[LON-CAPA-cvs] cvs: loncom /homework functionplotresponse.pm
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www@source.lon-capa.org
Mon, 04 Oct 2010 20:47:29 -0000
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www Mon Oct 4 20:47:29 2010 EDT
Modified files:
/loncom/homework functionplotresponse.pm
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Index: loncom/homework/functionplotresponse.pm
diff -u loncom/homework/functionplotresponse.pm:1.4 loncom/homework/functionplotresponse.pm:1.5
--- loncom/homework/functionplotresponse.pm:1.4 Mon Oct 4 19:26:39 2010
+++ loncom/homework/functionplotresponse.pm Mon Oct 4 20:47:29 2010
@@ -1,7 +1,7 @@
# LearningOnline Network with CAPA
# option list style responses
#
-# $Id: functionplotresponse.pm,v 1.4 2010/10/04 19:26:39 www Exp $
+# $Id: functionplotresponse.pm,v 1.5 2010/10/04 20:47:29 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -36,6 +36,11 @@
&Apache::lonxml::register('Apache::functionplotresponse',('functionplotresponse','backgroundplot'));
}
+#
+# There can be a number of applets on a page, each called ggbApplet_$id,
+# where $id is the "_"-concatenated part and responseid
+#
+
sub geogebra_startcode {
my ($id)=@_;
return (<<ENDSTARTCODE);
@@ -49,12 +54,18 @@
return &Apache::lonhtmlcommon::java_not_enabled()."</applet>\n";
}
+#
+# This is the internal GeoGebra bytecode which defines the spline functions
+#
sub geogebra_spline_program {
return (<<ENDSPLINEPROGRAM);
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ENDSPLINEPROGRAM
}
+#
+# The standard set of parameters inside <applet>
+#
sub geogebra_default_parameters {
my ($id)=@_;
return(<<ENDDEFAULTPARAMETERS);
@@ -82,6 +93,13 @@
ENDDEFAULTPARAMETERS
}
+#
+# This subroutine is called by LON-CAPA at </problem>
+# Each applet on the page will call function ggbOnInit when it is done loading
+# This function in turn will call the respective function registered by start_init_script
+# Which one of the registered functions is called is determined by ggbOnInitParam, which GeoGebra passes to ggbOnInit
+#
+
sub init_script {
if ($Apache::functionplotresponse::callscripts) {
return (<<ENDGGBINIT);
@@ -96,16 +114,57 @@
}
}
+#
+# Each Geogebra applet is supposed to call this when parameters change
+#
+sub update_script {
+ my ($id)=@_;
+ return (<<ENDUPDATESCRIPT);
+<script type="text/javascript">
+// <![CDATA[
+function updatePointCoordinates_$id(coordinateName) {
+ var x = document.ggbApplet_$id.getXcoord(coordinateName);
+ var y = document.ggbApplet_$id.getYcoord(coordinateName);
+ coordinateMap_$id\[coordinateName + ".x"] = x;
+ coordinateMap_$id\[coordinateName + ".y"] = y;
+ }
+// ]]>
+</script>
+ENDUPDATESCRIPT
+}
+
+#
+# Register the above update-handler for a variable
+#
+
+sub update_register {
+ my ($id,$variable)=@_;
+ return "document.ggbApplet_$id.registerObjectUpdateListener('$variable','updatePointCoordinates_$id')";
+}
+
+#
+# This registers the init-function call for ggbOnInit, which LON-CAPA will place at </problem>
+# It then starts the right headers
+#
sub start_init_script {
my ($id)=@_;
+# Add a line to ggbOnInit-function which calls the right function based on parameter passed from GeoGebra
$Apache::functionplotresponse::callscripts.="if (param=='applet_$id') { ggbInit_$id(); }\n";
+# ... and open this function
return (<<ENDSTARTINIT);
<script type="text/javascript">
// <![CDATA[
+// variable that will eventually be passed back to the server
+var coordinateMap_$id = [];
+// Init-function for applet
function ggbInit_$id() {
ENDSTARTINIT
}
+#
+# This sets the axes inside ggbInit_$id
+#
+
sub axes_script {
my ($id,$xmin,$xmax,$ymin,$ymax,$xvisible,$yvisible,$gvisible)=@_;
return (<<ENDAXESSCRIPT);
@@ -126,6 +185,9 @@
ENDPLOTSCRIPT
}
+#
+# <backgroundplot function="..." />
+#
sub start_backgroundplot {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
@@ -165,10 +227,14 @@
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') {
+# paste in the update routine to receive stuff back from the applet
+ $result.=&update_script($internalid);
+# start the initscript for this applet
$result.=&start_init_script($internalid);
+# put the axis commands inside
$result.=&axes_script($internalid,$xmin,$xmax,$ymin,$ymax,$xaxisvisible,$yaxisvisible,$gridvisible);
+# init script is left open
}
return $result;
}
@@ -182,10 +248,15 @@
# if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
if ($target eq 'web') {
+# close the init script
$result.=&end_init_script();
+# actually start the <applet>-tag
$result.=&geogebra_startcode($internalid);
+# load the spline bytecode
$result.=&geogebra_spline_program();
+# set default parameters
$result.=&geogebra_default_parameters($internalid);
+# close the <applet>-tag
$result.=&geogebra_endcode();
}
return $result;
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