($i>=10?'}':'').'",0,170,0);'."\n";
1.59      www       401:    }
1.60      www       402:    for (my $i=1; $i<2*$order; $i+=2) {
1.61      www       403:        $output.='document.ggbApplet_'.$id.'.setVisible("'.$label.'_'.($i>=10?'{':'').$i.($i>=10?'}':'').'",false);'."\n";
1.60      www       404:    }
                    405: 
1.59      www       406:    return $output;
1.58      www       407: }
                    408: 
                    409: #
1.7       www       410: # Subroutine that generates code for spline $label based on stored information
1.6       www       411: #
                    412: 
                    413: sub generate_spline {
1.48      www       414:    my ($id,$label,$xmin,$xmax,$ymin,$ymax,$fixed)=@_;
1.6       www       415:    my $result='';
1.7       www       416:    my $order=$Apache::functionplotresponse::splineorder{$label};
                    417:    my $x=$Apache::functionplotresponse::splineinitx{$label};
                    418:    my $y=$Apache::functionplotresponse::splineinity{$label};
                    419:    my $sx=$Apache::functionplotresponse::splinescalex{$label};
                    420:    my $sy=$Apache::functionplotresponse::splinescaley{$label};
                    421:    my @coords=();
                    422:    foreach my $i (1..$order) {
1.48      www       423:        $result.=&new_point_coordinate($id,$label.'P'.$i,$x,$y,$fixed);
1.40      www       424:        my $xp=$x;
1.8       www       425:        $x+=$sx/(2.*($order-1));
1.7       www       426:        push(@coords,$label.'P'.$i);
1.48      www       427:        $result.=&new_slope_coordinate($id,$label.'S'.$i,$x,$y+$sy,$label.'P'.$i,$xp,$y,$xmin,$xmax,$ymin,$ymax,$fixed);
1.8       www       428:        $x+=$sx/(2.*($order-1));
1.7       www       429:        push(@coords,$label.'S'.$i);
                    430:    }
                    431:    $result.='document.ggbApplet_'.$id.'.evalCommand("Spline'.$order.'['.join(',',@coords).']");'."\n";
1.6       www       432:    return $result;
                    433: }
                    434: #
                    435: # <backgroundplot function="..." fixed="yes/no" />
1.5       www       436: #
1.4       www       437: sub start_backgroundplot {
                    438:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    439:    my $result='';
                    440:    my $internalid = $Apache::inputtags::part.'_'.$Apache::inputtags::response[-1];
                    441:    my $function=&Apache::lonxml::get_param('function',$parstack,$safeeval);
1.47      www       442:    my $xinitial=&Apache::lonxml::get_param('xinitial',$parstack,$safeeval);
                    443:    my $xfinal=&Apache::lonxml::get_param('xfinal',$parstack,$safeeval);
1.41      www       444:    my $label=&Apache::lonxml::get_param('label',$parstack,$safeeval);
1.46      www       445:    my $color=&Apache::lonxml::get_param('color',$parstack,$safeeval);
                    446:    $color=~s/[^a-fA-F0-9]//gs;
                    447:    unless (length($color)==6) { $color=''; }
1.6       www       448:    my $fixed=(&Apache::lonxml::get_param('fixed',$parstack,$safeeval)=~/on|true|yes|1/i?1:0);
                    449:  
1.4       www       450:    unless ($function) { $function="0"; }
                    451:    if ($target eq 'web') {
1.41      www       452:       my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval,-3);
1.47      www       453:       unless (defined($xinitial)) { $xinitial=$xmin; }
                    454:       unless (defined($xfinal)) { $xfinal=$xmax; }
                    455:       $result.=&plot_script($internalid,$function,$fixed,$label,$color,$xinitial,$xfinal);
1.13      www       456:    } elsif ($target eq 'edit') {
                    457:         $result=&Apache::edit::tag_start($target,$token,'Background Function Plot').
                    458:              &Apache::edit::text_arg('Function:','function',
                    459:                                      $token,'16').
1.47      www       460:              &Apache::edit::text_arg('Initial x-value (optional):','xinitial',
                    461:                                      $token,'8').
                    462:              &Apache::edit::text_arg('Final x-value (optional):','xfinal',
                    463:                                      $token,'8').
1.41      www       464:              &Apache::edit::text_arg('Label on Plot:','label',
                    465:                                      $token,'8').
1.46      www       466:              &Apache::edit::text_arg('Color (hex code):','color',
                    467:                                      $token,'8').
1.13      www       468:              &Apache::edit::select_arg('Fixed location:','fixed',
                    469:                                   ['yes','no'],$token).
                    470:              &Apache::edit::end_row();
                    471:   } elsif ($target eq 'modified') {
                    472:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.47      www       473:                                                  $safeeval,'function','label','xinitial','xfinal','color','fixed');
1.13      www       474:     if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
                    475:   }
                    476:   return $result;
1.4       www       477: }
                    478: 
                    479: sub end_backgroundplot {
1.13      www       480:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    481:    my $result='';
                    482:    if ($target eq 'edit') {
                    483:        $result=&Apache::edit::end_table();
                    484:    }
                    485:    return $result;
1.6       www       486: }
                    487: 
                    488: #
1.25      www       489: # <functionplotrule ... />
1.12      www       490: #
1.25      www       491: sub start_functionplotrule {
1.12      www       492:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    493:    my $result='';
1.24      www       494:    my $label=&Apache::lonxml::get_param('index',$parstack,$safeeval);
                    495:    $Apache::functionplotresponse::counter++;
                    496:    if ($label=~/\W/) {
1.25      www       497:       &Apache::lonxml::warning(&mt('Rule indices should only contain alphanumeric characters.'));
1.24      www       498:    }
                    499:    $label=~s/\W//gs;
                    500:    unless ($label) {
                    501:       $label='R'.$Apache::functionplotresponse::counter;
                    502:    } else {
                    503:       $label='R'.$label;
                    504:    }
                    505:    if ($Apache::functionplotresponse::splineorder{$label}) {
1.25      www       506:        &Apache::lonxml::error(&mt('Rule indices must be unique.'));
1.24      www       507:    }
                    508: 
                    509: 
                    510:    if ($target eq 'grade') {
                    511: # Simply remember - in order - for later
1.25      www       512:       my $beginninglabel=&Apache::lonxml::get_param('xinitiallabel',$parstack,$safeeval);
                    513:       my $endinglabel=&Apache::lonxml::get_param('xfinallabel',$parstack,$safeeval);
1.24      www       514:       if (($beginninglabel=~/\W/) || ($endinglabel=~/W/)) {
1.25      www       515:           &Apache::lonxml::warning(&mt('Rule labels must be alphanumeric.'));
1.24      www       516:       }
                    517:       $beginninglabel=~s/\W//gs;
                    518:       $endinglabel=~s/\W//gs;
                    519:       my $relationship=&Apache::lonxml::get_param('relationship',$parstack,$safeeval);
                    520:       $relationship=~s/\W//gs;
                    521:       $relationship=lc($relationship);
                    522:       unless ($relationship=~/^(eq|ge|gt|le|lt|ne)$/) {
1.25      www       523:           &Apache::lonxml::warning(&mt('Rule relationship not defined.'));
1.24      www       524:           $relationship='eq';
                    525:       }
1.35      www       526:       my $derivative=&Apache::lonxml::get_param('derivativeorder',$parstack,$safeeval);
1.42      www       527:       unless (($derivative==-1) || ($derivative==0) || ($derivative==1) || ($derivative==2)) {
1.25      www       528:          &Apache::lonxml::warning(&mt('Rule derivative not defined.'));
1.24      www       529:          $derivative=0;
                    530:       }
1.25      www       531:       push(@Apache::functionplotresponse::functionplotrules,join(':',(
1.24      www       532:            $label,
                    533:            $derivative,
1.25      www       534:            &Apache::lonxml::get_param('xinitial',$parstack,$safeeval),
1.24      www       535:            $beginninglabel,
1.25      www       536:            &Apache::lonxml::get_param('xfinal',$parstack,$safeeval),
1.24      www       537:            $endinglabel,
1.35      www       538:            &Apache::lonxml::get_param('minimumlength',$parstack,$safeeval),
                    539:            &Apache::lonxml::get_param('maximumlength',$parstack,$safeeval),
1.24      www       540:            $relationship,
1.33      www       541:            &Apache::lonxml::get_param('value',$parstack,$safeeval),
                    542:            &Apache::lonxml::get_param('percenterror',$parstack,$safeeval)
1.24      www       543:           )));
                    544:    } elsif ($target eq 'edit') {
1.29      www       545:         $result=&Apache::edit::tag_start($target,$token,'Function Plot Evaluation Rule').
