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Faster Polygon:unpack()

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This commit is contained in:
Matthias Richter 2012-05-19 12:41:25 +02:00
parent bf95f1e5fc
commit c3011ad841
1 changed files with 6 additions and 7 deletions
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13
polygon.lua
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@ -156,15 +156,14 @@ end
local newPolygon local newPolygon
-- unpack vertex coordinates, i.e. {x=p, y=q}, ... -> p,q, ...
local function unpackHelper(v, ...)
if not v then return end
return v.x,v.y,unpackHelper(...)
end
-- return vertices as x1,y1,x2,y2, ..., xn,yn -- return vertices as x1,y1,x2,y2, ..., xn,yn
function Polygon:unpack() function Polygon:unpack()
return unpackHelper( unpack(self.vertices) ) local v = {}
for i = 1,#self.vertices do
v[2*i-1] = self.vertices[i].x
v[2*i] = self.vertices[i].y
end
return unpack(v)
end end
-- deep copy of the polygon -- deep copy of the polygon