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Why not use them in parallel ?

At the beginning its a little bit of effort,
but once you learned the layout of a project of the two IDEs on your disk
you can use the power of both easily.
That's already very much of the game.

If you have some more 'courage' get into the 'ant' tool and you are probably
almost a java (developer tools) Pro !

-do you use new() operator inside paintComponent(Graphics g), if so try to avoid this use preallocation wherever possible
-if you use composites this slows down too
-a VolatileImgage can get lost and should be checked for validity inside drawing, like here:
http://download.oracle.com/javase/6/docs/api/java/awt/image/VolatileImage.html
-instead of VolatileImage it is often recommended to use BufferStrategy:
http://download.oracle.com/javase/6/docs/api/java/awt/image/BufferStrategy.html
http://gpwiki.org/index.php/Java:Tutorials:Double_Buffering

for new coordinates in new resolution:

x_new  =  positionOld_X / resolutionOld_X * resolutionNew_X;
y_new  =  positionOld_Y / resolutionOld_Y * resolutionNew_Y;

in your example (use double, not int):

positionOld_X = 200.0;
positionOld_Y = 220.0;
resolutionOld_X = 800.0;
resolutionOld_Y = 600.0;
resolutionNew_X = 1024.0;
resolutionNew_Y = 768.0;

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