[cairo] Storing vector information for drawing later
ml3p at onghu.com
Tue Nov 24 11:23:34 PST 2009
I'm not sure if I can phrase this question correctly, but here goes.
We're drawing a number of lines/ shapes as part of an application and a
few times a second, we may need to rotate or zoom, etc. the image. So,
I was wondering if there's an easy way for us to store a non-raster
(i.e. vector) copy of the shape that we are drawing so that when the
next turn comes around, we can easily apply the correct transformation
to the stored shape and render. I'm not sure how much of a performance
improvement it may have, but perhaps someone can guide if this makes any
sense at all.
Essentially, there's quite a bit of line_to, move_to, etc. that gets
called in drawing the shape. Now, I'm wondering if I can collect all of
these just before the cairo_stroke or cairo_fill and then reuse that
somewhere else after doing a rotate or something.
In some senses, I use the preserve API to repeat the same operation with
2 different line widths (a simple way to draw a thick line with a
border), but just wondering if there's something more complex that I can
use. Do paths offer this functionality?
11/25/2009 | 3:23 AM.
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