Fish[] fish = new Fish [6];

void setup() {
  size(640,480);
  smooth();
  for (int i = 0; i < fish.length; i++) {
     fish[i] = new Fish (color (i*2), 0, i/20.0);
  }
}

void draw (){
  background (0);
  for (int i = 0; i < fish.length; i++) {
    fish[i].move();
    fish[i].display();
  }
}

class Fish {
  float xpos;
  float ypos;
  float xspeed;
  
Fish (float xpos_, float ypos_, float xspeed_) {
    xpos = 300 + 1;
    ypos = 300 + 1;
    xspeed = xspeed_;
  }
  
  void display() {
    smooth();
    rectMode (CENTER);
    fill (200,0,0);
    ellipse (xpos, ypos, 70,40);
    fill (0);
    ellipse (xpos-11,ypos-9, 10,15);
    fill (200,0,0);
    rect (xpos+38,ypos,8,40);

//tried to do another for loop for sonar,
//but ended up with a while loop (whoops)

int i = 0;
  while (i < width) {
    noStroke();
    float distance = abs (mouseX - i);
    fill(200,0,0 + distance);
    rect(i,0,10, height);
    i += 10;
  }
}
  
void move() {
  xpos = xpos + xspeed*5;
  if (0 > width) {
    xpos = 0;
    }
  }
}