Annotation of loncom/homework/functionplotresponse.pm, revision 1.40
1.1 www 1: # LearningOnline Network with CAPA
2: # option list style responses
3: #
1.40 ! www 4: # $Id: functionplotresponse.pm,v 1.39 2010/11/19 15:41:28 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;
1.36 www 34:
1.1 www 35: BEGIN {
1.37 www 36: &Apache::lonxml::register('Apache::functionplotresponse',('functionplotresponse','backgroundplot','spline',
37: 'functionplotrule','functionplotruleset',
38: 'functionplotelements'));
1.1 www 39: }
40:
1.5 www 41: #
42: # There can be a number of applets on a page, each called ggbApplet_$id,
43: # where $id is the "_"-concatenated part and responseid
44: #
45:
1.1 www 46: sub geogebra_startcode {
1.3 www 47: my ($id)=@_;
1.1 www 48: return (<<ENDSTARTCODE);
1.3 www 49: <applet name="ggbApplet_$id" code="geogebra.GeoGebraApplet" archive="geogebra.jar"
1.40 ! www 50: codebase="/adm/geogebra/" width="722" height="447" MAYSCRIPT>
1.1 www 51: <param name="java_arguments" value="-Xmx512m -Djnlp.packEnabled=true"/>
52: ENDSTARTCODE
53: }
54:
55: sub geogebra_endcode {
1.2 www 56: return &Apache::lonhtmlcommon::java_not_enabled()."</applet>\n";
57: }
58:
1.5 www 59: #
60: # This is the internal GeoGebra bytecode which defines the spline functions
61: #
1.2 www 62: sub geogebra_spline_program {
63: return (<<ENDSPLINEPROGRAM);
64: <param name="ggbBase64" value="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"/>
65: ENDSPLINEPROGRAM
66: }
67:
1.5 www 68: #
69: # The standard set of parameters inside <applet>
70: #
1.2 www 71: sub geogebra_default_parameters {
1.3 www 72: my ($id)=@_;
1.2 www 73: return(<<ENDDEFAULTPARAMETERS);
74: <param name="image" value="/adm/lonIcons/lonanim.gif" />
75: <param name="boxborder" value="false" />
76: <param name="centerimage" value="true" />
1.39 www 77: <param name="cache_archive" value="geogebra.jar, geogebra_main.jar, geogebra_gui.jar, geogebra_cas.jar, geogebra_algos.jar, geogebra_export.jar, geogebra_javascript.jar, jlatexmath.jar, jlm_greek.jar, jlm_cyrillic.jar, geogebra_properties.jar" />
78: <param name="cache_version" value="3.9.115.0, 3.9.115.0, 3.9.115.0, 3.9.115.0, 3.9.115.0, 3.9.115.0, 3.9.115.0, 3.9.115.0, 3.9.115.0, 3.9.115.0, 3.9.115.0" />
1.2 www 79: <param name="framePossible" value="false" />
80:
81: <param name="showResetIcon" value="false" />
82: <param name="showAnimationButton" value="false" />
83: <param name="enableRightClick" value="false" />
84: <param name="errorDialogsActive" value="true" />
85: <param name="enableLabelDrags" value="false" />
86: <param name="showMenuBar" value="false" />
87: <param name="showToolBar" value="false" />
88: <param name="showToolBarHelp" value="false" />
89: <param name="showAlgebraInput" value="false" />
90: <param name="enableShiftDragZoom" value="false" />
91: <param name="allowRescaling" value="false" />
92: <param name="enableLabelDrags" value="false" />
1.3 www 93: <param name="ggbOnInitParam" value="applet_$id" />
1.2 www 94: ENDDEFAULTPARAMETERS
1.1 www 95: }
96:
1.5 www 97: #
98: # This subroutine is called by LON-CAPA at </problem>
99: # Each applet on the page will call function ggbOnInit when it is done loading
100: # This function in turn will call the respective function registered by start_init_script
101: # Which one of the registered functions is called is determined by ggbOnInitParam, which GeoGebra passes to ggbOnInit
102: #
103:
1.3 www 104: sub init_script {
1.16 www 105: if ($#Apache::functionplotresponse::callscripts>=0) {
106: my $script='';
107: foreach my $id (@Apache::functionplotresponse::callscripts) {
108: $script.="if (param=='applet_$id') { loaded_$id=true; }\n";
109: }
110: $script.="if (".join(' && ',map { "loaded_$_" } (@Apache::functionplotresponse::callscripts)).
1.17 www 111: ") { setTimeout('ggbInitAll()',20) }";
1.16 www 112: my $calls=join("\n",map { "ggbInit_$_();" } (@Apache::functionplotresponse::callscripts));
1.3 www 113: return (<<ENDGGBINIT);
114: <script type="text/javascript">
115: // <![CDATA[
1.16 www 116: // Function that each applet will call when loaded
117: // It will pass "its" parameter
118: // Set flags for when an applet is loaded, wait till all are loaded, and then some
1.3 www 119: function ggbOnInit(param) {
1.16 www 120: $script
121: }
122: function ggbInitAll() {
1.17 www 123: $calls
1.3 www 124: }
125: // ]]>
126: </script>
127: ENDGGBINIT
128: }
129: }
130:
1.5 www 131: #
132: # Each Geogebra applet is supposed to call this when parameters change
1.10 www 133: # Changes the hidden fields on the web page
1.5 www 134: #
135: sub update_script {
136: my ($id)=@_;
137: return (<<ENDUPDATESCRIPT);
138: <script type="text/javascript">
139: // <![CDATA[
140: function updatePointCoordinates_$id(coordinateName) {
141: var x = document.ggbApplet_$id.getXcoord(coordinateName);
142: var y = document.ggbApplet_$id.getYcoord(coordinateName);
1.9 www 143: document.lonhomework.elements["HWVAL_$id\_" + coordinateName + "_x"].value = x;
144: document.lonhomework.elements["HWVAL_$id\_" + coordinateName + "_y"].value = y;
1.5 www 145: }
146: // ]]>
147: </script>
148: ENDUPDATESCRIPT
149: }
150:
151: #
152: # Register the above update-handler for a variable
153: #
154:
155: sub update_register {
156: my ($id,$variable)=@_;
1.6 www 157: return "document.ggbApplet_$id.registerObjectUpdateListener('$variable','updatePointCoordinates_$id');\n";
158: }
159:
160: #
1.40 ! www 161: # Set a point coordinate variable
1.6 www 162: #
1.40 ! www 163: sub set_point_coordinate {
1.6 www 164: my ($id,$variable,$x,$y)=@_;
165: return (<<ENDSETVARIABLE);
1.9 www 166: document.ggbApplet_$id.evalCommand("$variable=($x,$y)");
1.40 ! www 167: document.ggbApplet_$id.setLabelVisible("$variable",false);
1.6 www 168: ENDSETVARIABLE
169: }
170:
171: #
1.40 ! www 172: # Set a slope coordinate variable
! 173: #
! 174: sub set_slope_coordinate {
! 175: my ($id,$variable,$xrel,$yrel,$xmin,$xmax,$ymin,$ymax,$pointname)=@_;
! 176: my $xvariable=$variable.'x';
! 177: my $yvariable=$variable.'y';
! 178: my $domain=$xmax-$xmin;
! 179: my $range=$ymax-$ymin;
! 180: my $xinterval=$domain/100.;
! 181: my $yinterval=$range/200.;
! 182: return (<<ENDSETSVARIABLE);
! 183: document.ggbApplet_$id.evalCommand("$xvariable=Slider[0,$domain,$xinterval]");
! 184: document.ggbApplet_$id.setVisible("$xvariable", false);
! 185: document.ggbApplet_$id.evalCommand("$xvariable=$xrel");
! 186: document.ggbApplet_$id.evalCommand("$yvariable=Slider[-$range,$range,$yinterval]");
! 187: document.ggbApplet_$id.setVisible("$yvariable", false);
! 188: document.ggbApplet_$id.evalCommand("$yvariable=$yrel");
! 189: document.ggbApplet_$id.evalCommand("$variable=($xvariable+x($pointname),$yvariable+y($pointname))");
! 190: document.ggbApplet_$id.setLabelVisible("$variable", false);
! 191: ENDSETSVARIABLE
! 192: }
! 193:
! 194: #
1.9 www 195: # Input field name for a coordinate variable
196: #
197:
198: sub field_name {
199: my ($id,$variable,$name)=@_;
200: return "HWVAL_$id\_$variable\_$name";
201: }
202:
203: #
204: # Generate an input field for a coordinate variable
205: #
206:
207: sub generate_input_field {
208: my ($id,$variable,$x,$y)=@_;
209: $Apache::functionplotresponse::inputfields.=
210: "<input type='hidden' name='".&field_name($id,$variable,'x')."' value='$x' />\n".
