library-ts/browser/geometry/Vector2.ts

export class Vector2
{
  x:number = 0;
  y:number = 0;
  
  constructor( x:number = 0, y:number = 0 )
  {
    this.x = x;
    this.y = y;
  }
  
  clone():Vector2
  {
    return new Vector2( this.x, this.y );
  }

  set( x:number, y:number )
  {
    this.x = x;
    this.y = y;
  }

  add( other:Vector2 )
  {
    this.x += other.x;
    this.y += other.y;

    return this;
  }

  sub( other:Vector2 )
  {
    this.x -= other.x;
    this.y -= other.y;

    return this;
  }

  multiply( value:number )
  {
    this.x *= value;
    this.y *= value;

    return this;
  }

  get length() 
  {
    return Math.sqrt( this.x * this.x + this.y * this.y );
  }

}