Path Mode Graphics
2-25
Figure 2. 22. Printout of the PARC Example
After the arc is drawn, the cursor is located at the end of the arc.
If you wish to eliminate the straight line segment in the above example, leaving only the
arc, the cursor position must be moved in advance to the position at which drawing of the
arc begins. This is shown in the following example, in which the cursor is moved to the
coordinates as specified by the PMRA (Path, Move to Relative position specified by
Angle) command prior to drawing the arc.
!R! RES UNIT C; NEWP; SPD .1;
PMRA 5, 5, 3, 45;
PARC 5, 5, 3, 45, 135;
STRK;
PAGE;
EXIT;
In this current example, the PMRA command moves the cursor from coordinates 5, 5, as
measured from the left and top edge limits of the page, through the distance of 3 centi-
meters at the angle of 45 degrees from the positive x axis. At this point, the PARC com-
mand starts to draw the arc which ends at the angle of 135 degrees.
Figure 2. 23. Printout of the PMRA Example
Circles can be constructed by drawing arcs with angular extents of 360 degrees. To draw
a circle, you will also need a PMRA command to eliminate the line extending from the
center of the circle to the beginning of the circle. See the following example:
!R! RES; UNIT C; NEWP; SPD .1;
PMRA 3, 3, 1.5, 0;
PARC 3, 3, 1.5, 0, 360;
STRK;
PAGE;
EXIT;
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