Welcome lolmasterzz, to Java Forums.
I assume that you draw your coordinates on a graphics object. Add an offset to the points before you draw them. You can use this offset to scroll across the "pane" where you draw your points. So, if the salesman moves to a point off the screen, set the offset such that the salesman is drawn onscreen. Or, you can draw on a large panel that covers all the points. Add this panel to a JScrollPane. When the salesman moves out of view, you can set the view point if the JScrollPane so that the salesman is visible again.
Hope that helps, lolmasterzz. If you like, I could give you an example.