Commodore 128D - Page 287

LOOP
MONITOR
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
EXAMPLE:
LOCATE 160,100
LOCATE +20,100
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
Positions the PC in the center of the bit map
screen. Nothing will be seen until something
is drawn.
Move the pixel cursor 20 pixels to the right of
the last PC position and place it at Y
coordinate 100.
LOCATE - 30, + 20 Move the PC 30 pixels to the left and 20
down from the previous PC position.
The PC can be found by using the RDOT(0) function to get the X-
coordinate and RDOT(1) to get the Y-coordinate. The color source of
the dot at the PC can be found by PRIN.Ting RDOT(2).
See DO/LOOP
—Enter the Commodore 128 machine language monitor
MONITOR
See Appendix J for details on the Commodore 128 Machine Lan
guage Monitor.
279
BASIC 7.0 ENCYCLOPEDIA—Basic Commands and Statements