--- loncom/homework/functionplotresponse.pm 2010/10/04 19:26:39 1.4
+++ loncom/homework/functionplotresponse.pm 2010/11/07 21:10:14 1.29
@@ -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 1.29 2010/11/07 21:10:14 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -33,9 +33,14 @@ use Apache::lonlocal;
use Apache::lonnet;
BEGIN {
- &Apache::lonxml::register('Apache::functionplotresponse',('functionplotresponse','backgroundplot'));
+ &Apache::lonxml::register('Apache::functionplotresponse',('functionplotresponse','backgroundplot','spline','functionplotrule'));
}
+#
+# 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 @@ sub geogebra_endcode {
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);
<param name="ggbBase64" value="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"/>
ENDSPLINEPROGRAM
}
+#
+# The standard set of parameters inside <applet>
+#
sub geogebra_default_parameters {
my ($id)=@_;
return(<<ENDDEFAULTPARAMETERS);
@@ -82,13 +93,33 @@ sub geogebra_default_parameters {
ENDDEFAULTPARAMETERS
}
+#
+# This subroutine is called by LON-CAPA at </problem>
+# Each applet on the page will call function ggbOnInit when it is done loading
+# This function in turn will call the respective function registered by start_init_script
+# Which one of the registered functions is called is determined by ggbOnInitParam, which GeoGebra passes to ggbOnInit
+#
+
sub init_script {
- if ($Apache::functionplotresponse::callscripts) {
+ if ($#Apache::functionplotresponse::callscripts>=0) {
+ my $script='';
+ foreach my $id (@Apache::functionplotresponse::callscripts) {
+ $script.="if (param=='applet_$id') { loaded_$id=true; }\n";
+ }
+ $script.="if (".join(' && ',map { "loaded_$_" } (@Apache::functionplotresponse::callscripts)).
+ ") { setTimeout('ggbInitAll()',20) }";
+ my $calls=join("\n",map { "ggbInit_$_();" } (@Apache::functionplotresponse::callscripts));
return (<<ENDGGBINIT);
<script type="text/javascript">
// <![CDATA[
+// Function that each applet will call when loaded
+// It will pass "its" parameter
+// Set flags for when an applet is loaded, wait till all are loaded, and then some
function ggbOnInit(param) {
-$Apache::functionplotresponse::callscripts
+$script
+}
+function ggbInitAll() {
+$calls
}
// ]]>
</script>
@@ -96,16 +127,105 @@ ENDGGBINIT
}
}
+#
+# Each Geogebra applet is supposed to call this when parameters change
+# Changes the hidden fields on the web page
+#
+sub update_script {
+ my ($id)=@_;
+ return (<<ENDUPDATESCRIPT);
+<script type="text/javascript">
+// <![CDATA[
+function updatePointCoordinates_$id(coordinateName) {
+ var x = document.ggbApplet_$id.getXcoord(coordinateName);
+ var y = document.ggbApplet_$id.getYcoord(coordinateName);
+ document.lonhomework.elements["HWVAL_$id\_" + coordinateName + "_x"].value = x;
+ document.lonhomework.elements["HWVAL_$id\_" + coordinateName + "_y"].value = y;
+ }
+// ]]>
+</script>
+ENDUPDATESCRIPT
+}
+
+#
+# Register the above update-handler for a variable
+#
+
+sub update_register {
+ my ($id,$variable)=@_;
+ return "document.ggbApplet_$id.registerObjectUpdateListener('$variable','updatePointCoordinates_$id');\n";
+}
+
+#
+# Set a coordinate variable
+#
+sub set_coordinate {
+ my ($id,$variable,$x,$y)=@_;
+ return (<<ENDSETVARIABLE);
+document.ggbApplet_$id.evalCommand("$variable=($x,$y)");
+ENDSETVARIABLE
+}
+
+#
+# Input field name for a coordinate variable
+#
+
+sub field_name {
+ my ($id,$variable,$name)=@_;
+ return "HWVAL_$id\_$variable\_$name";
+}
+
+#
+# Generate an input field for a coordinate variable
+#
+
+sub generate_input_field {
+ my ($id,$variable,$x,$y)=@_;
+ $Apache::functionplotresponse::inputfields.=
+ "<input type='hidden' name='".&field_name($id,$variable,'x')."' value='$x' />\n".
