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    1: # LearningOnline Network with CAPA
    2: # option list style responses
    3: #
    4: # $Id: functionplotresponse.pm,v 1.14 2010/10/17 22:32:19 www Exp $
    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;
   34: 
   35: BEGIN {
   36:   &Apache::lonxml::register('Apache::functionplotresponse',('functionplotresponse','backgroundplot','spline','splinerule'));
   37: }
   38: 
   39: #
   40: # There can be a number of applets on a page, each called ggbApplet_$id, 
   41: # where $id is the "_"-concatenated part and responseid
   42: #
   43: 
   44: sub geogebra_startcode {
   45:     my ($id)=@_;
   46:     return (<<ENDSTARTCODE);
   47: <applet name="ggbApplet_$id" code="geogebra.GeoGebraApplet" archive="geogebra.jar"
   48:          codebase="/adm/geogebra/"  width="714" height="447" MAYSCRIPT>
   49:        <param name="java_arguments" value="-Xmx512m -Djnlp.packEnabled=true"/>
   50: ENDSTARTCODE
   51: }
   52: 
   53: sub geogebra_endcode {
   54:     return &Apache::lonhtmlcommon::java_not_enabled()."</applet>\n";
   55: }
   56: 
   57: #
   58: # This is the internal GeoGebra bytecode which defines the spline functions
   59: #
   60: sub geogebra_spline_program {
   61:     return (<<ENDSPLINEPROGRAM);
   62: <param name="ggbBase64" value="UEsDBBQACAAIADhQET0AAAAAAAAAAAAAAAASAAAAZ2VvZ2VicmFfbWFjcm8ueG1s7Z1bb+PGGYavk19BMDfexkvP+QCsEqzOuWi7gIveBG1By7RXrSwJsqyY+fWdGZLS2pQtzdqWSPoDApOSqCH5vSTnmdH7bj79en8zCVbJ4nY8m7ZCHKEwSKaj2eV4et0K75ZXH1X46y8/frpOZtfJxSIOrmaLm3jZCmlEQvP+TTxazILRzeXf4pukFZ7PJ+NpQsJgOZtNtrw1TCbz9Vu/f8Gn5/j0Czk9J/8Kg/FoNu2PJ+YrYXD7dfbHb9N/mG+040UrXC7ukvXefpvO75ZBjFrh5zCIsVnEZklaYdssqFnE4Vmx7d/vluuNV9nW7VW29ee228zs9NY0P1qa8w+W42W2//hu+XW2sGuX8dK+Y7ZMJslNMl0Gy3Ru3pnPxtNlGEzii2Rij+SXH3/4ZI86mF38Nxkt82MuPr+KJ7eJ3d8Pn8znndlktghM86bY1+7vhfsbT+ZfY7NmRHCbTuI0WQSreGI/zd8xzf11dpk8eDeejo0m9gRul8ncNoBNCedJcpkrmh2yWZmbJp2y3xzQaDZbXN4G962QRBwhKpEginGFJA2DtBWyiDPNJOVYEiwFEmHwZ9au+7orxPn4z/yQqKvqWV6sHWVrN6JsLMIIESqJ4EIiJiXP6yYoUoQIoYggFPHXq5u54l9cOML58UtHIkW4FJJQIqhQQrrK8UhizqRCmHPCNCeveMU1pXIsYlIrIYS57jBhiOWV4+ZdLZCWGEtMsGfl7ueL5NZ2BUU54ov/3Jse4X6erZ7cfwhawQmJUPCX4P7fJzRCH4KPAS1eE/v65wDbhXnj5LN9xd2nJ5vNyaPN7/ONY/OZ+8bJx4d7+PnhHrLN21vbfriJbbH9IQzOSpfF1d3UPfPDB2fqdDN90/kynSTB8ut49L+pKYjRfCPMWekCygQqGnKX01s9s/Y4uJ2CphtBUz9BUx9BUz9B092Cpr6Cpo0TdDS7uYmnl8HUsVXnbrFKOvFimdyO46k72fGajtz9uvyQUY/T2r0w6LPMQMkeaxCzb54Ps29wKcOjs3yHpXKP7K5H612ve6b20yUXz5V8n4ewe/C+WdHFnkX/pzne2eJRsTcoWirk6vlCrrLm1gVcfec1e9BebNMPoYgSTrUQiGGppGbYdUQ4wuYtxJhW1IAk4xk1bna0z/m5vWRb3dq/5qpbX3BZAZbm9RfbqWVPtM/foVw7HxaUlWv7Kdeun3JSC6KphS2sDb1m3IoizbTVjCjFmcJcH0K69mPpzr4dmdnXbkD31JCTloectDzkpN8OOU+/0NNz+roDT/c47ZgFN4v9xqGdVfbtz+3s2+0OjEvL41IimZLIAK151FAN41IYl771uJSbxx8VWFCsGKUwLoVxKYxLYVwK41IYl8K4tB6jGxiXwrj09celz1FcpxHjBoO53CCvMIMGwoSF3WLcYCCOasSxZlRJX4Z7rm5NoV8REcwpNhUiihJRwK+gDJurVjCmEOHspfB7MVrDr131hd/tPPME/OZksy/8dnbDb8e22NmPldyZNo2VtgqabgT1hl8PQVM/QdPdgqa+gr5r+HX3awG/Tmsf+M3nBn3ht915n/DbycrcKSNUxw+hOrVDKGanWhQnhCshCOO0QCgpsNIKGzYWVBF1CITqvGxqn5Wn9ll5ap/9/uWn0/OfTqMoetMp/SAWrbBrFtIs/Gb4u6usMTfTz91t6VrrdGHGH2b8YcYfZvxrWTmY8YcZf5jxhxl/mPGvxKAHZvxhxr9+ysGM/5Fn/IkkBBFlBg7M3CpvPWxo0IQ/VgprpZDGHBeRKR4JZMeuTCGLxkrBjD/M+MOMf3MEhRn/asIvzPhXc8b/ORboNgKhpBHAkpJiBCsm1JvPvHabglAykgafBGdMmCuUSV3MH3IipZaYMso5961cqccdXa4Ryq76ItT2XvEJhMr7x30Rqrsbobq2xe5+Pa4706b1uFsFTTeCeiOUh6Cpn6DpbkFTX0HfNUK5+7VAKKe1D0LlP6/6IlSn+z4RqpuVuVtGqK4fQnVrh1AP5w+pLAiKYM0lYhxLs8Uh+Kn7WDc/xwQvOyZ42THBj+OYCGLVCntmoc3i+wwUvVXWuDNSiNxIId0t61rv9lyzYKgAQwUYKsBQUbfKgaECDBVgqABDBRgqKjEgAkMFGCrqpxwYKsBQUUf4BUMFGCrAUAGGCjBUVAJ+wVABhorjgAAYKsBQAYaKQyIUGCpqLSgYKqqJUGCoqKCh4jkQ6DWCn3SEsZAGk5j5iwghxS/+UnClNULmD5av+Ptrryn8pCNmmFMwxZH9585w8T+lYYxR7C5lpIl+KT5dJmt8squ++LS9R3wCn/K+cV986u3Gp55tsbdfb+vOtGm97VZB042g3vjkIWjqJ2i6W9DUV9B3jU/ufi3wyWntg0+5O80Xn7q994lPvazMvTI+9fzwqVdzfOJM5PykhJSEmcG8wgjjg0xA9R4r5+dIFWVHqig7UkUlHKmmDdNW3y5NY/2XWVT7q2xvzqoqc6uqyq2q2t3V2f56fbcf8KyCZxU8q+BZrVvlwLMKnlXwrIJnFTyrlRg0gWcVPKv1Uw48q+BZrSP8gmcVPKvgWQXPKnhWKwG/4FkFz+pxQAA8q+BZBc/qIREKPKu1FhQ8q9VEKPCsgmf1CBQAnlXwrIJnFTyr4FkFz2qd8Qk8q5X0rD5HAv1GABRGkZTI1FpwTKnBpmICClGJBFGMKySp7y9Rz5WtKQCFcYSlFJgyJDjXhNM3Iajkak1QdtWXoLZ3ik8QVN497ktQ/d0E1bct9vfrcN2ZNq3D3SpouhHUm6A8BE39BE13C5r6CvquCcrdrwVBOa19CCr39/sSVK//Pgmqn5W5Xyaovh9B9WtHUKYDkoxLzgmhTFNW/IanzAdIKs0wUTw3ob8xQfUfK+eX+pHl1I8sp35kNVM/ZsW0NrBL09zgdWJAg1W2fxcHUnkcSOdxIIyKPBB2N352BP2B2zMEgyAYBMEgCAbVrXIQDIJgEASDIBgEwaBKjKsgGATBoPopB8EgCAbVEX4hGATBIAgGQTAIgkGVgF8IBkEw6DggAMEgCAZBMOiQCAXBoFoLCsGgaiIUBIMgGHQECoBgEASDIBgEwSAIBkEwqM74BMEgCAYdBQMgGATBIAgGHZKgIBhUa0EhGFRNgoJgUCWDQc+hwKAZBEUiojRVhp8kR5SJN0eoQWMQikS2ZIJaq6U2/+ECobDEWprRACJ2EPBShrq6XjOUXfVlqO3d4hMMlXeQ+zLUYDdDDWyLg/26XHemTetytwqabgT1ZigPQVM/QdPdgqa+gr5rhnL3a8FQTmsfhsozkr4M1R+8T4YaZGUelBlq4MdQg/ox1AMfFGcFQpnhvbPoMia0OkgGYPBYOL9stSpnq1U5W61qkq02K6a9oV2aBoevG7YerrIDcqFrnYeuMSpS17hIXZMidU3doyE7psHQHQvEryF+DfFriF/XrXIQv4b4NcSvIX4N8etKjLwgfg3x6/opB/FriF/XEX4hfg3xa4hfQ/wa4teVgF+IX0P8+jggAPFriF9D/PqQCAXx61oLCvHraiIUxK8hfn0ECoD4NcSvIX4N8WuIX0P8us74BPFriF8fBQMgfg3xa4hfH5KgIH5da0Ehfl1NgoL4NcSvj8MBEL+G+DXErw/KUBC/rrWgEL+uJkNB/LqK8evnUGDYDISikdCaGVxShlaZRipHKJudZEgyrTizCd7XY6hhYxiKRXg98+T7Q2epY73+uiYlu+pLSts7vydIKe8G9yWl4W5SGtoWh/t1rO5Mm9axbhU03QjqTUoegqZ+gqa7BU19BW06KW3ttIdZpz0sd9pDv057WL9OmyIuiMYYcY40UWvnDZN2Qh5hxjkR7BC99vAFjOuetAXjurvUh3HzfwfEl3EHwwYy7pP/Us3ZdTK7Ti4W8S//B1BLBwhgj4YNdwsAAFgqAQBQSwMEFAAIAAgAOFARPQAAAAAAAAAAAAAAAAwAAABnZW9nZWJyYS54bWytVE2P2jAQPXd/heV7gTgEgpSwareXrVB7YLuH3pxkCC5OHNkOH/vrO7YT2EXqrQdw/Gb8/ObL2eO5keQI2gjV5jSazCiBtlSVaOuc9nb3OaWP64esBlVDoTnZKd1wm9N4wqjDe7F++JSZvToRLr3Lq4BTTndcGqDEdBp4ZfYA9gPO+7OQguvLz+IPlNbcDIHkue16vMXqHrGyqTbCjNupv7CTwn4TR1GBJlKVOV0kKB2/XkFbUXKZ0/ksICyn7M6IUOyse6XFm2qtc7+R7xAhxIg3wIwwh2VTH2gGfSlFJXjrgvE60ImQk6jsPqfLhCEliHqPWpNoFthKpXS1vRgLDTn/Bq3w7iWbLJaLmMX4wz88dgkWlqSTZJGweTRny9UqWWIKUS8KYYtJzFJkZctZki5SluChf9v81XDcgrVYSkP4GcyYz1qL6ppwt3k2X5W8QZ0SrX3ine21b4N4gLb24m7DvGkX45e2ljBgEVZpD+WhUOdtyFscqF8unT/i9RT1k5JKE+0CRf31sBZh9T5O6NVr5n1m3mPgcKRXe7Ri3sOvRVi9lxRtkDYEHo1Rj1XhZ2GIA5Dcde+YG8kLwGagpG+F3YwbbJrDLVLn/6NvCpya921zpYz+E2U2veu37AC6BRm6qsXC9qo35Oi6N5TO66igFA1ug2FICHfF+oUCAlpBrWHUHUYupMtbP3TuHZxNRxFOg0GtpcW3A+OxLpZt51Kfugm3OF05/c4bMGTD8Y2xF0oqbtHLPR3T98f9iA1vzPovUEsHCEyILqxEAgAAlQQAAFBLAQIUABQACAAIADhQET1gj4YNdwsAAFgqAQASAAAAAAAAAAAAAAAAAAAAAABnZW9nZWJyYV9tYWNyby54bWxQSwECFAAUAAgACAA4UBE9TIgurEQCAACVBAAADAAAAAAAAAAAAAAAAAC3CwAAZ2VvZ2VicmEueG1sUEsFBgAAAAACAAIAegAAADUOAAAAAA=="/>
   63: ENDSPLINEPROGRAM
   64: }
   65: 
   66: #
   67: # The standard set of parameters inside <applet>
   68: #
   69: sub geogebra_default_parameters {
   70:    my ($id)=@_;
   71:    return(<<ENDDEFAULTPARAMETERS);
   72:         <param name="image" value="/adm/lonIcons/lonanim.gif"  />
   73:         <param name="boxborder" value="false"  />
   74:         <param name="centerimage" value="true"  />
   75:         <param name="java_arguments" value="-Xmx512m" />
   76:         <param name="cache_archive" value="geogebra.jar, geogebra_main.jar, geogebra_gui.jar, geogebra_cas.jar, geogebra_export.jar, geogebra_properties.jar" />
   77:         <param name="cache_version" value="3.2.44.0, 3.2.44.0, 3.2.44.0, 3.2.44.0, 3.2.44.0, 3.2.44.0" />
   78:         <param name="framePossible" value="false" />
   79: 
   80:         <param name="showResetIcon" value="false" />
   81:         <param name="showAnimationButton" value="false" />
   82:         <param name="enableRightClick" value="false" />
   83:         <param name="errorDialogsActive" value="true" />
   84:         <param name="enableLabelDrags" value="false" />
   85:         <param name="showMenuBar" value="false" />
   86:         <param name="showToolBar" value="false" />
   87:         <param name="showToolBarHelp" value="false" />
   88:         <param name="showAlgebraInput" value="false" />
   89:         <param name="enableShiftDragZoom" value="false" />
   90:         <param name="allowRescaling" value="false" />
   91:         <param name="enableLabelDrags" value="false" />
   92:         <param name="ggbOnInitParam" value="applet_$id" />
