export interface Velocity {
  x: number;
  y: number;
}

export class Position {
  constructor(public x: number, public y: number) {}

  clone(): Position {
    return new Position(this.x, this.y);
  }

  moveX(x: number): Position {
    this.x = x;
    return this;
  }

  moveY(y: number): Position {
    this.y = y;
    return this;
  }

  move(x: number, y: number): Position {
    this.x = x;
    this.y = y;
    return this;
  }

  addX(x: number): Position {
    return this.add(x, 0);
  }

  addY(y: number): Position {
    return this.add(0, y);
  }

  add(x: number, y: number): Position {
    this.x += x;
    this.y += y;
    return this;
  }
}

export interface Size {
  width: number;
  height: number;
}

export interface Element {
  size: Size;
  pos: Position;
  instance: HTMLElement;
  update(): void;
}