在微软经典示例Scribble程序基础上改造，主要功能是通过拖动鼠标绘制线条，添加了画笔画刷设置功能，以及在不同映射模式下绘图功能的实现。-Classic example of Microsoft Scribble program based on the transformation, the main function is by dragging the mouse to draw lines, add a painting st