+ "<input type='hidden' name='".&field_name($id,$variable,'y')."' value='$y' />\n";
+}
+
+#
+# Initialize a new coordinate variable at set a listener on it
+#
+sub new_coordinate {
+ my ($id,$variable,$x,$y)=@_;
+ if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'x')})) {
+ $x=$Apache::functionplotresponse::previous{&field_name($id,$variable,'x')};
+ }
+ if (defined($Apache::functionplotresponse::previous{&field_name($id,$variable,'y')})) {
+ $y=$Apache::functionplotresponse::previous{&field_name($id,$variable,'y')};
+ }
+ &generate_input_field($id,$variable,$x,$y);
+ return &set_coordinate($id,$variable,$x,$y).&update_register($id,$variable);
+}
+
+#
+# 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)=@_;
- $Apache::functionplotresponse::callscripts.="if (param=='applet_$id') { ggbInit_$id(); }\n";
+# Add id to the list of ggbInit_$id functions that need to be called
+ push(@Apache::functionplotresponse::callscripts,$id);
+# ... and open this function
return (<<ENDSTARTINIT);
<script type="text/javascript">
// <![CDATA[
+// variable that will eventually be passed back to the server
+var coordinateMap_$id = [];
+// flag for not loaded yet
+var loaded_$id=false;
+// Init-function for applet
function ggbInit_$id() {
ENDSTARTINIT
}
+#
+# This sets the axes inside ggbInit_$id
+#
+
sub axes_script {
my ($id,$xmin,$xmax,$ymin,$ymax,$xvisible,$yvisible,$gvisible)=@_;
return (<<ENDAXESSCRIPT);
@@ -119,26 +239,276 @@ sub axes_script {
ENDAXESSCRIPT
}
+sub axes_label {
+ my ($id,$xlabel,$ylabel)=@_;
+ unless ($xlabel || $ylabel) { return ''; }
+ my $return='document.ggbApplet_'.$id.'.evalCommand("topRight=Corner[3]");';
+ if ($xlabel) {
+ $return.=(<<ENDXAXISLABELSCRIPT);
+document.ggbApplet_$id.evalCommand("Xlabel=(x(topRight)-AxisStepX[],AxisStepY[]/6)");
+document.ggbApplet_$id.setVisible("Xlabel",false);
+document.ggbApplet_$id.evalCommand("Text[\\"$xlabel\\", Xlabel]");
+ENDXAXISLABELSCRIPT
+ }
+ if ($ylabel) {
+ $return.=(<<ENDYAXISLABELSCRIPT);
+document.ggbApplet_$id.evalCommand("Ylabel=(AxisStepX[]/6,y(topRight)-AxisStepY[]/3)");
+document.ggbApplet_$id.setVisible("Ylabel",false);
+document.ggbApplet_$id.evalCommand("Text[\\"$ylabel\\", Ylabel]");
+ENDYAXISLABELSCRIPT
+ }
+ return $return;
+}
+
sub plot_script {
- my ($id,$function)=@_;
- return (<<ENDPLOTSCRIPT);
- document.ggbApplet_$id.evalCommand("y=$function");
+ my ($id,$function,$fixed)=@_;
+ if ($fixed) {
+# Use stupid trick to nail this to a location
+# Oddly, it seems like only one plot cannot be nailed to a location
+# Non-nailed-down plots apparently get overwritten
+ return (<<ENDPLOTSCRIPT);
+ document.ggbApplet_$id.evalCommand("a=1");
+ document.ggbApplet_$id.setVisible("a",false);
+ // This MUST be a DEPENDENT OBJECT in order to be locked down:
+ document.ggbApplet_$id.evalCommand("y=a*($function)");
ENDPLOTSCRIPT
+ } else {
+ return "document.ggbApplet_$id.evalCommand('y=$function')";
+ }
}
+#
+# Subroutine that generates code for spline $label based on stored information
+#
+
+sub generate_spline {
+ my ($id,$label)=@_;
+ my $result='';
+ my $order=$Apache::functionplotresponse::splineorder{$label};
+ my $x=$Apache::functionplotresponse::splineinitx{$label};
+ my $y=$Apache::functionplotresponse::splineinity{$label};
+ my $sx=$Apache::functionplotresponse::splinescalex{$label};
+ my $sy=$Apache::functionplotresponse::splinescaley{$label};
+ my @coords=();
+ foreach my $i (1..$order) {
+ $result.=&new_coordinate($id,$label.'P'.$i,$x,$y);
+ $x+=$sx/(2.*($order-1));
+ push(@coords,$label.'P'.$i);
+ $result.=&new_coordinate($id,$label.'S'.$i,$x,$y+$sy);
+ $x+=$sx/(2.*($order-1));
+ push(@coords,$label.'S'.$i);
+ }
+ $result.='document.ggbApplet_'.$id.'.evalCommand("Spline'.$order.'['.join(',',@coords).']");'."\n";
+ return $result;
+}
+#
+# <backgroundplot function="..." fixed="yes/no" />
+#
sub start_backgroundplot {
my ($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);
+ my $fixed=(&Apache::lonxml::get_param('fixed',$parstack,$safeeval)=~/on|true|yes|1/i?1:0);
+
unless ($function) { $function="0"; }
if ($target eq 'web') {
- $result.=&plot_script($internalid,$function);
+ $result.=&plot_script($internalid,$function,$fixed);
+ } elsif ($target eq 'edit') {
+ $result=&Apache::edit::tag_start($target,$token,'Background Function Plot').
