153 lines
2.8 KiB
Lua
153 lines
2.8 KiB
Lua
------------------------------------------------
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--作者： xihan
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--日期： 2019-05-06
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--文件： Vector2.lua
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--模块： Vector2
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--描述： Vector2的运算
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------------------------------------------------
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local L_Sqrt = math.sqrt
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local L_Setmetatable = setmetatable
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local L_Rawget = rawget
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local L_Acos = math.acos
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local L_Clamp = math.Clamp
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local L_Format = string.format
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local Vector2 = {}
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local function New(x, y)
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return L_Setmetatable({x = x or 0, y = y or 0}, Vector2)
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end
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function Vector2:Set(x, y)
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self.x = x or 0
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self.y = y or 0
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end
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function Vector2:Get()
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return self.x, self.y
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end
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function Vector2:Clone()
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return New(self.x, self.y)
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end
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function Vector2:Magnitude()
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return L_Sqrt(self.x * self.x + self.y * self.y)
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end
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function Vector2:SqrMagnitude()
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return self.x * self.x + self.y * self.y
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end
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function Vector2:GetNormalize()
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local _v = self:Clone()
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return _v:Normalize()
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end
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function Vector2:Normalize()
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local _num = self:Magnitude()
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if _num == 1 then
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return self
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elseif _num > 1e-05 then
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self:Div(_num)
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else
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self:Set(0, 0)
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end
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return self
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end
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function Vector2:Div(d)
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self.x = self.x / d
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self.y = self.y / d
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return self
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end
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function Vector2:Mul(d)
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self.x = self.x * d
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self.y = self.y * d
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return self
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end
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function Vector2:Add(b)
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self.x = self.x + b.x
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self.y = self.y + b.y
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return self
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end
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function Vector2:Sub(b)
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self.x = self.x - b.x
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self.y = self.y - b.y
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return
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end
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Vector2.__add = function(va, vb)
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return New(va.x + vb.x, va.y + vb.y)
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end
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Vector2.__sub = function(va, vb)
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return New(va.x - vb.x, va.y - vb.y)
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end
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Vector2.__mul = function(va, d)
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return New(va.x * d, va.y * d)
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end
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Vector2.__div = function(va, d)
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return New(va.x / d, va.y / d)
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end
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Vector2.__unm = function(va)
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return New(-va.x, -va.y)
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end
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Vector2.__eq = function(va, vb)
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return (va - vb):SqrMagnitude() < 1e-10
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end
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Vector2.__tostring = function(self)
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return L_Format("[%s,%s]", self.x, self.y)
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end
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Vector2.__index = function(t, k)
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return L_Rawget(Vector2, k)
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end
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local L_Metatable = {
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up = function()
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return New(0, 1)
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end,
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down = function()
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return New(0, -1)
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end,
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right = function()
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return New(1, 0)
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end,
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left = function()
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return New(-1, 0)
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end,
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zero = function()
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return New(0, 0)
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end,
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one = function()
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return New(1, 1)
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end
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}
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L_Metatable.__index = function(t, k)
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if L_Metatable[k] then
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return L_Metatable[k]()
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end
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end
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L_Metatable.__call = function(t, x, y)
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local _typeX = type(x)
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if _typeX == "number" or _typeX == "nil" then
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return New(x, y)
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else
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return New(x.x, x.y)
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end
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end
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L_Setmetatable(Vector2, L_Metatable)
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return Vector2
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