211: "<input type='hidden' name='".&field_name($id,$variable,'y')."' value='$y' />\n";
212: }
213:
214: #
1.40 ! www 215: # Initialize a new point coordinate variable at set a listener on it
1.6 www 216: #
1.40 ! www 217: sub new_point_coordinate {
1.6 www 218: my ($id,$variable,$x,$y)=@_;
1.11 www 219: if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'x')})) {
1.10 www 220: $x=$Apache::functionplotresponse::previous{&field_name($id,$variable,'x')};
221: }
1.11 www 222: if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'y')})) {
1.10 www 223: $y=$Apache::functionplotresponse::previous{&field_name($id,$variable,'y')};
224: }
1.9 www 225: &generate_input_field($id,$variable,$x,$y);
1.40 ! www 226: return &set_point_coordinate($id,$variable,$x,$y).&update_register($id,$variable);
! 227: }
! 228:
! 229: #
! 230: # Initialize a new slope coordinate variable at set a listener on it
! 231: #
! 232: sub new_slope_coordinate {
! 233: my ($id,$variable,$x,$y,$pointname,$xp,$yp,$xmin,$xmax,$ymin,$ymax)=@_;
! 234: #
! 235: # $variable: name of the slope point
! 236: # $x, $y: coordinates of the slope point
! 237: # $pointname: name of the associated point point
! 238: # $xp $yp: coordinates of the point point
! 239: #
! 240: if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'x')})) {
! 241: $x=$Apache::functionplotresponse::previous{&field_name($id,$variable,'x')};
! 242: }
! 243: if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'y')})) {
! 244: $y=$Apache::functionplotresponse::previous{&field_name($id,$variable,'y')};
! 245: }
! 246: if (defined($Apache::functionplotresponse::previous{&field_name($id,$pointname,'x')})) {
! 247: $xp=$Apache::functionplotresponse::previous{&field_name($id,$pointname,'x')};
! 248: }
! 249: if (defined($Apache::functionplotresponse::previous{&field_name($id,$pointname,'y')})) {
! 250: $yp=$Apache::functionplotresponse::previous{&field_name($id,$pointname,'y')};
! 251: }
! 252:
! 253: &generate_input_field($id,$variable,$x,$y);
! 254: my $xrel=$x-$xp;
! 255: my $yrel=$y-$yp;
! 256: return &set_slope_coordinate($id,$variable,$xrel,$yrel,$xmin,$xmax,$ymin,$ymax,$pointname).&update_register($id,$variable);
1.5 www 257: }
258:
259: #
260: # This registers the init-function call for ggbOnInit, which LON-CAPA will place at </problem>
261: # It then starts the right headers
262: #
1.3 www 263: sub start_init_script {
264: my ($id)=@_;
1.16 www 265: # Add id to the list of ggbInit_$id functions that need to be called
266: push(@Apache::functionplotresponse::callscripts,$id);
1.5 www 267: # ... and open this function
1.3 www 268: return (<<ENDSTARTINIT);
269: <script type="text/javascript">
270: // <![CDATA[
1.5 www 271: // variable that will eventually be passed back to the server
272: var coordinateMap_$id = [];
1.16 www 273: // flag for not loaded yet
274: var loaded_$id=false;
1.5 www 275: // Init-function for applet
1.3 www 276: function ggbInit_$id() {
277: ENDSTARTINIT
278: }
279:
1.5 www 280: #
281: # This sets the axes inside ggbInit_$id
282: #
283:
1.4 www 284: sub axes_script {
285: my ($id,$xmin,$xmax,$ymin,$ymax,$xvisible,$yvisible,$gvisible)=@_;
286: return (<<ENDAXESSCRIPT);
287: // changes (xmin, xmax, ymin, ymax)
288: document.ggbApplet_$id.setCoordSystem($xmin,$xmax,$ymin,$ymax);
289:
290: // makes the (x,y) axis (in)visible
291: document.ggbApplet_$id.setAxesVisible($xvisible,$yvisible);
292: // makes the grid (in)visible
293: document.ggbApplet_$id.setGridVisible($gvisible);
294: ENDAXESSCRIPT
295: }
296:
1.14 www 297: sub axes_label {
298: my ($id,$xlabel,$ylabel)=@_;
299: unless ($xlabel || $ylabel) { return ''; }
300: my $return='document.ggbApplet_'.$id.'.evalCommand("topRight=Corner[3]");';
301: if ($xlabel) {
302: $return.=(<<ENDXAXISLABELSCRIPT);
303: document.ggbApplet_$id.evalCommand("Xlabel=(x(topRight)-AxisStepX[],AxisStepY[]/6)");
304: document.ggbApplet_$id.setVisible("Xlabel",false);
305: document.ggbApplet_$id.evalCommand("Text[\\"$xlabel\\", Xlabel]");
306: ENDXAXISLABELSCRIPT
307: }
308: if ($ylabel) {
309: $return.=(<<ENDYAXISLABELSCRIPT);
310: document.ggbApplet_$id.evalCommand("Ylabel=(AxisStepX[]/6,y(topRight)-AxisStepY[]/3)");
311: document.ggbApplet_$id.setVisible("Ylabel",false);
312: document.ggbApplet_$id.evalCommand("Text[\\"$ylabel\\", Ylabel]");
313: ENDYAXISLABELSCRIPT
314: }
315: return $return;
316: }
317:
1.4 www 318: sub plot_script {
1.6 www 319: my ($id,$function,$fixed)=@_;
320: if ($fixed) {
321: # Use stupid trick to nail this to a location
1.14 www 322: # Oddly, it seems like only one plot cannot be nailed to a location
323: # Non-nailed-down plots apparently get overwritten
1.6 www 324: return (<<ENDPLOTSCRIPT);
325: document.ggbApplet_$id.evalCommand("a=1");
326: document.ggbApplet_$id.setVisible("a",false);
327: // This MUST be a DEPENDENT OBJECT in order to be locked down:
328: document.ggbApplet_$id.evalCommand("y=a*($function)");
1.4 www 329: ENDPLOTSCRIPT
1.6 www 330: } else {
331: return "document.ggbApplet_$id.evalCommand('y=$function')";
332: }
1.4 www 333: }
334:
1.5 www 335: #
1.7 www 336: # Subroutine that generates code for spline $label based on stored information
1.6 www 337: #
338:
339: sub generate_spline {
1.40 ! www 340: my ($id,$label,$xmin,$xmax,$ymin,$ymax)=@_;
1.6 www 341: my $result='';
1.7 www 342: my $order=$Apache::functionplotresponse::splineorder{$label};
343: my $x=$Apache::functionplotresponse::splineinitx{$label};
344: my $y=$Apache::functionplotresponse::splineinity{$label};
345: my $sx=$Apache::functionplotresponse::splinescalex{$label};
346: my $sy=$Apache::functionplotresponse::splinescaley{$label};
347: my @coords=();
