ArrayList Problems / get() & remove()

Processing Coding Questions
8

Hi Everyone,

So my code is progressing well. I am looking for a way to erase the aliens when bullets touch them.
I am a bit lost regarding the boolean variable using the distance between the bullets and the round body of the aliens.

I want to kill the aliens when a bullet hits them, erase them from the screen and from the list.

A solution for it?

Thank you,

Rémy


Alien[]aliens = new Alien[1000];
SpaceShip spaceship;
ArrayList<Bullet> bullets;
Timer timer;

int totalAliens = 0;

void setup(){
  
  size(600,400);
  smooth();
  frameRate(60);
  
  timer = new Timer(1000);
  timer.start();
  
  spaceship = new SpaceShip(10);
  
    
  bullets = new ArrayList<Bullet>();
  bullets.add(new Bullet(mouseX,mouseY));
  
}

void draw(){
  
  background(255);
  
    if(timer.isFinished()){
       aliens[totalAliens] = new Alien();
       totalAliens++;
       if (totalAliens >= aliens.length){
         totalAliens = 0;
       }
      timer.start();
    }
  
  for (int i = bullets.size()-1; i >= 0; i--) { 
  Bullet b = bullets.get(i);
  b.move();
  b.display();
  
  if (b.finished()){
    bullets.remove(i);
  }
 }
  
  
  for (int i = 0; i < totalAliens ; i++){
  aliens[i].move();
  aliens[i].display();
  }
  
  spaceship.move(mouseX, mouseY);
  spaceship.display();

}


void mousePressed(){
  bullets.add(new Bullet(mouseX,mouseY));
}

class Timer{

  int savedTime;
  int totalTime;

  Timer(int _tempTotalTime){
    totalTime = _tempTotalTime; 
  }

  void start(){
    savedTime = millis();
  }

  boolean isFinished(){
    int passedTime = millis() - savedTime;
    if(passedTime > totalTime){
      return true;
    } else {
      return false;
    }
  }
}

class Alien {
  
  float x;
  float y;
  float diam;
  float speed;
  
  Alien(){
    x = random(width);
    y = random(-100,-50);
    diam = random(20,40);
    speed = diam*0.1;
  }
  
  
  void move(){
    y += speed;
  }
  
  
  void display(){
    
    stroke(0);
    strokeWeight(diam*0.1);

    ellipseMode(CENTER);
    noFill();
    arc(x, y + diam*0.5, 2*diam, diam, -PI, 0);
  
    arc (x-diam,y+diam*0.75,diam*0.5,diam*0.5,-PI,0);
    arc (x+diam,y+diam*0.75,diam*0.5,diam*0.5,-PI,0);
  
    fill(200);
    ellipse(x,y,diam,diam);
  }
  
  boolean reachedBottom(){
    if (y > height + diam*4){
      return true;
    } else {
      return false;
    }
  }
  
}


class Bullet{
  
  float bulletX1, bulletY1;
  float bulletX2, bulletY2;
  int r;
  int bulletSpeed;
  
  Bullet(float _x, float _y){
    
    bulletX1 = _x - 20;
    bulletY1 = _y - 15;
    bulletX2 = _x + 20;
    bulletY2 = _y - 15;
    r = 6;
    bulletSpeed = 2;
  
  }
  
  void move(){
    bulletY1 -= bulletSpeed;
    bulletY2 -= bulletSpeed;
  }
  
    boolean finished() {
    if ((bulletY1<0) || (bulletY2<0)) {
      return true;
    } else {
      return false;
    }
  }
  
  void display(){
    fill(255,0,0);
    noStroke();
    ellipse (bulletX1,bulletY1,r,r);
    ellipse (bulletX2,bulletY2,r,r);  
  }
  
   boolean intersect(Alien d){
   float distance = dist(bulletX1,bulletY1,d.x,d.y);
  if (distance < r + d.diam){
    return true;
  } else {
    return false;
  }
}
  

}


class SpaceShip{
  
float x;
float y;
int shipRatio;

 SpaceShip(int tempShipRatio){
   x = width/2;
   y = height/2;
   shipRatio = tempShipRatio;
 }
 
 void move (float tempX, float tempY){
   x = tempX;
   y = tempY + shipRatio*2;;
   
 }
 
 void display(){
  stroke(0);
  strokeWeight (3);
  fill(210);
  
  line (x - shipRatio*2, y - shipRatio, x - shipRatio*2, y - shipRatio*4);
  line (x + shipRatio*2, y - shipRatio, x + shipRatio*2, y - shipRatio*4);
  
  triangle (x - shipRatio*3, y - shipRatio, x, y - shipRatio*4, x + shipRatio*3, y-shipRatio);
  
  }
}