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72 lines
2.3 KiB
Plaintext
72 lines
2.3 KiB
Plaintext
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5.10. Color Manipulation
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Ncurses provides support for the use of color on terminals
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that are capable of display it. Note the BSD and older SYSV
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curses don't support color. Color support in the PC version
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is not compatible with SYSR4.
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has_colors()
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this function returns TRUE if the terminal supports color,
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FALSE otherwise. Other color handling funtions will return
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ERR if has_colors() is FALSE. You should always check before
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using color and use other video attributes to replace color.
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can_change_color()
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This function returns TRUE if the terminal is capable of
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redefining colors using the init_color function, FALSE if it
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can't. Don't use init_color and color_content if it returns
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FALSE.
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start_color()
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This function must be called before any other color handling
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function is called. It initializes the 8 basic colors (see
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appendix I) and sets the global variables COLORS and COLOR_
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PAIRS to the maximum number of colors and color-pairs a
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terminal can handle.
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init_pair(pair, fg, bg)
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This function changes the definition of a color-pair, pair.
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Each pair has a foregroung color fg, and a background color
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bg. Both values must be between 0 and COLORS-1. pair must be
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between 1 and COLOR_PAIRS-1.
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[If a pair is changed from a previous definition, the screen
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is refreshed and all occurances of the color-pair are
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changed to reflect the change.]
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pair_content(pair, f, b)
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This function stores the foreground and background colors of
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the color-pair pair into the variables pointed to by f, b.
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pair should be between 1 and COLOR_PAIRS-1.
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init_color(color, r, g, b)
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This function changes the value of a given color. A color is
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defined by its red, green, and blue components, r, g, and b.
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These values must be between 0 and 1000. color should be
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between 0 and COLORS-1.
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color_content(color, r, g, b)
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This function puts the red, green, and blue components of
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color into the variable pointed to by r, g, b respectively.
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color should be between 0 and COLORS-1.
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COLOR_PAIR(n) set color-pair to that stored in n
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PAIR_NUMBER(a) get color-pair stored in attribute a
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Appendix II: COLORS
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-------------------
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Colors are defined in <ncurses.h> are used with init_pair().
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COLOR_BLACK 0
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COLOR_RED 1
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COLOR_GREEN 2
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COLOR_YELLOW 3
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COLOR_BLUE 4
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COLOR_MAGENTA 5
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COLOR_CYAN 6
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COLOR_WHITE 7
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