About Painting and Drawing - Win32 Programmer's Reference

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About Painting and Drawing

Nearly all applications use the screen to display the data they manipulate. An application paints images, draws figures, and writes text so that the user can view data as it is created, edited, and printed. Microsoft® Windows® provides a rich environment for painting and drawing, but, because Windows is a multitasking operating system, applications must cooperate with one another when accessing the screen.

To keep all applications functioning smoothly and cooperatively, Windows manages all output to the screen. Applications use windows as their primary output device rather than the screen itself. Windows supplies display DCs that uniquely correspond to the windows. Applications use display DCs to direct their output to the given windows. Drawing in a window (directing output to it) prevents an application from interfering with the output of other applications and allows applications to coexist with one another while still taking full advantage of the graphics capabilities of Windows.

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