GWBASIC User's Manual

GW-BASIC User's Guide
SCREEN 1 In mode 1, the COLOR statement has a unique syntax that includes a palette
argument, which is an odd or even integer expression. This argument determines
the set of display colors to use when displaying particular color numbers.
For hardware configurations that do not have an IBM® Enhanced Graphics
Adapter (EGA), the default color settings for the palette parameter are equivalent
to the following:
COLOR ,0 'Same as the next three PALETTE statements
'1 = green, 2 = red, 3 = yellow
COLOR ,1 'Same as the next three PALETTE statements
'1 = cyan, 2 = magenta, 3 = white
With the EGA, the default color settings for the palette parameter are equivalent
to the following:
COLOR ,0 'Same as the next three PALETTE statements
PALETTE 1,2 'Attribute 1 = color 3 (green)
PALETTE 2,4 'Attribute 2 = color 5 (red)
PALETTE 3,6 'Attribute 3 = color 6 (brown)
COLOR ,1 'Same as the next three PALETTE statements
PALETTE 1,3 'Attribute 1 = color 3 (cyan)
PALETTE 2,5 'Attribute 2 = color 5 (magenta)
PALETTE 3,7 'Attribute 3 = color 15 (white)
Note that a COLOR statement will override previous PALETTE statements.
SCREEN 2 No effect. An "Illegal function call" error message occurs if COLOR is
used in this mode.
SCREEN 7- In these modes, no border color can be specified. The graphics background is
SCREEN 10 given by the background color number, which must be in the valid range of
color numbers appropriate to the screen mode. See the SCREEN statement
reference pages for more details. The foreground color argument is the default
line drawing color.
Arguments outside valid numeric ranges result in "Illegal function call" errors.
The foreground color may be the same as the background color, making displayed characters
invisible. The default background color is black, or color number 0, for all display hardware
configurations and all screen modes.
With the Enhanced Graphics Adapter (EGA) installed, the PALETTE statement gives you
flexibility in assigning different display colors to the actual color-number ranges for the
foreground, background, and border colors discussed above. See the PALETTE statement
reference pages for more details.
file:///C|/Documents%20and%20Settings/Lorenzo/Desktop/GW%20Basic/COLOR.html (2 of 3)28/03/2004 21.29.16