wdw->get_root_coordinates(vx, vy, &rx, &ry);
rx += (rx >= cx ? -view_w : viewing->w);
ry += (ry >= cy ? -view_h : viewing->h);
wdw->get_root_coordinates(vx, vy, &rx, &ry);
rx += (rx >= cx ? -view_w : viewing->w);
ry += (ry >= cy ? -view_h : viewing->h);