Alexa swipe effect

espmusicmouse/lib/ledtl/helpers/BellCurve.h

@@ -1,3 +1,5 @@
+#pragma once
+
 #include <cstdint>
 
 static inline float bellCurveApproximation(float x, float inverseWidth)

espmusicmouse/lib/ledtl/helpers/ColorConversions.h

@@ -0,0 +1,114 @@
+#include "helpers/ColorHSV.h"
+#include "helpers/ColorRGBW.h"
+
+#include <cstdint>
+#include <cmath>
+#include <algorithm>
+
+// https://stackoverflow.com/questions/3018313/algorithm-to-convert-rgb-to-hsv-and-hsv-to-rgb-in-range-0-255-for-both
+inline ColorHSV rgb2hsv(const ColorRGBW &in)
+{
+  ColorHSV out;
+
+  const float r = (float)(in.r) / 255.0f;
+  const float g = (float)(in.g) / 255.0f;
+  const float b = (float)(in.b) / 255.0f;
+
+  const float min = std::min(r, std::min(g, b));
+  const float max = std::max(r, std::max(g, b));
+
+  out.v = max; // v
+  const float delta = max - min;
+  if (delta < 0.00001f)
+  {
+    out.s = 0;
+    out.h = 0; // undefined, maybe nan?
+    return out;
+  }
+  if (max > 0.0f)
+  {                        // NOTE: if Max is == 0, this divide would cause a crash
+    out.s = (delta / max); // s
+  }
+  else
+  {
+    // if max is 0, then r = g = b = 0
+    // s = 0, h is undefined
+    out.s = 0.0f;
+    out.h = 0.0f; //NAN; // its now undefined
+    return out;
+  }
+  if (r >= max)              // > is bogus, just keeps compilor happy
+    out.h = (g - b) / delta; // between yellow & magenta
+  else if (g >= max)
+    out.h = 2.0f + (b - r) / delta; // between cyan & yellow
+  else
+    out.h = 4.0f + (r - g) / delta; // between magenta & cyan
+
+  out.h *= 60.0f; // degrees
+
+  if (out.h < 0.0f)
+    out.h += 360.0f;
+
+  return out;
+}
+
+ColorRGBW hsv2rgb(const ColorHSV &in)
+{
+  int i;
+  ColorRGBW out;
+  out.w = 0;
+
+  if (in.s <= 0.0f)
+  { // < is bogus, just shuts up warnings
+    out.r = (uint8_t)(in.v * 255.0f);
+    out.g = (uint8_t)(in.v * 255.0f);
+    out.b = (uint8_t)(in.v * 255.0f);
+    return out;
+  }
+  float hh = in.h;
+  if (hh >= 360.0f)
+    hh = 0.0f;
+  hh /= 60.0f;
+  i = (long)hh;
+  auto ff = hh - i;
+  float p = in.v * (1.0f - in.s);
+  float q = in.v * (1.0f - (in.s * ff));
+  float t = in.v * (1.0f - (in.s * (1.0f - ff)));
+
+  switch (i)
+  {
+  case 0:
+    out.r = (uint8_t)(in.v * 255.0f);
+    out.g = (uint8_t)(t * 255.0f);
+    out.b = (uint8_t)(p * 255.0f);
+    break;
+  case 1:
+    out.r = (uint8_t)(q * 255.0f);
+    out.g = (uint8_t)(in.v * 255.0f);
+    out.b = (uint8_t)(p * 255.0f);
+    break;
+  case 2:
+    out.r = (uint8_t)(p * 255.0f);
+    out.g = (uint8_t)(in.v * 255.0f);
+    out.b = (uint8_t)(t * 255.0f);
+    break;
+
+  case 3:
+    out.r = (uint8_t)(p * 255.0f);
+    out.g = (uint8_t)(q * 255.0f);
+    out.b = (uint8_t)(in.v * 255.0f);
+    break;
+  case 4:
+    out.r = (uint8_t)(t * 255.0f);
+    out.g = (uint8_t)(p * 255.0f);
+    out.b = (uint8_t)(in.v * 255.0f);
+    break;
+  case 5:
+  default:
+    out.r = (uint8_t)(in.v * 255.0f);
+    out.g = (uint8_t)(p * 255.0f);
+    out.b = (uint8_t)(q * 255.0f);
+    break;
+  }
+  return out;
+}

espmusicmouse/lib/ledtl/helpers/ColorHSV.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <cstdint>
+
+struct ColorHSV
+{
+  float h, s, v;
+};