determine line intersecting with rect?
Blitz3D Forums/Blitz3D Programming/determine line intersecting with rect?
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| Hi, I know this is Blitz 3D specific, but I couldn't see a 2D specific forum. I have X & Y co-ords for each end of a line; an X & Y coord and a Height & Width value for a rectangle. I want to draw the line, but only the portion that is inside the rect (if any). So I need two new XY coords for the line. I could do loads of nested If... Thens checking each point against all others but I'm sure there must be a quite simple formula/equation to determine the two new endpoints quite neatly. But I can't think of it. Anyone know one offhand? |
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| 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. |
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| That example is a little different to what I was after but thanks anyway. I've cobbled something together okay in the meantime. |
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