Name
    CAD::Drawing::Manipulate::Graphics - Gimp meets CAD?

AUTHOR
      Eric L. Wilhelm
      ewilhelm at sbcglobal dot net
      http://pages.sbcglobal.net/mycroft

COPYRIGHT
    This module is copyright (C) 2003 by Eric L. Wilhelm and A. Zahner Co.

LICENSE
    This module is distributed under the same terms as Perl. See the Perl
    source package for details.

    You may use this software under one of the following licenses:

      (1) GNU General Public License
        (found at http://www.gnu.org/copyleft/gpl.html)
      (2) Artistic License
        (found at http://www.perl.com/pub/language/misc/Artistic.html)

NO WARRANTY
    This software is distributed with ABSOLUTELY NO WARRANTY. The author and
    his employer will in no way be held liable for any loss or damages
    resulting from its use.

Modifications
    The source code of this module is made freely available and
    distributable under the GPL or Artistic License. Modifications to and
    use of this software must adhere to one of these licenses. Changes to
    the code should be noted as such and this notification (as well as the
    above copyright information) must remain intact on all copies of the
    code.

    Additionally, while the author is actively developing this code,
    notification of any intended changes or extensions would be most helpful
    in avoiding repeated work for all parties involved. Please contact the
    author with any such development plans.

Changes
      0.01 First public release

Methods
    All of these are CAD::Drawing methods (I force my own inheritance:)

  image_init

    Initialize the image at $addr based on the value at the fullpath key.
    This establishes the contained Image::Magick object and loads the image
    into memory in the image_handle key.

      $drw->image_init($addr);

  image_crop

    Crops an image and its definition (actually, changes its insert point)
    according to the points given by @crop_points (which maybe had better be
    within the object (but I don't really sweat that.))

    @crop_points should be in world coordinates as follows:

      @crop_points = (
        [$lower_left_x , $lower_left_y ],
            [$upper_right_x, $upper_right_y],
            );
      # note that you can get these as 
      # ($drw->getExtentsRec($something))[0,2]

      $drw->image_crop($addr, \@crop_points);

  image_scale

    Scales both the image and the definition by $scale, starting at
    @base_point.

      $drw->image_scale($addr, $scale, \@base_point);

  image_rotate

    This leaves the definition orthoganal, expands the underlying image
    object, and resets the insert point and size properties accordingly.

      $drw->image_rotate($addr, $angle, \@point);

    The current implementation does not handle the change to the image
    clipping boundary.

  image_swap_context

    This involves a scaling of the image (the contexts should be aligned
    over each other at this point or everything will go to hell.) Do your
    own move / rotate / crop before calling this, because all this does is
    to scale the underlying image object such that the vec property of the
    image definition at $dest_addr can be used correctly.

    Note that this does not "swap" the image to $dest_addr, rather it uses
    the image definition of $dest_addr to change the image object and
    definition at $source_addr.

    Also note that the image must fit completely inside (I think) of the
    destination in order for the composite to work correctly.

      $drw->image_swap_context($source_addr, $dest_addr);