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package SVG::Graph::Glyph::bar;
use base SVG::Graph::Glyph;
use strict;
use Data::Dumper;
our @lifts;
=head2 draw
Title : draw
Usage :
Function:
Example :
Returns :
Args :
=cut
sub draw{
my ($self,@args) = @_;
my($x1,$x2,$y1,$y2) = (undef,undef,undef,undef);
#this will be the width of a bar, we need to calculate the
#minimum distance between any two values in the data,
#and use that as the step size.
my $step = undef;
my %xcoords = map {$_->x => 1} $self->group->data;
($x1,$x2) = (undef,undef);
foreach my $xcoord (sort {$a <=> $b} keys %xcoords){
$x1 = $xcoord and next unless defined($x1);
$x2 = $xcoord;
if(!defined($step)){
$step = $x2 - $x1;
} else {
$step = $x2 - $x1 < $step ? $x2 - $x1 : $step;
}
$x1 = $x2;
}
if($self->group->stack){
foreach my $data ($self->group->data_chunks){
my @newlifts = $self->_bars($step,\@lifts,[$data->data]);
my $i = 0;
foreach my $newlift (@newlifts){
$lifts[$i] += $newlift;
$i++;
}
}
} else {
$self->_bars($step,\@lifts,[$self->group->data]);
}
}
sub _bars {
my $self = shift;
my($step,$lifts,$data) = @_;
my @ls = ();
my $l;
#FIXME this logic is fubar, but it keeps things in proper scale.
my $yscale;
if($self->group->stack){
$yscale = $self->ysize / ($self->group->_parent_group->ymax);
} else {
$yscale = $self->yscale;
}
#AD: umm... why?
#xscale is ++'d for fencepost error
my $w = ($self->xsize - ($step * ($self->xscale))) / ($self->group->xrange); #+1
my $lift;
my ($x1,$x2,$y1,$y2) = (
(($self->group->xmin - $self->group->xmin) * ($self->xscale)) + $self->xoffset, #+1
undef,
($self->ysize - ($self->group->ymin - $self->group->ymin) * $yscale) + $self->yoffset,
undef,
);
foreach my $datum (sort {$a->x <=> $b->x} @$data){
$lift = shift @$lifts;
push @ls, ($self->ysize - $y1 + $self->yoffset) + $lift;
if(!defined($x1) and !defined($y1)){
$x1 = (($datum->x - $self->group->xmin) * $w) + $self->xoffset;
$y1 = ($self->ysize - ($datum->y - $self->group->ymin) * $yscale) + $self->yoffset;
next;
}
$x2 = (($datum->x - $self->group->xmin) * $w) + $self->xoffset;
$y2 = ($self->ysize - ($datum->y - $self->group->ymin) * $yscale) + $self->yoffset;
$self->canvas->rectangle(
x=>$x1,
y=>$y1 - $lift,
width => $w,
height=>$self->ysize - $y1 + $self->yoffset,
style=>{$self->_style}
);
$x1 = $x2;
$y1 = $y2;
}
$lift = shift @$lifts;
push @ls, ($self->ysize - $y1 + $self->yoffset) + $lift;
#plot the last data bar
$self->canvas->rectangle(
x=>$x1,
y=>$y1 - $lift,
width=>$w,
height=>$self->ysize - $y1 + $self->yoffset,
style=>{$self->_style}
);
return @ls;
}
1;
|
