From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Thu, 3 Dec 2020 16:38:49 +0000 (+0000)
Subject: tiling
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=bdc1e9544727307ab506439952ea074afb882182;p=quacks.git

tiling
---

diff --git a/pumpkin-books.ps.pl b/pumpkin-books.ps.pl
index dcfbfd9..7cb4cbb 100755
--- a/pumpkin-books.ps.pl
+++ b/pumpkin-books.ps.pl
@@ -174,6 +174,44 @@ END
   $o;
 }
 
+sub tile {
+  my $pos = 0;
+  my $o = '';
+  my $showpage = sub {
+    $o .= <<END;
+showpage
+END
+  };
+  while (my $d = shift @_) {
+    if ($pos >= 5) {
+      $pos -= 5;
+      $showpage->();
+    }
+    $o .= <<END;
+gsave
+END
+    if ($pos < 3) {
+      $o .= <<END
+        0   th 10 add  $pos mul  translate
+END
+    } else {
+      $o .= <<END
+tw 2 mul 7 add
+   dup    th add  0 translate
+   90 rotate
+   $pos 3 sub mul  0 translate
+END
+    }
+    $o .= "\n".$d."\n";
+    $o .= <<END;
+grestore
+END
+    $pos++;
+  }
+  $showpage->();
+  $o;
+}
+
 print <<END or die $!;
 %!
 
@@ -196,25 +234,12 @@ print <<END or die $!;
 /costfont /Heletica-BoldOblique findfont costtextsz scalefont def
 
 /rubysz 4 def
-
-gsave
-END
-
-print green_book() or die $!;
-
-print <<END,green_book() or die $!;
-grestore
-gsave
-tw 2 mul th add 7 add 0 translate
-90 rotate
 END
 
-print <<END,green_book() or die $!;
-grestore
-gsave
-0   th 10 add  2 mul  translate
-END
-
-print <<END or die $!;
-grestore
-END
+print tile(
+	   green_book(),
+	   green_book(),
+	   green_book(),
+	   green_book(),
+	   green_book(),
+	  ) or die $! if 1;