Snow.pde

AccelerometerManager accel;
float ax, ay, az;

void setup() {
  accel = new AccelerometerManager(this);
  orientation(PORTRAIT);
  background (0);
  fill(255);
  flakes = new flake [N];
  for(int i=0;i<N;i++)
    flakes[i]=new flake(random(1)*width, 
    random(1)*height,
    random(2),
    random(2),
    random(3000),
    random(2));
}
int N = 50;
class flake {
  public float x;
  public float y;
  public float yv;
  public float xv;
  public float s;
  public float r;
  flake(float _x,float _y, float _yv,float _xv,float _s,float _r){
    this.x = _x;
    this.y = _y;
    this.yv = _yv;
    this.xv = _xv;
    this.s = _s;
    this.r = _r;
  }
  
}
flake[] flakes;
float i=0;

void draw() {
  fill(0,0,0,170);
  rect(-10,-10,width+10, height+10);
  fill(255);
  stroke(255);
  
  if(mousePressed){
    
  }
  
  for(int j=0;j<N;j++){
    float rad = flakes[j].r*4;//noise(i*0.01)*200
    flakes[j].y += flakes[j].yv;
    flakes[j].x -= 2*(0.5-noise(flakes[j].s));
    flakes[j].y += 2*(0.5-noise(flakes[j].s));
    flakes[j].x -= flakes[j].xv;
    flakes[j].s += 0.01*flakes[j].r;
    flakes[j].yv = ay*0.314;
    flakes[j].xv = ax*0.314;
    ellipse(flakes[j].x ,flakes[j].y ,rad,rad);
    if(flakes[j].y > height) 
       flakes[j].y = 0;
     if(flakes[j].y<0)
       flakes[j].y = height;
     if(flakes[j].x > width)
      flakes[j].x =0;
     if(flakes[j].x < 0)
      flakes[j].x = width;
      
  }
  
}

public void resume() {
  if (accel != null) {
    accel.resume();
  }
}

public void pause() {
  if (accel != null) {
    accel.pause();
  }
}

public void shakeEvent(float force) {
  println("shake : " + force);
}

public void accelerationEvent(float x, float y, float z) {
//  println("acceleration: " + x + ", " + y + ", " + z);
  ax = x;
  ay = y;
  az = z;
}