1.36      www       546:              &Apache::edit::text_arg('Index/Name:','index',
                    547:                                      $token,'10').'&nbsp;'.
1.35      www       548:              &Apache::edit::select_arg(&mt('Function:'),'derivativeorder',
1.29      www       549:                                   [['0','Function itself'],
                    550:                                    ['1','First derivative'],
1.42      www       551:                                    ['2','Second derivative'],
                    552:                                    ['-1','Integral']],$token).'<br />'.
1.44      www       553:              &Apache::edit::text_arg('Initial x-value:','xinitial',
1.35      www       554:                                       $token,'8').
1.44      www       555:              &Apache::edit::select_or_text_arg('Initial x-value label:','xinitiallabel',
                    556:                                                [['start','Start of Plot'],
                    557:                                                 ['end','End of Plot']],$token,'8').'<br />'.
1.30      www       558: 
1.44      www       559:              &Apache::edit::text_arg('Final x-value (optional):','xfinal',
1.35      www       560:                                       $token,'8').
1.44      www       561:              &Apache::edit::select_or_text_arg('Final x-value label (optional):','xfinallabel',
1.32      www       562:                                                [['end','End of Plot']],$token,'8').'<br />'.
1.44      www       563:              &Apache::edit::text_arg('Minimum length for range (optional):','minimumlength',
1.35      www       564:                                      $token,'8').
1.44      www       565:              &Apache::edit::text_arg('Maximum length for range (optional):','maximumlength',
1.35      www       566:                                      $token,'8').'<br />'.
1.38      www       567:              &Apache::edit::select_or_text_arg(&mt('Relationship:'),'relationship',
1.29      www       568:                                   [['eq','equal'],
                    569:                                    ['ne','not equal'],
                    570:                                    ['ge','greater than or equal'],
                    571:                                    ['gt','greater than'],
                    572:                                    ['lt','less than'],
                    573:                                    ['le','less than or equal']],$token).
                    574:              $result.= &Apache::edit::select_or_text_arg('Value:','value',
1.65      www       575:                                                [['undef','not defined']],$token,'30').
1.29      www       576:              &Apache::edit::text_arg('Percent error:','percenterror',
1.35      www       577:                                      $token,'8').
1.29      www       578:              &Apache::edit::end_row();
                    579:   } elsif ($target eq 'modified') {
1.54      www       580:     if (($env{'form.'.&Apache::edit::html_element_name('xinitial')} ne '') && ($env{'form.'.&Apache::edit::html_element_name('xinitiallabel')} eq 'start')) {
1.53      www       581:        $env{'form.'.&Apache::edit::html_element_name('xinitiallabel')}='';
                    582:     }
1.54      www       583:     if (($env{'form.'.&Apache::edit::html_element_name('xfinal')} ne '') && ($env{'form.'.&Apache::edit::html_element_name('xfinallabel')} eq 'end')) {
1.53      www       584:        $env{'form.'.&Apache::edit::html_element_name('xfinallabel')}='';
                    585:     }
1.29      www       586:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.35      www       587:                                                  $safeeval,'index','derivativeorder',
                    588:                                                            'xinitial','xinitiallabel','xfinal','xfinallabel',
                    589:                                                            'minimumlength','maximumlength',
                    590:                                                            'relationship','value','percenterror');
1.29      www       591:     if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
1.13      www       592:    }
1.12      www       593:    return $result;
                    594: }
                    595: 
1.25      www       596: sub end_functionplotrule {
1.13      www       597:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    598:    my $result='';
                    599:    if ($target eq 'edit') {
                    600:        $result=&Apache::edit::end_table();
                    601:    }
                    602:    return $result;
1.12      www       603: }
                    604: 
                    605: 
                    606: #
1.23      www       607: # <spline index="..." order="1,2,3,4" initx="..." inity="..." scalex="..." scaley="..." />
1.6       www       608: #
                    609: # Unfortunately, GeoGebra seems to want all splines after everything else, so we need to store them
                    610: #
                    611: sub start_spline {
                    612:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1.13      www       613:    my $result='';
                    614:    if ($target eq 'web') {
1.23      www       615:       my $label=&Apache::lonxml::get_param('index',$parstack,$safeeval);
1.13      www       616:       $Apache::functionplotresponse::counter++;
                    617:       if ($label=~/\W/) {
1.23      www       618:          &Apache::lonxml::warning(&mt('Spline indices should only contain alphanumeric characters.'));
1.13      www       619:       }
                    620:       $label=~s/\W//gs;
1.23      www       621:       unless ($label) { 
                    622:          $label='S'.$Apache::functionplotresponse::counter; 
                    623:       } else {
                    624:          $label='S'.$label;
                    625:       }
1.13      www       626:       if ($Apache::functionplotresponse::splineorder{$label}) {
1.23      www       627:          &Apache::lonxml::error(&mt('Spline indices must be unique.'));
1.13      www       628:       }
                    629: 
                    630:       my $order=&Apache::lonxml::get_param('order',$parstack,$safeeval);
                    631:       if ($order<2) { $order=2; }
                    632:       if ($order>8) { $order=8; }
                    633:       $Apache::functionplotresponse::splineorder{$label}=$order;
                    634: 
                    635:       my $x=&Apache::lonxml::get_param('initx',$parstack,$safeeval);
                    636:       unless ($x) { $x=0; }
                    637:       $Apache::functionplotresponse::splineinitx{$label}=$x;
                    638: 
                    639:       my $y=&Apache::lonxml::get_param('inity',$parstack,$safeeval);
                    640:       unless ($y) { $y=0; }
                    641:       $Apache::functionplotresponse::splineinity{$label}=$y;
                    642: 
                    643:       my $sx=&Apache::lonxml::get_param('scalex',$parstack,$safeeval);
                    644:       unless ($sx) { $sx=$order; }
                    645:       $Apache::functionplotresponse::splinescalex{$label}=$sx;
                    646: 
                    647:       my $sy=&Apache::lonxml::get_param('scaley',$parstack,$safeeval);
                    648:       unless ($sy) { $sy=2; }
                    649:       $Apache::functionplotresponse::splinescaley{$label}=$sy;
                    650:    } elsif ($target eq 'edit') {
                    651:         $result=&Apache::edit::tag_start($target,$token,'Spline').
