Re: Read/Write transform values

On Mon, Aug 13, 2012 at 11:42 AM, fireball <[email protected]> wrote:

> Thanks! Jonathan.
>
> This makes things much cleaner and easier to deal with.
>
> The only thing is rotation. It does not sound straight forward like the
> other values (translate, shear, scale).
>
> Is there a simple way to set/get rotate value?
> I tried something like this for setting it but it did not work:
>
> String strTransform = elt.getAttributeNS(null,
> SVGConstants.SVG_TRANSFORM_ATTRIBUTE);
> TransformListParser p = new TransformListParser();
> AWTTransformProducer tp = new AWTTransformProducer();
> p.setTransformListHandler(tp);
> p.parse(strTransform);
> AffineTransform at = tp.getAffineTransform();
> at.rotate(Math.toRadians(Double.valueOf(rotateAngle)));
>
>

 This looks correct....did you also replace your original transform with
this one?

Something like this:

...
el.setAttributeNS(null, SVGConstants.SVG_TRANSFORM_ATTRIBUTE,
affineTransformToString(at));
....

    public String affineTransformToString(final AffineTransform at) {
        double[] matrix = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
        at.getMatrix(matrix);
        return matrixArrayToString(matrix);
    }

    public String matrixArrayToString(double[] vals) {
        return new StringBuilder("matrix(").append(vals[0]).append("
").append(vals[1]).append(" ").append(vals[2]).append("
").append(vals[3]).append(" ").append(vals[4]).append("
").append(vals[5]).append(") ").toString();
    }



> For getting it I had to parse the transform string myself to get rotate
> value.
>
> Note that my transform is like this: transform="matrix(a,b,c,d,e,f)
> rotate(angle)". Should rotate be part of the matrix?
>

both are correct.  I tend to use matrix only because of
 TransformListParser/AffineTransform, but that does not mean you can't
concat multiple matrices, or explicit transforms like rotate/scale...


>
> Any thoughts?
>
>
>
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