--- loncom/homework/functionplotresponse.pm	2010/10/04 14:34:43	1.2
+++ loncom/homework/functionplotresponse.pm	2010/10/04 19:26:39	1.4
@@ -1,7 +1,7 @@
 # LearningOnline Network with CAPA
 # option list style responses
 #
-# $Id: functionplotresponse.pm,v 1.2 2010/10/04 14:34:43 www Exp $
+# $Id: functionplotresponse.pm,v 1.4 2010/10/04 19:26:39 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -33,12 +33,13 @@ use Apache::lonlocal;
 use Apache::lonnet;
 
 BEGIN {
-  &Apache::lonxml::register('Apache::functionplotresponse',('functionplotresponse'));
+  &Apache::lonxml::register('Apache::functionplotresponse',('functionplotresponse','backgroundplot'));
 }
 
 sub geogebra_startcode {
+    my ($id)=@_;
     return (<<ENDSTARTCODE);
-<applet name="ggbApplet" code="geogebra.GeoGebraApplet" archive="geogebra.jar"
+<applet name="ggbApplet_$id" code="geogebra.GeoGebraApplet" archive="geogebra.jar"
          codebase="/adm/geogebra/"  width="714" height="447" MAYSCRIPT>
        <param name="java_arguments" value="-Xmx512m -Djnlp.packEnabled=true"/>
 ENDSTARTCODE
@@ -55,6 +56,7 @@ ENDSPLINEPROGRAM
 }
 
 sub geogebra_default_parameters {
+   my ($id)=@_;
    return(<<ENDDEFAULTPARAMETERS);
         <param name="image" value="/adm/lonIcons/lonanim.gif"  />
         <param name="boxborder" value="false"  />
@@ -76,18 +78,97 @@ sub geogebra_default_parameters {
         <param name="enableShiftDragZoom" value="false" />
         <param name="allowRescaling" value="false" />
         <param name="enableLabelDrags" value="false" />
-        <param name="ggbOnInitParam" value="applet1" />
+        <param name="ggbOnInitParam" value="applet_$id" />
 ENDDEFAULTPARAMETERS
 }
 
+sub init_script {
+   if ($Apache::functionplotresponse::callscripts) {
+      return (<<ENDGGBINIT);
+<script type="text/javascript">
+// <![CDATA[
+function ggbOnInit(param) {
+$Apache::functionplotresponse::callscripts
+}
+// ]]>
+</script>
+ENDGGBINIT
+   }
+}
+
+sub start_init_script {
+    my ($id)=@_;
+    $Apache::functionplotresponse::callscripts.="if (param=='applet_$id') { ggbInit_$id(); }\n";
+    return (<<ENDSTARTINIT);
+<script type="text/javascript">
+// <![CDATA[
+function ggbInit_$id() {
+ENDSTARTINIT
+}
+
+sub axes_script {
+    my ($id,$xmin,$xmax,$ymin,$ymax,$xvisible,$yvisible,$gvisible)=@_;
+    return (<<ENDAXESSCRIPT);
+            // changes (xmin, xmax, ymin, ymax)
+            document.ggbApplet_$id.setCoordSystem($xmin,$xmax,$ymin,$ymax);
+
+            // makes the (x,y) axis (in)visible
+            document.ggbApplet_$id.setAxesVisible($xvisible,$yvisible);
+            // makes the grid (in)visible
+            document.ggbApplet_$id.setGridVisible($gvisible);
+ENDAXESSCRIPT
+}
+
+sub plot_script {
+   my ($id,$function)=@_;
+   return (<<ENDPLOTSCRIPT);
+            document.ggbApplet_$id.evalCommand("y=$function");
+ENDPLOTSCRIPT
+}
+
+sub start_backgroundplot {
+   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+   my $result='';
+   my $internalid = $Apache::inputtags::part.'_'.$Apache::inputtags::response[-1];
+   my $function=&Apache::lonxml::get_param('function',$parstack,$safeeval);
+   unless ($function) { $function="0"; }
+   if ($target eq 'web') {
+      $result.=&plot_script($internalid,$function);
+   }
+   return $result;
+}
+
+sub end_backgroundplot {
+}
+ 
+sub end_init_script {
+    return (<<ENDENDINIT);
+}
+// ]]>
+</script>
+ENDENDINIT
+}
+
 sub start_functionplotresponse {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result='';
-  my $id = &Apache::response::start_response($parstack,$safeeval);
+  my $internalid = $Apache::inputtags::part.'_'.&Apache::response::start_response($parstack,$safeeval);
+  my $xmin=&Apache::lonxml::get_param('xmin',$parstack,$safeeval);
+  $xmin=($xmin?$xmin:-10);
+  my $xmax=&Apache::lonxml::get_param('xmax',$parstack,$safeeval);
+  $xmax=($xmax?$xmax:10);
+  my $ymin=&Apache::lonxml::get_param('ymin',$parstack,$safeeval);
+  $ymin=($ymin?$ymin:-10);
+  my $ymax=&Apache::lonxml::get_param('ymax',$parstack,$safeeval);
+  $ymax=($ymax?$ymax:10);
+  my $xaxisvisible=(&Apache::lonxml::get_param('xaxisvisible',$parstack,$safeeval)=~/on|true|1/i?'true':'false');
+  my $yaxisvisible=(&Apache::lonxml::get_param('yaxisvisible',$parstack,$safeeval)=~/on|true|1/i?'true':'false');
+  my $gridvisible=(&Apache::lonxml::get_param('gridvisible',$parstack,$safeeval)=~/on|true|1/i?'true':'false');
+
+
   if ($target eq 'web') {
-     $result.=&geogebra_startcode();
-     $result.=&geogebra_spline_program();
-     $result.=&geogebra_default_parameters();
+     $result.=&start_init_script($internalid);
+     $result.=&axes_script($internalid,$xmin,$xmax,$ymin,$ymax,$xaxisvisible,$yaxisvisible,$gridvisible);
   }
   return $result;
 }
@@ -95,9 +176,16 @@ sub start_functionplotresponse {
 sub end_functionplotresponse {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   &Apache::response::end_response;
+
   my $result;
+  my $internalid = $Apache::inputtags::part.'_'.$Apache::inputtags::response[-1];
+
 #  if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
   if ($target eq 'web') {
+     $result.=&end_init_script();
+     $result.=&geogebra_startcode($internalid);
+     $result.=&geogebra_spline_program();
+     $result.=&geogebra_default_parameters($internalid);
      $result.=&geogebra_endcode();
   }
   return $result;