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                                            loonger

更改了取色器的UI、修改了选择器拖动逻辑

### 更改了取色器的UI，仿照画图软件。 ![IMG_0198](https://user-images.githubusercontent.com/20554776/129712187-f15dd5ac-21a6-4fa6-aed2-b9bd46bbd011.JPG) ![IMG_0197](https://user-images.githubusercontent.com/20554776/129712205-da101c52-1a44-4653-9a0c-b3c69b0626c6.JPG) ### 修改了选择器拖动逻辑之前每当有新触控点，选择器的中心会移动到触控点。修改之后只有当拖动的时候才会移动取色器

取色器取色点移出屏幕会出现取色异常的bug

![取色器边缘检测](https://user-images.githubusercontent.com/20554776/129540828-380e604f-2659-420c-b918-46b57bd3a42a.png)