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a little more beauty

# The LON-CAPA image response handler
# 
# Image click response style
#
# YEAR=2001
# 2/7,2/9,2/22,3/1,5/4,5/15,5/31,6/2,6/26 Guy Albertelli
# 8/6 Scott Harrison

#FIXME assumes multiple possible submissions but only one is possible currently

package Apache::imageresponse;
use strict;

# ======================================================================= BEGIN
sub BEGIN {
    &Apache::lonxml::register('Apache::imageresponse',('imageresponse'));
}

# ======================================================== Start image response
sub start_imageresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    #when in a radiobutton response use these
    &Apache::lonxml::register('Apache::imageresponse',('foilgroup','foil',
						       'text','image',
						       'rectangle',
						       'conceptgroup'));
    push (@Apache::lonxml::namespace,'imageresponse');
    my $id = &Apache::response::start_response($parstack,$safeeval);
    return '';
}

# ========================================================== End image response
sub end_imageresponse {
    &Apache::response::end_response;
    pop @Apache::lonxml::namespace;
    return '';
}

%Apache::response::foilgroup = {};
# ============================================================ Start foil group
sub start_foilgroup {
    %Apache::response::foilgroup = {};
    $Apache::imageresponse::conceptgroup = 0;
    &Apache::response::setrandomnumber();
    return '';
}

# =================================== Get foil counts (returns 2 element array)
sub getfoilcounts {
    my ($parstack,$safeeval) = @_;
    my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,'-2');
    # +1 since instructors will count from 1
    my $count = $#{ $Apache::response::foilgroup{'names'} }+1;
    return ($count,$max);
}

# ============================================== Which foils (returns an array)
sub whichfoils {
    my ($max) = @_;
    if (!defined(@{ $Apache::response::foilgroup{'names'} })) { return; }
    my @names = @{ $Apache::response::foilgroup{'names'} };
    my @whichopt =();
    while ((($#whichopt+1) < $max) && ($#names > -1)) {
	&Apache::lonxml::debug("Have $#whichopt max is $max");
	my $aopt = int(rand($#names+1));
	&Apache::lonxml::debug("From $#names elms, picking $aopt");
	$aopt = splice(@names,$aopt,1);
	&Apache::lonxml::debug("Picked $aopt");
	push (@whichopt,$aopt);
    }
    return @whichopt;
}

# ======================================= Display foils (returns scalar string)
sub displayfoils {
    my (@whichopt) = @_;
    my $result ='';
    my $name;
    my $temp = 1;
    foreach $name (@whichopt) {
	$result .= $Apache::response::foilgroup{"$name.text"}."<br />\n";
	my $image = $Apache::response::foilgroup{"$name.image"};
	if ($Apache::lonhomework::history{'resource.'.
					  $Apache::inputtags::part.
					  '.solved'} =~ /^correct/) {
	    $result .= "<img src=\"$image\"/> <br />\n";
	} else {
	    $result .= "<input type=\"image\" name=\"HWVAL_".
		       $Apache::inputtags::response['-1'].
		       ":$temp\" src=\"$image\"/> <br />\n";
	}
	$temp++;
    }
    return $result;
}

# ================================================================= Grade foils
sub gradefoils {
    my (@whichopt) = @_;
    my $result = '';
    my $x;
    my $y;
    my $result;
    my $id = $Apache::inputtags::response['-1'];
    my $temp = 1;
    foreach my $name (@whichopt) {
	$x = $ENV{"form.HWVAL_$id:$temp.x"};
	$y = $ENV{"form.HWVAL_$id:$temp.y"};
	&Apache::lonxml::debug("Got a x of $x and a y of $y for $name");
	if (defined(@{ $Apache::response::foilgroup{"$name.area"} })) {
	    my @areas = @{ $Apache::response::foilgroup{"$name.area"} };
	    my $grade = "INCORRECT";
	    foreach my $area (@areas) {
		&Apache::lonxml::debug("Area is $area for $name");
		$area =~ m/([a-z]*):/;
		&Apache::lonxml::debug("Area of type $1");
		if ($1 eq 'rectangle') {
		    $grade = &grade_rectangle($area,$x,$y);
		} else {
		    &Apache::lonxml::error("Unknown area style $area");
		}
		&Apache::lonxml::debug("Area said $grade");
		if ($grade eq 'APPROX_ANS') { last; }
	    }
	    &Apache::lonxml::debug("Foil was $grade");
	    if ($grade eq 'INCORRECT') { $result = 'INCORRECT'; }
	    if (($grade eq 'APPROX_ANS') && ($result ne 'APPROX_ANS')) {
		$result = $grade; }
	    &Apache::lonxml::debug("Question is $result");
	    $temp++;
	}
    }
    $Apache::lonhomework::results{'resource.'.
				  $Apache::inputtags::part.
				  ".$id.submission"} = "$x:$y";
    $Apache::lonhomework::results{'resource.'.
				  $Apache::inputtags::part.
				  ".$id.awarddetail"} = $result;
    return '';
}

