a-star-visualization/vector2.lua at master · dtroitskiy/a-star-visualization · GitHub

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Vector2 = {}
Vector2.__index = Vector2

function Vector2:new(x, y)
	local vector = {
		x = x,
		y = y
	}
	setmetatable(vector, self)
	return vector
end

function Vector2:copy()
	return Vector2:new(self.x, self.y)
end

function Vector2:__tostring()
	return string.format("Vector2 (%f, %f)", self.x, self.y)
end

function Vector2:__eq(other)
	return self.x == other.x and self.y == other.y
end

function Vector2:__add(other)
	return Vector2:new(self.x + other.x, self.y + other.y)
end

function Vector2:__sub(other)
	return Vector2:new(self.x - other.x, self.y - other.y)
end

function Vector2:__mul(value)
	return Vector2:new(self.x * value, self.y * value)
end

function Vector2:__div(value)
	return Vector2:new(self.x / value, self.y / value)
end

function Vector2:zero()
	self.x = 0
	self.y = 0
end

function Vector2:isZero()
	return self.x == 0 and self.y == 0
end

function Vector2:length()
	return math.sqrt((self.x ^ 2) + (self.y ^ 2))
end

function Vector2:lengthSq()
	return (self.x ^ 2) + (self.y ^ 2)
end

function Vector2:normalize()
	local length = self:length()
	if length > 0 then
		self.x = self.x / length
		self.y = self.y / length
	end
end

function Vector2:dot(other)
	return self.x * other.x + self.y * other.y
end

function Vector2:perp()
	return Vector2:new(-self.y, self.x)
end