[cairo] Always keep text in foreground?
dagoldman at yahoo.com
Mon Aug 16 22:04:33 PDT 2010
> 2010/8/16 Daniel Goldman <dagoldman at yahoo.com>:
> > Thanks for the replies. I ended up reading the data file twice, stroking
> > filling the polygons first pass, and applying the labels the second pass,
> > shown in a simplified form by Arjen. It was somewhat inconvenient, but not
> > big deal. I already knew that was a possible solution.
> > It's a big data file, which I would rather not read twice. But it's still
> > fast enough. It would even be possible to split the data file into two data
> > files: one with the points, the other with the labels. But I'll only do
> > if ever a speed problem.
> You can always do the drawing of the text to a second surface and
> combine them afterwards, like Benjamin suggested. The second surface
> for the text can be created with:
> text_surface = cairo_surface_create_similar(poly_surface,
> CAIRO_CONTENT_COLOR_ALPHA, width, height);
> This way you only have to go over your dataset once.
> > The reason I posted was to understand cairo better, to clarify if cairo
> > the luxury of automatically keeping the text in the foreground. I
> > Benjamin explaining why this is not the case. I can live without the
> > Daniel
Thanks. I'll try that.
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