+ &Apache::edit::text_arg('Function:','function',
+ $token,'16').
+ &Apache::edit::select_arg('Fixed location:','fixed',
+ ['yes','no'],$token).
+ &Apache::edit::end_row();
+ } elsif ($target eq 'modified') {
+ my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+ $safeeval,'function','fixed');
+ if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
+ }
+ return $result;
+}
+
+sub end_backgroundplot {
+ my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+ my $result='';
+ if ($target eq 'edit') {
+ $result=&Apache::edit::end_table();
}
return $result;
}
-sub end_backgroundplot {
+#
+# <functionplotrule ... />
+#
+sub start_functionplotrule {
+ my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+ my $result='';
+ my $label=&Apache::lonxml::get_param('index',$parstack,$safeeval);
+ $Apache::functionplotresponse::counter++;
+ if ($label=~/\W/) {
+ &Apache::lonxml::warning(&mt('Rule indices should only contain alphanumeric characters.'));
+ }
+ $label=~s/\W//gs;
+ unless ($label) {
+ $label='R'.$Apache::functionplotresponse::counter;
+ } else {
+ $label='R'.$label;
+ }
+ if ($Apache::functionplotresponse::splineorder{$label}) {
+ &Apache::lonxml::error(&mt('Rule indices must be unique.'));
+ }
+
+
+ if ($target eq 'grade') {
+# Simply remember - in order - for later
+ my $beginninglabel=&Apache::lonxml::get_param('xinitiallabel',$parstack,$safeeval);
+ my $endinglabel=&Apache::lonxml::get_param('xfinallabel',$parstack,$safeeval);
+ if (($beginninglabel=~/\W/) || ($endinglabel=~/W/)) {
+ &Apache::lonxml::warning(&mt('Rule labels must be alphanumeric.'));
+ }
+ $beginninglabel=~s/\W//gs;
+ $endinglabel=~s/\W//gs;
+ my $relationship=&Apache::lonxml::get_param('relationship',$parstack,$safeeval);
+ $relationship=~s/\W//gs;
+ $relationship=lc($relationship);
+ unless ($relationship=~/^(eq|ge|gt|le|lt|ne)$/) {
+ &Apache::lonxml::warning(&mt('Rule relationship not defined.'));
+ $relationship='eq';
+ }
+ my $derivative=&Apache::lonxml::get_param('derivative',$parstack,$safeeval);
+ unless (($derivative==0) || ($derivative==1) || ($derivative==2)) {
+ &Apache::lonxml::warning(&mt('Rule derivative not defined.'));
+ $derivative=0;
+ }
+ push(@Apache::functionplotresponse::functionplotrules,join(':',(
+ $label,
+ $derivative,
+ &Apache::lonxml::get_param('xinitial',$parstack,$safeeval),
+ $beginninglabel,
+ &Apache::lonxml::get_param('xfinal',$parstack,$safeeval),
+ $endinglabel,
+ $relationship,
+ &Apache::lonxml::get_param('value',$parstack,$safeeval)
+ )));
+ } elsif ($target eq 'edit') {
+ $result=&Apache::edit::tag_start($target,$token,'Function Plot Evaluation Rule').
+ &Apache::edit::text_arg('Index:','index',
+ $token,'4').' '.
+ &Apache::edit::select_arg(&mt('Function:'),'derivative',
+ [['0','Function itself'],
+ ['1','First derivative'],
+ ['2','Second derivative']],$token).
