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#====================================================================
# Chart::Bars
#
# written by david bonner
# dbonner@cs.bu.edu
#
# maintained by the Chart Group
# Chart@wettzell.ifag.de
#
#---------------------------------------------------------------------
# History:
#----------
# $RCSfile: Bars.pm,v $ $Revision: 1.4 $ $Date: 2003/02/14 13:10:05 $
# $Author: dassing $
# $Log: Bars.pm,v $
# Revision 1.4 2003/02/14 13:10:05 dassing
# Circumvent division of zeros
#
#====================================================================
package Chart::Bars;
use Chart::Base 2.0;
use GD;
use Carp;
use strict;
@Chart::Bars::ISA = qw(Chart::Base);
$Chart::Bars::VERSION = '2.2';
#>>>>>>>>>>>>>>>>>>>>>>>>>>#
# public methods go here #
#<<<<<<<<<<<<<<<<<<<<<<<<<<#
#>>>>>>>>>>>>>>>>>>>>>>>>>>>#
# private methods go here #
#<<<<<<<<<<<<<<<<<<<<<<<<<<<#
## finally get around to plotting the data
sub _draw_data {
my $self = shift;
my $data = $self->{'dataref'};
my $misccolor = $self->_color_role_to_index('misc');
my ($x1, $x2, $x3, $y1, $y2, $y3);
my ($width, $height, $delta1, $delta2, $map, $mod, $cut, $pink);
my ($i, $j, $color);
# init the imagemap data field if they wanted it
if ($self->{'imagemap'} =~ /^true$/i) {
$self->{'imagemap_data'} = [];
}
# find both delta values ($delta1 for stepping between different
# datapoint names, $delta2 for stepping between datasets for that
# point) and the mapping constant
$width = $self->{'curr_x_max'} - $self->{'curr_x_min'};
$height = $self->{'curr_y_max'} - $self->{'curr_y_min'};
$delta1 = ( $self->{'num_datapoints'} > 0 ) ? $width / $self->{'num_datapoints'} : $width;
$map = ( ($self->{'max_val'} - $self->{'min_val'}) > 0 ) ? $height / ($self->{'max_val'} - $self->{'min_val'}) : $height;
if ($self->{'spaced_bars'} =~ /^true$/i) {
#OLD: $delta2 = $delta1 / ($self->{'num_datasets'} + 2);
$delta2 = ( ($self->{'num_datasets'} + 2) > 0 ) ? $delta1 / ($self->{'num_datasets'} + 2) : $delta1;
}
else {
$delta2 = ( $self->{'num_datasets'} > 0 ) ? $delta1 / $self->{'num_datasets'} : $delta1;
}
# get the base x-y values
$x1 = $self->{'curr_x_min'};
if ($self->{'min_val'} >= 0) {
$y1 = $self->{'curr_y_max'};
$mod = $self->{'min_val'};
}
elsif ($self->{'max_val'} <= 0) {
$y1 = $self->{'curr_y_min'};
$mod = $self->{'max_val'};
}
else {
$y1 = $self->{'curr_y_min'} + ($map * $self->{'max_val'});
$mod = 0;
$self->{'gd_obj'}->line ($self->{'curr_x_min'}, $y1,
$self->{'curr_x_max'}, $y1,
$misccolor);
}
# draw the bars
for $i (1..$self->{'num_datasets'}) {
# get the color for this dataset
$color = $self->_color_role_to_index('dataset'.($i-1));
# draw every bar for this dataset
for $j (0..$self->{'num_datapoints'}) {
# don't try to draw anything if there's no data
if (defined ($data->[$i][$j])) {
# find the bounds of the rectangle
if ($self->{'spaced_bars'} =~ /^true$/i) {
$x2 = $x1 + ($j * $delta1) + ($i * $delta2);
}
else {
$x2 = $x1 + ($j * $delta1) + (($i - 1) * $delta2);
}
$y2 = $y1;
$x3 = $x2 + $delta2;
$y3 = $y1 - (($data->[$i][$j] - $mod) * $map);
#cut the bars off, if needed
if ($data->[$i][$j] > $self->{'max_val'}) {
$y3 = $y1 - (($self->{'max_val'} - $mod ) * $map) ;
$cut = 1;
}
elsif ($data->[$i][$j] < $self->{'min_val'}) {
$y3 = $y1 - (($self->{'min_val'} - $mod ) * $map) ;
$cut = 1;
}
else {
#$y3 = $y1 + (($data->[$i][$j] - $mod) * $map);
$cut = 0;
}
# draw the bar
## y2 and y3 are reversed in some cases because GD's fill
## algorithm is lame
if ($data->[$i][$j] > 0) {
$self->{'gd_obj'}->filledRectangle ($x2, $y3, $x3, $y2, $color);
if ($self->{'imagemap'} =~ /^true$/i) {
$self->{'imagemap_data'}->[$i][$j] = [$x2, $y3, $x3, $y2];
}
}
else {
$self->{'gd_obj'}->filledRectangle ($x2, $y2, $x3, $y3, $color);
if ($self->{'imagemap'} =~ /^true$/i) {
$self->{'imagemap_data'}->[$i][$j] = [$x2, $y2, $x3, $y3];
}
}
# now outline it. outline red if the bar had been cut off
unless ($cut){
$self->{'gd_obj'}->rectangle ($x2, $y3, $x3, $y2, $misccolor);
}
else {
$pink = $self->{'gd_obj'}->colorAllocate(255,0,255);
$self->{'gd_obj'}->rectangle ($x2, $y3, $x3, $y2, $pink);
}
} else {
if ($self->{'imagemap'} =~ /^true$/i) {
$self->{'imagemap_data'}->[$i][$j] = [undef(), undef(), undef(), undef()];
}
}
}
}
# and finaly box it off
$self->{'gd_obj'}->rectangle ($self->{'curr_x_min'},
$self->{'curr_y_min'},
$self->{'curr_x_max'},
$self->{'curr_y_max'},
$misccolor);
return;
}
## be a good module and return 1
1;
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