export class Vector2D {
  constructor(x = 0, y = 0) {
    this.x = x;
    this.y = y;
  }

  mulS(scalar) {
    return new Vector2D(this.x * scalar, this.y * scalar);
  }

  mulV(vector) {
    return new Vector2D(this.x * vector.x, this.y * vector.y);
  }

  divS(scalar) {
    return new Vector2D(this.x / scalar, this.y / scalar);
  }

  divV(vector) {
    return new Vector2D(this.x / vector.x, this.y / vector.y);
  }

  addS(scalar) {
    return new Vector2D(this.x + scalar, this.y + scalar);
  }

  addV(vector) {
    return new Vector2D(this.x + vector.x, this.y + vector.y);
  }

  subS(scalar) {
    return new Vector2D(this.x - scalar, this.y - scalar);
  }

  subV(vector) {
    return new Vector2D(this.x - vector.x, this.y - vector.y);
  }

  dot(vector) {
    return this.x * vector.x + this.y * vector.y;
  }

  abs() {
    return new Vector2D(Math.abs(this.x), Math.abs(this.y));
  }

  length() {
    return Math.sqrt(this.dot(this));
  }

  lengthSqrt() {
    return this.dot(this);
  }

  normalize() {
    const length = this.length();
    this.x /= length;
    this.y /= length;
    return this;
  }

  rotate(angle) {
    const cos = Math.cos(angle);
    const sin = Math.sin(angle);
    return new Vector2D(this.x * cos - this.y * sin, this.x * sin + this.y * cos);
  }
}