+ &Apache::edit::text_arg('(Initial) x-value:','xinitial',
+ $token,'4').' '.
+ &Apache::edit::text_arg('Final x-value for ranges:','xfinal',
+ $token,'4').' '.
+ &Apache::edit::select_arg(&mt('Relationship:'),'relationship',
+ [['eq','equal'],
+ ['ne','not equal'],
+ ['ge','greater than or equal'],
+ ['gt','greater than'],
+ ['lt','less than'],
+ ['le','less than or equal']],$token).
+ $result.= &Apache::edit::select_or_text_arg('Value:','value',
+ [['undef','not defined']],$token,'4').
+ &Apache::edit::text_arg('Percent error:','percenterror',
+ $token,'4').
+ &Apache::edit::end_row();
+ } elsif ($target eq 'modified') {
+ my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+ $safeeval,'index','derivative','xinitial','xfinal','relationship',
+ 'value','percenterror');
+ if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
+ }
+ return $result;
+}
+
+sub end_functionplotrule {
+ my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+ my $result='';
+ if ($target eq 'edit') {
+ $result=&Apache::edit::end_table();
+ }
+ return $result;
+}
+
+
+#
+# <spline index="..." order="1,2,3,4" initx="..." inity="..." scalex="..." scaley="..." />
+#
+# Unfortunately, GeoGebra seems to want all splines after everything else, so we need to store them
+#
+sub start_spline {
+ my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+ my $result='';
+ if ($target eq 'web') {
+ my $label=&Apache::lonxml::get_param('index',$parstack,$safeeval);
+ $Apache::functionplotresponse::counter++;
+ if ($label=~/\W/) {
+ &Apache::lonxml::warning(&mt('Spline indices should only contain alphanumeric characters.'));
+ }
+ $label=~s/\W//gs;
+ unless ($label) {
+ $label='S'.$Apache::functionplotresponse::counter;
+ } else {
+ $label='S'.$label;
+ }
+ if ($Apache::functionplotresponse::splineorder{$label}) {
+ &Apache::lonxml::error(&mt('Spline indices must be unique.'));
+ }
+
+ my $order=&Apache::lonxml::get_param('order',$parstack,$safeeval);
+ if ($order<2) { $order=2; }
+ if ($order>8) { $order=8; }
+ $Apache::functionplotresponse::splineorder{$label}=$order;
+
+ my $x=&Apache::lonxml::get_param('initx',$parstack,$safeeval);
+ unless ($x) { $x=0; }
+ $Apache::functionplotresponse::splineinitx{$label}=$x;
+
+ my $y=&Apache::lonxml::get_param('inity',$parstack,$safeeval);
+ unless ($y) { $y=0; }
+ $Apache::functionplotresponse::splineinity{$label}=$y;
+
+ my $sx=&Apache::lonxml::get_param('scalex',$parstack,$safeeval);
+ unless ($sx) { $sx=$order; }
+ $Apache::functionplotresponse::splinescalex{$label}=$sx;
+
+ my $sy=&Apache::lonxml::get_param('scaley',$parstack,$safeeval);
+ unless ($sy) { $sy=2; }
+ $Apache::functionplotresponse::splinescaley{$label}=$sy;
+ } elsif ($target eq 'edit') {
+ $result=&Apache::edit::tag_start($target,$token,'Spline').
+ &Apache::edit::text_arg('Index:','index',
+ $token,'4').' '.
+ &Apache::edit::select_arg('Order:','order',
+ ['2','3','4','5','6','7','8','9'],$token).' '.
+ &Apache::edit::text_arg('Initial x-value:','initx',
+ $token,'4').' '.
+ &Apache::edit::text_arg('Initial y-value:','inity',
+ $token,'4').' '.
+ &Apache::edit::text_arg('Scale x:','scalex',
+ $token,'4').' '.
+ &Apache::edit::text_arg('Scale y:','scaley',
+ $token,'4').
