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Originally Posted by enonod
I ... have never noticed anything odd
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Trust me
, between versions 1.21 and 1.25 there was a problem even if you didn't notice it. I don';t know if it was in earlier versions but I have changed a lot of the library internally and am not going back to find out!
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If moving to x,y would this routine need to be called for every movement
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Depends what you mean by movement. Basically if you are going to assign to X or Y then you may need to erase the sprite first as the library will now no longer know where it was and so won't erase it properly. If you are letting it move itself each tick you don't need to do it. It will be obvious if it is needed.
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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?
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Yes, it should be a lot faster. I'll have to think about whether such a facility could fit in the present architecture of the library.