   93: ENDDEFAULTPARAMETERS
   94: }
   95: 
   96: #
   97: # This subroutine is called by LON-CAPA at </problem>
   98: # Each applet on the page will call function ggbOnInit when it is done loading
   99: # This function in turn will call the respective function registered by start_init_script
  100: # Which one of the registered functions is called is determined by ggbOnInitParam, which GeoGebra passes to ggbOnInit
  101: #
  102: 
  103: sub init_script {
  104:    if ($Apache::functionplotresponse::callscripts) {
  105:       return (<<ENDGGBINIT);
  106: <script type="text/javascript">
  107: // <![CDATA[
  108: function ggbOnInit(param) {
  109: $Apache::functionplotresponse::callscripts
  110: }
  111: // ]]>
  112: </script>
  113: ENDGGBINIT
  114:    }
  115: }
  116: 
  117: #
  118: # Each Geogebra applet is supposed to call this when parameters change
  119: # Changes the hidden fields on the web page
  120: #
  121: sub update_script {
  122:     my ($id)=@_;
  123:     return (<<ENDUPDATESCRIPT);
  124: <script type="text/javascript">
  125: // <![CDATA[
  126: function updatePointCoordinates_$id(coordinateName) {
  127:             var x = document.ggbApplet_$id.getXcoord(coordinateName);
  128:             var y = document.ggbApplet_$id.getYcoord(coordinateName);
  129:             document.lonhomework.elements["HWVAL_$id\_" + coordinateName + "_x"].value = x;
  130:             document.lonhomework.elements["HWVAL_$id\_" + coordinateName + "_y"].value = y;
  131:         }
  132: // ]]>
  133: </script>
  134: ENDUPDATESCRIPT
  135: }
  136: 
  137: #
  138: # Register the above update-handler for a variable
  139: #
  140: 
  141: sub update_register {
  142:    my ($id,$variable)=@_;
  143:    return "document.ggbApplet_$id.registerObjectUpdateListener('$variable','updatePointCoordinates_$id');\n";
  144: }
  145: 
  146: #
  147: # Set a coordinate variable
  148: #
  149: sub set_coordinate {
  150:    my ($id,$variable,$x,$y)=@_;
  151:    return (<<ENDSETVARIABLE);
  152: document.ggbApplet_$id.evalCommand("$variable=($x,$y)");
  153: ENDSETVARIABLE
  154: }
  155: 
  156: #
  157: # Input field name for a coordinate variable
  158: #
  159: 
  160: sub field_name {
  161:     my ($id,$variable,$name)=@_;
  162:     return "HWVAL_$id\_$variable\_$name";
  163: }
  164: 
  165: #
  166: # Generate an input field for a coordinate variable
  167: #
  168: 
  169: sub generate_input_field {
  170:     my ($id,$variable,$x,$y)=@_;
  171:     $Apache::functionplotresponse::inputfields.=
  172:        "<input type='hidden' name='".&field_name($id,$variable,'x')."' value='$x' />\n".