+ &Apache::edit::end_row();
+ } elsif ($target eq 'modified') {
+ my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+ $safeeval,'index','order','initx','inity',
+ 'scalex','scaley');
+ if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
+ }
+ return $result;
+}
+
+sub end_spline {
+ my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+ my $result='';
+ if ($target eq 'edit') {
+ $result=&Apache::edit::end_table();
+ }
+ return $result;
}
sub end_init_script {
@@ -149,43 +519,405 @@ sub end_init_script {
ENDENDINIT
}
+#
+# Storing and restoring spline coordinates from part answers
+#
+sub decode_previous_answer {
+ my ($answer)=@_;
+ foreach my $coordinate (split(/\,/,$answer)) {
+ my ($key,$value)=split(/\=/,$coordinate);
+ $Apache::functionplotresponse::previous{$key}=$value;
+ }
+}
+
+sub get_answer_from_form_fields {
+ my ($id)=@_;
+ my $answer='';
+ my %coords=();
+ foreach my $field (keys(%env)) {
+ if ($field=~/^form\.HWVAL\_$id/) {
+ $field=~/^form\.(.*)$/;
+ $coords{$1}=$env{$field};
+ }
+ }
+ $answer=join(',',map { $_.'='.$coords{$_} } (sort(keys(%coords))));
+ return ($answer,%coords);
+}
+
+#
+# The following functions calculate the cubic-hermite splines server-side
+#
+
+sub cubic_hermite {
+ my ($t,$p1,$s1,$p2,$s2)=@_;
+ return (2.*$t*$t*$t-3.*$t*$t+1.)*$p1 + 5.*($t*$t*$t-2.*$t*$t+$t)*($s1-$p1)+
+ (-2.*$t*$t*$t+3.*$t*$t) *$p2 + 5.*($t*$t*$t-$t*$t) *($s2-$p2);
+}
+
+#
+# d/dt(...)
+#
+
+sub ddt_cubic_hermite {
+ my ($t,$p1,$s1,$p2,$s2)=@_;
+ return (6.*$t*$t-6.*$t) *$p1 + 5.*(3.*$t*$t-4.*$t+1.)*($s1-$p1)+
+ (-6.*$t*$t+6.*$t)*$p2 + 5.*(3.*$t*$t-2.*$t) *($s2-$p2);
+}
+
+#
+# d^2/dt^2(...)
+#
+
+sub d2dt2_cubic_hermite {
+ my ($t,$p1,$s1,$p2,$s2)=@_;
+ return (12.*$t-6.) *$p1 + 5.*(6.*$t-4.)*($s1-$p1)+
+ (-12.*$t+6.)*$p2 + 5.*(6.*$t-2.)*($s2-$p2);
+}
+
+#
+# Array index calculation
+#
+sub array_index {
+ my ($xmin,$xmax,$x)=@_;
+ return int(($x-$xmin)/($xmax-$xmin)*400.+0.5);
+}
+
+#
+# Populate the arrays
+#
+
+sub populate_arrays {
+ my ($id,$xmin,$xmax)=@_;
+ for (my $i=0; $i<=400; $i++) {
+ $Apache::functionplotresponse::func[$i]=undef;
+ $Apache::functionplotresponse::dfuncdx[$i]=undef;
+ $Apache::functionplotresponse::d2funcd2x[$i]=undef;
+ }
+ unless ($xmax>$xmin) { return 'no_func'; }
+# Run over all splines in response
+ foreach my $label (split(/\,/,$env{"form.HWVAL_AllSplines_$id"})) {
+ my $xiold=-1;
+# Run over all points in spline
+ for (my $i=1; $i<$env{"form.HWVAL_SplineOrder_".$id."_".$label}; $i++) {
+ my $ni=$i+1;
+ my @xparms=($env{'form.HWVAL_'.$id.'_'.$label.'P'.$i.'_x'},
+ $env{'form.HWVAL_'.$id.'_'.$label.'S'.$i.'_x'},
+ $env{'form.HWVAL_'.$id.'_'.$label.'P'.$ni.'_x'},
+ $env{'form.HWVAL_'.$id.'_'.$label.'S'.$ni.'_x'});
+ my @yparms=($env{'form.HWVAL_'.$id.'_'.$label.'P'.$i.'_y'},
+ $env{'form.HWVAL_'.$id.'_'.$label.'S'.$i.'_y'},
+ $env{'form.HWVAL_'.$id.'_'.$label.'P'.$ni.'_y'},
+ $env{'form.HWVAL_'.$id.'_'.$label.'S'.$ni.'_y'});
+# Run in small steps over spline parameter
+ for (my $t=0; $t<=1; $t+=0.0001) {
+ my $xi=&array_index($xmin,$xmax,&cubic_hermite($t,@xparms));
+ if ($xi<$xiold) { return 'no_func'; }
+ if (($xi>$xiold) && ($xi>=0) && ($xi<=400)) {
+ if (defined($Apache::functionplotresponse::func[$xi])) { return 'no_func'; }
+ $xiold=$xi;
+# Function value
+ $Apache::functionplotresponse::func[$xi]=&cubic_hermite($t,@yparms);
