Saved 10% of sketch draw time by simply doing the transformation calculations in-place rather than calling surveyCoordsToViewCoords. I'd prefer a transform class that modifies one but the Coord2D class is final
Saved another 10% by only setting the paint colour when necessary. In a later PR I intend to create enough member Paint objects such that we never need to modify the current one
Pulling setAlpha outside of the loop also gave noticeable time savings
surveyCoordsToViewCoords. I'd prefer a transform class that modifies one but theCoord2Dclass isfinalPaintobjects such that we never need to modify the current onesetAlphaoutside of the loop also gave noticeable time savings