Jamie Browning wrote:
I am attaching a test file to demonstrate this post.
I am attempting to implement getScreenCTM in ECMAScript (due to lack
of Adobe support :-().
I am looking at the batik source in an attempt to understand how to do
this. What I am trying to specifically understand is the relationship
between the context.getGlobalTransform/context.getScreenTransform
methods.
What I understand is this:
context.getScreenTransform: returns the matrix representing the
mapping of 'pixel' space to user space. So if I have a document of
width/height 200 and a window width/height (innerWidth/Height) of 400
then I will get a matrix (2 0 0 2 0 0) correct?
context.getGlobalTransform: returns the matrix representing the
mapping of this element to the document root. So again if I have a
rect (x/y=10w/h=100) in my 200*200 document I will get a matrix (2 0 0
2 10 10) correct?
If you look at my example you will see that I have an svg element
within an svg element. So what I don't understand is how this affects
the function of these methods, given that the elem.getScreenCTM works
perfectly in both cases ;-) in Batik.
context.getScreenTransform: if I am picking up events from within an
svg element that is not the root, does the output of this method give
differing results i.e. do I need to calculate the original matrix for
the root then multiply/concatenate to a new matrix for the current svg
element.
context.getGlobalTransform: if my element is within an svg element
that is not the root, how does this affect the matrix from this
element to the root. Again does it need to be multiplied by any other
factor.
Please forgive my ignorance on these matters but I have only a
rudimentary grasp of 2d geometry.
Thanks in advance
Jamie
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Furthermore I suppose I really need to understand what SVGContext is ...
Is it the nearest viewport element? Or does it refer to the underlying
Graphics2D object?
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