使用vb.net编写的简单的绘图程序，可以用鼠标在窗体上绘制直线等图形，复杂的图形可以自行添加代码，只是起到抛砖引玉的作用。-Use vb.net prepared with a simple drawing program, you can draw a straight line and other graphics on the form with the mouse, complex graphics can add the code yourself, but play a valua