67 lines
1.5 KiB
Lua
67 lines
1.5 KiB
Lua
vec2 = {
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x = 0,
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y = 0,
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mag = function(self)
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return sqrt(self.x^2+self.y^2)
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end,
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dot = function(self,v)
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return self.x * v.x + self.y * v.y
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end,
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normal = function(self)
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local mag = self:mag()
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return vec2:new(self.x/mag, self.y/mag)
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end,
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bounce = function(self, n)
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local n = n:normal()
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return n * -2 * self:dot(n) + self
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end,
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}
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vec2.__eq = function(v1,v2) return v1.x == v2.x and v1.y == v2.y end
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vec2.__add = function(v1,v2) return vec2:new(v1.x+v2.x,v1.y+v2.y) end
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vec2.__sub = function(v1,v2) return vec2:new(v1.x-v2.x,v1.y-v2.y) end
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vec2.__mul = function(o1,o2)
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local s,v
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if(tonum(o1)) then
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s = o1
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v = o2
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else
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s = o2
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v = o1
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end
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return vec2:new(v.x*s,v.y*s)
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end
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vec2.__div = function(v,s) return vec2:new(v.x/s,v.y/s) end
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vec2.__unm = function(v) return vec2:new(-v.x,-v.y) end
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vec2.__tostring = function(v) return "{x: "..v.x..",y: "..v.y.."}" end
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vec2.__index = vec2
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function vec2:new(x,y)
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local x = x or 0
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local y = y or 0
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local o = {x=x,y=y}
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setmetatable(o, self)
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o.__index = self
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return o
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end
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function vec2:print_debug(v)
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local v = v or vec2:new(0,1)
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print("vec: "..vec2.__tostring(self))
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print("mag: "..self:mag())
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print("dot: "..self:dot(v))
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print("normal: "..vec2.__tostring(self:normal()))
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print("bounce: "..vec2.__tostring(self:bounce(v)))
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print("inv: "..vec2.__tostring(-self))
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end
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local v = vec2:new(1,1)
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local s = 3
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print(v * s)
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print(s * v)
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assert(false, "If two lines above are identical, mul operands are now interchangeable!")
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