[cairo] Cairo with GTK GUI integration, getting inverse transformation matrix
ldo at geek-central.gen.nz
Mon Jan 18 15:35:53 PST 2016
On Tue, 19 Jan 2016 00:05:31 +0100, Johannes Bauer wrote:
> I noticed the cairo_ctx matrix is pre-set to accomodate for the window
> (i.e. already has the correct panning displacement accounted for). So
> it's unwise to just overwrite it (messes up the coordinate system).
But you should still be able to make temporary changes to it, bracketed
by cairo_save()/cairo_restore(). Within these, you can use
concatenate additional transformations onto the existing matrix.
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