First stab at a december display

harrogate/Cargo.toml

@@ -13,6 +13,8 @@ debug = true
 
 replace-default = []
 
+december-2019 = ["replace-default"]
+
 [dependencies]
 house = { path = "../house" }
 itsybitsy_m0 = "0.5"

harrogate/src/december_2019.rs

@@ -0,0 +1,63 @@
+use super::delay;
+use house::Harrogate;
+use lights::rgb::{blend, blend_steps, linear_gradient, Rgb};
+use lights::{HardwareRgb, Lights};
+
+const OFF: Rgb = Rgb(0, 0, 0);
+const CYAN: Rgb = Rgb(0, 128, 200);
+const BLUE: Rgb = Rgb(0, 0, 200);
+const PURPLE: Rgb = Rgb(128, 0, 128);
+const WHITE: Rgb = Rgb(255, 255, 255);
+
+const PULSE_LEN: usize = 50;
+const SEGMENT_LEN: usize = 20;
+const ZOOM: usize = 10;
+const ZOOM_SEGMENT_LEN: usize = SEGMENT_LEN * ZOOM + ZOOM;
+
+const HALF_PORCH: usize = 75;
+const FULL_PORCH: usize = 150;
+
+#[allow(dead_code)]
+#[inline(always)]
+pub fn run(lights: &mut impl Lights<Pixel = HardwareRgb>) -> ! {
+    let mut color_pulse = linear_gradient(CYAN, BLUE, PULSE_LEN)
+        .chain(linear_gradient(BLUE, PURPLE, PULSE_LEN))
+        .chain(linear_gradient(PURPLE, CYAN, PULSE_LEN))
+        .cycle();
+
+    let mut t = 0;
+
+    loop {
+        // advance "time" for pattern
+        t += 1;
+        if t > ZOOM_SEGMENT_LEN {
+            t = 0;
+        }
+        let color = color_pulse.next().unwrap_or(Rgb(255, 0, 0));
+
+        let half_pattern_func = |i| {
+            let x = (i * ZOOM) + t;
+            let x = x % ZOOM_SEGMENT_LEN;
+            match x {
+                x if x > SEGMENT_LEN * ZOOM => {
+                    blend_steps(WHITE, OFF, ZOOM, x - SEGMENT_LEN * ZOOM)
+                }
+                x => blend_steps(OFF, WHITE, SEGMENT_LEN * ZOOM, x),
+            }
+        };
+        let pattern_func = |i| match i {
+            i if i < HALF_PORCH => half_pattern_func(i),
+            i => half_pattern_func(FULL_PORCH - i),
+        };
+
+        Harrogate {
+            porch_back: (0..FULL_PORCH).map(pattern_func),
+            porch_front: (0..FULL_PORCH)
+                .map(pattern_func)
+                .map(|b| blend(color, WHITE, b)),
+        }
+        .render_to(lights);
+
+        delay(48_000_000);
+    }
+}

harrogate/src/door_light.rs

@@ -12,6 +12,7 @@ const ON: Rgb = Rgb(255, 255, 255);
  * 85 OFF + 65 door = 150 dots
  */
 
+#[allow(dead_code)]
 #[inline(always)]
 pub fn run(lights: &mut impl Lights<Pixel = HardwareRgb>) -> ! {
     let door_highlight = linear_gradient(OFF, ON, 20)

harrogate/src/main.rs

@@ -5,12 +5,16 @@ use lights_hal::{boot, entry};
 
 pub use lights_hal::delay;
 
+mod december_2019;
 mod door_light;
 
 #[entry]
 fn main() -> ! {
     let mut lights = boot();
 
+    #[cfg(feature = "december-2019")]
+    december_2019::run(&mut lights);
+
     #[cfg(not(feature = "replace-default"))]
     door_light::run(&mut lights);
 }