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#>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>#
# Chart::LinesPoints #
# #
# written by david bonner #
# dbonner@cs.bu.edu #
# #
# maintained by Chart group #
# Chart@wettzell.ifag.de #
# #
# theft is treason, citizen #
#<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<#
package Chart::LinesPoints;
use Chart::Base;
use GD;
use Carp;
use strict;
@Chart::LinesPoints::ISA = qw(Chart::Base);
$Chart::LinesPoints::VERSION = 1.00;
my $DEBUG = 0;
#>>>>>>>>>>>>>>>>>>>>>>>>>>#
# 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, $map);
my ($i, $j, $color, $brush);
# init the imagemap data field if they want it
if ($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'};
$map = $height / ($self->{'max_val'} - $self->{'min_val'});
# get the base x-y values
$x1 = $self->{'curr_x_min'} + ($delta / 2);
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,
$misccolor);
}
# draw the lines
printf "Limit: y_max: %7.2f, y_min: %7.2f\n",$self->{'curr_y_max'},$self->{'curr_y_min'} if $DEBUG;
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, 'line');
$self->{'gd_obj'}->setBrush ($brush);
# draw every line for this dataset
for $j (1..$self->{'num_datapoints'}) {
# don't try to draw anything if there's no data
if (defined ($data->[$i][$j]) and defined ($data->[$i][$j-1])) {
$x2 = $x1 + ($delta * ($j - 1));
$x3 = $x1 + ($delta * $j);
$y2 = $y1 - (($data->[$i][$j-1] - $mod) * $map);
$y3 = $y1 - (($data->[$i][$j] - $mod) * $map);
# draw the line
printf "draw %7.2f,%7.2f --> %7.2f,%7.2f\n",$x2,$y2, $x3,$y3 if $DEBUG;
if ( $y2 < $self->{'curr_y_min'} && $y3 < $self->{'curr_y_min'} ||
$y2 > $self->{'curr_y_max'} && $y3 > $self->{'curr_y_max'} ) {
# the line starts and ends outside the frame
# do not draw any line
print "corrected: no draw\n" if $DEBUG;
next;
}
if ( $y2 < $self->{'curr_y_min'} && $y3 >= $self->{'curr_y_min'} && $y3 <= $self->{'curr_y_max'}) {
# the line starts outside y top line and ends inside the frame
my $y4 = $self->{'curr_y_min'};
my $deltax32 = $x3-$x2;
my $deltay23 = $y2-$y3;
if ( $deltay23 != 0 ) {
my $x4 = -$deltax32/$deltay23*($y4-$y3)+$x3;
$x2 = $x4;
$y2 = $y4;
}
printf "corrected draw %7.2f,%7.2f --> %7.2f,%7.2f\n",$x2,$y2, $x3,$y3 if $DEBUG;
}
elsif ( $y3 < $self->{'curr_y_min'} && $y2 <= $self->{'curr_y_max'} && $y2 >= $self->{'curr_y_min'} ) {
# the line starts inside the frame and ends outside the top y line
my $y4 = $self->{'curr_y_min'};
my $deltax32 = $x3-$x2;
my $deltay32 = $y3-$y2;
if ( $deltay32 != 0 ) {
my $x4 = ($y4-$y2)/$deltay32*$deltax32+$x2;
$x3 = $x4;
$y3 = $y4;
}
printf "corrected draw %7.2f,%7.2f --> %7.2f,%7.2f\n",$x2,$y2, $x3,$y3 if $DEBUG;
}
elsif ( $y2 <= $self->{'curr_y_max'} && $y2 >= $self->{'curr_y_min'} && $y3 > $self->{'curr_y_max'} ) {
# the line starts inside the frame and below the bottom y line
my $y4 = $self->{'curr_y_max'};
