FogOfWar | War plugin for Unreal Engine | Plugin library

but I'm struggling to understand how to properly double buffer in order to remove flickering

I just want to make one thing very clear. When custom painting is done correctly, Swing components are automatically double buffered.

Calling super.paint in movePlayer is an inappropriate abuse of the painting system.

Don't use getGraphics, this is not how custom painting works. Also, don't dispose of a Graphics context you didn't create, this can actually prevent components which are schedule to painted after yours from been painted.

Swing uses a passive rendering algorithm, this means that it will schedule painting to occur when ever it decides it needs to be done. You don't have control over it, the best you can do is provide "hints" to the system that you would like a component or some part of the component repainted (ie repaint). The painting subsystem will then decide when and what should be painted. Your components will be requested to perform a paint operation via their paint methods.

When done this way, Swing will double buffer the paint operation, so all components been painted are buffered and when the paint pass is complete, the image updated to the screen

I would, highly recommend, reading through:

• Performing Custom Painting
• Painting in AWT and Swing

for more details about how the painting system works in Swing and how you are expected to work with it

As a side note, I would also avoid loading resources (or performing any time consuming tasks) in any paint functionality. Painting should run as fast as possible