# ======================================= End foil group (return scalar string)
sub end_foilgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    my $result = '';
    my @whichopt;
    if ($target eq 'web' || $target eq 'grade') {
	my ($count,$max) = &getfoilcounts($parstack,$safeeval);
	if ($count > $max) { $count = $max }
	&Apache::lonxml::debug("Count is $count from $max");
	@whichopt = &whichfoils($max);
    }
    if ($target eq 'web') {
	$result = &displayfoils(@whichopt);
    }
    if ($target eq 'grade') {
	if ( defined $ENV{'form.submitted'}) {
	    &gradefoils(@whichopt);
	}
    }
    return $result;
}

# ========================================================= Start concept group
sub start_conceptgroup {
    $Apache::imageresponse::conceptgroup = 1;
    %Apache::response::conceptgroup = {};
    return '';
}

# =========================================================== End concept group
sub end_conceptgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    $Apache::imageresponse::conceptgroup = 0;  
    if ($target eq 'web' || $target eq 'grade') {
	if (defined(@{ $Apache::response::conceptgroup{'names'} })) {
	    my @names = @{ $Apache::response::conceptgroup{'names'} };
	    my $pick = int(rand($#names+1));
	    my $name = $names[$pick];
	    if (defined(@{ $Apache::response::conceptgroup{"$name.area"} })) {
		push @{ $Apache::response::foilgroup{'names'} }, $name;
		$Apache::response::foilgroup{"$name.text"} =
                                 $Apache::response::conceptgroup{"$name.text"};
		$Apache::response::foilgroup{"$name.image"} =
		                $Apache::response::conceptgroup{"$name.image"};
		push(@{ $Apache::response::foilgroup{"$name.area"} },
		     @{ $Apache::response::conceptgroup{"$name.area"} });
		my $concept = &Apache::lonxml::get_param('concept',$parstack,
							 $safeeval);
		$Apache::response::foilgroup{"$name.concept"} = $concept;
		&Apache::lonxml::debug("Selecting $name in $concept");
	    }
	}
    }
    return '';
}

$Apache::imageresponse::curname = '';
# ================================================================== Start foil
sub start_foil {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    if ($target eq 'web' || $target eq 'grade') {
	my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
	if ($name eq '') { $name=$Apache::lonxml::curdepth; }
	if ( $Apache::imageresponse::conceptgroup ) {
	    push(@{ $Apache::response::conceptgroup{'names'} }, $name);
	} else {
	    push(@{ $Apache::response::foilgroup{'names'} }, $name);
	}
	$Apache::imageresponse::curname=$name;
    }
    return '';
}

# ==================================================================== End foil
sub end_foil {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    return '';
}

# ================================================================== Start text
sub start_text {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    if ($target eq 'web') { &Apache::lonxml::startredirection; }
    return '';
}

# ==================================================================== End text
sub end_text {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    if ($target eq 'web') {
	my $name = $Apache::imageresponse::curname;
	if ( $Apache::imageresponse::conceptgroup ) {
	    $Apache::response::conceptgroup{"$name.text"} = 
		                               &Apache::lonxml::endredirection;
	} else {
	    $Apache::response::foilgroup{"$name.text"} = 
		                               &Apache::lonxml::endredirection;
	}
    }
    return '';
}

# ================================================================= Start image
sub start_image {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    if ($target eq 'web') { &Apache::lonxml::startredirection; }
    return '';
}

# =================================================================== End image
sub end_image {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    if ($target eq 'web') {
	my $name = $Apache::imageresponse::curname;
	my $image = &Apache::lonxml::endredirection;
	&Apache::lonxml::debug("out is $image");
	if ( $Apache::imageresponse::conceptgroup ) {
	    $Apache::response::conceptgroup{"$name.image"} = $image;
	} else {
	    $Apache::response::foilgroup{"$name.image"} = $image;
	}
    }
    return '';
}

# ============================================================= Start rectangle
sub start_rectangle {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    if ($target eq 'web' || $target eq 'grade') { 
	&Apache::lonxml::startredirection;
    }
    return '';
}

# ====================================== Grade rectangle (return scalar string)
sub grade_rectangle {
    my ($spec,$x,$y) = @_;
    &Apache::lonxml::debug("Spec is $spec");
    $spec =~ m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/;
    my $x1 = $1;
    my $y1 = $2;
    my $x2 = $3;
    my $y2 = $4;
    &Apache::lonxml::debug("Point $x1,$y1,$x2,$y2");
    if ($x1 > $x2) { my $temp = $x1; $x1 = $x2; $x2 = $temp; }
    if ($y1 > $y2) { my $temp = $y1; $y1 = $y2; $y2 = $temp; }
    if ($x => $x1) { if ($x <= $x2) { if ($y => $y1) {
	if ($y <= $y2) { return 'APPROX_ANS'; } } } }
    return 'INCORRECT';
}

# =============================================================== End rectangle
sub end_rectangle {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
    if ($target eq 'web' || $target eq 'grade') {
	my $name = $Apache::imageresponse::curname;
	my $area = &Apache::lonxml::endredirection;
	&Apache::lonxml::debug("out is $area for $name");
	if ( $Apache::imageresponse::conceptgroup ) {
	    push @{ $Apache::response::conceptgroup{"$name.area"} },
 	         "rectangle:$area";
	} else {
	    push @{ $Apache::response::foilgroup{"$name.area"} },
	         "rectangle:$area";
	}
    }
    return '';
}

1;

__END__