co = co or {}
local co = co
local CoVector2 = CoVector2
local math = math
--返回一个CoVector2
function co.Vector2(x, y)
	-- print(debug.traceback(""))
	-- print("111111111111co.Vector2")
	return CoVector2.New(x, y)
end

co.free_vector2_list = co.free_vector2_list or {}
co.free_vector2_num = co.free_vector2_num or 0
function co.TempVector2(x, y)	
	local free_num = co.free_vector2_num
	-- print("获取TempVector2:", free_num)

	if free_num > 0 then
		local v = co.free_vector2_list[free_num]
		co.free_vector2_list[free_num] = nil
		co.free_vector2_num = free_num - 1

		v.x, v.y = x, y
		return v
	else
		local v = CoVector2.New(x, y)
		return v
	end
end

function co.InitTempVectorArray()
	for i=co.free_vector2_num, 90 do
		local v = CoVector2.New(0, 0)
		v:DeleteV()
	end
end


function co.Vector2FromTable(t)
	return CoVector2.New(t.x, t.y)
end

function co.RadianToDegree(radian)
	return radian / math.pi * 180
end

function co.DegreeToRadian(degree)
	return degree / 180 * math.pi
end

function co.TableXY(x, y)
	return {x=x, y=y}
end

function co.PointDistance(t1, t2)
	local xl = math.abs(t1.x - t2.x)
	local yl = math.abs(t1.y - t2.y)
	return math.sqrt(xl*xl + yl*yl)
end

function co.TableXYZ(x, y, z)
	return {x=x, y=y, z=z}
end

function co.TableXYFromPos(pos)
	return {x=pos.x, y=pos.y}
end

--把一个{x=.., y=..}的table归1化
function co.NormaliseXYTable(v)
	local l = math.sqrt(v.x * v.x + v.y * v.y)
	if l >= 1e-6 then
		local f = 1 / l
		v.x = v.x * f
		v.y = v.y * f
	end
	return l
end

--把一个{x=.., y=..},z=..的table归1化
function co.NormaliseXYZTable(v)
	local l = math.sqrt(v.x * v.x + v.y * v.y + v.z*v.z)
	if l >= 1e-6 then
		local f = 1 / l
		v.x = v.x * f
		v.y = v.y * f
		v.z = v.z * f
	end
	return l
end

function co.MulXYTable(t1, t2)
	return {x = t1.x*t2.x, y = t1.y*t2.y}
end

function co.SubtractXYTable(t1, t2 )
	return {x=t1.x-t2.x, y=t1.y-t2.y}
end

function co.AddXY(t1, t2 )
	return {x= t1.x + t2.x, y = t1.y+t2.y}
end

function co.AddXYZ(t1, t2 )
	return {x= t1.x + t2.x, y = t1.y+t2.y, z = t1.z + t2.z}
end

function co.MoveXYTable(t1, dir, dist)
	t1.x = t1.x + dir.x * dist
	t1.y = t1.y + dir.y * dist
end

co.NegativeYAix = co.Vector2(0, -1)
co.XAix = co.Vector2(1, 0)