1.23      www       652:              &Apache::edit::text_arg('Index:','index',
1.14      www       653:                                      $token,'4').'&nbsp;'.
1.13      www       654:              &Apache::edit::select_arg('Order:','order',
1.44      www       655:                                   ['2','3','4','5','6','7','8'],$token).'&nbsp;'.
1.13      www       656:              &Apache::edit::text_arg('Initial x-value:','initx',
1.14      www       657:                                      $token,'4').'&nbsp;'.
1.13      www       658:              &Apache::edit::text_arg('Initial y-value:','inity',
1.14      www       659:                                      $token,'4').'&nbsp;'.
1.13      www       660:              &Apache::edit::text_arg('Scale x:','scalex',
1.14      www       661:                                      $token,'4').'&nbsp;'.
1.13      www       662:              &Apache::edit::text_arg('Scale y:','scaley',
                    663:                                      $token,'4').
                    664:              &Apache::edit::end_row();
                    665:   } elsif ($target eq 'modified') {
                    666:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.23      www       667:                                                  $safeeval,'index','order','initx','inity',
1.13      www       668:                                                            'scalex','scaley');
                    669:     if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
                    670:   }
                    671:   return $result;
1.6       www       672: }
                    673: 
                    674: sub end_spline {
1.13      www       675:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    676:    my $result='';
                    677:    if ($target eq 'edit') {
                    678:        $result=&Apache::edit::end_table();
                    679:    }
                    680:    return $result;
1.4       www       681: }
                    682:  
1.3       www       683: sub end_init_script {
                    684:     return (<<ENDENDINIT);
                    685: }
                    686: // ]]>
                    687: </script>
                    688: ENDENDINIT
                    689: }
                    690: 
1.10      www       691: #
                    692: # Storing and restoring spline coordinates from part answers
                    693: #
                    694: sub decode_previous_answer {
                    695:    my ($answer)=@_;
                    696:    foreach my $coordinate (split(/\,/,$answer)) {
                    697:       my ($key,$value)=split(/\=/,$coordinate);
                    698:       $Apache::functionplotresponse::previous{$key}=$value;
                    699:    }
                    700: }
                    701: 
                    702: sub get_answer_from_form_fields {
                    703:    my ($id)=@_;
                    704:    my $answer='';
                    705:    my %coords=();
                    706:    foreach my $field (keys(%env)) {
                    707:       if ($field=~/^form\.HWVAL\_$id/) {
                    708:          $field=~/^form\.(.*)$/;
                    709:          $coords{$1}=$env{$field};
                    710:       }
                    711:    }
                    712:    $answer=join(',',map { $_.'='.$coords{$_} } (sort(keys(%coords))));
                    713:    return ($answer,%coords);
                    714: }
                    715: 
1.15      www       716: #
                    717: # The following functions calculate the cubic-hermite splines server-side
                    718: #
                    719: 
                    720: sub cubic_hermite {
                    721:    my ($t,$p1,$s1,$p2,$s2)=@_;
1.42      www       722:    return (2.*$t*$t*$t-3.*$t*$t+1.)*$p1 + 3.*($t*$t*$t-2.*$t*$t+$t)*($s1-$p1)+
                    723:           (-2.*$t*$t*$t+3.*$t*$t)  *$p2 + 3.*($t*$t*$t-$t*$t)      *($s2-$p2);
1.15      www       724: }
                    725: 
                    726: #
                    727: # d/dt(...)
                    728: # 
                    729: 
                    730: sub ddt_cubic_hermite {
                    731:    my ($t,$p1,$s1,$p2,$s2)=@_;
1.42      www       732:    return (6.*$t*$t-6.*$t) *$p1 + 3.*(3.*$t*$t-4.*$t+1.)*($s1-$p1)+
                    733:           (-6.*$t*$t+6.*$t)*$p2 + 3.*(3.*$t*$t-2.*$t)   *($s2-$p2);
1.15      www       734: }
                    735: 
                    736: #
                    737: # d^2/dt^2(...)
                    738: #
                    739: 
                    740: sub d2dt2_cubic_hermite {
                    741:    my ($t,$p1,$s1,$p2,$s2)=@_;
1.42      www       742:    return (12.*$t-6.) *$p1 + 3.*(6.*$t-4.)*($s1-$p1)+
                    743:           (-12.*$t+6.)*$p2 + 3.*(6.*$t-2.)*($s2-$p2);
1.15      www       744: }
                    745: 
                    746: #
1.18      www       747: # Array index calculation
                    748: #
                    749: sub array_index {
                    750:    my ($xmin,$xmax,$x)=@_;
1.38      www       751:    if ($x ne '') {
                    752:       return int(($x-$xmin)/($xmax-$xmin)*400.+0.5);
                    753:    } else {
                    754:       return undef;
                    755:    }
1.20      www       756: }
                    757: 
                    758: #
1.18      www       759: # Populate the arrays
                    760: #
                    761: 
                    762: sub populate_arrays {
1.64      www       763:     my ($id,$xmin,$xmax,$ymin,$ymax)=@_;
1.26      www       764:     for (my $i=0; $i<=400; $i++) {
1.35      www       765:        $Apache::functionplotresponse::actualxval[$i]=undef;
1.19      www       766:        $Apache::functionplotresponse::func[$i]=undef;
1.22      www       767:        $Apache::functionplotresponse::dfuncdx[$i]=undef;
1.19      www       768:        $Apache::functionplotresponse::d2funcd2x[$i]=undef;
1.18      www       769:     }
1.19      www       770:     unless ($xmax>$xmin) { return 'no_func'; }
1.18      www       771: # Run over all splines in response
                    772:     foreach my $label (split(/\,/,$env{"form.HWVAL_AllSplines_$id"})) {
1.19      www       773:         my $xiold=-1;
1.18      www       774: # Run over all points in spline
1.19      www       775:         for (my $i=1; $i<$env{"form.HWVAL_SplineOrder_".$id."_".$label}; $i++) {
1.18      www       776:             my $ni=$i+1;
                    777:             my @xparms=($env{'form.HWVAL_'.$id.'_'.$label.'P'.$i.'_x'},
                    778:                         $env{'form.HWVAL_'.$id.'_'.$label.'S'.$i.'_x'},
                    779:                         $env{'form.HWVAL_'.$id.'_'.$label.'P'.$ni.'_x'},
                    780:                         $env{'form.HWVAL_'.$id.'_'.$label.'S'.$ni.'_x'});
                    781:             my @yparms=($env{'form.HWVAL_'.$id.'_'.$label.'P'.$i.'_y'},
                    782:                         $env{'form.HWVAL_'.$id.'_'.$label.'S'.$i.'_y'},
                    783:                         $env{'form.HWVAL_'.$id.'_'.$label.'P'.$ni.'_y'},
                    784:                         $env{'form.HWVAL_'.$id.'_'.$label.'S'.$ni.'_y'});
                    785: # Run in small steps over spline parameter
1.26      www       786:             for (my $t=0; $t<=1; $t+=0.0001) {
1.35      www       787:                 my $xreal=&cubic_hermite($t,@xparms);
                    788:                 my $xi=&array_index($xmin,$xmax,$xreal);
1.19      www       789:                 if ($xi<$xiold) { return 'no_func'; }
1.26      www       790:                 if (($xi>$xiold) && ($xi>=0) && ($xi<=400)) {
1.18      www       791:                    $xiold=$xi;
1.35      www       792:                    $Apache::functionplotresponse::actualxval[$xi]=$xreal;
1.22      www       793: # Function value
1.30      www       794:                    my $funcval=&cubic_hermite($t,@yparms);
1.64      www       795: 
                    796: # Do we already have a value for this point, and is it different from the new one?
