Introduction - If you have any usage issues, please Google them yourself
Graphics rendering, and how to use a custom brush (color, line width, line). How to add the options menu and option settings dialog box for the program, and how to use the standard color dialog, how to use the Font dialog box, the preview function in the Options dialog box. Data exchange in the Options dialog box and 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 treatment of the button control. How to display a bitmap in a window.