[cairo] Inverting the Y-axis

Owen Taylor otaylor at redhat.com
Wed Aug 10 10:03:19 PDT 2005

On Thu, 2005-08-11 at 02:12 +0930, Adrian Johnson wrote:
> Is there an easy way to invert the Y axis?
> I've tried
>     cairo_matrix_init(&m, 1, 0, 0, -1, 0, Y_MAX);
>     cairo_transform(cr, &m);
> however this causes text to be displayed upside down.

You can call cairo_set_font_matrix() if you are using the
toy API. No way to invert the axes if you are using Pango,
I'm afraid... the Pango rendering code all assumes that
text lines are ordered in order of increasing Y.


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