348: foreach my $i (1..$order) {
1.40 ! www 349: $result.=&new_point_coordinate($id,$label.'P'.$i,$x,$y);
! 350: my $xp=$x;
1.8 www 351: $x+=$sx/(2.*($order-1));
1.7 www 352: push(@coords,$label.'P'.$i);
1.40 ! www 353: $result.=&new_slope_coordinate($id,$label.'S'.$i,$x,$y+$sy,$label.'P'.$i,$xp,$y,$xmin,$xmax,$ymin,$ymax);
1.8 www 354: $x+=$sx/(2.*($order-1));
1.7 www 355: push(@coords,$label.'S'.$i);
356: }
357: $result.='document.ggbApplet_'.$id.'.evalCommand("Spline'.$order.'['.join(',',@coords).']");'."\n";
1.6 www 358: return $result;
359: }
360: #
361: # <backgroundplot function="..." fixed="yes/no" />
1.5 www 362: #
1.4 www 363: sub start_backgroundplot {
364: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
365: my $result='';
366: my $internalid = $Apache::inputtags::part.'_'.$Apache::inputtags::response[-1];
367: my $function=&Apache::lonxml::get_param('function',$parstack,$safeeval);
1.6 www 368: my $fixed=(&Apache::lonxml::get_param('fixed',$parstack,$safeeval)=~/on|true|yes|1/i?1:0);
369:
1.4 www 370: unless ($function) { $function="0"; }
371: if ($target eq 'web') {
1.6 www 372: $result.=&plot_script($internalid,$function,$fixed);
1.13 www 373: } elsif ($target eq 'edit') {
374: $result=&Apache::edit::tag_start($target,$token,'Background Function Plot').
375: &Apache::edit::text_arg('Function:','function',
376: $token,'16').
377: &Apache::edit::select_arg('Fixed location:','fixed',
378: ['yes','no'],$token).
379: &Apache::edit::end_row();
380: } elsif ($target eq 'modified') {
381: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
382: $safeeval,'function','fixed');
383: if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
384: }
385: return $result;
1.4 www 386: }
387:
388: sub end_backgroundplot {
1.13 www 389: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
390: my $result='';
391: if ($target eq 'edit') {
392: $result=&Apache::edit::end_table();
393: }
394: return $result;
1.6 www 395: }
396:
397: #
1.25 www 398: # <functionplotrule ... />
1.12 www 399: #
1.25 www 400: sub start_functionplotrule {
1.12 www 401: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
402: my $result='';
1.24 www 403: my $label=&Apache::lonxml::get_param('index',$parstack,$safeeval);
404: $Apache::functionplotresponse::counter++;
405: if ($label=~/\W/) {
1.25 www 406: &Apache::lonxml::warning(&mt('Rule indices should only contain alphanumeric characters.'));
1.24 www 407: }
408: $label=~s/\W//gs;
409: unless ($label) {
410: $label='R'.$Apache::functionplotresponse::counter;
411: } else {
412: $label='R'.$label;
413: }
414: if ($Apache::functionplotresponse::splineorder{$label}) {
1.25 www 415: &Apache::lonxml::error(&mt('Rule indices must be unique.'));
1.24 www 416: }
417:
418:
419: if ($target eq 'grade') {
420: # Simply remember - in order - for later
1.25 www 421: my $beginninglabel=&Apache::lonxml::get_param('xinitiallabel',$parstack,$safeeval);
422: my $endinglabel=&Apache::lonxml::get_param('xfinallabel',$parstack,$safeeval);
1.24 www 423: if (($beginninglabel=~/\W/) || ($endinglabel=~/W/)) {
1.25 www 424: &Apache::lonxml::warning(&mt('Rule labels must be alphanumeric.'));
1.24 www 425: }
426: $beginninglabel=~s/\W//gs;
427: $endinglabel=~s/\W//gs;
428: my $relationship=&Apache::lonxml::get_param('relationship',$parstack,$safeeval);
429: $relationship=~s/\W//gs;
430: $relationship=lc($relationship);
431: unless ($relationship=~/^(eq|ge|gt|le|lt|ne)$/) {
1.25 www 432: &Apache::lonxml::warning(&mt('Rule relationship not defined.'));
1.24 www 433: $relationship='eq';
434: }
1.35 www 435: my $derivative=&Apache::lonxml::get_param('derivativeorder',$parstack,$safeeval);
1.24 www 436: unless (($derivative==0) || ($derivative==1) || ($derivative==2)) {
1.25 www 437: &Apache::lonxml::warning(&mt('Rule derivative not defined.'));
1.24 www 438: $derivative=0;
439: }
1.25 www 440: push(@Apache::functionplotresponse::functionplotrules,join(':',(
1.24 www 441: $label,
442: $derivative,
1.25 www 443: &Apache::lonxml::get_param('xinitial',$parstack,$safeeval),
1.24 www 444: $beginninglabel,
1.25 www 445: &Apache::lonxml::get_param('xfinal',$parstack,$safeeval),
1.24 www 446: $endinglabel,
1.35 www 447: &Apache::lonxml::get_param('minimumlength',$parstack,$safeeval),
448: &Apache::lonxml::get_param('maximumlength',$parstack,$safeeval),
1.24 www 449: $relationship,
1.33 www 450: &Apache::lonxml::get_param('value',$parstack,$safeeval),
451: &Apache::lonxml::get_param('percenterror',$parstack,$safeeval)
1.24 www 452: )));
453: } elsif ($target eq 'edit') {
1.29 www 454: $result=&Apache::edit::tag_start($target,$token,'Function Plot Evaluation Rule').
1.36 www 455: &Apache::edit::text_arg('Index/Name:','index',
456: $token,'10').' '.
1.35 www 457: &Apache::edit::select_arg(&mt('Function:'),'derivativeorder',
1.29 www 458: [['0','Function itself'],
459: ['1','First derivative'],
1.32 www 460: ['2','Second derivative']],$token).'<br />'.
1.29 www 461: &Apache::edit::text_arg('(Initial) x-value:','xinitial',
1.35 www 462: $token,'8').
1.30 www 463: &Apache::edit::select_or_text_arg('(Initial) x-value label:','xinitiallabel',
1.32 www 464: [['start','Start of Plot']],$token,'8').'<br />'.
1.30 www 465:
466: &Apache::edit::text_arg('Optional final x-value for ranges:','xfinal',
1.35 www 467: $token,'8').
1.30 www 468: &Apache::edit::select_or_text_arg('Optional final x-value label:','xfinallabel',
1.32 www 469: [['end','End of Plot']],$token,'8').'<br />'.
1.35 www 470: &Apache::edit::text_arg('Optional minimum length for range:','minimumlength',
471: $token,'8').
472: &Apache::edit::text_arg('Optional maximum length for range:','maximumlength',
473: $token,'8').'<br />'.