+# Chain rule
+# dy/dx=dy/dt/(dx/dt)
+ my $dxdt=&ddt_cubic_hermite($t,@xparms);
+ if ($dxdt) {
+ $Apache::functionplotresponse::dfuncdx[$xi]=&ddt_cubic_hermite($t,@yparms)/$dxdt;
+ }
+# Faa di Bruno
+# d^2y/dx^2=(d^2y/dt^2)/(dx/dt)^2+(dy/dt)/(d^2x/dt^2)
+ my $d2xdt2=&d2dt2_cubic_hermite($t,@xparms);
+ if (($dxdt) && ($d2xdt2)) {
+ $Apache::functionplotresponse::d2funcdx2[$xi]=
+ &d2dt2_cubic_hermite($t,@yparms)/($dxdt*$dxdt)
+ +&ddt_cubic_hermite($t,@yparms)/$d2xdt2;
+ }
+ }
+ }
+ }
+ }
+}
+
+#
+# Implentation of <functionplotresponse>
+#
+
sub start_functionplotresponse {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';
- my $internalid = $Apache::inputtags::part.'_'.&Apache::response::start_response($parstack,$safeeval);
+# To remember the splines - somehow, they need to come last
+ undef %Apache::functionplotresponse::splineorder;
+ undef %Apache::functionplotresponse::splineinitx;
+ undef %Apache::functionplotresponse::splineinity;
+ undef %Apache::functionplotresponse::splinescalex;
+ undef %Apache::functionplotresponse::splinescaley;
+# Remember input fields, etc
+ undef %Apache::functionplotresponse::previous;
+ $Apache::functionplotresponse::inputfields='';
+ $Apache::functionplotresponse::counter=0;
+# Remember rules
+ undef @Apache::functionplotresponse::functionplotrules;
+# Part and ID
+ my $partid=$Apache::inputtags::part;
+ my $id=&Apache::response::start_response($parstack,$safeeval);
+# Internal ID to mark the applet and its coordinates
+ my $internalid = $partid.'_'.$id;
+# Previous answer
+ &decode_previous_answer($Apache::lonhomework::history{"resource.$partid.$id.submission"});
+
+# Parameters of <functionplotresponse>
my $xmin=&Apache::lonxml::get_param('xmin',$parstack,$safeeval);
- $xmin=($xmin?$xmin:-10);
+ $xmin=(defined($xmin)?$xmin:-10);
my $xmax=&Apache::lonxml::get_param('xmax',$parstack,$safeeval);
- $xmax=($xmax?$xmax:10);
+ $xmax=(defined($xmax)?$xmax:10);
my $ymin=&Apache::lonxml::get_param('ymin',$parstack,$safeeval);
- $ymin=($ymin?$ymin:-10);
+ $ymin=(defined($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') {
+ $ymax=(defined($ymax)?$ymax:10);
+ if ($xmax<=$xmin) {
+ &Apache::lonxml::warning('Maximum x-value needs to be larger than minimum value.');
+ $xmax=$xmin+20;
+ }
+ if ($ymax<=$ymin) {
+ &Apache::lonxml::warning('Maximum y-value needs to be larger than minimum value.');
+ $ymax=$ymin+20;
+ }
+ my $xaxisvisible=(&Apache::lonxml::get_param('xaxisvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
+ my $yaxisvisible=(&Apache::lonxml::get_param('yaxisvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
+ my $gridvisible=(&Apache::lonxml::get_param('gridvisible',$parstack,$safeeval)=~/on|true|yes|1/i?'true':'false');
+ my $xlabel=&Apache::lonxml::get_param('xlabel',$parstack,$safeeval);
+ my $ylabel=&Apache::lonxml::get_param('ylabel',$parstack,$safeeval);
+ if ($target eq 'edit') {
+ $result.=&Apache::edit::start_table($token)
+ .'<tr><td><span class="LC_nobreak">'.&mt('Function Plot Question').'</span></td>'
+ .'<td><span class="LC_nobreak">'.&mt('Delete?').' '
+ .&Apache::edit::deletelist($target,$token)
+ .'</span></td>'
+ ."<td> "
+ .&Apache::edit::end_row()
+ .&Apache::edit::start_spanning_row()
+ ."\n";
+ $result.=&Apache::edit::text_arg('Label x-axis:','xlabel',
+ $token,'6').' '.
