调用colorbar函数，实现点击相应区域，画刷变为相应颜色。即调色板功能，同时还可以手写输入，存储手写输入，载入图片等功能-Call colorbar function, click on the appropriate region to achieve, the brush into the corresponding color. Namely palette functions, but also can be handwritten input, storage handwriting input, load images and other functions