From eb7ac1c1f1aacbade192ea5a3f5c0ccaa8bc4e95 Mon Sep 17 00:00:00 2001
From: Juergen Stuber <juergen@jstuber.net>
Date: Fri, 28 Dec 2018 14:47:58 +0100
Subject: [PATCH] Set some pixels to black in colored noise.

---
 src/bin/cnoise/main.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/bin/cnoise/main.rs b/src/bin/cnoise/main.rs
index a3e3287..8a0a1f5 100644
--- a/src/bin/cnoise/main.rs
+++ b/src/bin/cnoise/main.rs
@@ -43,7 +43,13 @@ fn main() -> std::io::Result<()> {
     loop {
         let x = rng.gen_range(0, x_size);
         let y = rng.gen_range(0, y_size);
-        let c = c0.interpolate(c1, rng.gen::<f64>().powf(2.0));
+        let c = {
+            if rng.gen::<f64>() < 0.5 {
+                c0.interpolate(c1, rng.gen::<f64>().powf(2.0))
+            } else {
+                Color::black()
+            }
+        };
         frame[y][x] = c;
 
         let mut buf = Vec::with_capacity(x_size * y_size * 3);