[cairo] Re: cairo_get_current_point bug ?

[Mike Emmel]

Also if it would set cr->status to no current point I
get my path_is_empty function thats quite useful.

Mike


On 9/14/06, Mike Emmel <mike.emmel at gmail.com> wrote:
> Here is the function
>
> void
> cairo_get_current_point (cairo_t *cr, double *x_ret, double *y_ret)
> {
>     cairo_status_t status;
>     cairo_fixed_t x_fixed, y_fixed;
>     double x, y;
>
>     status = _cairo_path_fixed_get_current_point (&cr->path, &x_fixed,
> &y_fixed);
>     if (status == CAIRO_STATUS_NO_CURRENT_POINT) {
>     x = 0.0;
>     y = 0.0;
>     } else {
>     x = _cairo_fixed_to_double (x_fixed);
>     y = _cairo_fixed_to_double (y_fixed);
>     _cairo_gstate_backend_to_user (cr->gstate, &x, &y);
>     }
>
>     if (x_ret)
>     *x_ret = x;
>     if (y_ret)
>     *y_ret = y;
> }
>
>
> The problem is that if no path is set the current transform is not
> used to transform the points
> If you say translate then add a move_to 0,0 you get different results.
>
> So I think it should be.
>
>   if (status == CAIRO_STATUS_NO_CURRENT_POINT) {
>     x = 0.0;
>     y = 0.0;
>     _cairo_gstate_backend_to_user (cr->gstate, &x, &y);
>     } else {
>
>
> The workaround is to always do a move_to(0,0) in a new cairo_t.
>
> Mike
>