BouncingColoredBalls

// Ce sketch, n'est pas de moi, je le poste juste pour une question



void BouncingColoredBalls(int BallCount, byte colors[][3])

  {
  float Gravity = -9.81;
  int StartHeight = 1;
  float Height[BallCount];
  float ImpactVelocityStart = sqrt( -2 * Gravity * StartHeight );
  float ImpactVelocity[BallCount];
  float TimeSinceLastBounce[BallCount];
  int   Position[BallCount];
  long  ClockTimeSinceLastBounce[BallCount];

  float Dampening[BallCount];


  for (int i = 0 ; i < BallCount ; i++)
  {

  TestBP ();

  ClockTimeSinceLastBounce[i] = millis();
  Height[i] = StartHeight;
  Position[i] = 0;
  ImpactVelocity[i] = ImpactVelocityStart;
  TimeSinceLastBounce[i] = 0;
  Dampening[i] = 0.90 - float(i)/pow(BallCount,2);
  }

  while (true)

  {
  for (int i = 0 ; i < BallCount ; i++)
  {
  TimeSinceLastBounce[i] =  millis() - ClockTimeSinceLastBounce[i];
  Height[i] = 0.5 * Gravity * pow( TimeSinceLastBounce[i]/1000 , 2.0 ) + ImpactVelocity[i] * TimeSinceLastBounce[i]/1000;

  if ( Height[i] < 0 )
  {
  Height[i] = 0;
  ImpactVelocity[i] = Dampening[i] * ImpactVelocity[i];
  ClockTimeSinceLastBounce[i] = millis();
  if ( ImpactVelocity[i] < 0.01 )
  {
  ImpactVelocity[i] = ImpactVelocityStart;
  }
  }

  Position[i] = round( Height[i] * (NUM_LEDS1 - 1) / StartHeight);
  }
  for (int i = 0 ; i < BallCount ; i++)
  {
  setPixel(Position[i],colors[i][0],colors[i][1],colors[i][2]);
  }
  showStrip();

  TestBP ();

  setAll(0,0,0);
  }
  }