Microsoft KB Archive/74793

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HOWTO: Simulating CreatePatternBrush on a High-Res Printer

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Q74793

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1
 * Microsoft Win32 Application Programming Interface (API)

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SUMMARY
When a pattern brush is used to fill an area of the page on the printer, the printer's high resolution will cause a fine pattern to lose definition and appear as a shade of gray.

Brushes that are created with the CreatePatternBrush function are eight pixels by eight pixels (8 x 8 pixels) in size. On a 300 dots-per-inch (dpi) laser printer, the pattern will be 0.027 inches wide.

To create a pattern that gives similar effects on the screen as on the printer, it is necessary to compare the screen resolution to the printer resolution, and to compensate for the differences.

For example, if the video display is 100 dpi (typical of a VGA), and the printer is 300 dpi (a typical laser printer), the bit must be three times larger in each direction. The following compares a screen bitmap and a printer bitmap:

  10101010          111000111000111000111000 01010101         111000111000111000111000   10101010          111000111000111000111000   01010101          000111000111000111000111   10101010          000111000111000111000111     and so forth 01010101         000111000111000111000111   10101010          111000111000111000111000   01010101          111000111000111000111000                     111000111000111000111000    Video            000111000111000111000111 000111000111000111000111                    000111000111000111000111                     111000111000111000111000                     111000111000111000111000                     111000111000111000111000                     000111000111000111000111                     000111000111000111000111                     000111000111000111000111                     111000111000111000111000                     111000111000111000111000                     111000111000111000111000                             Printer However, since the pattern brush is always 8 x 8 pixels, a different approach must be used when printing:


 * 1) Use the StretchBlt function to create, from the video bitmap, the 24 x 24 pixel bitmap for the printer.
 * 2) Manually &quot;tile&quot; this bitmap into the region to be painted.

Additional query words: 3.00 3.10 4.00 win16sdk

Keywords : kbOSWin95 _IK kbSDKWin16

Issue type : kbhowto

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWin32sSearch kbWin32API kbWinSDKSearch kbWinSDK310