Graphic 用VC画直线、画椭圆、画矩形、画点，选择所要绘制的图形，拖动鼠标即可完成绘制，同时程序还演示了如何读取和写入TXT文件。-Graphic with VC draw a straight line, painted oval, rectangular painting, drawing point, select the desired drawn graphics, drag the mouse to complete the drawing, and the program a