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package Chart::Clicker::Renderer::Line;
$Chart::Clicker::Renderer::Line::VERSION = '2.90';
use Moose;
# ABSTRACT: Line renderer
extends 'Chart::Clicker::Renderer';
use Geometry::Primitive::Point;
use Graphics::Primitive::Brush;
use Graphics::Primitive::Operation::Stroke;
use Geometry::Primitive::Circle;
#number of defined points we must have around another point
#to render a line instead of a scatter
#
use constant MIN_DEFINED_SURROUNDING_POINTS => 5;
has 'brush' => (
is => 'rw',
isa => 'Graphics::Primitive::Brush',
default => sub { Graphics::Primitive::Brush->new(width => 2) }
);
has 'shape' => (
is => 'rw',
isa => 'Geometry::Primitive::Shape',
);
has 'shape_brush' => (
is => 'rw',
isa => 'Graphics::Primitive::Brush',
);
# TODO Readd shapes
sub finalize {
my ($self) = @_;
my $width = $self->width;
my $height = $self->height;
my $clicker = $self->clicker;
my $dses = $clicker->get_datasets_for_context($self->context);
my %accum;
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 $color = $clicker->color_allocator->next;
my @vals = @{ $series->values };
my @keys = @{ $series->keys };
my $kcount = $series->key_count - 1;
my $skip = 0;
my $previous_x = -1;
my $previous_y = -1;
my $min_y_delta_on_same_x = $height / 100;
for(0..$kcount) {
my $key = $keys[$_];
my $x = $domain->mark($width, $key);
next unless defined($x);
$skip = 1 unless defined $vals[$_];
my $ymark = $range->mark($height, $vals[$_]);
next unless defined($ymark);
if($self->additive) {
if(exists($accum{$key})) {
$accum{$key} += $ymark;
$ymark = $accum{$key};
} else {
$accum{$key} = $ymark;
}
}
my $y = $height - $ymark;
if( $_ == 0 || $skip ) {
my $lineop = Graphics::Primitive::Operation::Stroke->new(
brush => $self->brush->clone
);
$lineop->brush->color($color);
$self->do($lineop);
$self->move_to($x, $y);
my $start_new_line = 1;
foreach my $i ($_..($_ + MIN_DEFINED_SURROUNDING_POINTS)) {
if ($i > 0 && $i < @vals && !defined($vals[$i])) {
$start_new_line = 0;
}
}
if ($start_new_line){
$skip = 0;
}
else {
my $shape = Geometry::Primitive::Circle->new(radius => 3);
$shape->origin(Geometry::Primitive::Point->new(x => $x, y => $y));
$self->path->add_primitive($shape);
my $fill = Graphics::Primitive::Operation::Fill->new(
paint => Graphics::Primitive::Paint::Solid->new(
color => $color
)
);
$self->do($fill);
}
}
else {
# when in fast mode, we plot only if we moved by more than
# 1 of a pixel on the X axis or we moved by more than 1%
# of the size of the Y axis.
if( $clicker->plot_mode ne 'fast' ||
$x - $previous_x > 1 ||
abs($y - $previous_y) > $min_y_delta_on_same_x
)
{
$self->line_to($x, $y);
$previous_x = $x;
$previous_y = $y;
}
}
}
my $op = Graphics::Primitive::Operation::Stroke->new;
$op->brush($self->brush->clone);
$op->brush->color($color);
$self->do($op);
if(defined($self->shape)) {
for(0..$kcount) {
my $key = $keys[$_];
my $x = $domain->mark($width, $key);
next unless defined($x);
my $ymark = $range->mark($height, $vals[$_]);
next unless defined($ymark);
if($self->additive) {
if(exists($accum{$key})) {
$ymark = $accum{$key};
} else {
$accum{$key} = $ymark;
}
}
my $y = $height - $ymark;
$self->move_to($x, $y);
$self->draw_point($x, $y, $series, $vals[$_]);
}
# Fill the shape
my $op2 = Graphics::Primitive::Operation::Fill->new(
paint => Graphics::Primitive::Paint::Solid->new(
color => $color
)
);
if(defined($self->shape_brush)) {
$op2->preserve(1);
}
$self->do($op2);
# Optionally stroke the shape
if(defined($self->shape_brush)) {
my $op3 = Graphics::Primitive::Operation::Stroke->new;
$op3->brush($self->shape_brush->clone);
$self->do($op3);
}
}
}
}
return 1;
}
sub draw_point {
my ($self, $x, $y, $series, $count) = @_;
my $shape = $self->shape->clone;
$shape->origin(Geometry::Primitive::Point->new(x => $x, y => $y));
$self->path->add_primitive($shape);
}
__PACKAGE__->meta->make_immutable;
no Moose;
1;
__END__
=pod
=head1 NAME
Chart::Clicker::Renderer::Line - Line renderer
=head1 VERSION
version 2.90
=head1 SYNOPSIS
my $lr = Chart::Clicker::Renderer::Line->new(
brush => Graphics::Primitive::Brush->new({
#...
})
);
=head1 DESCRIPTION
Chart::Clicker::Renderer::Line renders a dataset as lines.
=for HTML <p><img src="http://gphat.github.com/chart-clicker/static/images/examples/line.png" width="500" height="250" alt="Line Chart" /></p>
=for HTML <p><img src="http://gphat.github.com/chart-clicker/static/images/examples/line-shapes.png" width="500" height="250" alt="Line + Shape Chart" /></p>
=for HTML <p><img src="http://gphat.github.com/chart-clicker/static/images/examples/line-shapes-brushed.png" width="500" height="250" alt="Line + Shape (Brushed) Chart" /></p>
=head1 ATTRIBUTES
=head2 additive
If true, the lines are drawn "stacked", each key accumulates based on those
drawn below it.
=head2 brush
Set/Get a L<brush|Graphics::Primitive::Brush> to be used for the lines.
=head2 shape
Set a L<shape|Geometry::Primitive::Shape> object to draw at each of the data points. Adding a shape results
in:
=head2 shape_brush
Set/Get the L<brush|Graphics::Primitive::Brush> to be used on the shapes at
each point. If no shape_brush is provided, then the shapes will be filled.
The brush allows you to draw a "halo" around each shape. This sometimes help
to separate the points from the lines and make them more distinct.
=head1 METHODS
=head2 draw_point
Called for each point encountered on the line.
=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
|
