Add sunrise mode

[kaka/cakelight.git] / src / kaka / cakelight / mode / SunriseMode.java

diff --git a/src/kaka/cakelight/mode/SunriseMode.java b/src/kaka/cakelight/mode/SunriseMode.java
new file mode 100644 (file)
index 0000000..896646f
--- /dev/null
+++ b/src/kaka/cakelight/mode/SunriseMode.java
@@ -0,0 +1,36 @@
+package kaka.cakelight.mode;
+
+import kaka.cakelight.Color;
+import kaka.cakelight.LedFrame;
+
+public class SunriseMode extends AmbientMode {
+    private int durationSeconds;
+
+    public SunriseMode(int durationSeconds) {
+        this.durationSeconds = durationSeconds;
+    }
+
+    @Override
+    protected void updateFrame(LedFrame frame, long time, int count) {
+        double progress = clamp(time / (durationSeconds * 1000.0));
+        double elevation = 2.0 - progress;
+        double radius = progress * 2.12;
+        for (int i = 0; i < config.leds.getCount(); i++) {
+            double x = frame.xOf(i);
+            double y = frame.yOf(i);
+            double distance = distanceFromSun(x, y, elevation);
+            double r = clamp(1.0 - distance + radius);
+            double g = clamp(0.5 - distance + radius);
+            double b = clamp(0.0 - distance + radius);
+            frame.setLedColor(i, Color.rgb(r, g, b));
+        }
+    }
+
+    private double clamp(double value) {
+        return Math.min(Math.max(value, 0), 1.0);
+    }
+
+    private double distanceFromSun(double x, double y, double elevation) {
+        return Math.sqrt(Math.pow(0.5 - x, 2) + Math.pow(elevation - y, 2));
+    }
+}