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Tk-ForDummies-Graph-1.10
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/ Tk::ForDummies::Graph::Pie

NAME

Tk::ForDummies::Graph::Pie - Extension of Canvas widget to create a pie chart.

DESCRIPTION

Tk::ForDummies::Graph::Pie is an extension of the Canvas widget. It is an easy way to build an interactive pie graph into your Perl Tk widget. The module is written entirely in Perl/Tk.

When the mouse cursor passes over a pieslice or its entry in the legend, the pieslice turn to a color (that you can change) and a balloon box display to help identify it.

You can use 3 methods to zoom (vertically, horizontally or both).

SYNOPSIS

#!/usr/bin/perl
use strict;
use warnings;
use Tk;
use Tk::ForDummies::Graph::Pie;
my $mw = new MainWindow( -title => 'Tk::ForDummies::Graph::Pie example', );

my $GraphDummies = $mw->Pie(
  -title      => 'CPAN mirrors around the World',
  -background => 'white',
  -linewidth  => 2,
)->pack(qw / -fill both -expand 1 /);

my @data = (
  [ 'Europe', 'Asia', 'Africa', 'Oceania', 'Americas' ],
  [ 97,       33,     3,        6,         61 ],
);

$GraphDummies->plot( \@data );

MainLoop();

STANDARD OPTIONS

-background -borderwidth -closeenough -confine -cursor -height -highlightbackground -highlightcolor -highlightthickness -insertbackground -insertborderwidth -insertofftime -insertontime -insertwidth -relief -scrollregion -selectbackground -selectborderwidth -selectforeground -takefocus -width -xscrollcommand -xscrollincrement -yscrollcommand -yscrollincrement

WIDGET-SPECIFIC OPTIONS

Many options allow you to configure your chart as you want. The default configuration is already OK, but you can change it.

Name: Title
Class: Title
Switch: -title

Title of your graph.

-title => "My pie graph title",

Default : undef

Name: Titleposition
Class: TitlePosition
Switch: -titleposition

Position of title : center, left or right

-titleposition => 'left',

Default : center

Name: Titlecolor
Class: TitleColor
Switch: -titlecolor

Title color of your graph.

-titlecolor => "red",

Default : black

Name: Titlefont
Class: TitleFont
Switch: -titlefont

Set the font for the title text. See also textfont option.

-titlefont => "Times 15 {normal}",

Default : {Times} 12 {bold}

Name: Titleheight
Class: TitleHeight
Switch: -titleheight

Height for title graph space.

-titleheight => 100,

Default : 40

Name: Linewidth
Class: LineWidth
Switch: -linewidth

Set width of all lines slice pie inthe chart.

-linewidth => 10,

Default : 1

Name: Colordata
Class: ColorData
Switch: -colordata

This controls the colors of the lines. This should be a reference to an array of color names.

-colordata => [ qw(green pink blue cyan) ],

Default :

[ 'red',     'green',   'blue',    'yellow',  'purple',  'cyan',
  '#996600', '#99A6CC', '#669933', '#929292', '#006600', '#FFE100',
  '#00A6FF', '#009060', '#B000E0', '#A08000', 'orange',  'brown',
  'black',   '#FFCCFF', '#99CCFF', '#FF00CC', '#FF8000', '#006090',
],

The default array contain 24 colors. If you have more than 24 samples, the next line will have the color of the first array case (red).

Name: Startangle
Class: StartAngle
Switch: -startangle

The angle at which the first data slice will be displayed, with 0 degrees being "3 o'clock".

-startangle => 90,

Default : 0

WIDGET METHODS

The Canvas method creates a widget object. This object supports the configure and cget methods described in Tk::options which can be used to enquire and modify the options described above.

clearchart

$PieGraphDummies->clearchart

This method allows you to clear the chart. The canvas will not be destroy. It's possible to redraw your last chart using the redraw method.

plot

$PieGraphDummies->plot(\@data, ?arg)

Use this method to create your pie graph.

  • \@data

    Fill an array of arrays with the legend values and the values of the datasets (\@data). Make sure that every array have the same size, otherwise Tk::ForDummies::Graph::Pie will complain and refuse to compile the graph.

    my @data = (
    [ '1st', '2nd', '3rd', '4th', '5th', '6th', '7th', '8th', '9th' ],
    [ 1,     2,     52,    6,     3,     17.5,  1,     43,    10 ]
);

    @data have to contain two arrays, the legend values and the values of the datasets.

    If you don't have a value for a point in a dataset, you can use undef, and the point will be skipped.

    [ 1,     undef,     5,     6,     3,     1.5,   undef,     3,     4 ]

  • -substitutionvalue => real number,

    If you have a no real number value in a dataset, it will be replaced by a constant value.

    Default : 0

    my @data = (
     [ '1st', '2nd', '3rd', '4th', '5th', '6th', '7th', '8th', '9th' ],
     [ 1,     "--",     5,     6,     3,     1.5,   1,     3,     4 ],
);
$PieGraphDummies->plot( \@data,
  -substitutionvalue => '12',
);
 # mistake, -- and NA will be replace by 12

    -substitutionvalue have to be a real number (ex : 12, .25, 02.25, 5.2e+11, etc ...)

redraw

Redraw the chart.

If you have used clearchart for any reason, it is possible to redraw the chart. Tk::ForDummies::Graph::Pie supports the configure and cget methods described in the Tk::options manpage. If you use configure method to change a widget specific option, the modification will not be display. If the chart was already displayed and if you not resize the widget, call redraw method to resolv the bug.

...
$fenetre->Button(-text => "Change title", -command => sub { 
  $PieGraphDummies->configure(-title => "other title"); 
  } 
)->pack;
...
# title will be changed but not displayed if you not resize the widget.
 
...
$fenetre->Button(-text => "Change title", -command => sub { 
  $PieGraphDummies->configure(-title => "other title"); 
  $PieGraphDummies->redraw; 
  } 
)->pack;
...
# OK, title will be changed and displayed without resize the widget.

zoom

zoom the chart (vertical and horizontal zoom).

$PieGraphDummies->zoom($zoom);

$zoom must be an integer great than 0.

Ex : 300*300 size
$PieGraphDummies->zoom(50); # size divide by 2 => 150*150
...
$PieGraphDummies->zoom(200); # size multiplie by 2 => 600*600
...
$PieGraphDummies->zoom(120); # 20% add in each axis => 360*360
...
$PieGraphDummies->zoom(100); # original resize 300*300.

zoomx

Horizontal zoom.

# original canvas size 300*300
$PieGraphDummies->zoomx(50); # new size : 150*300
...
$PieGraphDummies->zoom(100); # new size : 300*300

zoomy

Vertical zoom.

# original canvas size 300*300
$PieGraphDummies->zoomy(50); # new size : 300*150
...
$PieGraphDummies->zoom(100); # new size : 300*300

SEE ALSO

See Tk::Canvas for details of the standard options.

See Tk::ForDummies::Graph, Tk::ForDummies::Graph::FAQ, GD::Graph.

AUTHOR

Djibril Ousmanou, <djibel at cpan.org>

BUGS

Please report any bugs or feature requests to bug-tk-fordummies-graph at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Tk-ForDummies-Graph. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

perldoc Tk::ForDummies::Graph::Pie

You can also look for information at:

COPYRIGHT & LICENSE

Copyright 2009 Djibril Ousmanou, all rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.