Java: Make Draw-program run in fullscreen

Question

I am using the Draw.java class from the Princeton library for a small graphics program. Currently it runs in a window. I want to make it scaleable and full-screen. How can I achieve that? I looked into Full-Screen Exclusive Mode but am not quite sure on how to use it. I tried adding it into my program, but I can't seem to link the Draw-Window to the Full-Screen Frame, which leads to one window with the program and a blank full screen opening. I don't want to change my entire code using the Draw class unless it is necessary. Any ideas on how to make the Draw-Window Full-Screen?

Here is a code sample although I don't think it'll help much:

Draw draw = new Draw("TapReact");
int canvasWidth = 1350;
int canvasHeight = 800;
draw.setCanvasSize(canvasWidth, canvasHeight);

And and example for a full-screen implementation with Full-Screen Exclusive Mode:

GraphicsEnvironment graphicsEnvironment = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice graphicsDevice = graphicsEnvironment.getDefaultScreenDevice();
Window myWindow = new Window(new Frame());
graphicsDevice.setFullScreenWindow(myWindow);   

How can I link myWindow and draw, so that both display the same thing?

Help would be much appreciated, thank you.

Edit: I Already tried implementing a getFrame() method in Draw.java and using that frame with new Window(draw.getFrame()). I also tried implementing a setFullScreen() method in Draw.java which also didn't work.

Answer 1

UPDATED 2020-03-11

In Draw.java:

    private boolean isFullscreen = false;

  /**
  *  Sets the undecorated fullscreen mode.
  */
  public void setFullscreen() {
      isFullscreen = true;
      frame.dispose();
      frame = new JFrame();
      frame.setUndecorated(true);
      frame.setResizable(false);
      frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
      frame.setVisible(true);
      width = frame.getWidth();
      height = frame.getHeight();
      init();
  }

Also, you need to modify the second line of init() method in Draw.java:

  private void init() {
        if (frame != null) frame.setVisible(false);
        if (!isFullscreen) frame = new JFrame();  // This is the modified line
        offscreenImage = new BufferedImage(2*width, 2*height, BufferedImage.TYPE_INT_ARGB);
        onscreenImage  = new BufferedImage(2*width, 2*height, BufferedImage.TYPE_INT_ARGB);
        offscreen = offscreenImage.createGraphics();
        .........

Then in your test class:

    Draw draw = new Draw("TapReact");
    draw.setFullscreen();
    while (true) {
      if (draw.isMousePressed() &&
          draw.mouseX() > 0.4 &&
          draw.mouseX() < 0.6 &&
          draw.mouseY() > 0.4 &&
          draw.mouseY() < 0.6) {
        draw.setPenColor(Draw.RED);
      } else {
        draw.setPenColor(Draw.BLACK);
      }
      draw.filledSquare(0.5, 0.5, 0.1);
    }