Implement a Resize/Move/Save Visitor Pattern

I am making a paint program where i can make Rectangle/Ellipse. In that program i can move/resize them but also save them.

My problem is now that i need to make a visitor pattern(Resize/Move and save) But I don't know where i should start.

These are the method i use at the moment:

public abstract void ResizeShape(PosSizableRect posSizableRect, float lastX, float lastY, float newX, float newY);
public abstract void MoveShape(int x, int y);
private void Write(List<Shape> shapes, StreamWriter streamWriter, string tabs = "")

sorry can't give you pictures because of my reputation...