Here are some ideas.
a. On start, it draws 3 circles on screen (either thro drawoval or by loading a circle image).
sounds like you probably already know how to do this. if not, check out the
Graphics API b. Draws lines between the circles.
again, see the methods of the
Graphics API.
c. Now I should be able to drag and move any of the circles at a time around the screen and it creates new lines
I hear that
java supports drag and drop guis, though have never done this myself. You could [URL=http://www.google.com/search?q=java+drag+and+drop&sourceid=mozilla-search&start=0&start=0&ie=utf-8&oe=utf-8&client=firefox-a&rls=org.mozilla:en-US
fficial]google for info on this[/URL].
Alternatively, you could implement your own drag and drop operations. You would need, at a minimum:
-A datastructure modeling the circles you've drawn on the screen and their current locations.
- A datastructure modeling the end points of lines between circles.
- Mouse listeners that use the first datastructure to determine whether you've clicked in a circle and use the second data structure to update the lines between the circles.