code: public void set(Vector2f start, Vector2f end) {
  		super.pointsDirty = true;
  		if (this.start == null) {
  			this.start = new Vector2f();
  		}
  		this.start.set(start);
  
  		if (this.end == null) {
  			this.end = new Vector2f();
  		}
  		this.end.set(end);
  
  		vec = new Vector2f(end);
  		vec.sub(start);
  
  		lenSquared = vec.lengthSquared();
  	}
docs: Configure the line
  
  @param start
  The start point of the line
  @param end
  The end point of the line