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#====================================================================
# Chart::Points
#
# written by david bonner
# dbonner@cs.bu.edu
#
# maintained by the Chart Group
# Chart@wettzell.ifag.de
#
#---------------------------------------------------------------------
# History:
#----------
# $RCSfile: Points.pm,v $ $Revision: 1.4 $ $Date: 2003/02/14 14:22:05 $
# $Author: dassing $
# $Log: Points.pm,v $
# Revision 1.4 2003/02/14 14:22:05 dassing
# First setup to cvs
#
#====================================================================
package Chart::Points;
use Chart::Base 2.0;
use GD;
use Carp;
use strict;
@Chart::Points::ISA = qw(Chart::Base);
$Chart::Points::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, $mod);
my ($width, $height, $delta, $map, $delta_num, $zero_offset);
my ($i, $j, $color, $brush);
my $diff;
# init the imagemap data field if they want it
if ($self->{'imagemap'} =~ /^true$/i) {
$self->{'imagemap_data'} = [];
}
# find the delta value between data points, as well
# as the mapping constant
$width = $self->{'curr_x_max'} - $self->{'curr_x_min'};
$height = $self->{'curr_y_max'} - $self->{'curr_y_min'};
$delta = $width / ( $self->{'num_datapoints'} > 0 ? $self->{'num_datapoints'} : 1);
$diff = ($self->{'max_val'} - $self->{'min_val'});
$diff = 1 if $diff == 0;
$map = $height / $diff;
#for a xy-plot, use this delta and maybe an offset for the zero-axes
if ($self->{'xy_plot'} =~ /^true$/i ) {
$diff = ($self->{'x_max_val'} - $self->{'x_min_val'});
$diff = 1 if $diff == 0;
$delta_num = $width / $diff;
if ($self->{'x_min_val'} <= 0 && $self->{'x_max_val'} >= 0) {
$zero_offset = abs($self->{'x_min_val'}) * abs($delta_num);
}
elsif ($self->{'x_min_val'} > 0 || $self->{'x_max_val'} < 0) {
$zero_offset = -$self->{'x_min_val'} * $delta_num;
}
else {
$zero_offset = 0;
}
}
# get the base x-y values
if ($self->{'xy_plot'} =~ /^false$/i ) {
$x1 = $self->{'curr_x_min'} + ($delta / 2);
}
else {
$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 points
for $i (1..$self->{'num_datasets'}) {
# get the color for this dataset, and set the brush
$color = $self->_color_role_to_index('dataset'.($i-1));
$brush = $self->_prepare_brush ($color);
$self->{'gd_obj'}->setBrush ($brush);
# draw every point for this dataset
for $j (0..$self->{'num_datapoints'}) {
# don't try to draw anything if there's no data
if (defined ($data->[$i][$j])) {
if ($self->{'xy_plot'} =~ /^true$/i ) {
$x2 = $x1 + $delta_num * $data->[0][$j] + $zero_offset;
$x3 = $x2 ;
}
else {
$x2 = $x1 + ($delta * $j);
$x3 = $x2;
}
$y2 = $y1 - (($data->[$i][$j] - $mod) * $map);
$y3 = $y2;
# draw the point only if it is within the chart borders
if ($data->[$i][$j] <= $self->{'max_val'} && $data->[$i][$j] >= $self->{'min_val'}) {
$self->{'gd_obj'}->line($x2, $y2, $x3, $y3, gdBrushed);
}
# store the imagemap data if they asked for it
if ($self->{'imagemap'} =~ /^true$/i) {
$self->{'imagemap_data'}->[$i][$j] = [ $x2, $y2 ];
}
}
}
}
# 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;
}
## set the gdBrush object to have nice circular points
sub _prepare_brush {
my $self = shift;
my $color = shift;
my $radius = $self->{'pt_size'}/2;
my (@rgb, $brush, $white, $newcolor);
# get the rgb values for the desired color
@rgb = $self->{'gd_obj'}->rgb($color);
# create the new image
$brush = GD::Image->new ($radius*2, $radius*2);
# get the colors, make the background transparent
$white = $brush->colorAllocate (255,255,255);
$newcolor = $brush->colorAllocate (@rgb);
$brush->transparent ($white);
# draw the circle
$brush->arc ($radius-1, $radius-1, $radius, $radius, 0, 360, $newcolor);
# and fill it
$brush->fill ($radius-1, $radius-1, $newcolor);
# set the new image as the main object's brush
return $brush;
}
## be a good module and return 1
1;
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