graphics::primitive(3pm) [debian man page]

Graphics::Primitive(3pm)				User Contributed Perl Documentation				  Graphics::Primitive(3pm)

NAME

       Graphics::Primitive - Device and library agnostic graphic primitives

SYNOPSIS

       Graphics::Primitive is a device and library agnostic system for creating and manipulating various graphical elements such as Borders,
       Fonts, Paths and the like.

	   my $c = Graphics::Primitive::Component->new(
	     background_color => Graphics::Color::RGB->new(
		 red => 1, green => 0, blue => 0
	     ),
	     width => 500, height => 350,
	     border => new Graphics::Primitive::Border->new( width => 5 )
	   );

	   my $driver = Graphics::Primitive::Driver::Cairo->new(format => 'SVG');

	   $driver->prepare($c);
	   $driver->finalize($c);
	   $driver->draw($c);

	   $driver->write($filename)

DESCRIPTION

       Graphics::Primitive is library agnostic system for drawing things.

       The idea is to allow you to create and manipulate graphical components and then pass them off to a Driver for actual drawing.

CONCEPTS

       The root object for Graphics::Primitive is the Component.  Components contain all the common elements that you'd expect: margins, padding,
       background color etc.

       The next most important is the Container.  Containers are Components that can hold other Components.  Containers have all the attributes
       and methods of a Component with the addition of the layout_manager attribute for us with Layout::Manager.

       Another important Component is the Canvas.  The Canvas differs from other components by being a container for various Geometry::Primitive
       objects.  This allows drawing of arbitrary shapes that do not fit existing components.

DRAWING LIFECYCLE

       After creating all your components, there is a lifecycle that allows them to do their internal housekeeping to prepare for eventual
       drawing.  The lifecycle is: prepare, layout and pack.  Detailed explanation of these methods can be found in Component.

PREPARATION

       Graphics::Primitive::Component has a "prepared" flag.  This flag is set as part of the "prepare" method (shocking, I know).  If this flag
       is set, then subsequent calls to "prepare" are ignored.	Containers also have a prepare flag, but this flag is not set when calling
       "prepare".  A Container's flag should be set by the layout manager.  More information may be found with Layout::Manager.

INSPIRATION

       Most of the concepts that you'll find in Graphics::Primitive are inspired by Cairo <http://cairographics.org>'s API and CSS
       <http://www.w3.org/Style/CSS/>'s box model.

AUTHOR

       Cory Watson, "<gphat@cpan.org>"

CONTRIBUTORS

       Florian Ragwitz

ACKNOWLEDGEMENTS

       Many of the ideas here come from my experience using the Cairo library.

COPYRIGHT &; LICENSE
       Copyright 2008-2010 by Cory G Watson.

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

perl v5.12.3							    2011-06-02						  Graphics::Primitive(3pm)

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Graphics::Primitive::Canvas(3pm)			User Contributed Perl Documentation			  Graphics::Primitive::Canvas(3pm)

NAME

       Graphics::Primitive::Canvas - Component composed of paths

DESCRIPTION

       Graphics::Primitive::Canvas is a component for drawing arbitrary things.  It holds Paths and Operations.

SYNOPSIS

	 use Graphics::Primitive::Canvas;

	 my $canvas = Graphics::Primitive::Canvas->new;
	 $canvas->move_to($point); # or just $x, $y
	 $canvas->do($op);

DESCRIPTION

       The Canvas is a container for multiple Paths.  It has a path that is the operative path for all path-related methods.  You can treat the
       Canvas as if it was a path, calling methods like line_to or move_to.

       When you are ready to perform an operation on the path, call the do method with the operation you want to call as an argument.  Drawing a
       line and stroking it would look like:

	 $canvas->move_to(0, 0);
	 $canvas->line_to(10, 10);
	 my $op = Graphics::Primitive::Operation::Stroke->new;
	 $stroke->brush->color(
	     Graphics::Color::RGB->new(red => 0, blue => 1, green => 1)
	 );
	 $canvas->do($op);

       When you instantiate a Canvas a newly instantiated path resides in path.  After you call do that current path is moved to the paths list
       and new path is placed in current_path.	If you want to keep the path around you can call save before do then call restore to put a saved
       copy of the path back into path.

METHODS

   Constructor
       new Creates a new Graphics::Primitive::Canvas

   Instance Methods
       do  Given an operation, pushes the current path onto the path stack.

	     FIXME: Example

       path
	   The current path this canvas is using.

       path_count
	   Count of paths in paths.

       paths
	   Arrayref of hashrefs representing paths combined with their operations:

	     [
	       {
		   path => $path,
		   op	=> $op
	       },
	     ]

       restore
	   Replace the current path by popping the top path from the saved path list.

       save
	   Copy the current path and push it onto the stack of saved paths.

       saved_paths
	   List of saved paths.  Add to the list with save and pop from it using restore.

       saved_path_count
	   Count of paths saved in saved_paths.

AUTHOR

       Cory Watson <gphat@cpan.org>

COPYRIGHT &; LICENSE
       Copyright 2008-2010 by Cory G Watson.

       You can redistribute and/or modify this code under the same terms as Perl itself.

perl v5.12.3							    2010-08-21					  Graphics::Primitive::Canvas(3pm)

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