determine line intersecting with rect?

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DJWoodgate

I'm sure there was a line routine on the code archives that clips to the screen boundary, by Skidracer I think, which may be helpful. From memory though it may be embedded in another bit of code by Blitz Support.

Here... http://www.blitzbasic.co.nz/codearcs/codearcs.php?code=380

Edit. You could of course just use a viewport but if you need the new endpoints then an adaptation of this should be able to provide them.