Merge pull request #1108 from xxv/xxv-dancing-shadows

Add Dancing Shadows effect

wled00/FX.cpp

@@ -3569,4 +3569,146 @@ uint16_t WS2812FX::mode_chunchun(void)
     setPixelColor(bird, c);
   }
   return FRAMETIME;
-}
+}
+
+
+typedef struct Spotlight {
+  float speed;
+  uint8_t colorIdx;
+  int16_t position;
+  unsigned long lastUpdateTime;
+  uint8_t width;
+  uint8_t type;
+} spotlight;
+
+#define SPOT_TYPE_SOLID       0
+#define SPOT_TYPE_GRADIENT    1
+#define SPOT_TYPE_2X_GRADIENT 2
+#define SPOT_TYPE_2X_DOT      3
+#define SPOT_TYPE_3X_DOT      4
+#define SPOT_TYPE_4X_DOT      5
+#define SPOT_TYPES_COUNT      6
+
+/*
+ * Spotlights moving back and forth that cast dancing shadows.
+ * Shine this through tree branches/leaves or other close-up objects that cast
+ * interesting shadows onto a ceiling or tarp.
+ *
+ * By Steve Pomeroy @xxv
+ */
+uint16_t WS2812FX::mode_dancing_shadows(void)
+{
+  uint8_t numSpotlights = map(SEGMENT.intensity, 0, 255, 2, 50);
+  bool initialize = SEGENV.aux0 != numSpotlights;
+  SEGENV.aux0 = numSpotlights;
+
+  uint16_t dataSize = sizeof(spotlight) * numSpotlights;
+  if (!SEGENV.allocateData(dataSize)) return mode_static(); //allocation failed
+  Spotlight* spotlights = reinterpret_cast<Spotlight*>(SEGENV.data);
+
+  fill(BLACK);
+
+  unsigned long time = millis();
+  bool respawn = false;
+
+  for (uint8_t i = 0; i < numSpotlights; i++) {
+    if (!initialize) {
+      // advance the position of the spotlight
+      int16_t delta = (float)(time - spotlights[i].lastUpdateTime) *
+                  (spotlights[i].speed * ((1.0 + SEGMENT.speed)/100.0));
+
+      if (abs(delta) >= 1) {
+        spotlights[i].position += delta;
+        spotlights[i].lastUpdateTime = time;
+      }
+
+      respawn = (spotlights[i].speed > 0.0 && spotlights[i].position > (SEGLEN + 2))
+             || (spotlights[i].speed < 0.0 && spotlights[i].position < -(spotlights[i].width + 2));
+    }
+
+    if (initialize || respawn) {
+      spotlights[i].colorIdx = random8();
+      spotlights[i].width = random8(1, 10);
+
+      spotlights[i].speed = 1.0/random8(4, 50);
+
+      if (initialize) {
+        spotlights[i].position = random16(SEGLEN);
+        spotlights[i].speed *= random8(2) ? 1.0 : -1.0;
+      } else {
+        if (random8(2)) {
+          spotlights[i].position = SEGLEN + spotlights[i].width;
+          spotlights[i].speed *= -1.0;
+        }else {
+          spotlights[i].position = -spotlights[i].width;
+        }
+      }
+
+      spotlights[i].lastUpdateTime = time;
+      spotlights[i].type = random8(SPOT_TYPES_COUNT);
+    }
+
+    uint32_t color = color_from_palette(spotlights[i].colorIdx, false, false, 0);
+    int start = spotlights[i].position;
+
+    if (spotlights[i].width <= 1) {
+      if (start >= 0 && start < SEGLEN) {
+        blendPixelColor(start, color, 128);
+      }
+    } else {
+      switch (spotlights[i].type) {
+        case SPOT_TYPE_SOLID:
+          for (uint8_t j = 0; j < spotlights[i].width; j++) {
+            if ((start + j) >= 0 && (start + j) < SEGLEN) {
+              blendPixelColor(start + j, color, 128);
+            }
+          }
+        break;
+
+        case SPOT_TYPE_GRADIENT:
+          for (uint8_t j = 0; j < spotlights[i].width; j++) {
+            if ((start + j) >= 0 && (start + j) < SEGLEN) {
+              blendPixelColor(start + j, color,
+                              cubicwave8(map(j, 0, spotlights[i].width - 1, 0, 255)));
+            }
+          }
+        break;
+
+        case SPOT_TYPE_2X_GRADIENT:
+          for (uint8_t j = 0; j < spotlights[i].width; j++) {
+            if ((start + j) >= 0 && (start + j) < SEGLEN) {
+              blendPixelColor(start + j, color,
+                              cubicwave8(2 * map(j, 0, spotlights[i].width - 1, 0, 255)));
+            }
+          }
+        break;
+
+        case SPOT_TYPE_2X_DOT:
+          for (uint8_t j = 0; j < spotlights[i].width; j += 2) {
+            if ((start + j) >= 0 && (start + j) < SEGLEN) {
+              blendPixelColor(start + j, color, 128);
+            }
+          }
+        break;
+
+        case SPOT_TYPE_3X_DOT:
+          for (uint8_t j = 0; j < spotlights[i].width; j += 3) {
+            if ((start + j) >= 0 && (start + j) < SEGLEN) {
+              blendPixelColor(start + j, color, 128);
+            }
+          }
+        break;
+
+        case SPOT_TYPE_4X_DOT:
+          for (uint8_t j = 0; j < spotlights[i].width; j += 4) {
+            if ((start + j) >= 0 && (start + j) < SEGLEN) {
+              blendPixelColor(start + j, color, 128);
+            }
+          }
+        break;
+      }
+    }
+  }
+
+  return FRAMETIME;
+}

