Merge pull request #182 from AlexxBoo/fibonacci256

Emitter Pattern

Author: jasoncoon

Map.h

@@ -76,9 +76,9 @@ void andPixelAR(uint8_t angle, uint8_t dAngle, uint8_t startRadius, uint8_t endR
   }
 }
 
-void antialiasPixelAR(uint8_t angle, uint8_t dAngle, uint8_t startRadius, uint8_t endRadius, CRGB color)
+void antialiasPixelAR(uint8_t angle, uint8_t dAngle, uint8_t startRadius, uint8_t endRadius, CRGB color, CRGB leds[] = leds, int _NUM_LEDS = NUM_LEDS)
 {
-  for (uint16_t i = 0; i < NUM_LEDS; i++) {
+  for (uint16_t i = 0; i < _NUM_LEDS; i++) {
     uint8_t o = i;
 
     uint8_t ao = angles[o];

esp8266-fastled-webserver.ino

@@ -67,6 +67,7 @@ NTPClient timeClient(ntpUDP, "pool.ntp.org", utcOffsetInSeconds);
 #define LED_TYPE WS2812B
 #define COLOR_ORDER GRB
 #define NUM_LEDS 256
+#define NUM_LEDS_3 NUM_LEDS * 3
 
 #define MILLI_AMPS 2000       // IMPORTANT: set the max milli-Amps of your power supply (4A = 4000mA)
 #define FRAMES_PER_SECOND 120 // here you can control the speed. With the Access Point / Web Server the animations run a bit slower.
@@ -200,6 +201,7 @@ PatternAndNameList patterns = {
   { swirlFibonacci, "Swirl Fibonacci"},
   { fireFibonacci, "Fire Fibonacci" },
   { waterFibonacci, "Water Fibonacci" },
+  { emitterFibonacci, "Emitter Fibonacci" },
 
   { pacifica_loop,           "Pacifica" },
   { pacifica_fibonacci_loop, "Pacifica Fibonacci" },
@@ -1457,6 +1459,45 @@ void waterFibonacci() {
   }
 }
 
+/**
+ * Emits arcs of color spreading out from the center to the edge of the disc.
+ */
+void emitterFibonacci() {
+  static CRGB ledBuffer[NUM_LEDS]; // buffer for better fade behavior
+  const uint8_t dAngle = 32; // angular span of the traces
+  const uint8_t dRadius = 12; // radial width of the traces
+  const uint8_t vSpeed = 16; // max speed variation
+
+  static const uint8_t eCount = 7; // Number of simultanious traces
+  static uint8_t angle[eCount]; // individual trace angles
+  static uint16_t timeOffset[eCount]; // individual offsets from beat8() function
+  static uint8_t speedOffset[eCount]; // individual speed offsets limited by vSpeed
+  static uint8_t sparkIdx = 0; // randomizer cycles through traces to spark new ones
+
+  // spark new trace
+  EVERY_N_MILLIS(20) {
+    if (random8(17) <= (speed >> 4)) { // increase change rate for higher speeds
+      angle[sparkIdx] = random8();
+      speedOffset[sparkIdx] = random8(vSpeed); // individual speed variation
+      timeOffset[sparkIdx] = beat8(qadd8(speed,speedOffset[sparkIdx]));
+      sparkIdx = addmod8(sparkIdx, 1, eCount); // continue randomizer at next spark
+    }
+  }
+
+  // fade traces
+  fadeToBlackBy( ledBuffer, NUM_LEDS, 6 + (speed >> 3));
+
+  // draw traces
+  for (uint8_t e = 0; e < eCount; e++) {
+    uint8_t startRadius = sub8(beat8(qadd8(speed, speedOffset[e])), timeOffset[e]);
+    uint8_t endRadius = add8(startRadius, dRadius + (speed>>5)); // increase radial width for higher speeds
+    antialiasPixelAR(angle[e], dAngle, startRadius, endRadius, ColorFromPalette(gCurrentPalette, startRadius), ledBuffer);
+  }
+
+  // copy buffer to actual strip
+  memcpy(leds, ledBuffer, NUM_LEDS_3);
+}
+
 void wheel() {
   for (uint16_t i = 0; i < NUM_LEDS; i++) {
     uint8_t j = beat8(speed);