Description: Graph drawing, how to use custom brush (color, line width, linear). How to set up the dialog box for adding options and options to the program, how to use the standard color dialog box, how to use the font dialog box, and the preview function in the options dialog box. Implementation options dialog box and data exchange in the window class. How to change the background color of the dialog box and control, how to change the text color of the control, the special handling of the button control. How to display a bitmap in the window.
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