1.38 www 474: &Apache::edit::select_or_text_arg(&mt('Relationship:'),'relationship',
1.29 www 475: [['eq','equal'],
476: ['ne','not equal'],
477: ['ge','greater than or equal'],
478: ['gt','greater than'],
479: ['lt','less than'],
480: ['le','less than or equal']],$token).
481: $result.= &Apache::edit::select_or_text_arg('Value:','value',
1.35 www 482: [['undef','not defined']],$token,'8').
1.29 www 483: &Apache::edit::text_arg('Percent error:','percenterror',
1.35 www 484: $token,'8').
1.29 www 485: &Apache::edit::end_row();
486: } elsif ($target eq 'modified') {
487: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.35 www 488: $safeeval,'index','derivativeorder',
489: 'xinitial','xinitiallabel','xfinal','xfinallabel',
490: 'minimumlength','maximumlength',
491: 'relationship','value','percenterror');
1.29 www 492: if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
1.13 www 493: }
1.12 www 494: return $result;
495: }
496:
1.25 www 497: sub end_functionplotrule {
1.13 www 498: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
499: my $result='';
500: if ($target eq 'edit') {
501: $result=&Apache::edit::end_table();
502: }
503: return $result;
1.12 www 504: }
505:
506:
507: #
1.23 www 508: # <spline index="..." order="1,2,3,4" initx="..." inity="..." scalex="..." scaley="..." />
1.6 www 509: #
510: # Unfortunately, GeoGebra seems to want all splines after everything else, so we need to store them
511: #
512: sub start_spline {
513: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1.13 www 514: my $result='';
515: if ($target eq 'web') {
1.23 www 516: my $label=&Apache::lonxml::get_param('index',$parstack,$safeeval);
1.13 www 517: $Apache::functionplotresponse::counter++;
518: if ($label=~/\W/) {
1.23 www 519: &Apache::lonxml::warning(&mt('Spline indices should only contain alphanumeric characters.'));
1.13 www 520: }
521: $label=~s/\W//gs;
1.23 www 522: unless ($label) {
523: $label='S'.$Apache::functionplotresponse::counter;
524: } else {
525: $label='S'.$label;
526: }
1.13 www 527: if ($Apache::functionplotresponse::splineorder{$label}) {
1.23 www 528: &Apache::lonxml::error(&mt('Spline indices must be unique.'));
1.13 www 529: }
530:
531: my $order=&Apache::lonxml::get_param('order',$parstack,$safeeval);
532: if ($order<2) { $order=2; }
533: if ($order>8) { $order=8; }
534: $Apache::functionplotresponse::splineorder{$label}=$order;
535:
536: my $x=&Apache::lonxml::get_param('initx',$parstack,$safeeval);
537: unless ($x) { $x=0; }
538: $Apache::functionplotresponse::splineinitx{$label}=$x;
539:
540: my $y=&Apache::lonxml::get_param('inity',$parstack,$safeeval);
541: unless ($y) { $y=0; }
542: $Apache::functionplotresponse::splineinity{$label}=$y;
543:
544: my $sx=&Apache::lonxml::get_param('scalex',$parstack,$safeeval);
545: unless ($sx) { $sx=$order; }
546: $Apache::functionplotresponse::splinescalex{$label}=$sx;
547:
548: my $sy=&Apache::lonxml::get_param('scaley',$parstack,$safeeval);
549: unless ($sy) { $sy=2; }
550: $Apache::functionplotresponse::splinescaley{$label}=$sy;
551: } elsif ($target eq 'edit') {
552: $result=&Apache::edit::tag_start($target,$token,'Spline').
1.23 www 553: &Apache::edit::text_arg('Index:','index',
1.14 www 554: $token,'4').' '.
1.13 www 555: &Apache::edit::select_arg('Order:','order',
1.14 www 556: ['2','3','4','5','6','7','8','9'],$token).' '.
1.13 www 557: &Apache::edit::text_arg('Initial x-value:','initx',
1.14 www 558: $token,'4').' '.
1.13 www 559: &Apache::edit::text_arg('Initial y-value:','inity',
1.14 www 560: $token,'4').' '.
1.13 www 561: &Apache::edit::text_arg('Scale x:','scalex',
1.14 www 562: $token,'4').' '.
1.13 www 563: &Apache::edit::text_arg('Scale y:','scaley',
564: $token,'4').
565: &Apache::edit::end_row();
566: } elsif ($target eq 'modified') {
567: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.23 www 568: $safeeval,'index','order','initx','inity',
1.13 www 569: 'scalex','scaley');
570: if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
571: }
572: return $result;
1.6 www 573: }
574:
575: sub end_spline {
1.13 www 576: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
577: my $result='';
578: if ($target eq 'edit') {
579: $result=&Apache::edit::end_table();
580: }
581: return $result;
1.4 www 582: }
583:
1.3 www 584: sub end_init_script {
585: return (<<ENDENDINIT);
586: }
587: // ]]>
588: </script>
589: ENDENDINIT
590: }
591:
1.10 www 592: #
593: # Storing and restoring spline coordinates from part answers
594: #
595: sub decode_previous_answer {
596: my ($answer)=@_;
597: foreach my $coordinate (split(/\,/,$answer)) {
598: my ($key,$value)=split(/\=/,$coordinate);
599: $Apache::functionplotresponse::previous{$key}=$value;
600: }
601: }
602:
603: sub get_answer_from_form_fields {
604: my ($id)=@_;
605: my $answer='';
606: my %coords=();
607: foreach my $field (keys(%env)) {
608: if ($field=~/^form\.HWVAL\_$id/) {
609: $field=~/^form\.(.*)$/;
610: $coords{$1}=$env{$field};
611: }
612: }
613: $answer=join(',',map { $_.'='.$coords{$_} } (sort(keys(%coords))));
614: return ($answer,%coords);
615: }
616:
1.15 www 617: #
618: # The following functions calculate the cubic-hermite splines server-side
619: #
620:
621: sub cubic_hermite {
622: my ($t,$p1,$s1,$p2,$s2)=@_;
623: return (2.*$t*$t*$t-3.*$t*$t+1.)*$p1 + 5.*($t*$t*$t-2.*$t*$t+$t)*($s1-$p1)+
624: (-2.*$t*$t*$t+3.*$t*$t) *$p2 + 5.*($t*$t*$t-$t*$t) *($s2-$p2);
625: }
626:
627: #
628: # d/dt(...)
629: #
630:
631: sub ddt_cubic_hermite {
632: my ($t,$p1,$s1,$p2,$s2)=@_;
633: return (6.*$t*$t-6.*$t) *$p1 + 5.*(3.*$t*$t-4.*$t+1.)*($s1-$p1)+
634: (-6.*$t*$t+6.*$t)*$p2 + 5.*(3.*$t*$t-2.*$t) *($s2-$p2);
635: }
636:
637: #
638: # d^2/dt^2(...)
