8 lines
231 B
Plaintext
8 lines
231 B
Plaintext
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x_at_y = function(startx,starty, endx,endy, y)
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-- x at a given y on a line
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-- Could be nil when the line is parallel to the x axis.
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if starty == endy then
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return
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end
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return (endx-startx)/(endy-starty)*(y-starty) + startx
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end
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