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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>
<p style="margin-left:10%; margin-top: 1em"><font color="#000000"><small>.PS
<br>
# Draw a demonstration up left arrow with grid box overlay
<br>
define gridarrow <br>
{ <br>
move right 0.1 <br>
[ <br>
{arrow up left $1;} <br>
box wid 0.5 ht 0.5 dotted with .nw at last arrow .end; <br>
for i = 2 to ($1 / 0.5) do <br>
{ <br>
box wid 0.5 ht 0.5 dotted with .sw at last box .se; <br>
} <br>
move down from last arrow .center; <br>
[ <br>
sprintf("\fBarrow up left %g\fP", $1) <br>
] <br>
] <br>
move right 0.1 from last [] .e; <br>
} <br>
gridarrow(0.5); <br>
gridarrow(1); <br>
gridarrow(1.5); <br>
gridarrow(2); <br>
undef gridarrow <br>
.PE</small></font></p>
<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’s
an example concocted to demonstrate layout of a large,
multiple-part pattern:</font></p>
<p style="margin-left:10%; margin-top: 1em"><font color="#000000"><small>.PS
<br>
define filter {box ht 0.25 rad 0.125} <br>
lineht = 0.25; <br>
Top: [ <br>
right; <br>
box "\fBms\fR" "sources"; <br>
move; <br>
box "\fBHTML\fR" "sources"; <br>
move; <br>
box "\fBlinuxdoc-sgml\fP" "sources" wid
1.5; <br>
move; <br>
box "\fBTexinfo\fP"
"sources";</small></font></p>
<p style="margin-left:10%; margin-top: 1em"><font color="#000000"><small>line
down from 1st box .s lineht; <br>
A: line down; <br>
line down from 2nd box .s; filter "\fBhtml2ms\fP";
<br>
B: line down; <br>
line down from 3rd box .s; filter "\fBformat\fP";
<br>
C: line down; <br>
line down from 4th box .s; filter
"\fBtexi2roff\fP"; <br>
D: line down; <br>
] <br>
move down 1 from last [] .s; <br>
Anchor: box wid 1 ht 0.75 "\fBms\fR"
"intermediate" "form"; <br>
arrow from Top.A.end to Anchor.nw; <br>
arrow from Top.B.end to 1/3 of the way between Anchor.nw and
Anchor.ne; <br>
arrow from Top.C.end to 2/3 of the way between Anchor.nw and
Anchor.ne; <br>
arrow from Top.D.end to Anchor.ne <br>
{ <br>
# PostScript column <br>
move to Anchor .sw; <br>
line down left then down ->; <br>
filter "\fBpic\fP"; <br>
arrow; <br>
filter "\fBeqn\fP"; <br>
arrow; <br>
filter "\fBtbl\fP"; <br>
arrow; <br>
filter "\fBgroff\fP"; <br>
arrow; <br>
box "PostScript";</small></font></p>
<p style="margin-left:10%; margin-top: 1em"><font color="#000000"><small>#
HTML column <br>
move to Anchor .se; <br>
line down right then down ->; <br>
A: filter dotted "\fBpic2img\fP"; <br>
arrow; <br>
B: filter dotted "\fBeqn2html\fP"; <br>
arrow; <br>
C: filter dotted "\fBtbl2html\fP"; <br>
arrow; <br>
filter "\fBms2html\fP"; <br>
arrow; <br>
box "HTML";</small></font></p>
<p style="margin-left:10%; margin-top: 1em"><font color="#000000"><small>#
Nonexistence caption <br>
box dashed wid 1 at B + (2,0) "These tools"
"don’t yet exist"; <br>
line chop 0 chop 0.1 dashed from last box .nw to A.e ->;
<br>
line chop 0 chop 0.1 dashed from last box .w to B.e ->;
<br>
line chop 0 chop 0.1 dashed from last box .sw to C.e ->;
<br>
} <br>
.PE</small></font></p>
<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>
<p style="margin-left:10%; margin-top: 1em"><font color="#000000">.PS
<br>
# a three-dimensional block <br>
# <br>
# tblock(<width>, <height>,
<text>)</font></p>
<p style="margin-left:10%; margin-top: 1em"><font color="#000000">define
tblock { [ <br>
box ht $2 wid $1 \ <br>
color "gold" outlined "black" \ <br>
xslanted 0 yslanted 0 \ <br>
$3; <br>
box ht .1 wid $1 \ <br>
color "yellow" outlined "black" \ <br>
xslanted .1 yslanted 0 \ <br>
with .sw at last box .nw; <br>
box ht $2 wid .1 \ <br>
color "goldenrod" outlined "black" \
<br>
xslanted 0 yslanted .1 \ <br>
with .nw at 2nd last box .ne; <br>
] }</font></p>
<p style="margin-left:10%; margin-top: 1em"><font color="#000000">tblock(1,
.5, "Master" "1"); <br>
move -.1 <br>
tblock(.5, 1, "Slave"); <br>
.PE</font></p>
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