wled00/FX.h

@@ -102,7 +102,7 @@
 #define IS_REVERSE      ((SEGMENT.options & REVERSE     ) == REVERSE     )
 #define IS_SELECTED     ((SEGMENT.options & SELECTED    ) == SELECTED    )
 
-#define MODE_COUNT  112
+#define MODE_COUNT  113
 
 #define FX_MODE_STATIC                   0
 #define FX_MODE_BLINK                    1
@@ -216,6 +216,7 @@
 #define FX_MODE_PHASEDNOISE            109
 #define FX_MODE_FLOW                   110
 #define FX_MODE_CHUNCHUN               111
+#define FX_MODE_DANCING_SHADOWS        112
 
 class WS2812FX {
   typedef uint16_t (WS2812FX::*mode_ptr)(void);
@@ -419,6 +420,7 @@ class WS2812FX {
       _mode[FX_MODE_PHASEDNOISE]             = &WS2812FX::mode_phased_noise;
       _mode[FX_MODE_FLOW]                    = &WS2812FX::mode_flow;
       _mode[FX_MODE_CHUNCHUN]                = &WS2812FX::mode_chunchun;
+      _mode[FX_MODE_DANCING_SHADOWS]         = &WS2812FX::mode_dancing_shadows;
 
       _brightness = DEFAULT_BRIGHTNESS;
       currentPalette = CRGBPalette16(CRGB::Black);
@@ -617,7 +619,8 @@ class WS2812FX {
       mode_sinewave(void),
       mode_phased_noise(void),
       mode_flow(void),
-      mode_chunchun(void);
+      mode_chunchun(void),
+      mode_dancing_shadows(void);
 
   private:
     NeoPixelWrapper *bus;
@@ -667,6 +670,8 @@ class WS2812FX {
 
     CRGB twinklefox_one_twinkle(uint32_t ms, uint8_t salt, bool cat);
     CRGB pacifica_one_layer(uint16_t i, CRGBPalette16& p, uint16_t cistart, uint16_t wavescale, uint8_t bri, uint16_t ioff);
+
+    void blendPixelColor(uint16_t n, uint32_t color, uint8_t blend);
     
     uint32_t _lastPaletteChange = 0;
     uint32_t _lastShow = 0;
@@ -702,7 +707,7 @@ const char JSON_mode_names[] PROGMEM = R"=====([
 "Twinklefox","Twinklecat","Halloween Eyes","Solid Pattern","Solid Pattern Tri","Spots","Spots Fade","Glitter","Candle","Fireworks Starburst",
 "Fireworks 1D","Bouncing Balls","Sinelon","Sinelon Dual","Sinelon Rainbow","Popcorn","Drip","Plasma","Percent","Ripple Rainbow",
 "Heartbeat","Pacifica","Candle Multi", "Solid Glitter","Sunrise","Phased","Twinkleup","Noise Pal", "Sine","Phased Noise",
-"Flow","Chunchun"
+"Flow","Chunchun","Dancing Shadows"
 ])=====";
 
 

wled00/FX_fcn.cpp

@@ -620,6 +620,14 @@ void WS2812FX::fill(uint32_t c) {
   }
 }
 
+/*
+ * Blends the specified color with the existing pixel color.
+ */
+void WS2812FX::blendPixelColor(uint16_t n, uint32_t color, uint8_t blend)
+{
+  setPixelColor(n, color_blend(getPixelColor(n), color, blend));
+}
+
 /*
  * fade out function, higher rate = quicker fade
  */