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|
package Chart::Clicker::Renderer::Area;
$Chart::Clicker::Renderer::Area::VERSION = '2.90';
use Moose;
extends 'Chart::Clicker::Renderer';
# ABSTRACT: Area renderer
use Graphics::Primitive::Brush;
use Graphics::Primitive::Path;
use Graphics::Primitive::Operation::Fill;
use Graphics::Primitive::Operation::Stroke;
use Graphics::Primitive::Paint::Gradient::Linear;
use Graphics::Primitive::Paint::Solid;
has 'brush' => (
is => 'rw',
isa => 'Graphics::Primitive::Brush',
default => sub { Graphics::Primitive::Brush->new }
);
has 'fade' => (
is => 'rw',
isa => 'Bool',
default => 0
);
has 'opacity' => (
is => 'rw',
isa => 'Num',
default => 0
);
override('finalize', sub {
my ($self) = @_;
my $height = $self->height;
my $width = $self->width;
my $clicker = $self->clicker;
my $dses = $clicker->get_datasets_for_context($self->context);
foreach my $ds (@{ $dses }) {
foreach my $series (@{ $ds->series }) {
# TODO if undef...
my $ctx = $clicker->get_context($ds->context);
my $domain = $ctx->domain_axis;
my $range = $ctx->range_axis;
my $lastx; # used for completing the path
my @vals = @{ $series->values };
my @keys = @{ $series->keys };
my $startx;
my $biggest;
for(0..($series->key_count - 1)) {
my $x = $domain->mark($width, $keys[$_]);
next unless defined($x);
my $ymark = $range->mark($height, $vals[$_]);
next unless defined($ymark);
my $y = $height - $ymark;
if(defined($biggest)) {
$biggest = $y if $y > $biggest;
} else {
$biggest = $y;
}
if($_ == 0) {
$startx = $x;
$self->move_to($x, $y);
} else {
$self->line_to($x, $y);
}
$lastx = $x;
}
my $color = $self->clicker->color_allocator->next;
my $op = Graphics::Primitive::Operation::Stroke->new;
$op->preserve(1);
$op->brush($self->brush->clone);
$op->brush->color($color);
$self->do($op);
$self->line_to($lastx, $height);
$self->line_to($startx, $height);
$self->close_path;
my $paint;
if($self->opacity) {
my $clone = $color->clone;
$clone->alpha($self->opacity);
$paint = Graphics::Primitive::Paint::Solid->new(
color => $clone
);
} elsif($self->fade) {
my $clone = $color->clone;
$clone->alpha($self->opacity);
$paint = Graphics::Primitive::Paint::Gradient::Linear->new(
line => Geometry::Primitive::Line->new(
start => Geometry::Primitive::Point->new(x => 0, y => 0),
end => Geometry::Primitive::Point->new(x => 1, y => $biggest),
),
style => 'linear'
);
$paint->add_stop(1.0, $color);
$paint->add_stop(0, $clone);
} else {
$paint = Graphics::Primitive::Paint::Solid->new(
color => $color->clone
);
}
my $fillop = Graphics::Primitive::Operation::Fill->new(
paint => $paint
);
$self->do($fillop);
}
}
return 1;
});
__PACKAGE__->meta->make_immutable;
no Moose;
1;
__END__
=pod
=head1 NAME
Chart::Clicker::Renderer::Area - Area renderer
=head1 VERSION
version 2.90
=head1 SYNOPSIS
my $ar = Chart::Clicker::Renderer::Area->new({
fade => 1,
brush => Graphics::Primitive::Brush->new({
width => 2
})
});
=head1 DESCRIPTION
Chart::Clicker::Renderer::Area renders a dataset as line-like polygons with
their interior areas filled.
=for HTML <p><img src="http://gphat.github.com/chart-clicker/static/images/examples/area.png" width="500" height="250" alt="Area Chart" /></p>
=head1 ATTRIBUTES
=head2 brush
Set/Get the L<brush|Graphics::Primitive::Brush> that informs the line surrounding the area renders
individual segments.
=head2 fade
Set/Get the fade flag, which turns on or off a gradient in the area renderer.
=head2 opacity
Set the alpha value for the renderer, which makes things more or less opaque.
=head1 AUTHOR
Cory G Watson <gphat@cpan.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2016 by Cory G Watson.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
|
