add new effect: PS Galaxy

- parameters tuned to make it look good on most settings

wled00/FX.cpp

@@ -8958,6 +8958,104 @@ uint16_t mode_particleblobs(void) {
   return FRAMETIME;
 }
 static const char _data_FX_MODE_PARTICLEBLOBS[] PROGMEM = "PS Blobs@Speed,Blobs,Size,Life,Blur,Wobble,Collide,Pulsate;;!;2v;sx=30,ix=64,c1=200,c2=130,c3=0,o3=1";
+
+/*
+  Particle Galaxy, particles spiral like in a galaxy
+  Uses palette for particle color
+  by DedeHai (Damian Schneider)
+*/
+uint16_t mode_particlegalaxy(void) {
+  ParticleSystem2D *PartSys = nullptr;
+  PSsettings2D sourcesettings;
+  sourcesettings.asByte = 0b00001100; // PS settings for bounceY, bounceY used for source movement (it always bounces whereas particles do not)
+  if (SEGMENT.call == 0) { // initialization
+    if (!initParticleSystem2D(PartSys, 1, 0, true)) // init using 1 source and advanced particle settings
+      return mode_static(); // allocation failed or not 2D
+    PartSys->sources[0].source.vx = -4; // will collide with wall and get random bounce direction
+    PartSys->sources[0].source.x =  PartSys->maxX >> 1; // start in the center
+    PartSys->sources[0].source.y =  PartSys->maxY >> 1;
+    PartSys->sources[0].sourceFlags.perpetual = true; //source does not age
+    PartSys->sources[0].maxLife = 4000; // lifetime in frames
+    PartSys->sources[0].minLife = 800;
+    PartSys->setWallHardness(255);  //bounce forever
+    PartSys->setWallRoughness(200); //randomize wall bounce
+  }
+  else {
+    PartSys = reinterpret_cast<ParticleSystem2D *>(SEGENV.data); // if not first call, just set the pointer to the PS
+  }
+  if (PartSys == nullptr)
+    return mode_static(); // something went wrong, no data!
+  // Particle System settings
+  PartSys->updateSystem(); // update system properties (dimensions and data pointers)
+  uint8_t particlesize = SEGMENT.custom1;
+  if(SEGMENT.check3)
+    particlesize =  SEGMENT.custom1 ? 1 : 0; // set size to 0 (single pixel) or 1 (quad pixel) so motion blur works and adds streaks
+  PartSys->setParticleSize(particlesize); // set size globally
+  PartSys->setMotionBlur(250 * SEGMENT.check3); // adds trails to single/quad pixel particles, no effect if size > 1
+
+  if ((SEGMENT.call % ((33 - SEGMENT.custom3) >> 1)) == 0) // change hue of emitted particles
+    PartSys->sources[0].source.hue+=2;
+
+  if (hw_random8() < (10 + (SEGMENT.intensity >> 1))) // 5%-55% chance to emit a particle in this frame
+    PartSys->sprayEmit(PartSys->sources[0]);
+
+  if ((SEGMENT.call & 0x3) == 0) // every 4th frame, move the emitter
+    PartSys->particleMoveUpdate(PartSys->sources[0].source, PartSys->sources[0].sourceFlags, &sourcesettings);
+
+  // move alive particles in a spiral motion (or almost straight in fast starfield mode)
+  for (uint32_t i = 0; i < PartSys->usedParticles; i++) { //check all particles
+    if (PartSys->particles[i].ttl == 0) continue; //skip dead particles
+
+    int32_t centerx = PartSys->maxX >> 1; // center of matrix in subpixel coordinates
+    int32_t centery = PartSys->maxY >> 1;
+    // (dx/dy): vector pointing from particle to center
+		int32_t dx = centerx - PartSys->particles[i].x;
+		int32_t dy = centery - PartSys->particles[i].y;
+    //speed towards center:
+		int32_t distance = sqrt32_bw(dx * dx + dy * dy); // absolute distance to center
+    if (distance < 20) distance = 20; // avoid division by zero, keep a minimum
+		int32_t speedfactor;
+    if (SEGMENT.check2) { // starfield mode
+      PartSys->setKillOutOfBounds(true);
+      PartSys->sources[0].source.hue = hw_random16(); // start with random color
+      PartSys->sources[0].var = 7; // emiting variation
+      PartSys->sources[0].source.x =  PartSys->maxX >> 1; // set emitter to center
+      PartSys->sources[0].source.y =  PartSys->maxY >> 1;
+      speedfactor = 1 + (1 + (SEGMENT.speed >> 1)) * distance; // speed increases towards edge
+      PartSys->particles[i].x += (-speedfactor * dx) / 400000 - (dy >> 6);
+      PartSys->particles[i].y += (-speedfactor * dy) / 400000 + (dx >> 6);
+    }
+    else {
+      PartSys->setKillOutOfBounds(false);
+      PartSys->sources[0].var = 1; // emiting variation
+      speedfactor = 2 + (((50 + SEGMENT.speed) << 6) / distance); // speed increases towards center
+      // rotate clockwise
+      int32_t tempVx = (-speedfactor * dy); // speed is orthogonal to center vector
+      int32_t tempVy =  (speedfactor * dx);
+      //add speed towards center to make particles spiral in
+      int vxc = (dx << 9) / (distance - 19); // subtract value from distance to make the pull-in force a bit stronger (helps on faster speeds)
+      int vyc = (dy << 9) / (distance - 19);
+      //apply velocity
+      PartSys->particles[i].x += (tempVx + vxc) / 1024; // note: cannot use bit shift as that causes asymmetric rounding
+      PartSys->particles[i].y += (tempVy + vyc) / 1024;
+
+      if (distance < 128) { // close to center
+        if (PartSys->particles[i].ttl > 3)
+          PartSys->particles[i].ttl -= 4; //age fast
+        PartSys->particles[i].sat = distance << 1; // turn white towards center
+      }
+    }
+    if(SEGMENT.custom3 == 31) // color by age but mapped to 1024 as particles have a long life, since age is random, this gives more or less random colors
+      PartSys->particles[i].hue = PartSys->particles[i].ttl >> 2;
+    else if(SEGMENT.custom3 == 0) // color by distance
+      PartSys->particles[i].hue = map(distance, 20, (PartSys->maxX + PartSys->maxY) >> 2, 0, 180); // color by distance to center
+  }
+
+  PartSys->update(); // update and render
+  return FRAMETIME;
+}
+static const char _data_FX_MODE_PARTICLEGALAXY[] PROGMEM = "PS Galaxy@!,!,Size,,Color,,Starfield,Trace;;!;2;pal=59,sx=80,c1=2,c3=4";
+
 #endif //WLED_DISABLE_PARTICLESYSTEM2D
 #endif // WLED_DISABLE_2D
 