my $x4 = ($x2-$x3)/$y3*$y2+$x3;
$x3 = $x4;
$y3 = $y4;
printf "corrected draw %7.2f,%7.2f --> %7.2f,%7.2f\n",$x2,$y2, $x3,$y3 if $DEBUG;
}
elsif ( $y2 > $self->{'curr_y_max'} && $y3 <= $self->{'curr_y_max'} && $y3 >= $self->{'curr_y_min'} ) {
# the line starts below the bottom y line and ends inside the frame
my $y4 = $self->{'curr_y_max'};
my $x4 = ($x2-$x3)/$y2*$y3+$x3;
$x2 = $x4;
$y2 = $y4;
printf "corrected draw %7.2f,%7.2f --> %7.2f,%7.2f\n",$x2,$y2, $x3,$y3 if $DEBUG;
}
elsif ( $y2 > $self->{'curr_y_max'} && $y3 < $self->{'curr_y_min'} ) {
# the line starts below the bottom y line and ends outside the top y line
my $y4 = $self->{'curr_y_max'};
my $y5 = $self->{'curr_y_min'};
my $x4 = ($y4-$y2)/($y3-$y2)*($x3-$x2)+$x2; # (x4,y4) --> (x2,y2)
my $x5 = ($y5-$y2)/($y3-$y2)*($x3-$x2)+$x2; # (x5,y5) --> (x3,y3)
$x2 = $x4;
$y2 = $y4;
$x3 = $x5;
$y3 = $y5;
printf "corrected draw %7.2f,%7.2f --> %7.2f,%7.2f\n",$x2,$y2, $x3,$y3 if $DEBUG;
}
elsif ( $y2 < $self->{'curr_y_min'} && $y3 > $self->{'curr_y_max'} ) {
# the line starts outside the top y line and ends below the bottom y line
my $y4 = $self->{'curr_y_min'};
my $y5 = $self->{'curr_y_max'};
my $x4 = ($y4-$y2)/($y3-$y2)*($x3-$x2)+$x2; # (x4,y4) --> (x2,y2)
my $x5 = ($y5-$y2)/($y3-$y2)*($x3-$x2)+$x2; # (x5,y5) --> (x3,y3)
$x2 = $x4;
$y2 = $y4;
$x3 = $x5;
$y3 = $y5;
printf "corrected draw %7.2f,%7.2f --> %7.2f,%7.2f\n",$x2,$y2, $x3,$y3 if $DEBUG;
}
$self->{'gd_obj'}->line($x2, $y2, $x3, $y3, gdBrushed);
}
}
# reset the brush for points
$brush = $self->_prepare_brush ($color, 'point');
$self->{'gd_obj'}->setBrush ($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])) {
$x2 = $x1 + ($delta * $j);
$x3 = $x2;
$y2 = $y1 - (($data->[$i][$j] - $mod) * $map);
$y3 = $y2;
# draw the point
if ( $y2 >= $self->{'curr_y_min'} && $y2 <= $self->{'curr_y_max'} &&
$y3 >= $self->{'curr_y_min'} && $y3 <= $self->{'curr_y_max'} ) {
$self->{'gd_obj'}->line($x2, $y2, $x3, $y3, gdBrushed);
}
# remember the imagemap data if they wanted it
if ($self->{'imagemap'} =~ /^true$/i) {
$self->{'imagemap_data'}->[$i][$j] = [ $x2, $y2 ];
}
} else {
if ($self->{'imagemap'} =~ /^true$/i) {
$self->{'imagemap_data'}->[$i][$j] = [ 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;
}
## set the gdBrush object to trick GD into drawing fat lines
sub _prepare_brush {
my $self = shift;
my $color = shift;
my $type = shift;
my ($radius, @rgb, $brush, $white, $newcolor);
# get the rgb values for the desired color
@rgb = $self->{'gd_obj'}->rgb($color);
# get the appropriate brush size
if ($type eq 'line') {
$radius = $self->{'brush_size'}/2;
}
elsif ($type eq 'point') {
$radius = $self->{'pt_size'}/2;
}
# 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);
# fill it if we're using lines
$brush->fill ($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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