Hitting a target with bullets

[worn lark]

I have been working on hitting a target with particle "bullets".
Since I have a circle/circle collision that works I thought I would try it. My problem is I am unsure how to get a usable x value for the collision mathematics. My print statement does not show a change in value. It remains 400. My method doesn't use vector math. It uses speed. I was hoping to use a vector just for the experience. Here is my code. My goal is to get the asteroid to change state(color).

import java.util.Iterator;
ArrayList<Bullet>bullets;

Laser laser;
float x, y;
float x2,y2;
float cx, cy, cSize,speed;
float sx, sy;
void setup() {
  size(800, 800);
  background(0);
  x = 400;
  y = 400;
  sx = width/2;
  sy = height/2;
  cx = 650;
  cy = 400;
  cSize = 100;
  speed = 3;
  laser = new Laser(x, y, cx, cy, cSize, sx, sy);
  bullet = new Bullet(new PVector(x,y));
  bullets = new ArrayList<Bullet>();
}
void draw() {
  background(0);
  bullet.input();
  laser.drawAsteroid();
  laser.moveAsteroid();
  laser.bounceAsteroid();
  laser.ship();
  collision();
}
  class Laser {
    Laser(float x_, float y_, float cx_, float cy_, float cSize_, float sx_, float sy_) {
      x = x_;
      y = y_;
      //x2 = x2_;
      //y2 = y2_;
      cx = cx_;
      cy = cy_;
      cSize = cSize_;
      sx = sx_;
      sy = sy_;
    }
    void ship() {
      strokeWeight(0);
      stroke(0, 0, 255);
      fill(255);
      triangle(sx-100, sy+10, sx, sy, sx-100, sy-10);
    }
    void drawAsteroid() {
      noStroke();
      fill(125);
      ellipse(cx, cy, cSize, cSize);
    }
    void moveAsteroid(){
      cy+=speed;
      //println("cy = " + cy);
    }
    void bounceAsteroid(){
      if(cy-(cSize-(cSize/2))<=0||cy+(cSize-(cSize/2))>=height){
        speed*=-1;
      }
    }
   
  }```

Bullet bullet;
class Bullet {
  PVector location;
  PVector velocity;
  PVector acceleration;
  float size;
  Bullet(PVector bullet) {
    location = bullet.copy();
    acceleration = new PVector(2, 0);
    velocity = new PVector(2, 0);
    size = 8;
  }
  void run() {
    update();
    display();
  }
  void update() {
    velocity.add(acceleration);
    location.add(velocity);
  }
  void display() {
    stroke(5);
    fill(255, 0, 0);
    ellipse(location.x, location.y, size, size);
  }
  boolean isDead() {
    if (location.x>=width) {
      return true;
    } else {
      return false;
    }
  }
  void input() {
    if (keyPressed) {
      if (key == ' ') {
        bullet.runBulletSystem();
        println("location = " + location);
      }
    }
  }
  void runBulletSystem() {
    bullets.add(new Bullet(new PVector(location.x, location.y)));
    Iterator<Bullet> it = bullets.iterator();
    while (it.hasNext()) {
      Bullet bullet = it.next();
      bullet.run();
      if (bullet.isDead()) {
        it.remove();
        println("particle is dead");
      }
    }
  }
}


boolean collision() {
  //float lineLen = dist(sx,sy,width,sy);
  //println("lineLen = " + lineLen);
  return true;
}

Please ignore the laser code. I should have removed/changed it but I haven't gotten that far. Bugging me I cant figure out why my value wont change.

I was thinking each particle will have an x,y and size value I need for the pythagorean theorem to calculate when the radii of the particle is inside the asteroid.

The first particle to strike it will change its color hopefully "explode" someday.

[worn lark]

Update: Been reading and dist() method should work. It accepts PVector as arguments.

[worn lark]

Update: dist() method was the answer. Once I get this working with a single asteroid, I need to work on the distance to multiple asteroid objects.

I am plugging along.

I need to get the bullets x and y distance value into the equation. 🤔 . I have their starting position. I need to get their "moving" value. Their moving value is updated with vector math. Think, Micky, think.

[worn lark]

I need at least two PVectors. one for bullet location and one for asteroid location. Someplace to store the locations and compare them. This is getting interesting now.

[forest sun]

Which object test the collision?

[worn lark]

@forest sun I have bullet testing for collision in the development.

I see bullet as a child of Particle in the game itself. Following the inheritance example the classes are too similar not to have a parent/child relationship.

I also have an ArrayList for bullets when I only need one "particle" ArrayList.

systems in systems example in Nature of code.

[forest sun]

Why not let the asteroids test if a bullet hits them? I think the asteroids must make the most changes on a hit for itself.