639: #
640:
641: sub d2dt2_cubic_hermite {
642: my ($t,$p1,$s1,$p2,$s2)=@_;
643: return (12.*$t-6.) *$p1 + 5.*(6.*$t-4.)*($s1-$p1)+
644: (-12.*$t+6.)*$p2 + 5.*(6.*$t-2.)*($s2-$p2);
645: }
646:
647: #
1.18 www 648: # Array index calculation
649: #
650: sub array_index {
651: my ($xmin,$xmax,$x)=@_;
1.38 www 652: if ($x ne '') {
653: return int(($x-$xmin)/($xmax-$xmin)*400.+0.5);
654: } else {
655: return undef;
656: }
1.20 www 657: }
658:
659: #
1.18 www 660: # Populate the arrays
661: #
662:
663: sub populate_arrays {
664: my ($id,$xmin,$xmax)=@_;
1.26 www 665: for (my $i=0; $i<=400; $i++) {
1.35 www 666: $Apache::functionplotresponse::actualxval[$i]=undef;
1.19 www 667: $Apache::functionplotresponse::func[$i]=undef;
1.22 www 668: $Apache::functionplotresponse::dfuncdx[$i]=undef;
1.19 www 669: $Apache::functionplotresponse::d2funcd2x[$i]=undef;
1.18 www 670: }
1.19 www 671: unless ($xmax>$xmin) { return 'no_func'; }
1.18 www 672: # Run over all splines in response
673: foreach my $label (split(/\,/,$env{"form.HWVAL_AllSplines_$id"})) {
1.19 www 674: my $xiold=-1;
1.18 www 675: # Run over all points in spline
1.19 www 676: for (my $i=1; $i<$env{"form.HWVAL_SplineOrder_".$id."_".$label}; $i++) {
1.18 www 677: my $ni=$i+1;
678: my @xparms=($env{'form.HWVAL_'.$id.'_'.$label.'P'.$i.'_x'},
679: $env{'form.HWVAL_'.$id.'_'.$label.'S'.$i.'_x'},
680: $env{'form.HWVAL_'.$id.'_'.$label.'P'.$ni.'_x'},
681: $env{'form.HWVAL_'.$id.'_'.$label.'S'.$ni.'_x'});
682: my @yparms=($env{'form.HWVAL_'.$id.'_'.$label.'P'.$i.'_y'},
683: $env{'form.HWVAL_'.$id.'_'.$label.'S'.$i.'_y'},
684: $env{'form.HWVAL_'.$id.'_'.$label.'P'.$ni.'_y'},
685: $env{'form.HWVAL_'.$id.'_'.$label.'S'.$ni.'_y'});
686: # Run in small steps over spline parameter
1.26 www 687: for (my $t=0; $t<=1; $t+=0.0001) {
1.35 www 688: my $xreal=&cubic_hermite($t,@xparms);
689: my $xi=&array_index($xmin,$xmax,$xreal);
1.19 www 690: if ($xi<$xiold) { return 'no_func'; }
1.26 www 691: if (($xi>$xiold) && ($xi>=0) && ($xi<=400)) {
1.19 www 692: if (defined($Apache::functionplotresponse::func[$xi])) { return 'no_func'; }
1.18 www 693: $xiold=$xi;
1.35 www 694: $Apache::functionplotresponse::actualxval[$xi]=$xreal;
1.22 www 695: # Function value
1.30 www 696: my $funcval=&cubic_hermite($t,@yparms);
697: $Apache::functionplotresponse::func[$xi]=$funcval;
698: if (defined($funcval)) {
699: if ($xi<$Apache::functionplotresponse::functionplotrulelabels{'start'}) {
700: $Apache::functionplotresponse::functionplotrulelabels{'start'}=$xi;
701: }
702: if ($xi>$Apache::functionplotresponse::functionplotrulelabels{'end'}) {
703: $Apache::functionplotresponse::functionplotrulelabels{'end'}=$xi;
704: }
705: }
1.28 www 706: # Chain rule
1.22 www 707: # dy/dx=dy/dt/(dx/dt)
708: my $dxdt=&ddt_cubic_hermite($t,@xparms);
709: if ($dxdt) {
710: $Apache::functionplotresponse::dfuncdx[$xi]=&ddt_cubic_hermite($t,@yparms)/$dxdt;
1.34 www 711: # Second derivative
1.28 www 712: $Apache::functionplotresponse::d2funcdx2[$xi]=
1.34 www 713: ($dxdt*&d2dt2_cubic_hermite($t,@yparms)-&ddt_cubic_hermite($t,@yparms)*&d2dt2_cubic_hermite($t,@xparms))/
714: ($dxdt*$dxdt*$dxdt);
1.22 www 715: }
1.18 www 716: }
717: }
718: }
719: }
720: }
721:
722: #
1.37 www 723: # Implementation of <functionplotresponse>
1.15 www 724: #
725:
1.1 www 726: sub start_functionplotresponse {
727: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
728: my $result='';
1.6 www 729: # To remember the splines - somehow, they need to come last
730: undef %Apache::functionplotresponse::splineorder;
731: undef %Apache::functionplotresponse::splineinitx;
732: undef %Apache::functionplotresponse::splineinity;
733: undef %Apache::functionplotresponse::splinescalex;
734: undef %Apache::functionplotresponse::splinescaley;
1.10 www 735: # Remember input fields, etc
736: undef %Apache::functionplotresponse::previous;
1.9 www 737: $Apache::functionplotresponse::inputfields='';
1.6 www 738: $Apache::functionplotresponse::counter=0;
1.24 www 739: # Remember rules
1.25 www 740: undef @Apache::functionplotresponse::functionplotrules;
1.37 www 741: # Remember failed rules
742: if ($target eq 'grade') {
743: undef @Apache::functionplotresponse::failedrules;
744: }
745: # Delete previous awards
746: undef $Apache::functionplotresponse::awarddetail;
1.10 www 747: # Part and ID
748: my $partid=$Apache::inputtags::part;
749: my $id=&Apache::response::start_response($parstack,$safeeval);
1.6 www 750: # Internal ID to mark the applet and its coordinates
1.10 www 751: my $internalid = $partid.'_'.$id;
752: # Previous answer
753: &decode_previous_answer($Apache::lonhomework::history{"resource.$partid.$id.submission"});
754:
1.6 www 755: # Parameters of <functionplotresponse>
1.3 www 756: my $xmin=&Apache::lonxml::get_param('xmin',$parstack,$safeeval);
1.18 www 757: $xmin=(defined($xmin)?$xmin:-10);
1.3 www 758: my $xmax=&Apache::lonxml::get_param('xmax',$parstack,$safeeval);
1.18 www 759: $xmax=(defined($xmax)?$xmax:10);
1.3 www 760: my $ymin=&Apache::lonxml::get_param('ymin',$parstack,$safeeval);
1.18 www 761: $ymin=(defined($ymin)?$ymin:-10);
1.3 www 762: my $ymax=&Apache::lonxml::get_param('ymax',$parstack,$safeeval);
1.18 www 763: $ymax=(defined($ymax)?$ymax:10);
1.25 www 764: if ($xmax<=$xmin) {
765: &Apache::lonxml::warning('Maximum x-value needs to be larger than minimum value.');
766: $xmax=$xmin+20;
767: }
768: if ($ymax<=$ymin) {
769: &Apache::lonxml::warning('Maximum y-value needs to be larger than minimum value.');
770: $ymax=$ymin+20;
771: }
1.6 www 772: my $xaxisvisible=(&Apache::lonxml::get_param('xaxisvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
773: my $yaxisvisible=(&Apache::lonxml::get_param('yaxisvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
774: my $gridvisible=(&Apache::lonxml::get_param('gridvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
1.14 www 775: my $xlabel=&Apache::lonxml::get_param('xlabel',$parstack,$safeeval);
776: my $ylabel=&Apache::lonxml::get_param('ylabel',$parstack,$safeeval);
1.12 www 777: if ($target eq 'edit') {
778: $result.=&Apache::edit::start_table($token)
779: .'<tr><td><span class="LC_nobreak">'.&mt('Function Plot Question').'</span></td>'
780: .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
1.37 www 781: .&Apache::edit::deletelist($target,$token).' '
782: .&Apache::edit::insertlist($target,$token)
1.12 www 783: .'</span></td>'
784: ."<td> "
785: .&Apache::edit::end_row()
786: .&Apache::edit::start_spanning_row()
787: ."\n";
1.14 www 788: $result.=&Apache::edit::text_arg('Label x-axis:','xlabel',
789: $token,'6').' '.