                    797:                    if ((defined($Apache::functionplotresponse::func[$xi])) &&
                    798:                        (abs($Apache::functionplotresponse::func[$xi]-$funcval)>($ymax-$ymin)/100.)) { 
                    799:                        return 'no_func'; 
                    800:                    }
                    801: # Okay, remember the new point
1.30      www       802:                    $Apache::functionplotresponse::func[$xi]=$funcval;
1.64      www       803: 
1.30      www       804:                    if (defined($funcval)) {
                    805:                       if ($xi<$Apache::functionplotresponse::functionplotrulelabels{'start'}) {
                    806:                          $Apache::functionplotresponse::functionplotrulelabels{'start'}=$xi;
                    807:                       }
                    808:                       if ($xi>$Apache::functionplotresponse::functionplotrulelabels{'end'}) {
                    809:                          $Apache::functionplotresponse::functionplotrulelabels{'end'}=$xi;
                    810:                       }
                    811:                    }
1.28      www       812: # Chain rule
1.22      www       813: # dy/dx=dy/dt/(dx/dt)
                    814:                    my $dxdt=&ddt_cubic_hermite($t,@xparms);
                    815:                    if ($dxdt) {
                    816:                       $Apache::functionplotresponse::dfuncdx[$xi]=&ddt_cubic_hermite($t,@yparms)/$dxdt;
1.34      www       817: # Second derivative
1.28      www       818:                       $Apache::functionplotresponse::d2funcdx2[$xi]=
1.34      www       819:                          ($dxdt*&d2dt2_cubic_hermite($t,@yparms)-&ddt_cubic_hermite($t,@yparms)*&d2dt2_cubic_hermite($t,@xparms))/
                    820:                          ($dxdt*$dxdt*$dxdt);
1.22      www       821:                    }
1.18      www       822:                 }
                    823:             }
                    824:         }
                    825:     }
                    826: }
                    827: 
                    828: #
1.37      www       829: # Implementation of <functionplotresponse>
1.15      www       830: #
                    831: 
1.1       www       832: sub start_functionplotresponse {
                    833:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                    834:   my $result='';
1.6       www       835: # To remember the splines - somehow, they need to come last
                    836:   undef %Apache::functionplotresponse::splineorder;
                    837:   undef %Apache::functionplotresponse::splineinitx;
                    838:   undef %Apache::functionplotresponse::splineinity;
                    839:   undef %Apache::functionplotresponse::splinescalex;
                    840:   undef %Apache::functionplotresponse::splinescaley;
1.10      www       841: # Remember input fields, etc
                    842:   undef %Apache::functionplotresponse::previous;
1.9       www       843:   $Apache::functionplotresponse::inputfields='';
1.6       www       844:   $Apache::functionplotresponse::counter=0;
1.24      www       845: # Remember rules
1.25      www       846:   undef @Apache::functionplotresponse::functionplotrules;
1.37      www       847: # Remember failed rules
                    848:   if ($target eq 'grade') {
                    849:      undef @Apache::functionplotresponse::failedrules;
                    850:   }
                    851: # Delete previous awards
                    852:   undef $Apache::functionplotresponse::awarddetail;
1.10      www       853: # Part and ID
                    854:   my $partid=$Apache::inputtags::part;
                    855:   my $id=&Apache::response::start_response($parstack,$safeeval);
1.6       www       856: # Internal ID to mark the applet and its coordinates
1.10      www       857:   my $internalid = $partid.'_'.$id;
                    858: # Previous answer
                    859:   &decode_previous_answer($Apache::lonhomework::history{"resource.$partid.$id.submission"});
                    860: 
1.6       www       861: # Parameters of <functionplotresponse>
1.41      www       862:   my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval);
1.6       www       863:   my $xaxisvisible=(&Apache::lonxml::get_param('xaxisvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
                    864:   my $yaxisvisible=(&Apache::lonxml::get_param('yaxisvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
                    865:   my $gridvisible=(&Apache::lonxml::get_param('gridvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
1.14      www       866:   my $xlabel=&Apache::lonxml::get_param('xlabel',$parstack,$safeeval);
                    867:   my $ylabel=&Apache::lonxml::get_param('ylabel',$parstack,$safeeval);
1.12      www       868:   if ($target eq 'edit') {
                    869:     $result.=&Apache::edit::start_table($token)
                    870:        .'<tr><td><span class="LC_nobreak">'.&mt('Function Plot Question').'</span></td>'
                    871:        .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
1.37      www       872:        .&Apache::edit::deletelist($target,$token).'&nbsp;&nbsp;&nbsp;'
1.50      www       873:        .&Apache::edit::insertlist($target,$token).'&nbsp;&nbsp;&nbsp;'
                    874:        .&Apache::loncommon::help_open_topic('Function_Plot_Response_Question','Function Plot Responses')
1.12      www       875:        .'</span></td>'
                    876:        ."<td>&nbsp;"
                    877:        .&Apache::edit::end_row()
                    878:        .&Apache::edit::start_spanning_row()
                    879:        ."\n";
1.14      www       880:     $result.=&Apache::edit::text_arg('Label x-axis:','xlabel',
                    881:                                      $token,'6').'&nbsp;'.
                    882:              &Apache::edit::text_arg('Minimum x-value:','xmin',
                    883:                                      $token,'4').'&nbsp;'.
1.12      www       884:              &Apache::edit::text_arg('Maximum x-value:','xmax',
1.14      www       885:                                      $token,'4').'&nbsp;'.
1.12      www       886:              &Apache::edit::select_arg('x-axis visible:','xaxisvisible',
1.32      www       887:                                   ['yes','no'],$token).'<br />'.
1.14      www       888:              &Apache::edit::text_arg('Label y-axis:','ylabel',
                    889:                                      $token,'6').'&nbsp;'.
1.12      www       890:              &Apache::edit::text_arg('Minimum y-value:','ymin',
1.14      www       891:                                      $token,'4').'&nbsp;'.
1.12      www       892:              &Apache::edit::text_arg('Maximum y-value:','ymax',
1.14      www       893:                                      $token,'4').'&nbsp;'.
1.12      www       894:              &Apache::edit::select_arg('y-axis visible:','yaxisvisible',
1.32      www       895:                                   ['yes','no'],$token).'<br />'.
1.12      www       896:              &Apache::edit::select_arg('Grid visible:','gridvisible',
1.47      www       897:                                   ['yes','no'],$token).'<br />'.
1.58      www       898:              &Apache::edit::text_arg('Background plot(s) for answer (function(x):xmin:xmax,function(x):xmin:xmax,x1:y1:sx1:sy1:x2:y2:sx2:sy2,...):',
1.63      raeburn   899:                                          'answerdisplay',$token,'50').
