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.IX Title "CAD::Drawing::Manipulate::Graphics 3"
.TH CAD::Drawing::Manipulate::Graphics 3 "2008-01-04" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "Name"
.IX Header "Name"
CAD::Drawing::Manipulate::Graphics \- Gimp meets \s-1CAD\s0?
.SH "AUTHOR"
.IX Header "AUTHOR"
Eric L. Wilhelm <ewilhelm at cpan dot org>
.PP
http://scratchcomputing.com
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
This module is copyright (C) 2004\-2006 by Eric L. Wilhelm.  Portions
copyright (C) 2003 by Eric L. Wilhelm and A. Zahner Co.
.SH "LICENSE"
.IX Header "LICENSE"
This module is distributed under the same terms as Perl.  See the Perl
source package for details.
.PP
You may use this software under one of the following licenses:
.PP
.Vb 4
\&  (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)
.Ve
.SH "NO WARRANTY"
.IX Header "NO WARRANTY"
This software is distributed with \s-1ABSOLUTELY\s0 \s-1NO\s0 \s-1WARRANTY\s0.  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.
.SH "Modifications"
.IX Header "Modifications"
The source code of this module is made freely available and
distributable under the \s-1GPL\s0 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.
.PP
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.
.SH "Methods"
.IX Header "Methods"
All of these are CAD::Drawing methods (I force my own inheritance:)
.Sh "image_init"
.IX Subsection "image_init"
Initialize the image at \f(CW$addr\fR 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.
.PP
.Vb 1
\&  $drw->image_init($addr);
.Ve
.Sh "image_crop"
.IX Subsection "image_crop"
Crops an image and its definition (actually, changes its insert point)
according to the points given by \f(CW@crop_points\fR (which maybe had better be
within the object (but I don't really sweat that.))
.PP
@crop_points should be in world coordinates as follows:
.PP
.Vb 6
\&  @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]
.Ve
.PP
.Vb 1
\&  $drw->image_crop($addr, \e@crop_points);
.Ve
.Sh "image_scale"
.IX Subsection "image_scale"
Scales both the image and the definition by \f(CW$scale\fR, starting at
\&\f(CW@base_point\fR.
.PP
.Vb 1
\&  $drw->image_scale($addr, $scale, \e@base_point);
.Ve
.Sh "image_rotate"
.IX Subsection "image_rotate"
This leaves the definition orthoganal, expands the underlying image
object, and resets the insert point and size properties accordingly.
.PP
.Vb 1
\&  $drw->image_rotate($addr, $angle, \e@point);
.Ve
.PP
The current implementation does not handle the change to the image
clipping boundary.
.Sh "image_swap_context"
.IX Subsection "image_swap_context"
This involves a scaling of the image (the contexts should be aligned
over each other at this point or everything will go to hell.)  Do your
own move / rotate / crop before calling this, because all this does is
to scale the underlying image object such that the vec property of the
image definition at \f(CW$dest_addr\fR can be used correctly.
.PP
Note that this does not \*(L"swap\*(R" the image to \f(CW$dest_addr\fR, rather it uses
the image definition of \f(CW$dest_addr\fR to change the image object and
definition at \f(CW$source_addr\fR.
.PP
Also note that the image must fit completely inside (I think) of the
destination in order for the composite to work correctly.
.PP
.Vb 1
\&  $drw->image_swap_context($source_addr, $dest_addr);
.Ve