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Which is smoother/most efficient: moving by incrementing an actor's x/y co-ordinate, or by setting angle/directional velocity? I'm finding turning a bit jerky when using x+=5 or y+=5 to move my main actor, and I'm wondering whether changing over to angle/directional velocity will be smoother.

I did try changing to using angle/directional velocity, but I'm currently checking the x/y co-ordinate before moving to make sure the player doesn't exit the playfield. When using angle/directional velocity, you have to check the player's location using a timer or using collision to stop it before exiting the playfield, and I have found this to be a bit unreliable.

Any advice appreciated!

As my opinion, the xvelocity/yvelocity/angle movement are the smoothest ways. They also skip some pixels but no so much as x + 5 etc.

if you use xvelocity and yvelocity, (as far as I know), you sure can do x/y/velocity plus angle and so on at the same time.