[cairo] Cairo transformations. Old bug that has been solved?

[Behdad Esfahbod]

On 10/09/11 11:21, Dov Grobgeld wrote:
>     return np.matrix([[c[0],c[1],c[4]], [c[2],c[3],c[5]], [0,0,1]])

This is wrong.  From cairo docs:

 * @xx: xx component of the affine transformation
 * @yx: yx component of the affine transformation
 * @xy: xy component of the affine transformation
 * @yy: yy component of the affine transformation
 * @x0: X translation component of the affine transformation
 * @y0: Y translation component of the affine transformation

 * <programlisting>
 *     x_new = xx * x + xy * y + x0;
 *     y_new = yx * x + yy * y + y0;
 * </programlisting>

So, it only makes sense that xx, xy, and x0 go on the first row, that is, c0,
c2, c4.  You are doing c0, c1, c4.

behdad