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Code Editor : pic-8.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
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<h2>8. More About Direction Changes
<a name="8. More About Direction Changes"></a>
</h2>

We&rsquo;ve
already seen how to change the direction in which objects
are composed from rightwards to downwards. Here are some
more illustrative examples:

Figure
8-1: Effects of different motion directions (right and
left)

Figure
8-2: Effects of different motion directions (up and
down)

Something
that may appear surprising happens if you change directions
in the obvious way:

Figure
8-3: box; arrow; circle; down; arrow;
ellipse

You might
have expected that program to yield this:

Figure
8-4: More intuitive?

But, in
fact, to get Figure 8.3 you have to do this:

.PS
 
box; 
arrow; 
circle; 
move to last circle .s; 
down; 
arrow; 
ellipse 
.PE

Why is
this? Because the exit point for the current direction is
already set when you draw the object. The second arrow in
Figure 8.2 dropped downwards from the circle&rsquo;s
attachment point for an object to be joined to the
right.

The
meaning of the command move to last circle .s should
be obvious. In order to see how it generalizes, we&rsquo;ll
need to go into detail on two important topics; locations
and object names.
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