Djibril Ousmanou > Tk-Chart > Tk::Chart::Bars

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Module Version: 1.06   Source  

NAME ^

Tk::Chart::Bars - Extension of Canvas widget to create bars graph.

SYNOPSIS ^

  #!/usr/bin/perl
  use strict;
  use warnings;
  use Tk;
  use Tk::Chart::Bars;

  my $mw = MainWindow->new(
    -title      => 'Tk::Chart::Bars example',
    -background => 'white',
  );
  my $chart = $mw->Bars(
    -title      => 'My graph title',
    -xlabel     => 'X Label',
    -ylabel     => 'Y Label',
    -background => 'snow',
  )->pack(qw / -fill both -expand 1 /);

  my @data = (
    [ '1st', '2nd', '3rd', '4th', '5th', '6th', '7th', '8th', '9th' ],
    [ 1,     2,     5,     6,     3,     1,     1,     3,     4 ],
    [ 4,     2,     5,     2,     3,     5,     7,     9,     12 ],
    [ 1,     2,     12,    6,     3,     5,     1,     23,    5 ]
  );

  # Add a legend to the graph
  my @Legends = ( 'legend 1', 'legend 2', 'legend 3' );
  $chart->set_legend(
    -title       => 'Title legend',
    -data        => \@Legends,
    -titlecolors => 'blue',
  );

  # Add help identification
  $chart->set_balloon();

  # Create the graph
  $chart->plot( \@data );

  MainLoop();

DESCRIPTION ^

Tk::Chart::Bars is an extension of the Canvas widget. It is an easy way to build an interactive bar graph into your Perl Tk widget. The module is written entirely in Perl/Tk.

You can set a background gradient color.

You can change the color, font of title, labels (x and y) of the graph. You can set an interactive legend. The axes can be automatically scaled or set by the code.

When the mouse cursor passes over a bar or its entry in the legend, the bar and its entry will be turned to a color (that you can change) to help identify it.

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

BACKGROUND GRADIENT COLOR ^

You can set a background gradient color by using all methods of Tk::Canvas::GradientColor. By default, it is not enabled.

To enabled background gradient color the first time, you firstly have to call enabled_gradientcolor method and configure your color and type of gradient with set_gradientcolor.

  $chart->enabled_gradientcolor();
  $chart->set_gradientcolor(
      -start_color => '#6585ED',
      -end_color   => '#FFFFFF',
  );

Please, read "WIDGET-SPECIFIC METHODS" in Tk::Canvas::GradientColor documentation to know all available configurations.

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 ^

Name: Overwrite
Class: OverWrite
Switch: -overwrite

If set to 0, bars of different data sets will be drawn next to each other. If set to 1, they will be drawn in front of each other.

  -overwrite => 1, # 0 or 1

Default : 0

Name: Cumulate
Class: Cumulate
Switch: -cumulate

If this attribute is set to a true value, the data sets will be cumulated. This means that they will be stacked on top of each other.

A side effect of this is that overwrite will be set to a true value.

If you have negative values in your data sets, setting this option might produce odd results. Of course, the graph itself would be quite meaningless.

  -cumulate => 1, # 0 or 1

Default : 0

Name: Cumulatepercent
Class: CumulatePercent
Switch: -cumulatepercent

If this attribute is set to a true value, the data sets will be cumulated as percentage. This means that they will be stacked on top of each other and each bar will have the same height.

A side effect of this is that overwrite will be set to a true value.

If you have negative values in your data sets, setting this option might produce odd results. Of course, the graph itself would be quite meaningless.

  -cumulatepercent => 1, # 0 or 1

Default : 0

Name: Showvalues
Class: ShowValues
Switch: -showvalues

Set this to 1 to display the value of each data point above the point or bar itself. No effort is being made to ensure that there is enough space for the text.

If -overwrite or -cumulate set to 1, the values will not be hide by bars.

  -showvalues => 0, # 0 or 1

Default : 1

Name: BarsValuescolor
Class: BarsValuesColor
Switch: -barsvaluescolor

Color of each data point above the bar if -showvalues set to 1.

  -barsvaluescolor => 'white',

Default : black

Name: Spacingbar
Class: SpacingBar
Switch: -spacingbar

Set this to 1 to display remove space between each bar.

  -spacingbar => 0, # 0 or 1

Default : 1

Name: Outlinebar
Class: OutlineBar
Switch: -outlinebar

Change color of border bars.

  -outlinebar => 'blue',

Default : 'black'

WIDGET-SPECIFIC OPTIONS for graphs with axes. ^

See "WIDGET-SPECIFIC OPTIONS" in Tk::Chart::Lines

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.

add_data

$chart->add_data(\@NewData, ?$legend)

This method allows you to add data in your graph. If you have already plot data using plot method and if you want to add new data, you can use this method. Your graph will be updade.

clearchart

$chart->clearchart

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

disabled_automatic_redraw

$chart->disabled_automatic_redraw

When the graph is created and the widget size changes, the graph is automatically re-created. Call this method to avoid resizing.

  $chart->disabled_automatic_redraw;  

delete_balloon

$chart->delete_balloon

If you call this method, you disable help identification which has been enabled with set_balloon method.

enabled_automatic_redraw

$chart->enabled_automatic_redraw

Use this method to allow your graph to be recreated automatically when the widget size change. When the graph is created for the first time, this method is called.

  $chart->enabled_automatic_redraw;  

plot

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

To display your graph the first time, plot the graph by using this method.

redraw

Redraw the graph.

If you have used cleargraph for any reason, it is possible to redraw the graph. Tk::Chart::Bars 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 graph was already displayed and if you not resize the widget, call redraw method to resolv the bug.

  ...
  $mw->Button(
  -text    => 'Change xlabel', 
  -command => sub { 
      $chart->configure(-xlabel => 'red'); 
    }, 
  )->pack;
  ...
  # xlabel will be changed but not displayed if you not resize the widget.
    
  ...
  $mw->Button(
    -text => 'Change xlabel', 
    -command => sub { 
      $chart->configure(-xlabel => 'red'); 
      $chart->redraw; 
    } 
  )->pack;
  ...
  # OK, xlabel will be changed and displayed without resize the widget.

set_balloon

$chart->set_balloon(? %Options)

If you call this method, you enable help identification. When the mouse cursor passes over a plotted line or its entry in the legend, the line and its entry will be turn into a color (that you can change) to help the identification. set_legend method must be set if you want to enabled identification.

set_legend

$chart->set_legend(? %Options)

View a legend for the graph and allow to enabled identification help by using set_balloon method.

zoom

$chart->zoom(integer);

Zoom the graph. The x-axis and y-axis will be zoomed. If your graph has a 300*300 size, after a zoom(200), the graph will have a 600*600 size.

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

zoomx

Zoom the graph the x-axis.

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

zoomy

Zoom the graph the y-axis.

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

EXAMPLES ^

In the demo directory, you have a lot of script examples with their screenshot. See also the http://search.cpan.org/dist/Tk-Chart/MANIFEST web page of Tk::Chart.

SEE ALSO ^

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

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

AUTHOR ^

Djibril Ousmanou, <djibel at cpan.org>

BUGS ^

Please report any bugs or feature requests to bug-Tk-Chart at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Tk-Chart. 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::Chart::Bars

You can also look for information at:

ACKNOWLEDGEMENTS ^

COPYRIGHT & LICENSE ^

Copyright 2011 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.

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