Commodore PET User Manual page 239

We will use the square shown above as the basic graphie design to illustrate
elementary graphies. Though simple in its design, sketching this square involves
the major techniques used in graphie drawing on the PET.
Drawing a square on the PET is more complex than it may first appear. The
eight graphie keys and three cursor movements which are used to draw the four
thin lines and four corners of the square are shaded in the diagram below:
Draw the Square
There are nine steps to drawing the seven-space square discussed above.
L et us now draw the square, step by step.
Step 1:
HOME
the cursor. The top left corner of the HOME position space
should be the top left corner of the square (F igure 5-3a).
Step 2: Type the upper left corner of the square. This is done by using the
TOP LEFT CORNER 0 (Figure 5-3b).
Step 3: Draw the top line of the square Because we will use a COR NE R
key for the top right corner, type five TOP LI N E H OR IZONT AL
0
in this
step (Figure 5-3cl.
Step 4: Type the upper right corner of the square using the TOP R IG HT
COR NE R 0 (F igure 5-3d).
Step 5: Draw the vertical right side of the square. T
0
allow space for the
CORNER key, type five RIGHT L1NE VERTICAL
0 .
We ail know what this part of the square should look like, but does your
screen look like this instead?
111111
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