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<h2>20. Some Larger Examples
<a name="20. Some Larger Examples"></a>
</h2>


<p style="margin-top: 1em"><font color="#000000">Here are a
few larger examples, with complete source code. One of our
earlier examples is generated in an instructive way using a
for loop:</font></p>

<pre style="margin-left:10%; margin-top: 1em">.PS
# Draw a demonstration up left arrow with grid box overlay
define gridarrow
{
    move right 0.1
    [
        {arrow up left $1;}
        box wid 0.5 ht 0.5 dotted with .nw at last arrow .end;
        for i = 2 to ($1 / 0.5) do
        {
            box wid 0.5 ht 0.5 dotted with .sw at last box .se;
        }
        move down from last arrow .center;
        [
            if ( $1 == boxht ) \
            then { &quot;\fBline up left\fP&quot; } \
            else { sprintf(&quot;\fBarrow up left %g\fP&quot;, $1) };
        ]
    ]
    move right 0.1 from last [] .e;
}
gridarrow(0.5);
gridarrow(1);
gridarrow(1.5);
gridarrow(2);
undef gridarrow
.PE</pre>



<p align="center" style="margin-top: 1em"><font color="#000000"><small><img src="img/pic48.png" alt="Image img/pic48.png"></small></font></p>


<p align="center" style="margin-top: 1em"><font color="#000000">Figure
20-1: Diagonal arrows (dotted boxes show the implied
0.5-inch grid)</font></p>


<p style="margin-top: 1em"><font color="#000000">Here&rsquo;s
an example concocted to demonstrate layout of a large,
multiple-part pattern:</font></p>
<pre style="margin-left:10%; margin-top: 1em">.PS
define filter {box ht 0.25 rad 0.125}
lineht = 0.25;
Top: [
    right;
    box &quot;\fBms\fR&quot; &quot;sources&quot;;
    move;
    box &quot;\fBHTML\fR&quot; &quot;sources&quot;;
    move;
    box &quot;\fBlinuxdoc-sgml\fP&quot; &quot;sources&quot; wid 1.5;
    move;
    box &quot;\fBTexinfo\fP&quot; &quot;sources&quot;;

    line down from 1st box .s lineht;
    A: line down;
    line down from 2nd box .s; filter &quot;\fBhtml2ms\fP&quot;;
    B: line down;
    line down from 3rd box .s; filter &quot;\fBformat\fP&quot;;
    C: line down;
    line down from 4th box .s; filter &quot;\fBtexi2roff\fP&quot;;
    D: line down;
]
move down 1 from last [] .s;
Anchor: box wid 1 ht 0.75 &quot;\fBms\fR&quot; &quot;intermediate&quot; &quot;form&quot;;
arrow from Top.A.end to Anchor.nw;
arrow from Top.B.end to 1/3 of the way between Anchor.nw and Anchor.ne;
arrow from Top.C.end to 2/3 of the way between Anchor.nw and Anchor.ne;
arrow from Top.D.end to Anchor.ne
{
    # PostScript column
    move to Anchor .sw;
    line down left then down -&gt;;
    filter &quot;\fBpic\fP&quot;;
    arrow;
    filter &quot;\fBeqn\fP&quot;;
    arrow;
    filter &quot;\fBtbl\fP&quot;;
    arrow;
    filter &quot;\fBgroff\fP&quot;;
    arrow;
    box &quot;PostScript&quot;;

    # HTML column
    move to Anchor .se;
    line down right then down -&gt;;
    A: filter dotted &quot;\fBpic2img\fP&quot;;
    arrow;
    B: filter dotted &quot;\fBeqn2html\fP&quot;;
    arrow;
    C: filter dotted &quot;\fBtbl2html\fP&quot;;
    arrow;
    filter &quot;\fBms2html\fP&quot;;
    arrow;
    box &quot;HTML&quot;;


    # Nonexistence caption
    box dashed wid 1 at B + (2,0) &quot;These tools&quot; &quot;don&rsquo;t yet exist&quot;;
    line chop 0 chop 0.1 dashed from last box .nw to A.e -&gt;;
    line chop 0 chop 0.1 dashed from last box .w  to B.e -&gt;;
    line chop 0 chop 0.1 dashed from last box .sw to C.e -&gt;;
}
.PE</pre>



<p align="center" style="margin-top: 1em"><font color="#000000"><small><img src="img/pic49.png" alt="Image img/pic49.png"></small></font></p>


<p align="center" style="margin-top: 1em"><font color="#000000">Figure
20-2: Hypothetical production flow for dual-mode
publishing</font></p>


<p align="center" style="margin-top: 1em"><font color="#000000"><img src="img/pic50.png" alt="Image img/pic50.png"></font></p>


<p align="center" style="margin-top: 1em"><font color="#000000">Figure
20-3: Three-dimensional Boxes</font></p>

<p style="margin-top: 1em"><font color="#000000">Here the
source code for figure 20-3:</font></p>
<pre style="margin-left:10%; margin-top: 1em">.PS
# a three-dimensional block
#
# tblock(&lt;width&gt;, &lt;height&gt;, &lt;text&gt;)

define tblock { [
  box ht $2 wid $1 \
      color &quot;gold&quot; outlined &quot;black&quot; \
      xslanted 0 yslanted 0 \
      $3;
  box ht .1 wid $1 \
      color &quot;yellow&quot; outlined &quot;black&quot; \
      xslanted .1 yslanted 0 \
      with .sw at last box .nw;
  box ht $2 wid .1 \
      color &quot;goldenrod&quot; outlined &quot;black&quot; \
      xslanted 0 yslanted .1 \
      with .nw at 2nd last box .ne;
] }


tblock(1, .5, &quot;Master&quot; &quot;1&quot;);
move -.1
tblock(.5, 1, &quot;Slave&quot;);
.PE</pre>
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