Although we don't have this implemented yet, I tend to
agree with results provided by Forrest. Scale( 0.5, 2 ) scales about the origin,
not about the center of the APS (as shown in the reference
images).
We could create a new CGM with the object centered at (0,0)
for Test Suite purposes, but we should also keep this one. It's unrealistic to
assume that any object to be transformed will be centered at
(0,0).
Benoit.
From: Forrest Carpenter [mailto:forrest@sdicgm.com]
Sent: Wednesday, December 10, 2008 12:53 PM
To: 'WebCGM'
Subject: [cgmo-webcgm] Scale test
All,
We believe the reference images for
scale test are not correct. The elements are approximately centered at 0 in the
x direction, but in the y direction the elements are centered around 5000. When
a scale up in the y is applied the object should be shifted up when scaled and
when a scale down in y is applied the object should shift
down.
I recommend changing the reference
CGM file such that the object is centered at (0,0)
The first image below is the result
of x scale = .5 and the y scale = 2 in our
implementation.
The second image below is the result
of x scale = 2 and y scale = .5 in our
implementation.
Regards
Forrest
VDC extent (-5717,3061)
(9372,14736)
