local VisibleRect = class("VisibleRect")

function VisibleRect:ctor()
	self.s_visibleRect = cc.rect(0,0,0,0)
end

-- 初始化可见区域
function VisibleRect:lazyInit()
    if (self.s_visibleRect.width == 0.0 and self.s_visibleRect.height == 0.0) then	
        self.s_visibleRect.x = 0
        self.s_visibleRect.y = 0
        local size  = cc.Director:getInstance():getWinSize()
        self.s_visibleRect.width  = size.width
        self.s_visibleRect.height = size.height
    end
end

function VisibleRect:updateVisibleRect()
	-- 这里只更新大小
    local size  = cc.Director:getInstance():getWinSize()
    self.s_visibleRect.width  = size.width
    self.s_visibleRect.height = size.height
end
	

function VisibleRect:getVisibleRect()
    self:lazyInit()
    return cc.rect(self.s_visibleRect.x, self.s_visibleRect.y, self.s_visibleRect.width, self.s_visibleRect.height)
end

-- 将屏幕坐标转换成GLView坐标
function VisibleRect:convertScreenToGLView(x, y)
	self:lazyInit()
	return cc.p(x , self:getVisibleRect().height - y)
end

-- 将屏幕坐标转换成坐标系的坐标
function VisibleRect:convertScreenToCoordinate(x, y)
	self:lazyInit()
	local floorPlane = cc.Plane:new(cc.vec3(0,1,0) , 0);

	-- 计算出mainlayer的世界位置
	local ray = app.mainCamera:pickRay(x / self.s_visibleRect.width , y / self.s_visibleRect.height);
	local distance = ray:intersectsPlane(floorPlane);
	if distance >= 0 then
		return ray:getPoint(distance);
	else
		return ray:getPoint(0);
	end

end

-- 将屏幕坐标转换成坐标系的坐标
function VisibleRect:convertScreenToCoordinate2D(x, y)
	self:lazyInit()
	local floorPlane = cc.Plane:new(cc.vec3(0,0,1) , 0);

	-- 计算出mainlayer的世界位置
	local ray = app.mainCamera:pickRay(x / self.s_visibleRect.width , y / self.s_visibleRect.height);
	local distance = ray:intersectsPlane(floorPlane);
	if distance >= 0 then
		return ray:getPoint(distance);
	else
		return ray:getPoint(0);
	end

end

-- 鼠标位置转换成世界坐标
function VisibleRect:convertScreenToWorldPos(x , y)
	local pos = self:convertScreenToCoordinate(x , y);
	return app.mainLayer:convertToWorldSpace(pos);
end

-- 鼠标位置转换成世界坐标
function VisibleRect:convertScreenToWorldPos2D(x , y)
	local pos = self:convertScreenToCoordinate2D(x , y);
	return app.mainLayer:convertToWorldSpace(pos);
end

function VisibleRect:left()
    self:lazyInit()
    return cc.p(self.s_visibleRect.x, self.s_visibleRect.y+self.s_visibleRect.height/2)
end

function VisibleRect:right()
    self:lazyInit()
    return cc.p(self.s_visibleRect.x+self.s_visibleRect.width, self.s_visibleRect.y+self.s_visibleRect.height/2)
end

function VisibleRect:top()
    self:lazyInit()
    return cc.p(self.s_visibleRect.x+self.s_visibleRect.width/2, self.s_visibleRect.y+self.s_visibleRect.height)
end

function VisibleRect:bottom()
    self:lazyInit()
    return cc.p(self.s_visibleRect.x+self.s_visibleRect.width/2, self.s_visibleRect.y)
end

function VisibleRect:center()
    self:lazyInit()
    return cc.p(self.s_visibleRect.x+self.s_visibleRect.width/2, self.s_visibleRect.y+self.s_visibleRect.height/2)
end

function VisibleRect:leftTop()
    self:lazyInit()
    return cc.p(self.s_visibleRect.x, self.s_visibleRect.y+self.s_visibleRect.height)
end

function VisibleRect:rightTop()
    self:lazyInit()
    return cc.p(self.s_visibleRect.x+self.s_visibleRect.width, self.s_visibleRect.y+self.s_visibleRect.height)
end

function VisibleRect:leftBottom()
    self:lazyInit()
    return cc.p(self.s_visibleRect.x,self.s_visibleRect.y)
end

function VisibleRect:rightBottom()
    self:lazyInit()
    return cc.p(self.s_visibleRect.x+self.s_visibleRect.width, self.s_visibleRect.y)
end

return VisibleRect;