src: implement simulation data sources

src/lib.rs

@@ -35,4 +35,30 @@ pub fn as_milliwatts(pixel: &Rgb<u8>) -> u32 {
     let blue = (pixel.b as u32 * BLUE_MW).wrapping_shr(8);
 
     red + green + blue + DARK_MW
+}
+
+
+#[derive(Debug)]
+pub struct CircularBuffer<T, const SIZE: usize = 20> {
+    pub data: [T; SIZE],
+    next_index: usize
+}
+
+impl<T: Default + Copy, const SIZE: usize> Default for CircularBuffer<T, SIZE> {
+    fn default() -> Self {
+        Self {
+            data: [Default::default(); SIZE],
+            next_index: 0
+        }
+    }
+}
+
+impl<T, const SIZE: usize> CircularBuffer<T, SIZE> {
+    pub fn insert(&mut self, value: T) {
+        self.data[self.next_index] = value;
+        self.next_index += 1;
+        if self.next_index == self.data.len() {
+            self.next_index = 0;
+        }
+    }
 }