52 lines
1.2 KiB
Lua
52 lines
1.2 KiB
Lua
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local FindVector = {}
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FindVector.__index = FindVector
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local function newFindVector( x, y )
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return setmetatable( { x = x or 0, y = y or 0 }, FindVector )
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end
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function FindVector.__unm( vTbl )
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return newFindVector( -vTbl.x, -vTbl.y )
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end
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function FindVector.__add( a, b )
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return newFindVector( a.x + b.x, a.y + b.y )
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end
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function FindVector.__sub( a, b )
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return newFindVector( a.x - b.x, a.y - b.y )
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end
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function FindVector.__mul( a, b )
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if type( a ) == "number" then
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return newFindVector( a * b.x, a * b.y )
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elseif type( b ) == "number" then
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return newFindVector( a.x * b, a.y * b )
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else
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return newFindVector( a.x * b.x, a.y * b.y )
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end
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end
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function FindVector.__div( a, b )
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return newFindVector( a.x / b, a.y / b )
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end
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function FindVector.__eq( a, b )
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return a.x == b.x and a.y == b.y
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end
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function FindVector:__tostring()
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return "(" .. self.x .. ", " .. self.y .. ")"
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end
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function FindVector:ID()
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if self._ID == nil then
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local x, y = self.x, self.y
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self._ID = 0.5 * ( ( x + y ) * ( x + y + 1 ) + y )
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end
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return self._ID
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end
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return setmetatable( FindVector, { __call = function( _, ... ) return newFindVector( ... ) end } ) |