Tandy 1000 Basic Reference Manual page 257

Chawter
10 I BASIC Kevwords
PALETTE USING/Graphics
Statement
PALETTE USING array(subscrippt)
Changes the colors associated with more than 1 of the color
numbers in the current palette.
Array
is the name of an integer array in which you define the
order in which colors are to be put in the current palette.
Subscript
is the array position that contains the value of the
color that you want put in the first palette position. After BASIC
assigns that value
to
the first position, it assigns the remaining
array values to the remaining palette positions. Therefore, when
you create the array, have at least 16 elements following
sub-
script
so that PALETTE USING has enough colors to fill the
palette.
The array can be larger than the palette. PALETTE USING
stops filling the current palette when it reaches the last position
in the palette.
To create the array, load a color number into each element.
Group color numbers that you use most often. For example, if you
use 2 shades of blue with 2 shades of green, place their color
numbers adjacent in the array, like this:
Subscript Color
0 2 (Green)
1 10 (Light Green)
2
1 (Blue)
3 9 (Light Blue)
In the statement:
P A L E T T E
U S I N G
A C 0 )
Color 0 becomes green, Color 1 becomes light green, Color 2 be-
comes blue, and Color 3 becomes light blue.
If you assign a value of -1 to a position in the array, PALETTE
USING does not change the corresponding color from its previous
value.
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