  173:        "<input type='hidden' name='".&field_name($id,$variable,'y')."' value='$y' />\n";
  174: }
  175: 
  176: #
  177: # Initialize a new coordinate variable at set a listener on it
  178: #
  179: sub new_coordinate {
  180:     my ($id,$variable,$x,$y)=@_;
  181:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'x')})) {
  182:        $x=$Apache::functionplotresponse::previous{&field_name($id,$variable,'x')};
  183:     }
  184:     if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'y')})) {
  185:        $y=$Apache::functionplotresponse::previous{&field_name($id,$variable,'y')};
  186:     }
  187:     &generate_input_field($id,$variable,$x,$y);
  188:     return &set_coordinate($id,$variable,$x,$y).&update_register($id,$variable);
  189: }
  190: 
  191: #
  192: # This registers the init-function call for ggbOnInit, which LON-CAPA will place at </problem>
  193: # It then starts the right headers
  194: #
  195: sub start_init_script {
  196:     my ($id)=@_;
  197: # Add a line to ggbOnInit-function which calls the right function based on parameter passed from GeoGebra
  198:     $Apache::functionplotresponse::callscripts.="if (param=='applet_$id') { ggbInit_$id(); }\n";
  199: # ... and open this function
  200:     return (<<ENDSTARTINIT);
  201: <script type="text/javascript">
  202: // <![CDATA[
  203: // variable that will eventually be passed back to the server
  204: var coordinateMap_$id = [];
  205: // Init-function for applet
  206: function ggbInit_$id() {
  207: ENDSTARTINIT
  208: }
  209: 
  210: #
  211: # This sets the axes inside ggbInit_$id
  212: #
  213: 
  214: sub axes_script {
  215:     my ($id,$xmin,$xmax,$ymin,$ymax,$xvisible,$yvisible,$gvisible)=@_;
  216:     return (<<ENDAXESSCRIPT);
  217:             // changes (xmin, xmax, ymin, ymax)
  218:             document.ggbApplet_$id.setCoordSystem($xmin,$xmax,$ymin,$ymax);
  219: 
  220:             // makes the (x,y) axis (in)visible
  221:             document.ggbApplet_$id.setAxesVisible($xvisible,$yvisible);
  222:             // makes the grid (in)visible
  223:             document.ggbApplet_$id.setGridVisible($gvisible);
  224: ENDAXESSCRIPT
  225: }
  226: 
  227: sub axes_label {
  228:     my ($id,$xlabel,$ylabel)=@_;
  229:     unless ($xlabel || $ylabel) { return ''; }
  230:     my $return='document.ggbApplet_'.$id.'.evalCommand("topRight=Corner[3]");';
  231:     if ($xlabel) {
  232:        $return.=(<<ENDXAXISLABELSCRIPT);
  233: document.ggbApplet_$id.evalCommand("Xlabel=(x(topRight)-AxisStepX[],AxisStepY[]/6)");
  234: document.ggbApplet_$id.setVisible("Xlabel",false);
  235: document.ggbApplet_$id.evalCommand("Text[\\"$xlabel\\", Xlabel]");
  236: ENDXAXISLABELSCRIPT
  237:     }
  238:     if ($ylabel) {
  239:        $return.=(<<ENDYAXISLABELSCRIPT);
  240: document.ggbApplet_$id.evalCommand("Ylabel=(AxisStepX[]/6,y(topRight)-AxisStepY[]/3)");
  241: document.ggbApplet_$id.setVisible("Ylabel",false);
  242: document.ggbApplet_$id.evalCommand("Text[\\"$ylabel\\", Ylabel]");
  243: ENDYAXISLABELSCRIPT
  244:     }
  245:     return $return;
  246: }
  247: 
  248: sub plot_script {
  249:    my ($id,$function,$fixed)=@_;
  250:    if ($fixed) {
  251: # Use stupid trick to nail this to a location
  252: # Oddly, it seems like only one plot cannot be nailed to a location
  253: # Non-nailed-down plots apparently get overwritten
  254:       return (<<ENDPLOTSCRIPT);
  255:             document.ggbApplet_$id.evalCommand("a=1");
  256:             document.ggbApplet_$id.setVisible("a",false);
  257:             // This MUST be a DEPENDENT OBJECT in order to be locked down:
  258:             document.ggbApplet_$id.evalCommand("y=a*($function)");
  259: ENDPLOTSCRIPT
  260:    } else {
  261:        return "document.ggbApplet_$id.evalCommand('y=$function')";
  262:    }
  263: }
  264: 
  265: #
  266: # Subroutine that generates code for spline $label based on stored information
  267: #
  268: 
  269: sub generate_spline {
  270:    my ($id,$label)=@_;
  271:    my $result='';
  272:    my $order=$Apache::functionplotresponse::splineorder{$label};
  273:    my $x=$Apache::functionplotresponse::splineinitx{$label};
  274:    my $y=$Apache::functionplotresponse::splineinity{$label};
  275:    my $sx=$Apache::functionplotresponse::splinescalex{$label};
  276:    my $sy=$Apache::functionplotresponse::splinescaley{$label};
  277:    my @coords=();
  278:    foreach my $i (1..$order) {
  279:        $result.=&new_coordinate($id,$label.'P'.$i,$x,$y);
  280:        $x+=$sx/(2.*($order-1));
  281:        push(@coords,$label.'P'.$i);
  282:        $result.=&new_coordinate($id,$label.'S'.$i,$x,$y+$sy);
  283:        $x+=$sx/(2.*($order-1));
  284:        push(@coords,$label.'S'.$i);
  285:    }
  286:    $result.='document.ggbApplet_'.$id.'.evalCommand("Spline'.$order.'['.join(',',@coords).']");'."\n";
  287:    return $result;
  288: }
  289: #
  290: # <backgroundplot function="..." fixed="yes/no" />
  291: #
  292: sub start_backgroundplot {
  293:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  294:    my $result='';
  295:    my $internalid = $Apache::inputtags::part.'_'.$Apache::inputtags::response[-1];
  296:    my $function=&Apache::lonxml::get_param('function',$parstack,$safeeval);
  297:    my $fixed=(&Apache::lonxml::get_param('fixed',$parstack,$safeeval)=~/on|true|yes|1/i?1:0);
  298:  
  299:    unless ($function) { $function="0"; }
  300:    if ($target eq 'web') {
  301:       $result.=&plot_script($internalid,$function,$fixed);
  302:    } elsif ($target eq 'edit') {
  303:         $result=&Apache::edit::tag_start($target,$token,'Background Function Plot').
