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-rw-r--r--info/drawing-with-metapost/src/torn-edge.mp7
1 files changed, 7 insertions, 0 deletions
diff --git a/info/drawing-with-metapost/src/torn-edge.mp b/info/drawing-with-metapost/src/torn-edge.mp
new file mode 100644
index 0000000000..5d0afface0
--- /dev/null
+++ b/info/drawing-with-metapost/src/torn-edge.mp
@@ -0,0 +1,7 @@
+vardef signr suffix $ =
+ if $<0: - else: + fi uniformdeviate 1
+ enddef;
+vardef walkr suffix $ =
+ $ := $ if uniformdeviate 1 < (2**-abs($)): + else: - fi signr $;
+ $
+ enddef;