[enonod]

I use square sprites without any transparency and have never noticed anything odd. They move constantly.
If moving to x,y would this routine need to be called for every movement and will it slow it down (if the artefacts are present)?

A question for your experience and knowledge of how sprites work. I know this can be done outside the sprite, but could there be any advantage, speed wise or any other way, if a sprite had a destination property (dX,dY) such that the sprite would automatically travel toward it and upon arrival trigger an event?
My thinking is that in this way the testing of each pixel position passed would be by internal code rather than user (external) code.