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package Imager::Graph; |
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require 5.006; |
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=head1 NAME |
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Imager::Graph - Perl extension for producing Graphs using the Imager library. |
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=head1 SYNOPSIS |
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use Imager::Graph::Sub_class; |
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my $chart = Imager::Graph::Sub_class->new; |
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my $img = $chart->draw(data=> \@data, ...) |
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or die $chart->error; |
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$img->write(file => 'image.png'); |
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=head1 DESCRIPTION |
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Imager::Graph provides style information to its base classes. It |
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defines the colors, text display information and fills based on both |
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built-in styles and modifications supplied by the user to the draw() |
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method. |
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=over |
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=cut |
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use strict; |
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use vars qw($VERSION); |
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use Imager qw(:handy); |
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790899
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use Imager::Fountain; |
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$VERSION = '0.12'; |
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# the maximum recursion depth in determining a color, fill or number |
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use constant MAX_DEPTH => 10; |
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my $NUM_RE = '(?:[+-]?(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]\d+?)?)'; |
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=item new |
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This is a simple constructor. No parameters required. |
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=cut |
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sub new { |
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bless {}, $_[0]; |
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} |
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=item set_graph_size($size) |
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Sets the size of the graph (in pixels) within the image. The size of the image defaults to 1.5 * $graph_size. |
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=cut |
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sub set_graph_size { |
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$_[0]->{'custom_style'}->{'size'} = $_[1]; |
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} |
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=item set_image_width($width) |
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Sets the width of the image in pixels. |
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=cut |
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sub set_image_width { |
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$_[0]->{'custom_style'}->{'width'} = $_[1]; |
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} |
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=item set_image_height($height) |
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Sets the height of the image in pixels. |
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=cut |
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sub set_image_height { |
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$_[0]->{'custom_style'}->{'height'} = $_[1]; |
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} |
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=item add_data_series([8, 6, 7, 5, 3, 0, 9], 'Series Name'); |
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Adds a data series to the graph. For L, only one data series can be added. |
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=cut |
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sub add_data_series { |
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my $self = shift; |
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my $data_ref = shift; |
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my $series_name = shift; |
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my $graph_data = $self->{'graph_data'} || []; |
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push @$graph_data, { data => $data_ref, series_name => $series_name }; |
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if (defined $series_name) { |
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push @{$self->{'labels'}}, $series_name; |
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} |
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$self->{'graph_data'} = $graph_data; |
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return; |
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} |
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sub _get_data_series { |
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my ($self, $opts) = @_; |
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# return the data supplied to draw() if any. |
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if ($opts->{data}) { |
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# one or multiple series? |
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my $data = $opts->{data}; |
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if (@$data && ref $data->[0] && ref $data->[0] =~ /ARRAY/) { |
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return $data; |
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} |
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else { |
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return [ { data => $data } ]; |
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} |
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} |
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return $self->{'graph_data'}; |
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} |
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=item set_labels(['label1', 'label2' ... ]) |
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Labels the specific data points. For line/bar graphs, this is the x-axis. For pie graphs, it is the label for the wedges. |
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=cut |
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sub set_labels { |
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$_[0]->{'labels'} = $_[1]; |
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} |
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sub _get_labels { |
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my ($self, $opts) = @_; |
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$opts->{labels} |
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and return $opts->{labels}; |
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return $_[0]->{'labels'} |
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} |
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=item set_title($title) |
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Sets the title of the graph. Requires setting a font. |
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=cut |
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sub set_title { |
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$_[0]->{'custom_style'}->{'title'}->{'text'} = $_[1]; |
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} |
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=item set_font($font) |
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Sets the font to use for text. Takes an L object. |
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=cut |
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sub set_font { |
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$_[0]->{'custom_style'}->{'font'} = $_[1]; |
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} |
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=item set_style($style_name) |
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Sets the style to be used for the graph. Imager::Graph comes with several pre-defined styles: fount_lin (default), fount_rad, mono, primary_red, and primary. |
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=cut |
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164
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sub set_style { |
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$_[0]->{'style'} = $_[1]; |
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} |
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168
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sub _get_style { |
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my ($self, $opts) = @_; |
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$opts->{style} |
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and return $opts->{style}; |
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return $self->{'style'}; |
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} |
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=item error |
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Returns an error message. Only valid if the draw() method returns false. |
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181
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=cut |
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183
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sub error { |
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$_[0]->{_errstr}; |
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} |
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187
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=item draw |
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Creates a new image, draws the chart onto that image and returns it. |
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191
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Optionally, instead of using the api methods to configure your chart, |
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you can supply a C parameter in the format |
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required by that particular graph, and if your graph will use any |
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text, a C parameter |
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196
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You can also supply many different parameters which control the way |
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the graph looks. These are supplied as keyword, value pairs, where |
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the value can be a hashref containing sub values. |
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200
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The C |