包含三个文件，可以实现通过移动鼠标来画画的功能。包括了画画的界面，左键点击鼠标不放手即可作画。类似于电脑上的画图。-Contains three files, can be achieved by moving the mouse to draw function. Includes drawing interface, left click the mouse not letting go can be painted. Similar to the drawing on the comput