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#==========================================================================
# Copyright (c) 1995-1998 Martien Verbruggen
#--------------------------------------------------------------------------
#
# Name:
# GIFgraph::bars.pm
#
# $Id: bars.pm,v 2.5 1998/08/25 04:22:15 mgjv Exp $
#
#==========================================================================
package GIFgraph::bars;
use strict qw(vars refs subs);
use GIFgraph::axestype;
use GIFgraph::utils qw(:all);
@GIFgraph::bars::ISA = qw( GIFgraph::axestype );
my %Defaults = (
# Spacing between the bars
bar_spacing => 0,
);
{
sub initialise()
{
my $self = shift;
$self->SUPER::initialise();
my $key;
foreach $key (keys %Defaults)
{
$self->set( $key => $Defaults{$key} );
}
}
# PRIVATE
sub draw_data{
my $s = shift;
my $g = shift;
my $d = shift;
if ( $s->{overwrite} )
{
$s->draw_data_overwrite($g, $d);
}
else
{
$s->SUPER::draw_data($g, $d);
}
# redraw the 'zero' axis
$g->line(
$s->{left}, $s->{zeropoint},
$s->{right}, $s->{zeropoint},
$s->{fgci} );
}
# Draws the bars on top of each other
sub draw_data_overwrite {
my $s = shift;
my $g = shift;
my $d = shift;
my $bar_s = _round($s->{bar_spacing}/2);
my $zero = $s->{zeropoint};
my $i;
for $i (0 .. $s->{numpoints})
{
my $bottom = $zero;
my ($xp, $t);
my $j;
for $j (1 .. $s->{numsets})
{
next unless (defined $d->[$j][$i]);
# get data colour
my $dsci = $s->set_clr( $g, $s->pick_data_clr($j) );
# get coordinates of top and center of bar
($xp, $t) = $s->val_to_pixel($i + 1, $d->[$j][$i], $j);
# calculate left and right of bar
my $l = $xp - _round($s->{x_step}/2) + $bar_s;
my $r = $xp + _round($s->{x_step}/2) - $bar_s;
# calculate new top
$t -= ($zero - $bottom) if ($s->{overwrite} == 2);
# draw the bar
if ($d->[$j][$i] >= 0)
{
# positive value
$g->filledRectangle( $l, $t, $r, $bottom, $dsci );
$g->rectangle( $l, $t, $r, $bottom, $s->{acci} );
}
else
{
# negative value
$g->filledRectangle( $l, $bottom, $r, $t, $dsci );
$g->rectangle( $l, $bottom, $r, $t, $s->{acci} );
}
# reset $bottom to the top
$bottom = $t if ($s->{overwrite} == 2);
}
}
}
sub draw_data_set($$$)
{
my $s = shift;
my $g = shift;
my $d = shift;
my $ds = shift;
my $bar_s = _round($s->{bar_spacing}/2);
# Pick a data colour
my $dsci = $s->set_clr( $g, $s->pick_data_clr($ds) );
my $i;
for $i (0 .. $s->{numpoints})
{
next unless (defined $d->[$i]);
# get coordinates of top and center of bar
my ($xp, $t) = $s->val_to_pixel($i + 1, $d->[$i], $ds);
# calculate left and right of bar
my ($l, $r);
if ($s->{mixed})
{
$l = $xp - _round($s->{x_step}/2) + $bar_s;
$r = $xp + _round($s->{x_step}/2) - $bar_s;
}
else
{
$l = $xp
- _round($s->{x_step}/2)
+ _round(($ds - 1) * $s->{x_step}/$s->{numsets})
+ $bar_s;
$r = $xp
- _round($s->{x_step}/2)
+ _round($ds * $s->{x_step}/$s->{numsets})
- $bar_s;
}
# draw the bar
if ($d->[$i] >= 0)
{
# positive value
$g->filledRectangle( $l, $t, $r, $s->{zeropoint}, $dsci );
$g->rectangle( $l, $t, $r, $s->{zeropoint}, $s->{acci} );
}
else
{
# negative value
$g->filledRectangle( $l, $s->{zeropoint}, $r, $t, $dsci );
$g->rectangle( $l, $s->{zeropoint}, $r, $t, $s->{acci} );
}
}
}
} # End of package GIFgraph::bars
1;
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