private void drawEngineButton(Graphics g, int panelWidth, int panelHeight) {
int x = panelWidth - EngineButtonRadius - EngineButtonMargin;
int y = panelHeight - EngineButtonRadius - EngineButtonMargin;
if (in.getEngineToggleButtonState()) g.setColor(Color.GREEN);
else g.setColor(Color.RED);
g.fillOval(x, y, EngineButtonRadius, EngineButtonRadius);
g.setColor(Color.DARK_GRAY);
g.drawOval(x, y, EngineButtonRadius, EngineButtonRadius);
}
