In the process of drawing】 【Add a menu item, a submenu in the square have 【】, 【oval】, 【triangle】, 【】 and other menu options parallelogram. Select a menu item in the application window, the user area to draw the corresponding graph, and remove the original graphics. 2, read the VC++ help documentation for a name for StretchBlt function, the function with the BitBlt function is the same as can be in memory bitmap appears in the display screen, but it BitBlt different places that can put a bitmap drawing in or out. Please use this function to prepare a bitmap can zoom in or out of the application.

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