Read/Write transform values

Maybe this has been discussed before but I could not find one article that
explains it.

I am trying to figure out the proper way to read/write element's transform
values. I.e. X, Y, Scale, 
Rotate, etc..

Below is a few things I have tried. Sometimes they work and sometimes they
don't. And I am not sure which way is correct.

Please point me in the right direction.

Thanks,

fireball.



Read
------
- X value:

((SVGOMGElement)elt).getTransform().getBaseVal().getItem(0).getMatrix().getE();
or
((SVGLocatable)elt).getScreenCTM().getE();


Write
------
- X value:

elt.setAttributeNS(null, "transform", "matrix(" + a + ",0,0," + d + "," + e
+ ", 
" + f + ")");
or
((SVGLocatable)elt).getScreenCTM().setE(e);



- Rotation angle:

((SVGOMGElement)elt).getTransform().getBaseVal().getItem(0).setRotate(Float.valueOf(rotate),
Float.valueOf(0), Float.valueOf(0));
or
((SVGLocatable)elt).getScreenCTM().rotate(Float.valueOf(45));

In the above we are setting the rotate value but how do we get(read) it?



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