Commodore 128D - Page 315

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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
EXAMPLES:
SSHAPE A$,10,10
SSHAPE B$,20,30,47,51
SSHAPE D$, +10, + 10
GSHAPE A$,120,20
GSHAPE B$,30,30,1
GSHAPE C$, +20, + 30
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
Saves a rectangular area from the
coordinates 10,10 to the location of the
pixel cursor, into string variable A$.
Saves a rectangular area from top left
coordinate (20,30) through bottom right
coordinate (47,51) into string variable
Saves a rectangular area 10 pixels to
the right and 10 pixels down from the
current position of the pixel cursor.
Retrieves shape contained in string
variable A$ and displays it at top left
coordinate (120,20).
Retrieves shape contained in string
variable B$ and displays it at top left
coordinate 30,30. The shape is inverted
due to the replacement mode being
selected by the 1.
Retrieve shape from string variable C$
and displays it 20 pixels to the right and
30 pixels down from the current position
of the pixel cursor.
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NOTE: Beware using modes 1-4 with multicolor shapes. You may
obtain unpredictable results.
BASIC 7.0 ENCYCLOPEDIA—Basic Commands and Statements