Commodore 128D - Page 292

intend to PAINT, and the source of the starting pixel coordinate and
the specified color source must be different. The Commodore 128
will only PAINT where the specified source in the PAINT statement is
different than the source of the x and y pixel coordinate. It cannot
PAINT points where the sources are the same in the PAINT state
ment and the pixel coordinate.
The x and y values can place the pixel cursor at absolute coordi
nates such as (100,100) or at coordinates relative to previous posi
tion (+ / - x and + / - y) of the pixel cursor such as (+ 20, - 10). The
coordinate of one axis is (x or y) can be relative and the other can be
absolute. Here are the posible combinations of ways to specify the
x and y coordinates:
x,y
±x,y
x,±y
±x,±y
absolute x, absolute y
relative x, absolute y
absolute x, relative y
relative x, relative y
Also see the LOCATE command for information on the pixel cursor.
The graphics commands DRAW, BOX, CIRCLE, PAINT, LOCATE AND
GSHAPE have an additional notation which allows you to specify a distance
and an angle relative to the previous coordinates of the pixel cursor (PC).
The notation is as follows:
KEYWORD
where:
KEYWORD
SOURCE
DISTANCE
ANGLE
source, distance; angle
is a graphics command such as DRAW,
CIRCLE, PAINT, LOCATE, BOX or GSHAPE
is the same code as in all of the graphics
commands
is the number of pixels to move the pixel
cursor
is the number of degrees to move relative to
the previous pixel cursor coordinate
EXAMPLE:
10 CIRCLE 1,160,100,65,50 Draws an outline of a circle.
20 PAINT 1,160,100
Fills in the circle with color from
source 1 (VIC foreground), assuming
point 160,100 is colored in the
background color (source 0).
G
U
U"
284 BASIC 7.0 ENCYCLOPEDIA-Basic Commands and Statements