protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics gg = g.create();
if (trainNumber < 0) return;
TrainModel tm = (TrainModel) w.get(KEY.TRAINS, trainNumber, modelRoot.getPlayerPrincipal());
trainModelViewer.setTrainModel(tm);
int waterRemaining = trainModelViewer.getWaterRemaining();
int maxWater =
((EngineType) w.get(KEY.ENGINE_TYPES, tm.getEngineType(), Player.AUTHORITATIVE))
.getWaterCapacity();
// draw a dark-blue rectangle and a light blue rectangle
gg.setColor(Color.BLUE);
gg.fillRect(0, 0, getWidth() * waterRemaining / maxWater, getHeight());
}
