Introduction - If you have any usage issues, please Google them yourself
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)