Make a simple twinkle.

harrogate/src/december_21_2019.rs

@@ -1,5 +1,6 @@
 //! Golden background with twinkling lights
 use super::delay;
+use core::convert::TryInto;
 use house::Harrogate;
 use lights::rgb::Rgb;
 use lights::{HardwareRgb, Lights, murmurf};
@@ -16,23 +17,35 @@ const FULL_PORCH: usize = 150;
 #[derive(Copy, Clone)]
 struct Pixel {
     color: Rgb,
+    delay: u16
 }
 
 impl Pixel {
     const fn new() -> Pixel {
         Pixel {
-            color: GOLD
+            color: GOLD,
+            delay: 0,
         }
     }
 
-    fn tick(&mut self, mut rng: u32) {
+    fn tick(&mut self, rng: &mut u32) {
-        self.color = match murmurf(&mut rng) % 8 {
+        if self.delay > 0 {
+            self.delay -= 1;
+        } else {
+            self.color = match murmurf(rng) % 16 {
                 0..=1 => RED,
                 2..=3 => GREEN,
                 4..=5 => BLUE,
                 6 => PURPLE,
                 7 => WHITE,
                 _ => GOLD,
+            };
+
+            self.delay = if self.color == GOLD {
+                (murmurf(rng) % 600 + 300).try_into().unwrap_or(1000)
+            } else {
+                (murmurf(rng) % 100 + 50).try_into().unwrap_or(0)
+            }
         }
     }
 }
@@ -44,11 +57,10 @@ pub fn run(lights: &mut impl Lights<Pixel = HardwareRgb>) -> ! {
     let mut rng = 1;
     let mut pixels = [Pixel::new(); FULL_PORCH];
 
-    for pixel in pixels.iter_mut() {
-        pixel.tick(murmurf(&mut rng));
-    }
-
     loop {
+        for pixel in pixels.iter_mut() {
+            pixel.tick(&mut rng);
+        }
 
         Harrogate {
             porch_back: (0..FULL_PORCH).map(|_| GOLD),
@@ -56,6 +68,6 @@ pub fn run(lights: &mut impl Lights<Pixel = HardwareRgb>) -> ! {
         }
         .render_to(lights);
 
-        delay(300_000);
+        delay(5_000_000 / 60);
     }
 }