+ &Apache::edit::text_arg('Minimum x-value:','xmin',
+ $token,'4').' '.
+ &Apache::edit::text_arg('Maximum x-value:','xmax',
+ $token,'4').' '.
+ &Apache::edit::select_arg('x-axis visible:','xaxisvisible',
+ ['yes','no'],$token).' '.
+ &Apache::edit::text_arg('Label y-axis:','ylabel',
+ $token,'6').' '.
+ &Apache::edit::text_arg('Minimum y-value:','ymin',
+ $token,'4').' '.
+ &Apache::edit::text_arg('Maximum y-value:','ymax',
+ $token,'4').' '.
+ &Apache::edit::select_arg('y-axis visible:','yaxisvisible',
+ ['yes','no'],$token).' '.
+ &Apache::edit::select_arg('Grid visible:','gridvisible',
+ ['yes','no'],$token).
+ &Apache::edit::end_row().&Apache::edit::start_spanning_row();
+ } elsif ($target eq 'modified') {
+ my $constructtag=&Apache::edit::get_new_args($token,$parstack,
+ $safeeval,'xlabel','xmin','xmax','ylabel','ymin','ymax',
+ 'xaxisvisible','yaxisvisible','gridvisible');
+ if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
+
+ } elsif ($target eq 'meta') {
+ $result=&Apache::response::meta_package_write('functionplotresponse');
+ } elsif ($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);
+ $result.=&axes_label($internalid,$xlabel,$ylabel);
+# init script is left open
}
return $result;
}
+sub compare_rel {
+ my ($relationship,$value,$realval,$tol)=@_;
+
+
+ &Apache::lonnet::logthis("Rel $relationship Val $value RV $realval T $tol");
+# is the real value defined?
+ unless (defined($realval)) {
+ if ($relationship eq 'eq') {
+ if ($value eq 'undef') {
+ return 1;
+ } else {
+ return 0;
+ }
+ } elsif ($relationship eq 'ne') {
+ if ($value eq 'undef') {
+ return 0;
+ } else {
+ return 1;
+ }
+ } else {
+ return 0;
+ }
+ }
+
+# it is defined.
+ if ($relationship eq 'gt') {
+ return ($realval>$value);
+ } elsif ($relationship eq 'ge') {
+ return ($realval>$value-$tol);
+ } elsif ($relationship eq 'lt') {
+ return ($realval<$value);
+ } elsif ($relationship eq 'le') {
+ return ($realval<$value+$tol);
+ } elsif ($relationship eq 'ne') {
+ return (abs($value-$realval)>$tol);
+ } else {
+ return (abs($value-$realval)<$tol);
+ }
+ return 0;
+}
+
+sub functionplotrulecheck {
+ my ($rule,$xmin,$xmax,$tolfunc,$toldfdx,$told2fdx2)=@_;
+ &Apache::lonnet::logthis("Rule $rule TolFunc $tolfunc TolDfDx $toldfdx TolD2fDx2 $told2fdx2");
+ my ($label,$derivative,$xinitial,$xinitiallabel,$xfinal,$xfinallabel,$relationship,$value)
+ =split(/\:/,$rule);
+# if a hard value is set for the boundaries, it overrides the label
+ if (($xinitial ne '') && ($xinitiallabel ne '')) {
+ $Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel}=$xinitial;
+ }
+ if (($xfinal ne '') && ($xfinallabel ne '')) {
+ $Apache::functionplotresponse::functionplotrulelabels{$xfinallabel}=$xfinal;
+ }
+ if (defined($Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel})) {
+ $xinitial=$Apache::functionplotresponse::functionplotrulelabels{$xinitiallabel};
+ }
+ if (defined($Apache::functionplotresponse::functionplotrulelabels{$xfinallabel})) {
+ $xfinal=$Apache::functionplotresponse::functionplotrulelabels{$xfinallabel};
+ }
+# Basic sanity checks
+ if ($xinitial eq '') {
+ $xinitial=0;
+ }
+ if ($xfinal eq '') {
+ $xfinal=$xinitial;
+ }
+ if ($xinitial>$xfinal) {
+ $xfinal=$xinitial;
+ }
+ &Apache::lonnet::logthis("Init $xinitial Final $xfinal");
+ my $tol=$tolfunc;
+ if ($derivative==2) {
+ $tol=$told2fdx2;
+ } elsif ($derivative==1) {
+ $tol=$toldfdx;
+ }
+
+ my $li=&array_index($xmin,$xmax,$xinitial);
+ my $lh=&array_index($xmin,$xmax,$xfinal);
+ for (my $i=$li; $i<=$lh; $i++) {