  304:              &Apache::edit::text_arg('Function:','function',
  305:                                      $token,'16').
  306:              &Apache::edit::select_arg('Fixed location:','fixed',
  307:                                   ['yes','no'],$token).
  308:              &Apache::edit::end_row();
  309:   } elsif ($target eq 'modified') {
  310:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
  311:                                                  $safeeval,'function','fixed');
  312:     if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
  313:   }
  314:   return $result;
  315: }
  316: 
  317: sub end_backgroundplot {
  318:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  319:    my $result='';
  320:    if ($target eq 'edit') {
  321:        $result=&Apache::edit::end_table();
  322:    }
  323:    return $result;
  324: }
  325: 
  326: #
  327: # <splinerule ... />
  328: #
  329: sub start_splinerule {
  330:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  331:    my $result='';
  332:    my $internalid = $Apache::inputtags::part.'_'.$Apache::inputtags::response[-1];
  333:    if ($target eq 'edit') {
  334:         $result=&Apache::edit::tag_start($target,$token,'Spline Evaluation Rule').
  335:                 &Apache::edit::end_row();
  336:    }
  337:    return $result;
  338: }
  339: 
  340: sub end_splinerule {
  341:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  342:    my $result='';
  343:    if ($target eq 'edit') {
  344:        $result=&Apache::edit::end_table();
  345:    }
  346:    return $result;
  347: }
  348: 
  349: 
  350: #
  351: # <spline label="..." order="1,2,3,4" initx="..." inity="..." scalex="..." scaley="..." />
  352: #
  353: # Unfortunately, GeoGebra seems to want all splines after everything else, so we need to store them
  354: #
  355: sub start_spline {
  356:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  357:    my $result='';
  358:    if ($target eq 'web') {
  359:       my $label=&Apache::lonxml::get_param('label',$parstack,$safeeval);
  360:       $Apache::functionplotresponse::counter++;
  361:       if ($label=~/\W/) {
  362:          &Apache::lonxml::warning(&mt('Spline labels should only contain alphanumeric characters.'));
  363:       }
  364:       $label=~s/\W//gs;
  365:       unless ($label) { $label='S'.$Apache::functionplotresponse::counter; }
  366:       if ($Apache::functionplotresponse::splineorder{$label}) {
  367:          &Apache::lonxml::error(&mt('Spline labels must be unique.'));
  368:       }
  369: 
  370:       my $order=&Apache::lonxml::get_param('order',$parstack,$safeeval);
  371:       if ($order<2) { $order=2; }
  372:       if ($order>8) { $order=8; }
  373:       $Apache::functionplotresponse::splineorder{$label}=$order;
  374: 
  375:       my $x=&Apache::lonxml::get_param('initx',$parstack,$safeeval);
  376:       unless ($x) { $x=0; }
  377:       $Apache::functionplotresponse::splineinitx{$label}=$x;
  378: 
  379:       my $y=&Apache::lonxml::get_param('inity',$parstack,$safeeval);
  380:       unless ($y) { $y=0; }
  381:       $Apache::functionplotresponse::splineinity{$label}=$y;
  382: 
  383:       my $sx=&Apache::lonxml::get_param('scalex',$parstack,$safeeval);
  384:       unless ($sx) { $sx=$order; }
  385:       $Apache::functionplotresponse::splinescalex{$label}=$sx;
  386: 
  387:       my $sy=&Apache::lonxml::get_param('scaley',$parstack,$safeeval);
  388:       unless ($sy) { $sy=2; }
  389:       $Apache::functionplotresponse::splinescaley{$label}=$sy;
  390:    } elsif ($target eq 'edit') {
  391:         $result=&Apache::edit::tag_start($target,$token,'Spline').
  392:              &Apache::edit::text_arg('Label:','label',
  393:                                      $token,'4').'&nbsp;'.
  394:              &Apache::edit::select_arg('Order:','order',
  395:                                   ['2','3','4','5','6','7','8','9'],$token).'&nbsp;'.
  396:              &Apache::edit::text_arg('Initial x-value:','initx',
  397:                                      $token,'4').'&nbsp;'.
  398:              &Apache::edit::text_arg('Initial y-value:','inity',
  399:                                      $token,'4').'&nbsp;'.
