Print 16 covers on a page.

- cvr.py (main): moved previous main code to a function
- cvr.py: generate cover repeatedly and distribute it on the page

cvr.py

@@ -159,10 +159,13 @@ def rect_outline(x0, y0, z0, x1, y1, z1):
 # ----- Main ------------------------------------------------------------------
 
 
-if __name__ == "__main__":
+def main():
+    global do
+
+    if __name__ == "__main__":
 	do = outline_gnuplot
 	sk = None
-else:
+    else:
 	import HeeksPython as cad
 
 	do = outline_cad
@@ -170,15 +173,27 @@ else:
 	sk = cad.getlastobj()
 
 
-outline(sk)
-label(sk)
+    outline(sk)
+    label(sk)
 
-shape.rect = rect_outline
-shape.make_base()
+    shape.rect = rect_outline
+    shape.make_base()
 
-if __name__ == "__main__":
+    if __name__ == "__main__":
 	for e in lines:
 	    gnuplot_line(*e)
-else:
+    else:
 	for e in lines:
 	    cad_line(sk, *e)
+	cad.translate(sk, -13, -44, 0)
+
+    return sk
+
+
+if __name__ == "__main__":
+    main()
+else:
+    for x in (-100, 0):
+	for y in range(0, 256, 32):
+	    sk = main()
+	    cad.translate(sk, x, y-150, 0)