Answering my own question, I have just realised that although scaling
with a zero value for sx or sy is valid mathematically, the resulting
matrix is non-invertible, and so gets picked up by Context.Scale, giving
an error immediately (rather than perhaps later down the line, in a more
obscure situation). Perhaps this might help others who wonder what is
going on!
On 11/04/13 13:14, Hywel wrote:
Using a Cairo.Matrix.Scale (sx, sy) with a zero value for either sx or
sy gives the correct result (the Xx or the Yy component of the matrix
is zero'd), but using Context.Scale with either zero value for sx or
sy gives the wrong result for the Context Transformation Matrix.
There seems to be no valid reason why these should differ
(mathematically they are valid, though perhaps unlikely, operations).
I'm not sure how the two functions call back into the Cairo 'C' code -
can anyone help or shed any light on this apparent anomaly?
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