VKVG_IDENTITY_MATRIX vkvg_matrix_get_scale vkvg_matrix_init vkvg_matrix_init_identity vkvg_matrix_init_rotate vkvg_matrix_init_scale vkvg_matrix_init_translate vkvg_matrix_invert vkvg_matrix_multiply vkvg_matrix_rotate vkvg_matrix_scale vkvg_matrix_transform_distance vkvg_matrix_transform_point vkvg_matrix_translate

vkvg_matrix_transform_distance() void vkvg_matrix_transform_distance ( const vkvg_matrix_t *  matrix, float *  dx, float *  dy  ) Transforms the distance vector (dx ,dy ) by matrix . This is similar to #cairo_matrix_transform_point() except that the translation components of the transformation are ignored. The calculation of the returned vector is as follows: dx2 = dx1 * a + dy1 * c; dy2 = dx1 * b + dy1 * d; Affine transformations are position invariant, so the same vector always transforms to the same vector. If (x1 ,y1 ) transforms to (x2 ,y2 ) then (x1 +dx1 ,y1 +dy1 ) will transform to (x1 +dx2 ,y1 +dy2 ) for all values of x1 and x2 . Parameters matrix a valid vkvg_matrix_t to use to transform distance dx X component of a distance vector. An in/out parameter dy Y component of a distance vector. An in/out parameter