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Author Topic: Clipped line routine ?  (Read 6177 times)

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Offline Hayleia

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Re: Clipped line routine ?
« Reply #15 on: November 17, 2012, 12:08:47 pm »
I agree with the ElseIf part (I had put it in my first routine but didn't put it in this one yet because I first wanted it to work before optimizing) but not with the -1->r1 because in the line that changes r2 needs r1 to be unchanged, so I have to change r1 only after I changed r2.
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Offline squidgetx

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Re: Clipped line routine ?
« Reply #16 on: November 17, 2012, 12:58:12 pm »
Oops,  you're right about that. Anyway here are some algebraic optimizations. I subbed in X for r1-r3 and Y for r2-r4 for readability but i think you'll have to put that into the code each time (or you could make a lambda out of it to save on size, but i don't know how that would affect the speed.
Code: [Select]
Lbl LINE

If r1<<0
 -Y*r3//X+r4->r2
 0->r1
ElseIf r1>94
 94-r1*Y//X+r2->r2
 94->r1
End

If r2<<0
 -X*r2//Y+r1->r1
 0->r2
ElseIf r2>62
 62-r2*X//Y+r1->r1
 62->r2
End

If r3<<0
 -Y*r3//X+r4->r4
 0->r3
ElseIf r3>94
 94-r1*Y//X+r2->r4
 94->r3
End

If r4<<0
 -X*r2//Y+r1->r3
 0->r4
ElseIf r4>62
 62-r2*X//Y+r1->r3
 62->r4
End
Line(r1,r2,r3,r4)
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« Last Edit: November 17, 2012, 12:58:43 pm by squidgetx »
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