I see, thanks. This is basically a rounding error that results from integer values being used instead of floats. I intend to fix this, but you can also work around this issue pretty easily by explicitly using float coordinates, i.e. <code>center.x - 64.0</code> instead of <code>center.x - 64</code> etc. Just add a <code>.0</code> to your coordinates for now and it should work.