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<h2>8. More About Direction Changes
<a name="8. More About Direction Changes"></a>
</h2>



<p style="margin-top: 1em"><font color="#000000">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:</font></p>


<p align="center" style="margin-top: 1em"><font color="#000000"><img src="img/pic26.png" alt="Image img/pic26.png"></font></p>


<p align="center" style="margin-top: 1em"><font color="#000000">Figure
8-1: Effects of different motion directions (right and
left)</font></p>


<p align="center" style="margin-top: 1em"><font color="#000000"><img src="img/pic27.png" alt="Image img/pic27.png"></font></p>


<p align="center" style="margin-top: 1em"><font color="#000000">Figure
8-2: Effects of different motion directions (up and
down)</font></p>

<p style="margin-top: 1em"><font color="#000000">Something
that may appear surprising happens if you change directions
in the obvious way:</font></p>


<p align="center" style="margin-top: 1em"><font color="#000000"><img src="img/pic28.png" alt="Image img/pic28.png"></font></p>


<p align="center" style="margin-top: 1em"><font color="#000000">Figure
8-3: <b>box; arrow; circle; down; arrow;
ellipse</b></font></p>

<p style="margin-top: 1em"><font color="#000000">You might
have expected that program to yield this:</font></p>


<p align="center" style="margin-top: 1em"><font color="#000000"><img src="img/pic29.png" alt="Image img/pic29.png"></font></p>


<p align="center" style="margin-top: 1em"><font color="#000000">Figure
8-4: More intuitive?</font></p>

<p style="margin-top: 1em"><font color="#000000">But, in
fact, to get Figure 8.3 you have to do this:</font></p>

<pre style="margin-left:10%; margin-top: 1em">.PS
box;
arrow;
circle;
move to last circle .s;
down;
arrow;
ellipse
.PE</pre>


<p style="margin-top: 1em"><font color="#000000">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.</font></p>

<p style="margin-top: 1em"><font color="#000000">The
meaning of the command <b>move to last circle .s</b> 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.</font></p>
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