Color Constants in GRAPH.H Used Only By Certain Functions

MS-DOS                      | WINDOWS

The information in this article applies to:

• The C Run-time (CRT), included with:

      - Microsoft C for MS-DOS, versions 5.1, 6.0, 6.0a, and 6.0ax
      - Microsoft C/C++ for MS-DOS, version 7.0
      - Microsoft Visual C++ for Windows, version 1.0
  

The predefined color constants found in GRAPH.H are used only by the functions _remapallpalette(), _remappalette(), and _setbkcolor(). These functions expect long integer values for colors. Examples of these constants are _BLUE, _GREEN, _RED, and so on. They will not work with the _setcolor() and _settextcolor() functions, which expect short integer values. Also, these constants will not work with _setbkcolor() if the present video mode is a text mode.

These two systems of specifying colors are not interchangeable. In graphics modes, values passed to _setcolor() and _settextcolor() are index values into the color palette. The values in the color palette are set with the _remapallpalette() and _remappalette() functions. The _setbkcolor() function is a special case of _remappalette(), which is used to set the color for palette index zero.