[cairo] how to rotate a picture

[jacky]

It should be:

  cairo_translate(cr, any_value, any_value);
  cairo_rotate(cr, angle);
  cairo_set_source_surface (cr, surface, -width/2,
-height/2);

--- Bill Spitzak <spitzak at thefoundry.co.uk>wrote:

> fitren wrote:
> > Hi:
> > 	I want to rotate a "png" picture,I used
> "cairo_rotate" to do it,it did rotate ,but it
> rotated surrounded with the left top corner.
> > 	The question is :how to rotate it surrounded by
> the middle of the picture?
> 
> cairo_translate(cairo_t, -width/2,-height/2);
> cairo_rotate(cairo_t, angle);
> cairo_translate(cairo_t, width/2, height/2);
> 
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> 



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