1.12      www       900:              &Apache::edit::end_row().&Apache::edit::start_spanning_row();
                    901:   } elsif ($target eq 'modified') {
                    902:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.14      www       903:                                                  $safeeval,'xlabel','xmin','xmax','ylabel','ymin','ymax',
1.47      www       904:                                                            'xaxisvisible','yaxisvisible','gridvisible','answerdisplay');
1.12      www       905:     if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.3       www       906: 
1.12      www       907:   } elsif ($target eq 'meta') {
1.10      www       908:        $result=&Apache::response::meta_package_write('functionplotresponse');
1.35      www       909:   } elsif (($target eq 'answer') &&
                    910:             ($env{'form.answer_output_mode'} ne 'tex') &&
                    911:             ($Apache::lonhomework::viewgrades == 'F')) {
                    912:       my (undef,undef,$udom,$uname)=&Apache::lonnet::whichuser();
                    913:       my $windowopen=&Apache::lonhtmlcommon::javascript_docopen();
                    914:       my $start_page = &Apache::loncommon::start_page('Rules Log', undef,
                    915:                                                {'only_body' => 1,
                    916:                                                 'bgcolor'   => '#FFFFFF',
                    917:                                                 'js_ready'  => 1,});
                    918:       my $end_page = &Apache::loncommon::end_page({'js_ready' => 1,});
                    919:       $uname =~s/\W//g;
                    920:       $udom  =~s/\W//g;
                    921:       my $function_name =
                    922:                 join('_','LONCAPA_scriptvars',$uname,$udom,
                    923:                      $env{'form.counter'},$Apache::lonxml::curdepth);
                    924:       my $rules_var ="<script type=\"text/javascript\">
                    925: // <![CDATA[
                    926:     function $function_name() {newWindow=open('','new_W','width=500,height=500,scrollbars=1,resizable=yes');newWindow.$windowopen;newWindow.document.writeln('$start_page<pre>".
                    927:     $Apache::functionplotresponse::ruleslog.
                    928:     "<\\/pre>$end_page');newWindow.document.close();newWindow.focus()}
                    929: // ]]>
                    930: </script><a href=\"javascript:$function_name();void(0);\">".&mt('Rules Log')."</a><br />";
                    931:             &Apache::lonxml::add_script_result($rules_var);
                    932:         }
                    933: 
1.1       www       934:   return $result;
                    935: }
                    936: 
1.25      www       937: sub compare_rel {
1.26      www       938:    my ($relationship,$value,$realval,$tol)=@_;
1.36      www       939: # is the real value undefined?
1.26      www       940:    unless (defined($realval)) {
1.36      www       941: # the real value is not defined
1.26      www       942:       if ($relationship eq 'eq') {
                    943:          if ($value eq 'undef') {
                    944:             return 1;
                    945:          } else {
                    946:             return 0;
                    947:          }
                    948:       } elsif ($relationship eq 'ne') {
                    949:          if ($value eq 'undef') {
                    950:             return 0;
                    951:          } else {
                    952:             return 1;
                    953:          }
                    954:       } else {
                    955:          return 0;
                    956:       }
                    957:    }
                    958: 
1.36      www       959: # is the expected value undefined?
                    960:    if ($value eq 'undef') {
                    961: # but by now we know that the real value is defined
                    962:       return 0;
                    963:    }
                    964: 
                    965: # both are defined.
1.26      www       966:    if ($relationship eq 'gt') {
                    967:       return ($realval>$value);
                    968:    } elsif ($relationship eq 'ge') {
                    969:       return ($realval>$value-$tol);
                    970:    } elsif ($relationship eq 'lt') {
                    971:       return ($realval<$value);
                    972:    } elsif ($relationship eq 'le') {
                    973:       return ($realval<$value+$tol);
                    974:    } elsif ($relationship eq 'ne') {
                    975:       return (abs($value-$realval)>$tol);
                    976:    } else {
                    977:       return (abs($value-$realval)<$tol);
                    978:    }
1.25      www       979:    return 0;
                    980: }
                    981: 
1.35      www       982: sub addlog {
                    983:    my ($text)=@_;
1.67      www       984:    $text=~s/\'/\\\'/g;
1.35      www       985:    $Apache::functionplotresponse::ruleslog.=$text.'<br />';
                    986: }
                    987: 
                    988: sub actualval {
                    989:    my ($i,$xmin,$xmax)=@_;
                    990:    return $xmin+$i/400.*($xmax-$xmin);
                    991: }
1.65      www       992: 
1.66      www       993: sub fpr_val {
                    994:    my ($arg)=@_;
                    995:    return &actualval($Apache::functionplotresponse::functionplotrulelabels{$arg},
                    996:                      $Apache::functionplotresponse::fpr_xmin,
                    997:                      $Apache::functionplotresponse::fpr_xmax);
                    998: }
                    999: 
1.65      www      1000: sub fpr_f {
                   1001:    my ($arg)=@_;
                   1002:    return $Apache::functionplotresponse::func[&array_index($Apache::functionplotresponse::fpr_xmin,
                   1003:                                                            $Apache::functionplotresponse::fpr_xmax,
                   1004:                                                            $arg)];
                   1005: }
                   1006: 
                   1007: sub fpr_dfdx {
                   1008:    my ($arg)=@_;
                   1009:    return $Apache::functionplotresponse::dfuncdx[&array_index($Apache::functionplotresponse::fpr_xmin,
                   1010:                                                               $Apache::functionplotresponse::fpr_xmax,
                   1011:                                                               $arg)];
                   1012: }
                   1013: 
                   1014: sub fpr_d2fdx2 {
                   1015:    my ($arg)=@_;
                   1016:    return $Apache::functionplotresponse::d2funcdx2[&array_index($Apache::functionplotresponse::fpr_xmin,
                   1017:                                                                 $Apache::functionplotresponse::fpr_xmax,
                   1018:                                                                 $arg)];
                   1019: }
1.35      www      1020:  
1.25      www      1021: sub functionplotrulecheck {
1.65      www      1022:    my ($rule,$xmin,$xmax,$ymin,$ymax,$safeeval)=@_;
1.33      www      1023: 
1.35      www      1024:    my ($label,$derivative,$xinitial,$xinitiallabel,$xfinal,$xfinallabel,$minimumlength,$maximumlength,$relationship,$value,$percent)
1.25      www      1025:       =split(/\:/,$rule);
1.33      www      1026:    $percent=($percent>0?$percent:5);
1.35      www      1027:    &addlog("=================");
1.42      www      1028:    &addlog("Rule $label for ".($derivative<0?'integral':('function itself','first derivative','second derivative')[$derivative])." $relationship $value");
1.65      www      1029: #
                   1030: # Evaluate the value
                   1031: #
                   1032:    if ($value=~/\D/) {
                   1033:       $Apache::functionplotresponse::fpr_xmin=$xmin;
                   1034:       $Apache::functionplotresponse::fpr_xmax=$xmax;
                   1035:       $value=&Apache::run::run($value,$safeeval);
                   1036:       &addlog("Value evaluated to $value");
                   1037:    }
                   1038: 
                   1039: #
                   1040: # Minimum and maximum lengths of the interval
                   1041: #
1.49      www      1042:    if ((defined($minimumlength)) || (defined($maximumlength))) {
                   1043:       &addlog("Minimumlength $minimumlength Maximumlength $maximumlength");
                   1044:    }
1.30      www      1045:    my $li=0;
                   1046:    my $lh=400;
                   1047: 
1.31      www      1048: # Special case: the upper boundary was not defined
