获取图片旋转后的坐标点

--图片旋转后的坐标点

--在图片里添加四个端点，通过四个端点来获取图片坐标点。

function GameScene:createLayerFarm()
    local layerFarm = cc.Layer:create()

	--图片精灵 width 100  height 200
    self.shell_22 = cc.Sprite:create("100-200.png")
    self.shell_22:setPosition(cc.p(200,200))
    self.shell_22:setAnchorPoint(cc.p(0.5, 0))
    self:addChild(self.shell_22, 20)
	
	--创建ImageView对象
    self.up_left = ccui.ImageView:create()
    self.up_right = ccui.ImageView:create()
    self.down_left = ccui.ImageView:create()
    self.down_right = ccui.ImageView:create()
    
    --设置四个端点的坐标 [100 图片的宽度 200 图片的高度]
    self.up_left:setPosition(cc.p(0,200))		--右上角
    self.up_right:setPosition(cc.p(100,200))	--右下角
    self.down_left:setPosition(cc.p(0,0))		--左下角
    self.down_right:setPosition(cc.p(100,0))	--右下角
    
	--添加到旋转的图片中
    self.shell_22:addChild(self.up_left)
    self.shell_22:addChild(self.up_right)
    self.shell_22:addChild(self.down_left)
    self.shell_22:addChild(self.down_right)
    

    local upLeftPos = self.up_left:getWorldPosition()
    print("upLeftPos : ", upLeftPos.x, " upLeftPos : ", upLeftPos.y)
    
    local up_rightPos = self.up_right:getWorldPosition()
    print("up_rightPos : ", up_rightPos.x, " up_rightPos : ", up_rightPos.y)
    
    local down_leftPos = self.down_left:getWorldPosition()
    print("down_leftPos : ", down_leftPos.x, " down_leftPos : ", down_leftPos.y)
    
    local down_rightPos = self.down_right:getWorldPosition()
    print("down_rightPos : ", down_rightPos.x, " down_rightPos : ", down_rightPos.y)
	
	--触摸处理事件处理方法
    local function onTouchBegan(touch, event)
        local location = touch:getLocation()
        -- CCTOUCHBEGAN event must return true
        -------------------------------------------------------------------
        
        local originX, originY = self.shell_22:getPosition()
        
        local direction = cc.p(location.x - originX, location.y - originY)
        local degree = math.atan2(direction.y, direction.x)
        print("degree : ", degree)
        self.shell_22:setRotation(90-degree*180/math.acos(-1.0))
        
		--获取图片旋转后的图片端点
        local upLeftPos = self.up_left:getWorldPosition()
        print("upLeftPos : ", upLeftPos.x, " upLeftPos : ", upLeftPos.y)

        local up_rightPos = self.up_right:getWorldPosition()
        print("up_rightPos : ", up_rightPos.x, " up_rightPos : ", up_rightPos.y)

        local down_leftPos = self.down_left:getWorldPosition()
        print("down_leftPos : ", down_leftPos.x, " down_leftPos : ", down_leftPos.y)

        local down_rightPos = self.down_right:getWorldPosition()
        print("down_rightPos : ", down_rightPos.x, " down_rightPos : ", down_rightPos.y)
        
		--通过上面获的端点来绘制矩形区域
        local drawNode = cc.DrawNode:create()
        local vertices = 
            {
                cc.p(down_leftPos.x,down_leftPos.y),  	--左下角 
                cc.p(down_rightPos.x,down_rightPos.y),  --右下角
                cc.p(up_rightPos.x,up_rightPos.y),  	--右上角
                cc.p(upLeftPos.x,upLeftPos.y)   		--左上角
            }
		--绘制边框
        drawNode:drawPoly(vertices, 4, true, cc.c4f(1,0,0,1))
        self:addChild(drawNode, 20)
        
        return true
    end	
	

    return layerFarm
end