PRESCRIBE Command Reference
182
PARC — in Path, draw ARC
Format
PARC x-coordinate, y-coordinate, radius, start-angle,
end-angle;
Parameters
x-coordinate, y-coordinate:
coordinates of the center of arc, measured from the left and top edge limits
radius:
radius of arc
start-angle:
starting angle, measured counterclockwise from the positive x axis
end-angle:
ending angle, measured counterclockwise from the positive x axis
Function
This command first of all adds a line extending from the current position to the
beginning of the arc, then adds an arc to the current path. Coordinates and radius are
measured in the units designated by the UNIT command; the starting and ending angles
are measured counterclockwise from the positive x axis.
To draw a simple arc as specified by the parameters, the cursor must be moved to the
beginning of the arc by using the PMRA command. (See the example below.)
The arc is drawn at the starting angle through the ending angle in counterclockwise
direction only. After the path is stroked, the cursor remains at the ending angle of the arc.
File
!R! RES; UNIT C;
NEWP; SPD .1;
PMZP 5.0, 10.0;
PARC 6.5, 12.5, 1.5, 180, 270;
STRK;
NEWP;
CMNT This program draws a circle;
PMRA 6.5, 18, 1.5, 0;
CMNT Moves cursor 1.5 cm by 0 degree;
PARC 6.5, 18, 1.5, 0, 360;
STRK;
PAGE; EXIT;
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