forgot to commit everything...

user/RainbowBeat.h

@@ -0,0 +1,72 @@
+#ifndef RAINBOWBEAT_H
+#define RAINBOWBEAT_H
+
+
+#include "ESP8266lib/ext/led/WS2812B.h"
+
+/**
+ * show rainbow colors using HUE
+ * use only 25% percent brightness
+ * when there is a beat, switch to 100% brightness
+ * and fade back to 25% again
+ */
+class RainbowBeat {
+
+    int p1 = 255;
+    int p2 = 63;
+    int fadeOut_ticks = 0;
+    int ticksLeft = 0;
+    uint8_t hue = 0;
+
+public:
+
+    /** ctor */
+    RainbowBeat() {
+        ;
+    }
+
+    /** configure the amounts for idle and beat */
+    void setAmounts(int p1, int p2) {
+        this->p1 = p1;
+        this->p2 = p2;
+    }
+
+    /** show a bight beat for x ticks */
+    void flash(const int duration_ticks) {
+        this->fadeOut_ticks = duration_ticks;
+        this->ticksLeft = duration_ticks;
+    }
+
+    /** show a beat by shifting the hue color */
+    void shift(const int val) {
+        hue += val;
+    }
+
+    /** shift to the given absolute hue */
+    void shiftTo(const int valAbs) {
+        hue = valAbs;
+    }
+
+    /** set hue back to 0 */
+    void restart() {
+        this->hue = 0;
+    }
+
+    /** called from the main */
+    void update() {
+        if (ticksLeft > 0) {--ticksLeft;}	// fade-out
+        hue += 1;
+    }
+
+    /** called from the main */
+    Color getCurrent() const {
+        const int percent = (ticksLeft * 100 / fadeOut_ticks);
+        const int val = ((p1 * percent) + (p2 * (100-percent))) / 100;
+        Color c; c.setHSV(hue, 255, val);
+        return c;
+    }
+
+};
+
+
+#endif // RAINBOWBEAT_H