Apple IIe - Page 236

236 Apple lie Users Handbook
The arrows are called plotting vectors . These vectors must be
translated into their binary codes. The following table supplies ·
these
binary codes.
Draw vectors
100
t
up
101
-
right
110
! down
111
+-
left
Move vectors
000
t
up
001
-
right
010 ! down
011 left
An example of a move vector could be vector #2 from the square.
A
move vector plots nothing onto the screen. It merely moves
the starting position of the next vector. An example of a draw
vector could be vector #11 . A draw vector draws a line .
The easiest way
to accumulate the necessary binary information
is by using a table as shown on page 237.