Chapter 2 Graphics Tutorial
2-6
Figure 2. 4. Result of Draw Commands: Lines in Angles
The first two lines of this command sequence initiates the PRESCRIBE mode, resets
printing system defaults to permanent settings, and sets the line width to 0.01 inches.
Then the MZP command on line 3 moves the cursor to a point 5 inches to the right of the
left edge limit and 4 inches below the top edge limit.
Next, DRPA 2, 149; on line 4 draws a line two inches long at an angle of 149 degrees.
The angle is measured clockwise from the vertical axis. The subsequent DRPA com-
mands draw additional 2-inch lines at angles that increase in increments of 72 degrees.
As indicated by the CMNT (CoMmeNT) commands, angles that exceed 360 degrees are
equivalent to the remainder of division of the angle by 360.
Drawing Boxes and Circles
PRESCRIBE provides two commands especially for drawing boxes (BOX command)
and circles (CIR command).
Drawing Boxes
The BOX (draw box) command draws a box of a specified width and height. As with the
line drawing commands, the thickness of the line used to draw the box is determined by
the SPD (set pen diameter) command.
The following command sequence draws a box.
!R! RES;
UNIT C;
SPD 0.1;
MZP 3, 3;
BOX 3, 4;
PAGE;
EXIT;
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