Next: PENCIL /WEIGHT
Up: PENCIL
Previous: PENCIL
Contents
Index
PENCIL /COLOUR
PENCIL [N] /COLOUR Arg
Modify the current pen color, or the color of the N-th pen.
The argument can be a color name (subset of the X11 colors catalog),
e.g. RED, LIGHT_SEA_GREEN, MEDIUM_BLUE... The complete list is available
by typing "PENCIL /COLOUR ?". The colors can also be displayed thanks to
the demonstration procedure "@ gag_demo:demo-pencolors.greg". The list
is also available in the character array GTV%COLORS for use in proce-
dures.
There are 3 special color names:
BACKGROUND resolves as WHITE on white devices and BLACK on black de-
vices,
FOREGROUND resolves as BLACK on white devices and WHITE on black de-
vices,
NEGATIVE inverts the pixel colors below the graphical segment begin
drawn. This ensures that the segment is always visible,
whatever the context. NEGATIVE is supported only for X and
PNG devices. Other devices use the FOREGROUND color as a
fallback.
The argument can also be an integer value (explicit, or a variable name,
or the result of a math expression) from -1 to 23 with the following
signification:
-1 NEGATIVE
0 FOREGROUND
1 RED
2 GREEN
3 BLUE
4 CYAN
5 YELLOW
6 MAGENTA
7 BACKGROUND
8 to 23: those 16 colors can be customized by the user (see HELP LUT
/PEN for details). They can be used as any other color, but they
also correspond as the "fill pens" used by the command RGMAP /GREY.
Those colors are dynamic, i.e., by default, changing them will also
modify the segments previously drawn with them (see HELP CHANGE
LUT).
Gildas manager
2021-01-19