+ my $val;
+ if ($derivative==2) {
+ $val=$Apache::functionplotresponse::d2funcdx2[$i];
+ } elsif ($derivative==1) {
+ $val=$Apache::functionplotresponse::dfuncdx[$i];
+ } else {
+ $val=$Apache::functionplotresponse::func[$i];
+ }
+ unless (&compare_rel($relationship,$value,$val,$tol)) { return 0; };
+ }
+ return 1;
+}
+
sub end_functionplotresponse {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
&Apache::response::end_response;
my $result;
- my $internalid = $Apache::inputtags::part.'_'.$Apache::inputtags::response[-1];
+ my $id=$Apache::inputtags::response[-1];
+ my $partid=$Apache::inputtags::part;
+ my $internalid = $partid.'_'.$id;
+
+ if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
+ if ($target eq 'grade'
+ && &Apache::response::submitted()
+ && $Apache::lonhomework::type eq 'exam') {
+
+ &Apache::response::scored_response($partid,$id);
+
+ } elsif ($target eq 'grade'
+ && &Apache::response::submitted()
+ && $Apache::lonhomework::type ne 'exam') {
+ my ($response,%coords)=&get_answer_from_form_fields($internalid);
+ $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
+ my %previous=&Apache::response::check_for_previous($response,$partid,$id);
+#
+# Actually grade
+#
+ my $xmin=&Apache::lonxml::get_param('xmin',$parstack,$safeeval);
+ $xmin=(defined($xmin)?$xmin:-10);
+ my $xmax=&Apache::lonxml::get_param('xmax',$parstack,$safeeval);
+ $xmax=(defined($xmax)?$xmax:10);
+ my $ymin=&Apache::lonxml::get_param('ymin',$parstack,$safeeval);
+ $ymin=(defined($ymin)?$ymin:-10);
+ my $ymax=&Apache::lonxml::get_param('ymax',$parstack,$safeeval);
+ $ymax=(defined($ymax)?$ymax:10);
+
+ my $percent=&Apache::lonxml::get_param('percenterror',$parstack,$safeeval);
+ $percent=(defined($percent)?$percent:5);
+
+ my $tolfunc=$percent*($ymax-$ymin)/100.;
+ my $toldfdx=1;
+ my $told2fdx2=1;
+ if ($xmax>$xmin) {
+ $toldfdx=$tolfunc/($xmax-$xmin);
+ $told2fdx2=$toldfdx/($xmax-$xmin);
+ }
+
+ my $ad='';
+ if (&populate_arrays($internalid,$xmin,$xmax) eq 'no_func') {
+ $ad='NOT_FUNCTION';
+ } else {
+# We have a function that we can actually grade, go through the spline rules.
+ undef %Apache::functionplotresponse::functionplotrulelabels;
+ foreach my $rule (@Apache::functionplotresponse::functionplotrules) {
+ unless (&functionplotrulecheck($rule,$xmin,$xmax,$tolfunc,$toldfdx,$told2fdx2)) {
+ $ad='INCORRECT';
+ last;
+ }
+ }
+# If it's not wrong, it's correct
+ unless ($ad) { $ad='EXACT_ANS' };
+ }
-# if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
- if ($target eq 'web') {
+#
+# Store grading info
+#
+ $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
+ &Apache::response::handle_previous(\%previous,$ad);
+ } elsif ($target eq 'web') {
+# Now is the time to render all of the stored splines
+ foreach my $label (keys(%Apache::functionplotresponse::splineorder)) {
+ $result.=&generate_spline($internalid,$label);
+ }
+# close the init script
$result.=&end_init_script();
+# register all splines in this response
+ $result.='<input type="hidden" name="HWVAL_AllSplines_'.$internalid.'" value="'.
+ join(',',keys(%Apache::functionplotresponse::splineorder)).'" />'."\n";
+ foreach my $label (keys(%Apache::functionplotresponse::splineorder)) {
+ $result.='<input type="hidden" name="HWVAL_SplineOrder_'.$internalid.'_'.$label.'" value="'.
+ $Apache::functionplotresponse::splineorder{$label}.'" />'."\n";
+ }
+# generate the input fields
+ $result.=$Apache::functionplotresponse::inputfields;
+# 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;