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