yzyCli/u3d/Lua/utils/CoVector2.lua

CoVector2 = CoVector2 or BaseClass()
local CoVector2 = CoVector2
function CoVector2:__init(x, y)
	self.x = x
	self.y = y
	
	-- local now_time = Status.NowTime
	-- if CoVector2.cache_time == nil or CoVector2.cache_time < now_time then
	-- 	-- if CoVector2.call_num == 1 then
	-- 		print("创建Vector2个数", CoVector2.call_num, now_time)
	-- 		-- print(xxxxx+3)
	-- 	-- end
	-- 	CoVector2.call_num = 0
	-- 	CoVector2.cache_time = now_time
	-- end
	-- CoVector2.call_num = CoVector2.call_num + 1
	-- if CoVector2.call_num >1 then
	-- 	-- print("创建Vector2个数", CoVector2.call_num, now_time)
	-- 	print(xxxxx+3)
	-- end

	local meta_table = getmetatable(self)
	meta_table.__add = function (v1, v2)
		return CoVector2.New(v1.x + v2.x, v1.y + v2.y)
	end

	meta_table.__sub = function (v1, v2)
		return CoVector2.New(v1.x - v2.x, v1.y - v2.y)
	end

	meta_table.__mul = function (v1, v2)
		local f = tonumber(v2)
		if f ~= nil then
			return CoVector2.New(v1.x * f, v1.y * f)
		else
			-- print("~+~+~+ co.Vector2 相乘2", v1.x, v1.y, v2.x, v2.y)
			return CoVector2.New(v1.x * v2.x, v1.y * v2.y)
		end
	end

	meta_table.__div = function (v1, v2)
		local f = tonumber(v2)
		if f ~= nil then
			return CoVector2.New(v1.x / f, v1.y / f)
		else
			return CoVector2.New(v1.x / v2.x, v1.y / v2.y)
		end
	end

	meta_table.__tostring = function (v1)
		return string.format("co.Vector2(%.4f, %.4f)", v1.x, v1.y)
	end
end
function CoVector2:__defineVar()
	return {
		_class_type = self,
		--_cid = self._id,
		_iid = _in_obj_ins_id,
		x = 0,
		y = 0
	}
end
function CoVector2:__delete()
	-- body
end

function CoVector2:copyVector2(v)
	self.x, self.y = v.x, v.y
end
function CoVector2:setXY(x, y)
	self.x, self.y = x, y
end
function CoVector2:Mul(x, y)
	y = y or x
	if x and y then
		self.x, self.y = self.x * x, self.y * y
	end
end

function CoVector2:length()
	return math.sqrt(self.x * self.x + self.y * self.y)
end

function CoVector2:squaredLength()
	return self.x * self.x + self.y * self.y
end

--把对象存进缓存队列
function CoVector2:DeleteV()
	local free_num = co.free_vector2_num

	if co.free_vector2_num < 100 then
		co.free_vector2_num = free_num + 1
		co.free_vector2_list[free_num+1] = self
	end
end


function CoVector2:normalise()
	local l = math.sqrt(self.x * self.x + self.y * self.y)
	if l >= 1e-6 then
		local f = 1 / l
		self.x = self.x * f
		self.y = self.y * f
	end
	return l
end

function CoVector2:distance(v2)
	local dx = self.x - v2.x
	local dy = self.y - v2.y
	return math.sqrt(dx * dx + dy * dy)
end

function CoVector2:squaredDistance(v2)
	local dx = self.x - v2.x
	local dy = self.y - v2.y
	return dx * dx + dy * dy
end

function CoVector2:dotProduct(v2)
	return self.x * v2.x + self.y * v2.y
end

function CoVector2:crossProduct(v2)
	return self.x * v2.y - self.y * v2.x
end

function CoVector2:angleBetween(v2)
	local lenProduct = self:length() * v2:length()
	if lenProduct < 1e-6 then
		lenProduct = 1e-6
	end
	
	local f = self:dotProduct(v2) / lenProduct
	if f < -1 then
		f = -1 
	elseif f > 1 then
		f = 1
	end

	return math.acos(f)
end

--返回值顺时针方向为正角度
function CoVector2:angleTo(v2)
	local angle = self:angleBetween(v2)
	if self:crossProduct(v2) < 0 then
		angle = math.pi * 2 - angle
	end
	return angle
end

function CoVector2:toGameVector2()
	if self.game_vector2 == nil then
		self.game_vector2 = Game.Vector2(self.x, self.y)
	else
		self.game_vector2.x = self.x
		self.game_vector2.y = self.y
	end
	return self.game_vector2
end


--沿着dir方向移动dist距离
function CoVector2:Move(dir, dist)
	self.x = self.x + dir.x * dist
	self.y = self.y + dir.y * dist
end

--把V1向量按照“X轴正方向转到V2方向”的方式旋转
function CoVector2:rotateFromXAxisTo(v2, proj_modify)
	local r1 = co.XAix:angleTo(self)
	local r2 = co.XAix:angleTo(v2)
	local r  = r1 + r2
	local l = self:length()
	
	local cos_r = math.cos(r)
	local sin_r = math.sin(r)
	
	--在转到90度的时候要缩短一些，以产生透视效果
	local p = proj_modify and (cos_r * 0.2929 + 0.7071) or 1
	self.x, self.y = cos_r * l, sin_r * l * p
	return self
end

--radian为正数时顺时针旋转
function CoVector2:rotate(radian )
	local r = co.XAix:angleTo(self)
	r = r + radian
	local l = self:length()
	local cos_r = math.cos(r)
	local sin_r = math.sin(r)
	self.x, self.y = cos_r * l, sin_r * l
	return self
end