Here is applicable code I have now. It still isn't rotating right...
<snip>
SVGOMGElement svgG = ((SVGOMGElement) n);
SVGTransformList svgTL = ((SVGTransformable)
svgG).getTransform().getBaseVal();
AffineTransform at = AffineTransform.getScaleInstance(scaleX,scaleY);
at.translate(x, y);
at.rotate(angle*(Math.PI/180), x+(scaleX*w/2.0), y+(scaleY*h/2.0));
SVGMatrix svgM = new SVGOMMatrix(at);
SVGTransform svgT = new SVGOMTransform();
svgT.setMatrix(svgM);
svgTL.clear();
svgTL.appendItem(svgT);
</snip>
If I do getTranslateInstance first and the .scale, I get results that
are even less correct.
plb
-----Original Message-----
From: Bishop, Michael W. CONTR J9C880
[mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 11, 2007 12:13 PM
To: [email protected]
Subject: RE: Rotation about center of a G
I use them in my utilities class. I got it working well enough to
rotate, translate, and scale in any order (to the user) without having
things go crazy, but it sure took awhile.
Michael Bishop
-----Original Message-----
From: Paul L. Bogen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 11, 2007 12:53 PM
To: [email protected]
Subject: RE: Rotation about center of a G
That is why my original code calculates the product of the affines and
then applies that. I could never get the provided .rotate(), .scale(),
.translate() methods to work at all
plb
-----Original Message-----
From: Bishop, Michael W. CONTR J9C880
[mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 11, 2007 11:51 AM
To: [email protected]
Subject: RE: Rotation about center of a G
The rotate function of transforms takes an x and a y coordinate where
you can specify which point you want to rotate around. I'm not sure why
you want to do the rotation first. It'd be easier to translate to your
desired position, scale, then rotate. You can operate on scale and
rotate independently but rotating affects the same positions in the
matrix as scaling and translating; once you rotate, your original values
for scaling and translating are lost.
Michael Bishop
-----Original Message-----
From: Paul L. Bogen [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 11, 2007 12:32 PM
To: [email protected]
Subject: RE: Rotation about center of a G
But it will still rotate about the origin and not the center of the G,
correct?
plb
-----Original Message-----
From: Bishop, Michael W. CONTR J9C880
[mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 11, 2007 9:37 AM
To: [email protected]
Subject: RE: Rotation about center of a G
Transforms were a giant headache for me. The best way I found to deal
with it was to apply the operations in this order: Translate, Scale,
Rotate.
If I wanted to "adjust" any of the values, I'd work backwards to that
point. In order to translate, for instance, I'd revert the rotation
angle, revert the scale, translate by the new values, then reapply the
scale and rotation. It might not be the best way, but it was the only
way I could find to allow the user to apply these operations
arbitrarily. I don't even account for stretch/skew.
I've got a utility class that helps with this stuff.
Michael Bishop
-----Original Message-----
From: Paul L. Bogen [mailto:[EMAIL PROTECTED]
Sent: Tuesday, July 10, 2007 12:13 PM
To: [email protected]
Subject: Rotation about center of a G
I am trying to implement a function that translates a G to the origin,
rotates it, translates it back to the original position, scales it, and
then translates it to a target position. However it doesn't seem to work
if I comment out the rotation bits translation and scaling work
perfectly. Any ideas what I am doing wrong?
<snip>
SVGOMGElement svgG = ((SVGOMGElement) n); SVGTransformList svgTL =
((SVGTransformable) svgG).getTransform().getBaseVal();
svgTL.consolidate();
SVGMatrix svgM;
if(svgTL.getNumberOfItems() == 0)
{
SVGTransform svgT = new SVGOMTransform();
svgM = new SVGOMMatrix(new AffineTransform(1,0,0,1,0,0));
svgT.setMatrix(svgM);
svgTL.appendItem(svgT);
}
SVGOMMatrix mat1 = new SVGOMMatrix(new
AffineTransform(1,0,0,1,-w/2,-h/2));
SVGOMMatrix mat2 = new SVGOMMatrix(new
AffineTransform(Math.cos(angle),Math.sin(angle),-Math.sin(angle),Math.co
s(angle),0,0));
SVGOMMatrix mat3 = new SVGOMMatrix(new
AffineTransform(1,0,0,1,w/2,h/2));
SVGOMMatrix mat4 = new SVGOMMatrix(new
AffineTransform(scaleX,0,0,scaleY,0,0));
SVGOMMatrix mat5 = new SVGOMMatrix(new AffineTransform(1,0,0,1,x,y));
svgM = mat1;
svgM = svgM.multiply(mat2);
svgM = svgM.multiply(mat3);
svgM = svgM.multiply(mat4);
svgM = svgM.multiply(mat5);
svgTL.getItem(0).setMatrix(svgM);
</snip>
thanks,
plb
PAUL LOGASA BOGEN II
Programmer
KNOWLEDGE BASED SYSTEMS, INC.
1408 University Drive East
College Station, Texas 77840
Phone: 979-260-5274
Fax: 979-691-2928
www.kbsi.com
<file:///C:/Documents%20and%20Settings/plbogen/Application%20Data/Micros
oft/Signatures/www.kbsi.com>
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