NAME

       Graphics::Primitive::Component - Base graphical unit

DESCRIPTION

       A Component is an entity with a graphical representation.

SYNOPSIS

         my $c = Graphics::Primitive::Component->new({
           origin => Geometry::Primitive::Point->new({
               x => $x, y => $y
           }),
           width => 500, height => 350
         });

LIFECYCLE

       prepare
           Most components do the majority of their setup in the prepare.  The goal of prepare is
           to establish it's minimum height and width so that it can be properly positioned by a
           layout manager.

             $driver->prepare($comp);

       layout
           This is not a method of Component, but a phase introduced by the use of
           Layout::Manager.  If the component is a container then each of it's child components
           (even the containers) will be positioned according to the minimum height and width
           determined during prepare.  Different layout manager implementations have different
           rules, so consult the documentation for each for details.  After this phase has
           completed the origin, height and width should be set for all components.

             $lm->do_layout($comp);

       finalize
           This final phase provides and opportunity for the component to do any final changes to
           it's internals before being passed to a driver for drawing.  An example might be a
           component that draws a fleuron at it's extremities.  Since the final height and width
           isn't known until this phase, it was impossible for it to position these internal
           components until now.  It may even defer creation of this components until now.

           It is not ok to defer all action to the finalize phase.  If you do not establish a
           minimum hieght and width during prepare then the layout manager may not provide you
           with enough space to draw.

               $driver->finalize($comp);

       draw
           Handled by Graphics::Primitive::Driver.

              $driver->draw($comp);

METHODS

   Constructor
       new Creates a new Component.

   Instance Methods
       background_color
           Set this component's background color.

       border
           Set this component's border, which should be an instance of Border.

       callback
           Optional callback that is fired at the beginning of the "finalize" phase.  This allows
           you to add some sort of custom code that can modify the component just before it is
           rendered.  The only argument is the component itself.

           Note that changing the position or the dimensions of the component will not re-layout
           the scene.  You may have weird results of you manipulate the component's dimensions
           here.

       class
           Set/Get this component's class, which is an abitrary string.  Graphics::Primitive has
           no internal use for this attribute but provides it for outside use.

       color
           Set this component's foreground color.

       fire_callback
           Method to execute this component's "callback".

       get_tree
           Get a tree for this component.  Since components are -- by definiton -- leaf nodes,
           this tree will only have the one member at it's root.

       has_callback
           Predicate that tells if this component has a "callback".

       height
           Set this component's height.

       inside_bounding_box
           Returns a Rectangle that defines the edges of the 'inside' box for this component.
           This box is relative to the origin of the component.

       inside_height
           Get the height available in this container after taking away space for padding, margin
           and borders.

       inside_width
           Get the width available in this container after taking away space for padding, margin
           and borders.

       margins
           Set this component's margins, which should be an instance of Insets.  Margins are the
           space outside the component's bounding box, as in CSS.  The margins should be outside
           the border.

       maximum_height
           Set/Get this component's maximum height.  Used to inform a layout manager.

       maximum_width
           Set/Get this component's maximum width.  Used to inform a layout manager.

       minimum_height
           Set/Get this component's minimum height.  Used to inform a layout manager.

       minimum_inside_height
           Get the minimum height available in this container after taking away space for
           padding, margin and borders.

       minimum_inside_width
           Get the minimum width available in this container after taking away space for padding,
           margin and borders.

       minimum_width
           Set/Get this component's minimum width.  Used to inform a layout manager.

       name
           Set this component's name.  This is not required, but may inform consumers of a
           component.  Pay attention to that library's documentation.

       origin
           Set/Get the origin point for this component.

       outside_height
           Get the height consumed by padding, margin and borders.

       outside_width
           Get the width consumed by padding, margin and borders.

       finalize
           Method provided to give component one last opportunity to put it's contents into the
           provided space.  Called after prepare.

       padding
           Set this component's padding, which should be an instance of Insets.  Padding is the
           space inside the component's bounding box, as in CSS.  This padding should be between
           the border and the component's content.

       page
           If true then this component represents stand-alone page.  This informs the driver that
           this component (and any children) are to be renderered on a single surface.  This only
           really makes sense in formats that have pages such as PDF of PostScript.

       prepare
           Method to prepare this component for drawing.  This is an empty sub and is meant to be
           overridden by a specific implementation.

       preferred_height
           Set/Get this component's preferred height.  Used to inform a layout manager.

       preferred_width
           Set/Get this component's preferred width.  Used to inform a layout manager.

       to_string
           Get a string representation of this component in the form of:

             $name $x,$y ($widthx$height)

       visible
           Set/Get this component's visible flag.

       width
           Set/Get this component's width.

AUTHOR

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

BUGS

       Please report any bugs or feature requests to "bug-geometry-primitive at rt.cpan.org", or
       through the web interface at
       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Geometry-Primitive>.  I will be notified,
       and then you'll automatically be notified of progress on your bug as I make changes.

COPYRIGHT & LICENSE

       Copyright 2008-2009 by Cory G Watson.

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