[cairo] Position a pattern at the tip of a rectangle

[Carl Worth]

Excerpts from thomas's message of Mon Aug 10 04:44:39 -0700 2009:
> I have a pattern which starts at (0,0) and ends at (1,1). I scale it by a
> factor of 200x, to get a pattern from (0,0) to (200,200). Now, I want to
> create a rectangle which exists from, say (300,300) to (500,500), and draw
> the pattern as if it started at the top left of the rectangle. How can
> this be done?

How exactly are you scaling the pattern? Are you doing that with
cairo_pattern_set_matrix after calling cairo_matrix_scale? If so, then
you should just be able to add a call to:

	cairo_matrix_translate (matrix, 300, 300);

before your call to cairo_matrix_scale. (You could call this after
cairo_matrix_scale as well, but then you would want to use coordinates
divided by the scale factor. That may even be easier depending on the
details of what you're doing.)

I hope that helps, and if not, please give use some more details as to
what you are doing so that we can hopefully help.

Have fun with cairo,

-Carl
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