public void physics(double ox, double oy, double osize) { xcp = ox; ycp = oy; tv = tv + ta; rv = rv + ra; t = t + tv; r = r + rv; convert(); if (x + size / 2 >= 1000) { if (tv > 0) { tv = -Math.abs(tv); } } if (x - size / 2 <= 0) { if (tv < 0) { tv = Math.abs(tv); } } }