draw outline

envelope.asy

@@ -109,3 +109,10 @@ draw(cl1 -- corners[2] -- cl2);
 draw(cr1 -- corners[0] -- cr2);
 draw(cb1 -- corners[3] -- cb2);
 draw(ct1 -- corners[1] -- ct2);
+
+// Draw the outline of the whole template. This is handy when not printing on
+// the correctly sized paper. We are lazy and draw it piecewise.
+draw(cb2 -- cl2);
+draw(cl1 -- (0, sqsz) -- ct2);
+draw(ct1 -- cr1);
+draw(cr2 -- (sqsz, 0) -- cb1);