Name
CAD::Drawing::Manipulate::Graphics - Gimp meets CAD?
AUTHOR
Eric L. Wilhelm <ewilhelm at cpan dot org>
http://scratchcomputing.com
COPYRIGHT
This module is copyright (C) 2004-2006 by Eric L. Wilhelm. Portions 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, his former employer, and any other contributors 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.
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);