int amount = 400;
grain[] saltGrain = new grain[amount];
int shift = -10;
int dir = 3;
PImage shaker;
int grainNum = 0;
int grainRecycle= 0;
boolean fs=true;
boolean fsfalse=false;


void setup(){
  size(400,600);
  background(0);
  framerate(100);
  noStroke();
  smooth();
  shaker =  loadImage("shaker.gif");
  for (int i=0; i < amount; i++){
    saltGrain[i] = new grain(false);
  }
}


void draw(){
  background(0);
  if(mousePressed){
    shift = shift + dir;
    if (shift > 21 || shift < -21){
      dir = dir *-1;
    }
    grainNum++;
    if (grainNum>amount-1){
      grainNum=0;
    }
    grainRecycle = grainNum + 1;
    if (grainRecycle >amount-1){
      grainRecycle = 0;
    }
    saltGrain[grainNum].switch2(fs);
    saltGrain[grainRecycle].switch2(fsfalse);
  }

  for (int i=0; i < amount; i++){
    saltGrain[i].render();
    saltGrain[i].fallDown();
  }
  image(shaker, (mouseX-80)+shift, mouseY-314);
}