Re: Getting pattern extents.
Nicola Fontana <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Organization | eNTiDi |
| Message-ID | <[email protected]> |
Il Sun, 14 Dec 2014 13:42:43 +0200 Donn <[email protected]> scrisse: > Question: How do I get the new extents of pat now? Either via cairo or > by basic math? i.e. It's twice as big and has moved. How to get its new > top and left, right and bottom? Hi, from what I understood you can use cairo_matrix_transform_point() on the old four points and by applying all the transformations you piled up on the CTM. In your example that transformations would be: cairo_matrix_init_scale(transformations, 2, 2) cairo_matrix_translate(transformations, some_x, some_y) If you do not have access anymore to the transformations you applied, you can get them knowing the old and the actual CTM: # To be tested cairo_matrix_invert(old_ctm) cairo_matrix_multiply(transformations, ctm, old_ctm) Ciao. -- Nicola -- cairo mailing list [email protected] http://lists.cairographics.org/mailman/listinfo/cairo