hilz wrote:
Hi: I use this function to revert the transform to the initial state of the svg tree
canvas.resetRenderingTransform();
All this does, for the JSVGCanvas, is setRenderingTransform to the identity transform. So you can skip this entirely and just set the rendering transform to what you want.
I don't seem to be able to calculate the theta right. can someone please tell me how to get theta?
This isn't well defined, in the general case. If you can assume a uniform scale in X&Y you can simply scale by the squareroot of the determinant of the affinetransform, and set the translate portion to 0 to get just the 'rotation' portion of the matrix. If you really want theta then read the description of getRotateInstance and do the trig ;)
and if you see something wrong in what i am doing above, please point it out.
In the general case you can't do what you want. But if you only have uniform scale and translates then you should be ok.
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