                   1049: # and needs to be set to the value where
                   1050: # the condition is not true anymore => set flag
                   1051: 
                   1052:    my $findupper=0;
                   1053:    if (($xfinal eq '')
                   1054:     && (!defined($Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}))
                   1055:     && ($xfinallabel)) {
                   1056:        $findupper=1;
                   1057:    }
                   1058: 
1.25      www      1059: # if a hard value is set for the boundaries, it overrides the label
1.30      www      1060:    if (($xinitial ne '') && ($xinitiallabel ne '') && ($xinitiallabel ne 'start')) {
                   1061:       $li=&array_index($xmin,$xmax,$xinitial);
                   1062:       $Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel}=$li;
                   1063:    }
                   1064:    if (($xfinal ne '') && ($xfinallabel ne '') && ($xfinallabel ne 'end')) {
                   1065:       $lh=&array_index($xmin,$xmax,$xfinal);
                   1066:       $Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}=$lh;
1.25      www      1067:    }
1.31      www      1068: # if the label is defined, use it
1.25      www      1069:    if (defined($Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel})) {
1.35      www      1070:       &addlog("Using lower label $xinitiallabel");
1.30      www      1071:       $li=$Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel};
                   1072:    } else {
                   1073:       $li=&array_index($xmin,$xmax,$xinitial);
1.25      www      1074:    }
1.31      www      1075:    unless ($findupper) {
                   1076:       if (defined($Apache::functionplotresponse::functionplotrulelabels{$xfinallabel})) {
1.35      www      1077:          &addlog("Using upper label $xfinallabel");
1.33      www      1078:          $lh=$Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}-1;
1.31      www      1079:       } else {
                   1080:          $lh=&array_index($xmin,$xmax,$xfinal);
                   1081:       }
1.25      www      1082:    }
                   1083: # Basic sanity checks
1.30      www      1084:    if ($li<0) { $li=0; }
                   1085:    if ($lh>400) { $lh=400; }
1.38      www      1086:    if (($li>$lh) || (!defined($lh))) {
1.30      www      1087:        $lh=$li;
1.25      www      1088:    }
1.31      www      1089: 
1.35      www      1090:    &addlog("Boundaries: x=".&actualval($li,$xmin,$xmax)." (".$Apache::functionplotresponse::actualxval[$li]."; index $li)) to x=".
                   1091:                             &actualval($lh,$xmin,$xmax)." (".$Apache::functionplotresponse::actualxval[$lh]."; index $lh))");
                   1092:    if ($findupper) {
                   1093:       &addlog("Looking for label $xfinallabel");
                   1094:    }
1.33      www      1095:    my $tol=$percent*($ymax-$ymin)/100;
                   1096:    if ($xmax>$xmin) {
                   1097:       if ($derivative==2) {
                   1098:          $tol=4.*$tol/($xmax-$xmin);
                   1099:       } elsif ($derivative==1) {
                   1100:          $tol=2.*$tol/($xmax-$xmin);
1.42      www      1101:       } elsif ($derivative==-1) {
                   1102:          $tol=$tol*($xmax-$xmin)/2.;
1.33      www      1103:       }
1.27      www      1104:    }
1.42      www      1105:    my $integral=0;
                   1106:    my $binwidth=($xmax-$xmin)/400.;
                   1107:    if (($derivative<0) && (!$findupper)) {
                   1108: # definite integral, calculate over whole length
                   1109:      &addlog("Calculating definite integral");
                   1110:      for (my $i=$li; $i<=$lh; $i++) {
                   1111:         $integral+=$Apache::functionplotresponse::func[$i]*$binwidth;
                   1112:      }
                   1113:      unless (&compare_rel($relationship,$value,$integral,$tol)) {
                   1114:         &addlog("Actual integral ".(defined($integral)?$integral:'undef').", expected $value, tolerance $tol");
                   1115:         &addlog("Rule $label failed.");
                   1116:         my $hintlabel=$label;
                   1117:         $hintlabel=~s/^R//;
                   1118:         push(@Apache::functionplotresponse::failedrules,$hintlabel);
                   1119:         &addlog("Set hint condition $hintlabel");
                   1120:         return 0;
                   1121:      } 
                   1122:    } else {
                   1123:      for (my $i=$li; $i<=$lh; $i++) {
1.25      www      1124:         my $val;
                   1125:         if ($derivative==2) {
1.27      www      1126:            $val=$Apache::functionplotresponse::d2funcdx2[$i];
1.25      www      1127:         } elsif ($derivative==1) {
1.27      www      1128:            $val=$Apache::functionplotresponse::dfuncdx[$i];
1.42      www      1129:         } elsif ($derivative==-1) {
                   1130:            $integral+=$Apache::functionplotresponse::func[$i]*$binwidth;
                   1131:            $val=$integral;      
1.25      www      1132:         } else {
1.27      www      1133:            $val=$Apache::functionplotresponse::func[$i];
1.25      www      1134:         }
1.31      www      1135:         unless (&compare_rel($relationship,$value,$val,$tol)) { 
1.37      www      1136:            &addlog("Actual value ".(defined($val)?$val:'undef').", expected $value, tolerance $tol");
1.35      www      1137:            &addlog("Condition not fulfilled at x=".&actualval($i,$xmin,$xmax)." (".$Apache::functionplotresponse::actualxval[$i]."; index $i)");
1.31      www      1138:            if (($findupper) && ($i>$li)) {
1.49      www      1139: # Check lengths
                   1140:               unless (&checklength($i,$li,$minimumlength,$maximumlength,$xmin,$xmax,$label)) { return 0; }
                   1141: # Successfully found a new label, set it
1.31      www      1142:               $Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}=$i;
1.35      www      1143:               &addlog("Rule $label passed, setting label $xfinallabel");
1.31      www      1144:               return 1;
                   1145:            } else {
1.35      www      1146:               &addlog("Rule $label failed.");
1.49      www      1147:               &setfailed($label);
1.31      www      1148:               return 0; 
                   1149:            }
                   1150:         }
1.42      www      1151:      }
1.25      www      1152:    }
1.49      www      1153: # Corner case where this makes sense: using start or stop as defined labels
                   1154:    unless (&checklength($lh,$li,$minimumlength,$maximumlength,$xmin,$xmax,$label)) { return 0; }
1.35      www      1155:    &addlog("Rule $label passed.");
1.27      www      1156:    return 1;
1.24      www      1157: }
                   1158: 
1.49      www      1159: #
                   1160: # check for minimum and maximum lengths
                   1161: #
                   1162: 
                   1163: sub checklength {
                   1164:     my ($i,$li,$minimumlength,$maximumlength,$xmin,$xmax,$label)=@_;
                   1165:     unless (($minimumlength) || ($maximumlength)) { return 1; }
                   1166:     my $length=&actualval($i,$xmin,$xmax)-&actualval($li,$xmin,$xmax);
                   1167:     if ($minimumlength) {
                   1168:        if ($length<$minimumlength) {
                   1169:           &addlog("Rule $label failed, actual length $length, minimum length $minimumlength");
                   1170:           &setfailed($label);
                   1171:           return 0;
                   1172:        }
                   1173:     }
                   1174:     if ($maximumlength) {
                   1175:        if ($length>$maximumlength) {
                   1176:           &addlog("Rule $label failed, actual length $length, maximum length $maximumlength");
                   1177:           &setfailed($label);
                   1178:           return 0;
                   1179:        }
                   1180:     }
                   1181:     return 1;
                   1182: }
                   1183: 
                   1184: sub setfailed {
                   1185:    my ($label)=@_;
                   1186:    my $hintlabel=$label;
                   1187:    $hintlabel=~s/^R//;
                   1188:    push(@Apache::functionplotresponse::failedrules,$hintlabel);
                   1189:    &addlog("Set hint condition $hintlabel");
                   1190: }
                   1191: 
1.37      www      1192: sub start_functionplotruleset {
                   1193:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1194:    if ($target eq 'edit') {
                   1195:       return &Apache::edit::start_table($token).