790: &Apache::edit::text_arg('Minimum x-value:','xmin',
791: $token,'4').' '.
1.12 www 792: &Apache::edit::text_arg('Maximum x-value:','xmax',
1.14 www 793: $token,'4').' '.
1.12 www 794: &Apache::edit::select_arg('x-axis visible:','xaxisvisible',
1.32 www 795: ['yes','no'],$token).'<br />'.
1.14 www 796: &Apache::edit::text_arg('Label y-axis:','ylabel',
797: $token,'6').' '.
1.12 www 798: &Apache::edit::text_arg('Minimum y-value:','ymin',
1.14 www 799: $token,'4').' '.
1.12 www 800: &Apache::edit::text_arg('Maximum y-value:','ymax',
1.14 www 801: $token,'4').' '.
1.12 www 802: &Apache::edit::select_arg('y-axis visible:','yaxisvisible',
1.32 www 803: ['yes','no'],$token).'<br />'.
1.12 www 804: &Apache::edit::select_arg('Grid visible:','gridvisible',
805: ['yes','no'],$token).
806: &Apache::edit::end_row().&Apache::edit::start_spanning_row();
807: } elsif ($target eq 'modified') {
808: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.14 www 809: $safeeval,'xlabel','xmin','xmax','ylabel','ymin','ymax',
1.12 www 810: 'xaxisvisible','yaxisvisible','gridvisible');
811: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.3 www 812:
1.12 www 813: } elsif ($target eq 'meta') {
1.10 www 814: $result=&Apache::response::meta_package_write('functionplotresponse');
1.35 www 815: } elsif (($target eq 'answer') &&
816: ($env{'form.answer_output_mode'} ne 'tex') &&
817: ($Apache::lonhomework::viewgrades == 'F')) {
818: my (undef,undef,$udom,$uname)=&Apache::lonnet::whichuser();
819: my $windowopen=&Apache::lonhtmlcommon::javascript_docopen();
820: my $start_page = &Apache::loncommon::start_page('Rules Log', undef,
821: {'only_body' => 1,
822: 'bgcolor' => '#FFFFFF',
823: 'js_ready' => 1,});
824: my $end_page = &Apache::loncommon::end_page({'js_ready' => 1,});
825: $uname =~s/\W//g;
826: $udom =~s/\W//g;
827: my $function_name =
828: join('_','LONCAPA_scriptvars',$uname,$udom,
829: $env{'form.counter'},$Apache::lonxml::curdepth);
830: my $rules_var ="<script type=\"text/javascript\">
831: // <![CDATA[
832: function $function_name() {newWindow=open('','new_W','width=500,height=500,scrollbars=1,resizable=yes');newWindow.$windowopen;newWindow.document.writeln('$start_page<pre>".
833: $Apache::functionplotresponse::ruleslog.
834: "<\\/pre>$end_page');newWindow.document.close();newWindow.focus()}
835: // ]]>
836: </script><a href=\"javascript:$function_name();void(0);\">".&mt('Rules Log')."</a><br />";
837: &Apache::lonxml::add_script_result($rules_var);
838: }
839:
1.1 www 840: return $result;
841: }
842:
1.25 www 843: sub compare_rel {
1.26 www 844: my ($relationship,$value,$realval,$tol)=@_;
1.36 www 845: # is the real value undefined?
1.26 www 846: unless (defined($realval)) {
1.36 www 847: # the real value is not defined
1.26 www 848: if ($relationship eq 'eq') {
849: if ($value eq 'undef') {
850: return 1;
851: } else {
852: return 0;
853: }
854: } elsif ($relationship eq 'ne') {
855: if ($value eq 'undef') {
856: return 0;
857: } else {
858: return 1;
859: }
860: } else {
861: return 0;
862: }
863: }
864:
1.36 www 865: # is the expected value undefined?
866: if ($value eq 'undef') {
867: # but by now we know that the real value is defined
868: return 0;
869: }
870:
871: # both are defined.
1.26 www 872: if ($relationship eq 'gt') {
873: return ($realval>$value);
874: } elsif ($relationship eq 'ge') {
875: return ($realval>$value-$tol);
876: } elsif ($relationship eq 'lt') {
877: return ($realval<$value);
878: } elsif ($relationship eq 'le') {
879: return ($realval<$value+$tol);
880: } elsif ($relationship eq 'ne') {
881: return (abs($value-$realval)>$tol);
882: } else {
883: return (abs($value-$realval)<$tol);
884: }
1.25 www 885: return 0;
886: }
887:
1.35 www 888: sub addlog {
889: my ($text)=@_;
890: $Apache::functionplotresponse::ruleslog.=$text.'<br />';
891: }
892:
893: sub actualval {
894: my ($i,$xmin,$xmax)=@_;
895: return $xmin+$i/400.*($xmax-$xmin);
896: }
897:
1.25 www 898: sub functionplotrulecheck {
1.33 www 899: my ($rule,$xmin,$xmax,$ymin,$ymax)=@_;
900:
1.35 www 901: my ($label,$derivative,$xinitial,$xinitiallabel,$xfinal,$xfinallabel,$minimumlength,$maximumlength,$relationship,$value,$percent)
1.25 www 902: =split(/\:/,$rule);
1.33 www 903: $percent=($percent>0?$percent:5);
1.35 www 904: &addlog("=================");
905: &addlog("Rule $label for ".('function itself','first derivative','second derivative')[$derivative]." $relationship $value");
1.30 www 906: my $li=0;
907: my $lh=400;
908:
1.31 www 909: # Special case: the upper boundary was not defined
910: # and needs to be set to the value where
911: # the condition is not true anymore => set flag
912:
913: my $findupper=0;
914: if (($xfinal eq '')
915: && (!defined($Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}))
916: && ($xfinallabel)) {
917: $findupper=1;
918: }
919:
1.25 www 920: # if a hard value is set for the boundaries, it overrides the label
1.30 www 921: if (($xinitial ne '') && ($xinitiallabel ne '') && ($xinitiallabel ne 'start')) {
922: $li=&array_index($xmin,$xmax,$xinitial);
923: $Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel}=$li;
924: }
925: if (($xfinal ne '') && ($xfinallabel ne '') && ($xfinallabel ne 'end')) {
926: $lh=&array_index($xmin,$xmax,$xfinal);
927: $Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}=$lh;
1.25 www 928: }
1.31 www 929: # if the label is defined, use it
1.25 www 930: if (defined($Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel})) {
1.35 www 931: &addlog("Using lower label $xinitiallabel");
1.30 www 932: $li=$Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel};
933: } else {
934: $li=&array_index($xmin,$xmax,$xinitial);
1.25 www 935: }
1.31 www 936: unless ($findupper) {
937: if (defined($Apache::functionplotresponse::functionplotrulelabels{$xfinallabel})) {
1.35 www 938: &addlog("Using upper label $xfinallabel");
1.33 www 939: $lh=$Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}-1;
1.31 www 940: } else {
941: $lh=&array_index($xmin,$xmax,$xfinal);
942: }
1.25 www 943: }
944: # Basic sanity checks
1.30 www 945: if ($li<0) { $li=0; }
946: if ($lh>400) { $lh=400; }
1.38 www 947: if (($li>$lh) || (!defined($lh))) {
1.30 www 948: $lh=$li;
1.25 www 949: }
1.31 www 950:
1.35 www 951: &addlog("Boundaries: x=".&actualval($li,$xmin,$xmax)." (".$Apache::functionplotresponse::actualxval[$li]."; index $li)) to x=".
