Fire.cpp

#include "Fire.h"
#include "FastLED.h"

Fire::Fire(Lamp* thelamp, String name) : LampAnimation(thelamp, name) {
  int num_leds = lamp->getNumLeds();
  // Array of temperature readings at each simulation cell
  byte heat[num_leds];
}

int Fire::itterate()
{
  if(tick()) {
    random16_add_entropy( random(0, 900000));
    int num_leds = lamp->getNumLeds();
  
    // Step 1.  Cool down every cell a little
    for( int i = 0; i < num_leds; i++) {
      heat[i] = qsub8( heat[i],  random8(0, ((cooling * 10) / num_leds) + 2));
    }
  
    // Step 2.  Heat from each cell drifts 'up' and diffuses a little
    for( int k= num_leds - 1; k >= 2; k--) {
      heat[k] = (heat[k - 1] + heat[k - 2] + heat[k - 2] ) / 3;
    }
  
    // Step 3.  Randomly ignite new 'sparks' of heat near the bottom
    if( random8() < sparking ) {
      int y = random8(7);
      heat[y] = qadd8( heat[y], random8(160,255) );
    }
  
    // Step 4.  Map from heat cells to LED colors
    for( int j = 0; j < num_leds; j++) {
      lamp->setLed(j, HeatColor(heat[j]));
    }
    lamp->render();
  }
  return 1;
}

void Fire::reset()
{
  fps = 60;
  cooling = 55;
  sparking = 120;
}