Template::Plugin::GD::Image - Interface to GD Graphics Library

    [% USE im = GD.Image(width, height) %]

    [% FILTER null;
        USE gdc = GD.Constants;
        USE im  = GD.Image(200,100);
        black = im.colorAllocate(0  ,0,  0);
        red   = im.colorAllocate(255,0,  0);
        r = im.string(gdc.gdLargeFont, 10, 10, "Large Red Text", red);
        im.png | stdout(1);
       END;
    -%]

    [% FILTER null;
        USE im = GD.Image(100,100);
        # allocate some colors
        black = im.colorAllocate(0,   0, 0);
        red   = im.colorAllocate(255,0,  0);
        blue  = im.colorAllocate(0,  0,  255);
        # Draw a blue oval
        im.arc(50,50,95,75,0,360,blue);
        # And fill it with red
        im.fill(50,50,red);
        # Output binary image in PNG format
        im.png | stdout(1);
       END;
    -%]

    [% FILTER null;
        USE im   = GD.Image(100,100);
        USE c    = GD.Constants;
        USE poly = GD.Polygon;

        # allocate some colors
        white = im.colorAllocate(255,255,255);
        black = im.colorAllocate(0,  0,  0);
        red   = im.colorAllocate(255,0,  0);
        blue  = im.colorAllocate(0,  0,255);
        green = im.colorAllocate(0,  255,0);

        # make the background transparent and interlaced
        im.transparent(white);
        im.interlaced('true');

        # Put a black frame around the picture
        im.rectangle(0,0,99,99,black);

        # Draw a blue oval
        im.arc(50,50,95,75,0,360,blue);

        # And fill it with red
        im.fill(50,50,red);

        # Draw a blue triangle
        poly.addPt(50,0);
        poly.addPt(99,99);
        poly.addPt(0,99);
        im.filledPolygon(poly, blue);

        # Output binary image in PNG format
        im.png | stdout(1);
       END;
    -%]

The GD.Image plugin provides an interface to GD.pm's GD::Image class. The GD::Image class is the main interface to GD.pm.

It is very important that no extraneous template output appear before or after the image. Since some methods return values that would otherwise appear in the output, it is recommended that GD.Image code be wrapped in a null filter. The methods that produce the final output (eg, png, jpeg, gd etc) can then explicitly make their output appear by using the stdout filter, with a non-zero argument to force binary mode (required for non-modern operating systems).

See GD for a complete description of the GD library and all the methods that can be called via the GD.Image plugin. See Template::Plugin::GD::Constants for a plugin that allows you access to GD.pm's constants.

Thomas Boutell wrote the GD graphics library.

Lincoln D. Stein wrote the Perl GD modules that interface to it.

Craig Barratt <craig@arraycomm.com> wrote the original GD plugins for the Template Toolkit (2001).

Andy Wardley <abw@cpan.org> extracted them from the TT core into a separate distribution for TT version 2.15.

Copyright (C) 2001 Craig Barratt <craig@arraycomm.com>, 2006 Andy Wardley <abw@cpan.org>.

The GD.pm interface is copyright 1995-2000, Lincoln D. Stein.

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

Template::Plugin::GD, GD