952: &actualval($lh,$xmin,$xmax)." (".$Apache::functionplotresponse::actualxval[$lh]."; index $lh))");
953: if ($findupper) {
954: &addlog("Looking for label $xfinallabel");
955: }
1.33 www 956: my $tol=$percent*($ymax-$ymin)/100;
957: if ($xmax>$xmin) {
958: if ($derivative==2) {
959: $tol=4.*$tol/($xmax-$xmin);
960: } elsif ($derivative==1) {
961: $tol=2.*$tol/($xmax-$xmin);
962: }
1.27 www 963: }
964: for (my $i=$li; $i<=$lh; $i++) {
1.25 www 965: my $val;
966: if ($derivative==2) {
1.27 www 967: $val=$Apache::functionplotresponse::d2funcdx2[$i];
1.25 www 968: } elsif ($derivative==1) {
1.27 www 969: $val=$Apache::functionplotresponse::dfuncdx[$i];
1.25 www 970: } else {
1.27 www 971: $val=$Apache::functionplotresponse::func[$i];
1.25 www 972: }
1.31 www 973: unless (&compare_rel($relationship,$value,$val,$tol)) {
1.37 www 974: &addlog("Actual value ".(defined($val)?$val:'undef').", expected $value, tolerance $tol");
1.35 www 975: &addlog("Condition not fulfilled at x=".&actualval($i,$xmin,$xmax)." (".$Apache::functionplotresponse::actualxval[$i]."; index $i)");
1.31 www 976: if (($findupper) && ($i>$li)) {
1.35 www 977: # check for minimum and maximum lengths
978: my $length=&actualval($i,$xmin,$xmax)-&actualval($li,$xmin,$xmax);
979: if ($minimumlength) {
980: if ($length<$minimumlength) {
981: &addlog("Rule $label failed, actual length $length, minimum length $minimumlength");
982: return 0;
983: }
984: }
985: if ($maximumlength) {
986: if ($length>$maximumlength) {
987: &addlog("Rule $label failed, actual length $length, maximum length $maximumlength");
988: return 0;
989: }
990: }
1.31 www 991: $Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}=$i;
1.35 www 992: &addlog("Rule $label passed, setting label $xfinallabel");
1.31 www 993: return 1;
994: } else {
1.35 www 995: &addlog("Rule $label failed.");
1.37 www 996: my $hintlabel=$label;
997: $hintlabel=~s/^R//;
998: push(@Apache::functionplotresponse::failedrules,$hintlabel);
999: &addlog("Set hint condition $hintlabel");
1.31 www 1000: return 0;
1001: }
1002: }
1.25 www 1003: }
1.35 www 1004: &addlog("Rule $label passed.");
1.27 www 1005: return 1;
1.24 www 1006: }
1007:
1.37 www 1008: sub start_functionplotruleset {
1009: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1010: if ($target eq 'edit') {
1011: return &Apache::edit::start_table($token).
1012: '<tr><td><span class="LC_nobreak">'.&mt('Function Plot Rule Set').'</span></td>'
1013: .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
1014: .&Apache::edit::deletelist($target,$token).' '.
1015: &Apache::edit::insertlist($target,$token)
1016: .'</span></td>'
1017: ."<td> "
1018: .&Apache::edit::end_row()
1019: .&Apache::edit::start_spanning_row()
1020: ."\n";
1021: }
1022: }
1.3 www 1023:
1.37 www 1024: sub end_functionplotruleset {
1025: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1026: my $id=$Apache::inputtags::response[-1];
1027: my $partid=$Apache::inputtags::part;
1028: my $internalid = $partid.'_'.$id;
1029:
1030: if ($target eq 'edit' ) {
1031: return &Apache::edit::end_table();
1032: } elsif ($target eq 'grade'
1.10 www 1033: && &Apache::response::submitted()
1034: && $Apache::lonhomework::type ne 'exam') {
1.12 www 1035: #
1036: # Actually grade
1037: #
1.37 www 1038: my $xmin=&Apache::lonxml::get_param('xmin',$parstack,$safeeval,-2);
1.18 www 1039: $xmin=(defined($xmin)?$xmin:-10);
1.37 www 1040: my $xmax=&Apache::lonxml::get_param('xmax',$parstack,$safeeval,-2);
1.18 www 1041: $xmax=(defined($xmax)?$xmax:10);
1.37 www 1042: my $ymin=&Apache::lonxml::get_param('ymin',$parstack,$safeeval,-2);
1.25 www 1043: $ymin=(defined($ymin)?$ymin:-10);
1.37 www 1044: my $ymax=&Apache::lonxml::get_param('ymax',$parstack,$safeeval,-2);
1.25 www 1045: $ymax=(defined($ymax)?$ymax:10);
1.27 www 1046:
1.24 www 1047: my $ad='';
1.30 www 1048: undef %Apache::functionplotresponse::functionplotrulelabels;
1.35 www 1049: $Apache::functionplotresponse::ruleslog='';
1.30 www 1050: $Apache::functionplotresponse::functionplotrulelabels{'start'}=400;
1051: $Apache::functionplotresponse::functionplotrulelabels{'end'}=0;
1.18 www 1052: if (&populate_arrays($internalid,$xmin,$xmax) eq 'no_func') {
1.21 www 1053: $ad='NOT_FUNCTION';
1.18 www 1054: } else {
1.35 www 1055: &addlog("Start of function ".&actualval($Apache::functionplotresponse::functionplotrulelabels{'start'},$xmin,$xmax)." (index ".
1056: $Apache::functionplotresponse::functionplotrulelabels{'start'}.")");
1057: &addlog("End of function ".&actualval($Apache::functionplotresponse::functionplotrulelabels{'end'},$xmin,$xmax)." (index ".
1058: $Apache::functionplotresponse::functionplotrulelabels{'end'}.")");
1059:
1.24 www 1060: # We have a function that we can actually grade, go through the spline rules.
