I am making a map editor for a game I am working on. There is a JPanel in the JScrollPane that displays the map to be edited. What I would like to do is make it that when the user is holding down the Spacebar and dragging their mouse in the JPanel, the JScrollPanel will scroll along with the dragging. Here is what I have so far:

```
panelMapPanel.addMouseMotionListener(new MouseMotionListener(){

        @Override
        public void mouseDragged(MouseEvent e) {
            //Gets difference in distance x and y from last time this listener was called
            int deltaX = mouseX - e.getX();
            int deltaY = mouseY - e.getY();
            mouseX = e.getX();
            mouseY = e.getY();
            if(spacePressed){
                //Scroll the scrollpane according to the distance travelled
                scrollPane.getVerticalScrollBar().setValue(scrollPane.getVerticalScrollBar().getValue() + deltaY);
                scrollPane.getHorizontalScrollBar().setValue(scrollPane.getHorizontalScrollBar().getValue() + deltaX);
            }
        }

});

```

Currently it works but the scrolling is not smooth at all. Moving the mouse a lot at a time is fine but doing small drags makes the scrollpane go berserk. 

Any ideas how to improve this?

For those who enjoy a visual to help, here is the editor:

![Map Editor](https://i.stack.imgur.com/HirwT.png)

**Addition Notes (Edit):**

* I have tried `scrollPane.getViewport().setViewPosition(new Point(scrollPane.getViewport().getViewPosition().x + deltaX, scrollPane.getViewport().getViewPosition().y + deltaY));`
* The dragging is more fidgety when moving the mouse slowly, while big movements are more smooth
* I tried using scrollRectToVisible without luck