Added FireEffect. Its values still need a bit of tweaking to look right...

include/config.sample.h

@@ -57,6 +57,9 @@
 #define EFFECT_SNAKE_DIRECTION_CHANGE 10
 #define EFFECT_SNAKE_SLOWDOWN 2
 
+#define EFFECT_FIRE_COOLDOWN 192
+#define EFFECT_FIRE_SPARK_CHANCE 5
+
 #ifdef DEBUG
   #define LOG(x) mqtt_log(x); Serial.print(x);
   #define LOGln(x) mqtt_log_ln(x); Serial.println(x);

include/effect_fire.h

@@ -0,0 +1,19 @@
+#pragma once
+#include "Effect.h"
+#include "my_fastled.h"
+
+class FireEffect : public Effect {
+	private:
+		uint8_t* data;
+		uint8_t spark_temp();
+		void cooldown();
+		void spark();
+		void propagate();
+		void draw();
+		static CRGBPalette16 palette;
+		
+	public:
+		void start();
+		void stop();
+		void loop();
+};

src/effect_fire.cpp

@@ -0,0 +1,54 @@
+#include "effect_fire.h"
+#include "my_color_palettes.h"
+#include "config.h"
+#include "my_fastled.h"
+#include "functions.h"
+
+void FireEffect::start() {
+	this->data = new uint8_t[LED_COUNT];
+	for (int i=0; i<LED_COUNT; i++) this->data[i]=0;
+	for (int i=0; i<LED_WIDTH; i++) this->data[i]=this->spark_temp();
+}
+
+void FireEffect::stop() {
+	delete [] this->data;
+}
+
+void FireEffect::loop() {
+	cooldown();
+	spark();
+	propagate();
+	draw();
+}
+
+void FireEffect::cooldown() {
+	for(int i=0; i<LED_COUNT; i++) this->data[i] = scale8(this->data[i], EFFECT_FIRE_COOLDOWN); // 240 or something
+}
+
+void FireEffect::spark() {
+	for(int x=0; x<LED_WIDTH; x++) if (random8(EFFECT_FIRE_SPARK_CHANCE)==0) this->data[x] = this->spark_temp();
+}
+
+inline uint8_t FireEffect::spark_temp() {
+	return random8(180, 255);
+}
+
+void FireEffect::propagate() {
+	for (int y=1; y<LED_HEIGHT; y++) for (int x=0; x<LED_WIDTH; x++) {
+		int index = y*LED_WIDTH + x;
+		uint8_t below_index = (y-1)*LED_WIDTH + x;
+		if (x==0) {
+			this->data[index] = scale8(this->data[below_index], 170) + scale8(this->data[below_index+1], 85);
+		} else if (x==LED_WIDTH-1) {
+			this->data[index] = scale8(this->data[below_index], 170) + scale8(this->data[below_index-1], 85);
+		} else {
+			this->data[index] = scale8(this->data[below_index], 128) + scale8(this->data[below_index-1], 64) + scale8(this->data[below_index+1], 64);
+		}
+	}
+}
+
+void FireEffect::draw() {
+	for (int y=1; y<LED_HEIGHT; y++) for (int x=0; x<LED_WIDTH; x++) {
+		setPixel(x, LED_HEIGHT - 1 - y, ColorFromPalette((CRGBPalette16) palette_fire, this->data[y*LED_WIDTH + x]));
+	}
+}

src/effects.cpp

@@ -15,6 +15,7 @@
 #include "effect_cycle.h"
 #include "effect_confetti.h"
 #include "effect_snake.h"
+#include "effect_fire.h"
 
 SimpleList<EffectEntry>* effects;
 SimpleList<Effect*>* cycle_effects;
@@ -35,6 +36,7 @@ CycleEffect effect_cycle;
 TwirlEffect effect_twirl;
 ConfettiEffect effect_confetti;
 SnakeEffect effect_snake;
+FireEffect effect_fire;
 
 Effect* current_effect;
 
@@ -57,6 +59,7 @@ void setup_effects() {
 	effects->add((EffectEntry){"heart", (Effect*)&effect_anim_heart});
 	effects->add((EffectEntry){"confetti", (Effect *)&effect_confetti});
 	effects->add((EffectEntry){"snake", (Effect *)&effect_snake});
+	effects->add((EffectEntry){"fire", (Effect *)&effect_fire});
 
 	cycle_effects->add(&effect_sinematrix3);
 	cycle_effects->add(&effect_single_dynamic);