@@ -10657,6 +10755,7 @@ void WS2812FX::setupEffectData() {
   addEffect(FX_MODE_PARTICLECENTERGEQ, &mode_particlecenterGEQ, _data_FX_MODE_PARTICLECIRCULARGEQ);
   addEffect(FX_MODE_PARTICLEGHOSTRIDER, &mode_particleghostrider, _data_FX_MODE_PARTICLEGHOSTRIDER);
   addEffect(FX_MODE_PARTICLEBLOBS, &mode_particleblobs, _data_FX_MODE_PARTICLEBLOBS);
+  addEffect(FX_MODE_PARTICLEGALAXY, &mode_particlegalaxy, _data_FX_MODE_PARTICLEGALAXY);
 #endif // WLED_DISABLE_PARTICLESYSTEM2D
 #endif // WLED_DISABLE_2D
 

wled00/FX.h

@@ -353,7 +353,8 @@ extern byte realtimeMode;           // used in getMappedPixelIndex()
 #define FX_MODE_PS1DSONICSTREAM        214
 #define FX_MODE_PS1DSONICBOOM          215
 #define FX_MODE_PS1DSPRINGY            216
-#define MODE_COUNT                     217
+#define FX_MODE_PARTICLEGALAXY         217
+#define MODE_COUNT                     218
 
 
 #define BLEND_STYLE_FADE            0x00  // universal