Game.java 文件源码

/**
 * Draw all game objects.
 */

private void onDraw() {
    BufferStrategy frameStrategy = frame.getBufferStrategy();
    if (frameStrategy == null) {
        // create the buffer strategy, its null.
        frame.createBufferStrategy(3);
        frameStrategy = frame.getBufferStrategy();
    }
    // clear and get our graphics object.
    graphics = frameStrategy.getDrawGraphics();
    graphics.clearRect(0, 0, width, height);

    if (showFPS) {
        graphics.setColor(Color.red);
        graphics.drawString(Integer.toString(fps) + " fps", 50, 50);
    }

    // update stack.
    stack.forEach(state -> state.onDraw(graphics));

    graphics.dispose();
    frameStrategy.show();

}