gpan | Streetview Panorama downloader | Download Utils library

A couple of problems I noticed.

1. When you call main in TryGraph, you create a new instance. But you already have an instance of TryGraph when the button was pressed.

2. Don't extend JFrame. It's bad practice. Just create an instance of it.

3. Only use one static main entry point.

4. The big problem is that you put repaint() in a tight loop. Don't do that. Just call repaint(). Remember that repaint is run on the Event Dispatch Thread. So if that thread is tied up, nothing else will work.

5. Don't dispose of your graphics context. You can do that if you create a new one but otherwise don't get rid of it.

6. Finally, put super.paintComponent() as the first statement in your JPanel paintComponent method.

I suggest you read about painting and the EDT in the Java Tutorials.

Here is the modified code, all in one file.