player.js

class Player {
  constructor() {
    this.velocity = new createVector(0, 0);
    this.location = new createVector(0, 0);
    this.acceleration = new createVector(0, 0);

    this.size = 70;
    this.speed = 0.15;
    this.maxSpeed = 10;
    this.turnRate = 2;
    this.attackSpeed = 5; // bullet per second

    this.bulletSystem = new BulletSystem();
    this.secSinceLastFire = 0;
  }

  run() {
    this.draw();
    this.move();
    this.edges();
    this.interaction();
    this.appylyFriction();
    this.bulletSystem.run();
    this.secSinceLastFire += deltaTime / 100;
  }

  move() {
    this.velocity.add(this.acceleration);
    this.location.add(this.velocity);
    this.acceleration.mult(0);
    this.velocity.limit(this.maxSpeed);
  }

  draw() {
    stroke(0);
    
    this.setGunDirection();
    ellipse(this.location.x, this.location.y, this.size, this.size);
  }


  setGunDirection() {
    push();
    let s = screenPosition(this.location);
    let angle = Math.atan2(mouseY - s.y, mouseX - s.x);
    translate(this.location.x, this.location.y);
    rotate(angle);
    fill("black");
    rectMode(CENTER);
    rect(this.size / 2, 0, this.size * 0.9, 20);
    pop();
  }

  interaction() {
    if (keyIsDown(87)) {
      // w
      this.applyForce(createVector(0, -this.speed));
    }
    if (keyIsDown(65)) {
      // a
      this.applyForce(createVector(-this.speed, 0));
    }
    if (keyIsDown(83)) {
      // s
      this.applyForce(createVector(0, this.speed));
    }
    if (keyIsDown(68)) {
      // d
      this.applyForce(createVector(this.speed, 0));
    }
    if (mouseIsPressed) {
      // space
      this.fire();
    }
  }

  edges() {
    if (this.location.x - this.size / 2 < -playBox.width / 2) {
      this.location.x = -playBox.width / 2 + this.size / 2;
      this.velocity.x = 0;
    } else if (this.location.x + this.size / 2 > playBox.width / 2) {
      this.location.x = playBox.width / 2 - this.size / 2;
      this.velocity.x = 0;
    } else if (this.location.y - this.size / 2 < -playBox.height / 2) {
      this.location.y = -playBox.height / 2 + this.size / 2;
      this.velocity.y = 0;
    } else if (this.location.y + this.size / 2 > playBox.height / 2) {
      this.location.y = playBox.height / 2 - this.size / 2;
      this.velocity.y = 0;
    }
  }
  applyForce(f) {
    this.acceleration.add(f);
  }
  appylyFriction() {
    let friction = this.velocity.copy();
    friction.mult(-1);
    friction.normalize();
    friction.mult(0.1);
    this.applyForce(friction);
  }

  fire() {
    if (this.secSinceLastFire * (this.attackSpeed / 10) > 1) {
      this.secSinceLastFire = 0;
      let mouseDir = createVector(mouseX, mouseY).sub(
        screenPosition(this.location)
      );
      mouseDir.setMag(this.size);
      this.bulletSystem.fire(
        this.location.x,
        this.location.y,
        mouseDir,
        p5.Vector.add(this.location, mouseDir)
      );
    }
  }
}