> x = GGI_RP_DONTCARE;
> y = GGI_RP_SYNC;
As brian said, it is wise to reset the values before each call. However
a few extra words about how to get stuff flicker-free:
> while (pos_x < width) {
> /* clear screen to default color */
> ggiSetGCForeground(vis, ggiMapColor(vis, &col));
> ggiFillscreen(vis);
Don't do that, if it can be avoided. Filling the whole screen may take some
time and might thus cause flicker.
> draw_cross(vis, pos_x, pos_y, fcol);
> ggiWaitRayPos(vis, &x, &y);
> ggiFlush(vis);
Not a good sequence. Better is:
ggiWaitRayPos(vis, &x, &y);
draw_whatever();
ggiFlush();
This ensures the drawing takes place while the ray is retracing. Other
method depends on being inside a tight loop.
CU, Andy
--
= Andreas Beck | Email : <[EMAIL PROTECTED]> =
