fish_v2.pde

int num = 50;
int[] x = new int[num];
int[] y = new int[num];

ArrayList<Fish> fishies = new ArrayList<Fish>();

void setup() {
  size(500, 500);
  noStroke();
  fill(255, 102);
  
  // add some fish
  for (int i = 0; i < num; ++i) {
    fishies.add(new Fish(int(random(50)), int(random(50)), #FFFFFF)); 
  }
}
 
void draw() {
  
  background(0);
  
  // Shift the values to the right
  for (int i = num-1; i > 0; i--) {
    x[i] = x[i-1];
    y[i] = y[i-1];
  }
  
  // Add the new values to the beginning of the array
  x[0] = mouseX;
  y[0] = mouseY;
  
  fishies.add(new Fish(x[0], y[0], #FFFFFF));
  
  // Draw the fish
  for (int i = 0; i < num; i++) {
    Fish f = fishies.get(i);
    f.drawFish();
  }
  
  fishies.remove(0);
}