  400:              &Apache::edit::text_arg('Scale x:','scalex',
  401:                                      $token,'4').'&nbsp;'.
  402:              &Apache::edit::text_arg('Scale y:','scaley',
  403:                                      $token,'4').
  404:              &Apache::edit::end_row();
  405:   } elsif ($target eq 'modified') {
  406:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
  407:                                                  $safeeval,'label','order','initx','inity',
  408:                                                            'scalex','scaley');
  409:     if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
  410:   }
  411:   return $result;
  412: }
  413: 
  414: sub end_spline {
  415:    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  416:    my $result='';
  417:    if ($target eq 'edit') {
  418:        $result=&Apache::edit::end_table();
  419:    }
  420:    return $result;
  421: }
  422:  
  423: sub end_init_script {
  424:     return (<<ENDENDINIT);
  425: }
  426: // ]]>
  427: </script>
  428: ENDENDINIT
  429: }
  430: 
  431: #
  432: # Storing and restoring spline coordinates from part answers
  433: #
  434: sub decode_previous_answer {
  435:    my ($answer)=@_;
  436:    foreach my $coordinate (split(/\,/,$answer)) {
  437:       my ($key,$value)=split(/\=/,$coordinate);
  438:       $Apache::functionplotresponse::previous{$key}=$value;
  439:    }
  440: }
  441: 
  442: sub get_answer_from_form_fields {
  443:    my ($id)=@_;
  444:    my $answer='';
  445:    my %coords=();
  446:    foreach my $field (keys(%env)) {
  447:       if ($field=~/^form\.HWVAL\_$id/) {
  448:          $field=~/^form\.(.*)$/;
  449:          $coords{$1}=$env{$field};
  450:       }
  451:    }
  452:    $answer=join(',',map { $_.'='.$coords{$_} } (sort(keys(%coords))));
  453:    return ($answer,%coords);
  454: }
  455: 
  456: sub start_functionplotresponse {
  457:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  458:   my $result='';
  459: # To remember the splines - somehow, they need to come last
  460:   undef %Apache::functionplotresponse::splineorder;
  461:   undef %Apache::functionplotresponse::splineinitx;
  462:   undef %Apache::functionplotresponse::splineinity;
  463:   undef %Apache::functionplotresponse::splinescalex;
  464:   undef %Apache::functionplotresponse::splinescaley;
  465: # Remember input fields, etc
  466:   undef %Apache::functionplotresponse::previous;
  467:   $Apache::functionplotresponse::inputfields='';
  468:   $Apache::functionplotresponse::counter=0;
  469: # Part and ID
  470:   my $partid=$Apache::inputtags::part;
  471:   my $id=&Apache::response::start_response($parstack,$safeeval);
  472: # Internal ID to mark the applet and its coordinates
  473:   my $internalid = $partid.'_'.$id;
  474: # Previous answer
  475:   &decode_previous_answer($Apache::lonhomework::history{"resource.$partid.$id.submission"});
  476: 
  477: # Parameters of <functionplotresponse>
  478:   my $xmin=&Apache::lonxml::get_param('xmin',$parstack,$safeeval);
  479:   $xmin=($xmin?$xmin:-10);
  480:   my $xmax=&Apache::lonxml::get_param('xmax',$parstack,$safeeval);
  481:   $xmax=($xmax?$xmax:10);
  482:   my $ymin=&Apache::lonxml::get_param('ymin',$parstack,$safeeval);
  483:   $ymin=($ymin?$ymin:-10);
  484:   my $ymax=&Apache::lonxml::get_param('ymax',$parstack,$safeeval);
  485:   $ymax=($ymax?$ymax:10);
  486:   my $xaxisvisible=(&Apache::lonxml::get_param('xaxisvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
  487:   my $yaxisvisible=(&Apache::lonxml::get_param('yaxisvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
  488:   my $gridvisible=(&Apache::lonxml::get_param('gridvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
  489:   my $xlabel=&Apache::lonxml::get_param('xlabel',$parstack,$safeeval);
  490:   my $ylabel=&Apache::lonxml::get_param('ylabel',$parstack,$safeeval);
  491:   if ($target eq 'edit') {
  492:     $result.=&Apache::edit::start_table($token)
  493:        .'<tr><td><span class="LC_nobreak">'.&mt('Function Plot Question').'</span></td>'
  494:        .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
  495:        .&Apache::edit::deletelist($target,$token)
  496:        .'</span></td>'
  497:        ."<td>&nbsp;"
  498:        .&Apache::edit::end_row()
  499:        .&Apache::edit::start_spanning_row()
  500:        ."\n";
  501:     $result.=&Apache::edit::text_arg('Label x-axis:','xlabel',
  502:                                      $token,'6').'&nbsp;'.
  503:              &Apache::edit::text_arg('Minimum x-value:','xmin',
  504:                                      $token,'4').'&nbsp;'.