                   1196:         '<tr><td><span class="LC_nobreak">'.&mt('Function Plot Rule Set').'</span></td>'
                   1197:        .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
                   1198:        .&Apache::edit::deletelist($target,$token).'&nbsp;&nbsp;&nbsp;'.
1.50      www      1199:         &Apache::edit::insertlist($target,$token).'&nbsp;&nbsp;&nbsp;'
                   1200:        .&Apache::loncommon::help_open_topic('Function_Plot_Response_Rule_Set','Function Plot Rules')
1.37      www      1201:        .'</span></td>'
                   1202:        ."<td>&nbsp;"
                   1203:        .&Apache::edit::end_row()
                   1204:        .&Apache::edit::start_spanning_row()
                   1205:        ."\n";
                   1206:    }
                   1207: }
1.3       www      1208: 
1.37      www      1209: sub end_functionplotruleset {
                   1210:     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1211:     my $id=$Apache::inputtags::response[-1];
                   1212:     my $partid=$Apache::inputtags::part;
                   1213:     my $internalid = $partid.'_'.$id;
                   1214: 
                   1215:     if ($target eq 'edit' ) {
                   1216:         return &Apache::edit::end_table();
                   1217:     }  elsif ($target eq 'grade'
1.10      www      1218:          && &Apache::response::submitted()
                   1219:          && $Apache::lonhomework::type ne 'exam') {
1.12      www      1220: #
                   1221: # Actually grade
                   1222: #
1.41      www      1223:     my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval,-2);
1.27      www      1224: 
1.24      www      1225:         my $ad='';
1.30      www      1226:         undef  %Apache::functionplotresponse::functionplotrulelabels;
1.35      www      1227:         $Apache::functionplotresponse::ruleslog='';
1.30      www      1228:         $Apache::functionplotresponse::functionplotrulelabels{'start'}=400;
                   1229:         $Apache::functionplotresponse::functionplotrulelabels{'end'}=0;
1.64      www      1230:         if (&populate_arrays($internalid,$xmin,$xmax,$ymin,$ymax) eq 'no_func') {
1.21      www      1231:            $ad='NOT_FUNCTION';
1.18      www      1232:         } else {
1.35      www      1233:            &addlog("Start of function ".&actualval($Apache::functionplotresponse::functionplotrulelabels{'start'},$xmin,$xmax)." (index ".
                   1234:                                         $Apache::functionplotresponse::functionplotrulelabels{'start'}.")");
                   1235:            &addlog("End of function ".&actualval($Apache::functionplotresponse::functionplotrulelabels{'end'},$xmin,$xmax)." (index ".
                   1236:                                         $Apache::functionplotresponse::functionplotrulelabels{'end'}.")");
                   1237: 
1.24      www      1238: # We have a function that we can actually grade, go through the spline rules.
1.25      www      1239:            foreach my $rule (@Apache::functionplotresponse::functionplotrules) {
1.65      www      1240:               unless (&functionplotrulecheck($rule,$xmin,$xmax,$ymin,$ymax,$safeeval)) {
1.24      www      1241:                  $ad='INCORRECT';
                   1242:                  last;
                   1243:               }
                   1244:            }
                   1245: # If it's not wrong, it's correct 
                   1246:            unless ($ad) { $ad='EXACT_ANS' };
1.18      www      1247:         }
1.37      www      1248:         &addlog("Set hint conditions: ".join(",",@Apache::functionplotresponse::failedrules));
                   1249:         &addlog("Assigned award detail: $ad");
                   1250: # Store for later to be assigned at end_functionplotresponse
                   1251:         $Apache::functionplotresponse::awarddetail=$ad;
                   1252:      }
                   1253: }
                   1254: 
                   1255: 
                   1256: sub end_functionplotresponse {
                   1257:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1258:   &Apache::response::end_response;
                   1259: 
                   1260:   my $result;
                   1261:   my $id=$Apache::inputtags::response[-1];
                   1262:   my $partid=$Apache::inputtags::part;
                   1263:   my $internalid = $partid.'_'.$id;
1.20      www      1264: 
1.37      www      1265:     if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
                   1266:     if ($target eq 'grade'
                   1267:          && &Apache::response::submitted()
                   1268:          && $Apache::lonhomework::type eq 'exam') {
                   1269: 
                   1270:         &Apache::response::scored_response($partid,$id);
                   1271: 
                   1272:     } elsif ($target eq 'grade'
                   1273:          && &Apache::response::submitted()
                   1274:          && $Apache::lonhomework::type ne 'exam') {
                   1275:         my ($response,%coords)=&get_answer_from_form_fields($internalid);
                   1276:         $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
                   1277:         my %previous=&Apache::response::check_for_previous($response,$partid,$id);
                   1278: #
                   1279: # Assign grade
                   1280: #
                   1281:         my $ad=$Apache::functionplotresponse::awarddetail;
1.12      www      1282: #
                   1283: # Store grading info
                   1284: #
                   1285:         $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
                   1286:         &Apache::response::handle_previous(\%previous,$ad);
1.10      www      1287:    } elsif ($target eq 'web') {
1.37      www      1288:         undef @Apache::functionplotresponse::failedrules;
                   1289:    }
                   1290:    return $result;
                   1291: }
                   1292: 
                   1293: sub end_functionplotelements {
                   1294:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
                   1295:   my $result='';
                   1296:   my $id=$Apache::inputtags::response[-1];
                   1297:   my $partid=$Apache::inputtags::part;
                   1298:   my $internalid = $partid.'_'.$id;
                   1299:   if ($target eq 'edit' ) {
                   1300:      $result=&Apache::edit::end_table();
                   1301:   } elsif ($target eq 'web') {
1.47      www      1302:      my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval,-2);
                   1303: 
                   1304: # Are we in show answer mode?