1.25 www 1061: foreach my $rule (@Apache::functionplotresponse::functionplotrules) {
1.33 www 1062: unless (&functionplotrulecheck($rule,$xmin,$xmax,$ymin,$ymax)) {
1.24 www 1063: $ad='INCORRECT';
1064: last;
1065: }
1066: }
1067: # If it's not wrong, it's correct
1068: unless ($ad) { $ad='EXACT_ANS' };
1.18 www 1069: }
1.37 www 1070: &addlog("Set hint conditions: ".join(",",@Apache::functionplotresponse::failedrules));
1071: &addlog("Assigned award detail: $ad");
1072: # Store for later to be assigned at end_functionplotresponse
1073: $Apache::functionplotresponse::awarddetail=$ad;
1074: }
1075: }
1076:
1077:
1078: sub end_functionplotresponse {
1079: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1080: &Apache::response::end_response;
1081:
1082: my $result;
1083: my $id=$Apache::inputtags::response[-1];
1084: my $partid=$Apache::inputtags::part;
1085: my $internalid = $partid.'_'.$id;
1.20 www 1086:
1.37 www 1087: if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
1088: if ($target eq 'grade'
1089: && &Apache::response::submitted()
1090: && $Apache::lonhomework::type eq 'exam') {
1091:
1092: &Apache::response::scored_response($partid,$id);
1093:
1094: } elsif ($target eq 'grade'
1095: && &Apache::response::submitted()
1096: && $Apache::lonhomework::type ne 'exam') {
1097: my ($response,%coords)=&get_answer_from_form_fields($internalid);
1098: $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
1099: my %previous=&Apache::response::check_for_previous($response,$partid,$id);
1100: #
1101: # Assign grade
1102: #
1103: my $ad=$Apache::functionplotresponse::awarddetail;
1.12 www 1104: #
1105: # Store grading info
1106: #
1107: $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
1108: &Apache::response::handle_previous(\%previous,$ad);
1.10 www 1109: } elsif ($target eq 'web') {
1.37 www 1110: undef @Apache::functionplotresponse::failedrules;
1111: }
1112: return $result;
1113: }
1114:
1115: sub end_functionplotelements {
1116: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
1117: my $result='';
1118: my $id=$Apache::inputtags::response[-1];
1119: my $partid=$Apache::inputtags::part;
1120: my $internalid = $partid.'_'.$id;
1121: if ($target eq 'edit' ) {
1122: $result=&Apache::edit::end_table();
1123: } elsif ($target eq 'web') {
1.6 www 1124: # Now is the time to render all of the stored splines
1.40 ! www 1125: my $xmin=&Apache::lonxml::get_param('xmin',$parstack,$safeeval,-2);
! 1126: $xmin=(defined($xmin)?$xmin:-10);
! 1127: my $xmax=&Apache::lonxml::get_param('xmax',$parstack,$safeeval,-2);
! 1128: $xmax=(defined($xmax)?$xmax:10);
! 1129: my $ymin=&Apache::lonxml::get_param('ymin',$parstack,$safeeval,-2);
! 1130: $ymin=(defined($ymin)?$ymin:-10);
! 1131: my $ymax=&Apache::lonxml::get_param('ymax',$parstack,$safeeval,-2);
! 1132: $ymax=(defined($ymax)?$ymax:10);
! 1133: if ($xmax<=$xmin) {
! 1134: $xmax=$xmin+20;
! 1135: }
! 1136: if ($ymax<=$ymin) {
! 1137: $ymax=$ymin+20;
! 1138: }
1.6 www 1139: foreach my $label (keys(%Apache::functionplotresponse::splineorder)) {
1.40 ! www 1140: $result.=&generate_spline($internalid,$label,$xmin,$xmax,$ymin,$ymax);
1.6 www 1141: }
1.5 www 1142: # close the init script
1.3 www 1143: $result.=&end_init_script();
1.17 www 1144: # register all splines in this response
1145: $result.='<input type="hidden" name="HWVAL_AllSplines_'.$internalid.'" value="'.
1146: join(',',keys(%Apache::functionplotresponse::splineorder)).'" />'."\n";
1147: foreach my $label (keys(%Apache::functionplotresponse::splineorder)) {
1148: $result.='<input type="hidden" name="HWVAL_SplineOrder_'.$internalid.'_'.$label.'" value="'.
1149: $Apache::functionplotresponse::splineorder{$label}.'" />'."\n";
1150: }
1.9 www 1151: # generate the input fields
1152: $result.=$Apache::functionplotresponse::inputfields;
1.5 www 1153: # actually start the <applet>-tag
1.3 www 1154: $result.=&geogebra_startcode($internalid);
1.5 www 1155: # load the spline bytecode
1.3 www 1156: $result.=&geogebra_spline_program();
1.5 www 1157: # set default parameters
1.3 www 1158: $result.=&geogebra_default_parameters($internalid);
1.5 www 1159: # close the <applet>-tag
1.1 www 1160: $result.=&geogebra_endcode();
1161: }
1162: return $result;
1163: }
1164:
1.37 www 1165: sub start_functionplotelements {
1166: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1167: my $result='';
1168: my $id=$Apache::inputtags::response[-1];
1169: my $partid=$Apache::inputtags::part;
1170: my $internalid = $partid.'_'.$id;
1171:
1172: if ($target eq 'edit') {
1173: return &Apache::edit::start_table($token).
1174: '<tr><td><span class="LC_nobreak">'.&mt('Function Plot Elements').'</span></td>'
1175: .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
1176: .&Apache::edit::deletelist($target,$token).' '.
1177: &Apache::edit::insertlist($target,$token)
1178: .'</span></td>'
1179: ."<td> "
1180: .&Apache::edit::end_row()
1181: .&Apache::edit::start_spanning_row()
1182: ."\n";
1183: } elsif ($target eq 'web') {
1184: my $xmin=&Apache::lonxml::get_param('xmin',$parstack,$safeeval,-2);
1185: $xmin=(defined($xmin)?$xmin:-10);
1186: my $xmax=&Apache::lonxml::get_param('xmax',$parstack,$safeeval,-2);
1187: $xmax=(defined($xmax)?$xmax:10);
1188: my $ymin=&Apache::lonxml::get_param('ymin',$parstack,$safeeval,-2);
1189: $ymin=(defined($ymin)?$ymin:-10);
1190: my $ymax=&Apache::lonxml::get_param('ymax',$parstack,$safeeval,-2);
1191: $ymax=(defined($ymax)?$ymax:10);
1192: if ($xmax<=$xmin) {
1193: $xmax=$xmin+20;
1194: }
1195: if ($ymax<=$ymin) {
1196: $ymax=$ymin+20;
1197: }
1198: my $xaxisvisible=(&Apache::lonxml::get_param('xaxisvisible',$parstack,$safeeval,-2)=~/on|true|yes|1/i?'true':'false');
1199: my $yaxisvisible=(&Apache::lonxml::get_param('yaxisvisible',$parstack,$safeeval,-2)=~/on|true|yes|1/i?'true':'false');
1200: my $gridvisible=(&Apache::lonxml::get_param('gridvisible',$parstack,$safeeval,-2)=~/on|true|yes|1/i?'true':'false');
1201: my $xlabel=&Apache::lonxml::get_param('xlabel',$parstack,$safeeval,-2);
1202: my $ylabel=&Apache::lonxml::get_param('ylabel',$parstack,$safeeval,-2);
1203:
1204:
1205: # paste in the update routine to receive stuff back from the applet
1206: $result.=&update_script($internalid);
1207: # start the initscript for this applet
1208: $result.=&start_init_script($internalid);
1209: # put the axis commands inside
1210: $result.=&axes_script($internalid,$xmin,$xmax,$ymin,$ymax,$xaxisvisible,$yaxisvisible,$gridvisible);
1211: $result.=&axes_label($internalid,$xlabel,$ylabel);
1212: # init script is left open
1213: }
1214: return $result;
1215: }
1216:
1.1 www 1217: 1;
1218:
1219: __END__
1220:
1221: =head1 NAME
1222:
1223: Apache::functionplotresponse.pm;
1224:
1225: =head1 SYNOPSIS
1226:
1227: Handles tags associated with accepting function plots.
1228:
1229: This is part of the LearningOnline Network with CAPA project
1230: described at http://www.lon-capa.org.
1231:
1232: =head1 HANDLER SUBROUTINE
1233:
1234: start_functionplotresponse()
1235:
1236: =head1 OTHER SUBROUTINES
1237:
1238: =over
1239:
1240: =item end_functionplotresponse()
1241:
1242: =back
1243:
1244: =cut
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to functionplotresponse.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom / homework