编写应用程序，可以利用鼠标绘制矩形和圆形，具体功能要求如下：

1、 通过单击工具条按钮（或菜单项）选择绘制矩形或者圆形；

2、 绘制过程中要求实现橡皮线功能和重画（窗口改变的时候，已绘制的图形不能消失）；

3、 程序中只能使用SetPixel绘图函数，不能使用其它绘图函数；

4、 [本功能选作]通过单击工具条按钮（或菜单项）显示对话框，让用户可以设置绘制图形的颜色（可以分别输入RGB三颜色分量）-Write applications that can use the mouse to draw rectangles and circles, the specific function requirements are as follows: 1, 2, the drawing process by click on the toolbar (or menu item) choose to draw a rectangle or circle　requirements of the function and weight of rubber line painting (window changes, draw graphics, can not disappear)　3, the program can only use the the SetPixel drawing function, you can not use other drawing functions　4 This feature is selected as] by click on the toolbar (or menu item ) shows the dialog box, so that the user can set the color to draw graphics (you can enter the three RGB color components)