                   1305:      my $showanswer=&Apache::response::show_answer();
                   1306:      if ($showanswer) {
                   1307: # Render answerdisplay
                   1308:         my $answerdisplay=&Apache::lonxml::get_param('answerdisplay',$parstack,$safeeval,-2);
                   1309:         if ($answerdisplay=~/\S/s) {
                   1310:            foreach my $plot (split(/\s*\,\s*/,$answerdisplay)) {
1.58      www      1311:               my @components=split(/\s*\:\s*/,$plot);
                   1312:               if ($#components<3) {
                   1313: # Just a simple plot
                   1314:                  my ($func,$xl,$xh)=@components;
                   1315:                  if ((!defined($xl)) || ($xl eq '')) { $xl=$xmin; }
                   1316:                  if ((!defined($xh)) || ($xh eq '')) { $xh=$xmax; }
                   1317:                  $result.=&plot_script($internalid,$func,1,'','00aa00',$xl,$xh,6);
                   1318:               } else {
                   1319: # This is a spline
1.59      www      1320:                  $result.=&answer_spline_script($internalid,@components);
1.58      www      1321:               }
1.47      www      1322:            }
                   1323:         }
                   1324:      }
1.48      www      1325:      my $fixed=0;
                   1326:      if (($showanswer) || (&Apache::response::check_status()>=2)) { $fixed=1; }
1.6       www      1327: # Now is the time to render all of the stored splines
                   1328:      foreach my $label (keys(%Apache::functionplotresponse::splineorder)) {
1.48      www      1329:         $result.=&generate_spline($internalid,$label,$xmin,$xmax,$ymin,$ymax,$fixed);
1.6       www      1330:      }
1.5       www      1331: # close the init script
1.3       www      1332:      $result.=&end_init_script();
1.17      www      1333: # register all splines in this response 
                   1334:      $result.='<input type="hidden" name="HWVAL_AllSplines_'.$internalid.'" value="'.
                   1335:                  join(',',keys(%Apache::functionplotresponse::splineorder)).'" />'."\n";
                   1336:      foreach my $label (keys(%Apache::functionplotresponse::splineorder)) {
                   1337:         $result.='<input type="hidden" name="HWVAL_SplineOrder_'.$internalid.'_'.$label.'" value="'.
                   1338:                  $Apache::functionplotresponse::splineorder{$label}.'" />'."\n";
                   1339:      }
1.9       www      1340: # generate the input fields
                   1341:      $result.=$Apache::functionplotresponse::inputfields;
1.5       www      1342: # actually start the <applet>-tag
1.3       www      1343:      $result.=&geogebra_startcode($internalid);
1.5       www      1344: # load the spline bytecode
1.3       www      1345:      $result.=&geogebra_spline_program();
1.5       www      1346: # set default parameters
1.3       www      1347:      $result.=&geogebra_default_parameters($internalid);
1.5       www      1348: # close the <applet>-tag
1.1       www      1349:      $result.=&geogebra_endcode();
                   1350:   }
                   1351:   return $result;
                   1352: }
                   1353: 
1.41      www      1354: sub boundaries {
                   1355:    my ($parstack,$safeeval,$level)=@_;
                   1356:    my $xmin=&Apache::lonxml::get_param('xmin',$parstack,$safeeval,$level);
                   1357:    $xmin=(defined($xmin)?$xmin:-10);
                   1358:    my $xmax=&Apache::lonxml::get_param('xmax',$parstack,$safeeval,$level);
                   1359:    $xmax=(defined($xmax)?$xmax:10);
                   1360:    my $ymin=&Apache::lonxml::get_param('ymin',$parstack,$safeeval,$level);
                   1361:    $ymin=(defined($ymin)?$ymin:-10);
                   1362:    my $ymax=&Apache::lonxml::get_param('ymax',$parstack,$safeeval,$level);
                   1363:    $ymax=(defined($ymax)?$ymax:10);
                   1364:    if ($xmax<=$xmin) {
                   1365:       $xmax=$xmin+20;
                   1366:    }
                   1367:    if ($ymax<=$ymin) {
                   1368:       $ymax=$ymin+20;
                   1369:    }
                   1370:    return ($xmin,$xmax,$ymin,$ymax);
                   1371: }
                   1372: 
1.37      www      1373: sub start_functionplotelements {
                   1374:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
                   1375:    my $result='';
                   1376:    my $id=$Apache::inputtags::response[-1];
                   1377:    my $partid=$Apache::inputtags::part;
                   1378:    my $internalid = $partid.'_'.$id;
                   1379: 
                   1380:    if ($target eq 'edit') {
                   1381:       return &Apache::edit::start_table($token).
                   1382:         '<tr><td><span class="LC_nobreak">'.&mt('Function Plot Elements').'</span></td>'
                   1383:        .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
                   1384:        .&Apache::edit::deletelist($target,$token).'&nbsp;&nbsp;&nbsp;'.
1.50      www      1385:         &Apache::edit::insertlist($target,$token).'&nbsp;&nbsp;&nbsp;'
                   1386:        .&Apache::loncommon::help_open_topic('Function_Plot_Response_Elements','Function Plot Elements')
1.37      www      1387:        .'</span></td>'
                   1388:        ."<td>&nbsp;"
                   1389:        .&Apache::edit::end_row()
                   1390:        .&Apache::edit::start_spanning_row()
                   1391:        ."\n";
                   1392:    } elsif ($target eq 'web') {
1.41      www      1393:       my ($xmin,$xmax,$ymin,$ymax)=&boundaries($parstack,$safeeval,-2);
1.37      www      1394:       my $xaxisvisible=(&Apache::lonxml::get_param('xaxisvisible',$parstack,$safeeval,-2)=~/on|true|yes|1/i?'true':'false');
                   1395:       my $yaxisvisible=(&Apache::lonxml::get_param('yaxisvisible',$parstack,$safeeval,-2)=~/on|true|yes|1/i?'true':'false');
                   1396:       my $gridvisible=(&Apache::lonxml::get_param('gridvisible',$parstack,$safeeval,-2)=~/on|true|yes|1/i?'true':'false');
                   1397:       my $xlabel=&Apache::lonxml::get_param('xlabel',$parstack,$safeeval,-2);
                   1398:       my $ylabel=&Apache::lonxml::get_param('ylabel',$parstack,$safeeval,-2);
                   1399: 
                   1400: 
                   1401: # paste in the update routine to receive stuff back from the applet
                   1402:      $result.=&update_script($internalid);
                   1403: # start the initscript for this applet
                   1404:      $result.=&start_init_script($internalid);
                   1405: # put the axis commands inside
                   1406:      $result.=&axes_script($internalid,$xmin,$xmax,$ymin,$ymax,$xaxisvisible,$yaxisvisible,$gridvisible);
1.45      www      1407:      $result.=&axes_label($internalid,$xmin,$xmax,$ymin,$ymax,$xlabel,$ylabel);
1.37      www      1408: # init script is left open
                   1409:   }
                   1410:   return $result;
                   1411: }
                   1412: 
1.1       www      1413: 1;
                   1414: 
                   1415: __END__
                   1416:  
                   1417: =head1 NAME
                   1418: 
                   1419: Apache::functionplotresponse.pm;
                   1420: 
                   1421: =head1 SYNOPSIS
                   1422: 
                   1423: Handles tags associated with accepting function plots.
                   1424: 
                   1425: This is part of the LearningOnline Network with CAPA project
                   1426: described at http://www.lon-capa.org.
                   1427: 
                   1428: =head1 HANDLER SUBROUTINE
                   1429: 
                   1430: start_functionplotresponse()
                   1431: 
                   1432: =head1 OTHER SUBROUTINES
                   1433: 
                   1434: =over
                   1435: 
                   1436: =item end_functionplotresponse()
                   1437: 
                   1438: =back
                   1439: 
                   1440: =cut

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