| RGB |
| Description | This unit contains the predefined constants for the basic colors
and the subprograms to change the color palette. All subprograms in the RGB unit are exported qualified (and thus must be prefaced with "RGB."). All the color constants are exported unqualified and thus do not need the RGB prefix.
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| Details | For a program that displays the 256 predefined colors (and their
associated color numbers) in Turing, run the "Colors.t" program.
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| Details | The following names can be used for colors. They represent
color numbers and thus will not be accurate if RGB.SetColor
has been used to change color numbers 0 through 15. black, blue, green, cyan, red, magenta, purple, brown, white, gray, grey, brightblue, brightgreen, brightcyan, brightred, brightmagenta, brightpurple, yellow, brightwhite, darkgray, darkgrey The remaining four colors represent the foreground color (black on Windows or the Macintosh, white on a DOS system) and the background color (white on Windows or Macintosh, black on a DOS system). Using these four colors allows you to write programs that work on both Windows and DOS versions of Turing. colorfg, colourfg, colorbg, colourbg
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| Details | Turing uses a palette to access colors for display. This
palette is a list of color numbers and their associated actual color.
The Turing palette starts with 256 entries (the color numbers from 0
to 255). With 16, 24, and 32-bit color displays, however, a Turing
program can display thousands of colors at once. These colors,
however, will all have color numbers associated with them. For
example, if a Turing program loads a JPEG image, there may be
thousands of colors on the screen, but the number of color numbers
will stay at 256. Likewise, 16, 24, and 32-bit color displays, if
you load a picture in GIF format that has a 256 colors that are
different from the initial Turing color palette, they will appear
in the run window. However, they will not be added to Turing's
color palette. If you attempt to determine the color number of a particular pixel that does not match any of the colors in Turing's color palette, then Turing will return the color number of the color in the Turing palette that most closely matches that color of the pixel.
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| Entry Points |
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