protected void preCache(List<Position> grid, Position centerPosition) throws InterruptedException { // Pre-cache the tiles that will be needed for the intersection calculations. double n = 0; final long start = System.currentTimeMillis(); for (Position gridPos : grid) // for each grid point. { final double progress = 100 * (n++ / grid.size()); terrain.cacheIntersectingTiles(centerPosition, gridPos); SwingUtilities.invokeLater( new Runnable() { public void run() { progressBar.setValue((int) progress); progressBar.setString(null); } }); } SwingUtilities.invokeLater( new Runnable() { public void run() { progressBar.setValue(100); } }); long end = System.currentTimeMillis(); System.out.printf( "Pre-caching time %d milliseconds, cache usage %f, tiles %d\n", end - start, terrain.getCacheUsage(), terrain.getNumCacheEntries()); }