  505:              &Apache::edit::text_arg('Maximum x-value:','xmax',
  506:                                      $token,'4').'&nbsp;'.
  507:              &Apache::edit::select_arg('x-axis visible:','xaxisvisible',
  508:                                   ['yes','no'],$token).'&nbsp;&nbsp;'.
  509:              &Apache::edit::text_arg('Label y-axis:','ylabel',
  510:                                      $token,'6').'&nbsp;'.
  511:              &Apache::edit::text_arg('Minimum y-value:','ymin',
  512:                                      $token,'4').'&nbsp;'.
  513:              &Apache::edit::text_arg('Maximum y-value:','ymax',
  514:                                      $token,'4').'&nbsp;'.
  515:              &Apache::edit::select_arg('y-axis visible:','yaxisvisible',
  516:                                   ['yes','no'],$token).'&nbsp;&nbsp;'.
  517:              &Apache::edit::select_arg('Grid visible:','gridvisible',
  518:                                   ['yes','no'],$token).
  519:              &Apache::edit::end_row().&Apache::edit::start_spanning_row();
  520:   } elsif ($target eq 'modified') {
  521:     my $constructtag=&Apache::edit::get_new_args($token,$parstack,
  522:                                                  $safeeval,'xlabel','xmin','xmax','ylabel','ymin','ymax',
  523:                                                            'xaxisvisible','yaxisvisible','gridvisible');
  524:     if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
  525: 
  526:   } elsif ($target eq 'meta') {
  527:        $result=&Apache::response::meta_package_write('functionplotresponse');
  528:   } elsif ($target eq 'web') {
  529: # paste in the update routine to receive stuff back from the applet
  530:      $result.=&update_script($internalid);
  531: # start the initscript for this applet
  532:      $result.=&start_init_script($internalid);
  533: # put the axis commands inside
  534:      $result.=&axes_script($internalid,$xmin,$xmax,$ymin,$ymax,$xaxisvisible,$yaxisvisible,$gridvisible);
  535:      $result.=&axes_label($internalid,$xlabel,$ylabel);
  536: # init script is left open
  537:   }
  538:   return $result;
  539: }
  540: 
  541: sub end_functionplotresponse {
  542:   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  543:   &Apache::response::end_response;
  544: 
  545:   my $result;
  546:   my $id=$Apache::inputtags::response[-1];
  547:   my $partid=$Apache::inputtags::part;
  548:   my $internalid = $partid.'_'.$id;
  549: 
  550:     if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
  551:     if ($target eq 'grade'
  552:          && &Apache::response::submitted()
  553:          && $Apache::lonhomework::type eq 'exam') {
  554: 
  555:         #&Apache::response::scored_response($partid,$id);
  556: 
  557:     } elsif ($target eq 'grade'
  558:          && &Apache::response::submitted()
  559:          && $Apache::lonhomework::type ne 'exam') {
  560:         my ($response,%coords)=&get_answer_from_form_fields($internalid);
  561:         $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
  562:         my %previous=&Apache::response::check_for_previous($response,$partid,$id);
  563: #
  564: # Actually grade
  565: #
  566:         my $ad='INCORRECT';
  567: #
  568: # Store grading info
  569: #
  570:         $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
  571:         &Apache::response::handle_previous(\%previous,$ad);
  572:    } elsif ($target eq 'web') {
  573: # Now is the time to render all of the stored splines
  574:      foreach my $label (keys(%Apache::functionplotresponse::splineorder)) {
  575:         $result.=&generate_spline($internalid,$label);
  576:      }
  577: # close the init script
  578:      $result.=&end_init_script();
  579: # generate the input fields
  580:      $result.=$Apache::functionplotresponse::inputfields;
  581: # actually start the <applet>-tag
  582:      $result.=&geogebra_startcode($internalid);
  583: # load the spline bytecode
  584:      $result.=&geogebra_spline_program();
  585: # set default parameters
  586:      $result.=&geogebra_default_parameters($internalid);
  587: # close the <applet>-tag
  588:      $result.=&geogebra_endcode();
  589:   }
  590:   return $result;
  591: }
  592: 
  593: 1;
  594: 
  595: __END__
  596:  
  597: =head1 NAME
  598: 
  599: Apache::functionplotresponse.pm;
  600: 
  601: =head1 SYNOPSIS
  602: 
  603: Handles tags associated with accepting function plots.
  604: 
  605: This is part of the LearningOnline Network with CAPA project
  606: described at http://www.lon-capa.org.
  607: 
  608: =head1 HANDLER SUBROUTINE
  609: 
  610: start_functionplotresponse()
  611: 
  612: =head1 OTHER SUBROUTINES
  613: 
  614: =over
  615: 
  616: =item end_functionplotresponse()
  617: 
  618: =back
  619: 
  620: =cut