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Delete intersect.lua.

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That was specific to exo-encounter and is unlikely to be useful in
other games.
This commit is contained in:
Phil Hagelberg 2018-11-30 17:39:52 -08:00
parent 43f73a0dcd
commit 6909ea5d4e
1 changed files with 0 additions and 15 deletions
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15
lib/intersect.lua
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@ -1,15 +0,0 @@
-- https://love2d.org/wiki/General_math
return function(l1p1x,l1p1y, l1p2x,l1p2y, l2p1x,l2p1y, l2p2x,l2p2y)
local a1,b1,a2,b2 = l1p2y-l1p1y, l1p1x-l1p2x, l2p2y-l2p1y, l2p1x-l2p2x
local c1,c2 = a1*l1p1x+b1*l1p1y, a2*l2p1x+b2*l2p1y
local det,x,y = a1*b2 - a2*b1
if det==0 then return false, "The lines are parallel." end
x,y = (b2*c1-b1*c2)/det, (a1*c2-a2*c1)/det
if not (math.min(l1p1x,l1p2x) <= x and x <= math.max(l1p1x,l1p2x) and
math.min(l1p1y,l1p2y) <= y and y <= math.max(l1p1y,l1p2y)) or
not (math.min(l2p1x,l2p2x) <= x and x <= math.max(l2p1x,l2p2x) and
math.min(l2p1y,l2p2y) <= y and y <= math.max(l2p1y,l2p2y)) then
return false, "The lines don't intersect."
end
return x,y
end