You're right, this isn't in JTS 1.8, but has been added to JTS 1.9 (at
least for rotation).
The best way to do this is to simply apply a sequence of base
transformation operations to the same AffineTransformation. E.g.
AffineTransformation t = new AffineTransformation();
...
t.compose(AffineTransformation.translationInstance(-x, -y);
t.compose(AffineTransformation.rotationInstance(alpha);
t.compose(AffineTransformation.translationInstance(x, y);
(I think I have this right.... Good reason to provide this in the API!)
Sunburned Surveyor wrote:
Is it possible to rotate and scale from designated coordinate, instead
of <0,0> using the AffineTransform class?
If this can't be done with the AffineTransform class, can it be done
with another class in JTS?
Thanks,
The Sunburned Surveyor
P.S. - The rotate and scale methods of the AffineTransform class did
not appear to have parameters that would allow me to designate a
coordinate to serve as the basis for the rotation and scaling. The
javadoc comments describing the class also make me suspect this is not
possible.
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Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022
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