final double pointSeparationSqd = (prevX-px) * (prevX-px) + (prevY-py) * (prevY-py);
if (pointSeparationSqd > pointSeparationForArrowsSqd)
{
final double pointSeparationSqd = (prevX-px) * (prevX-px) + (prevY-py) * (prevY-py);
if (pointSeparationSqd > pointSeparationForArrowsSqd)
{