Java fillOval将不会填充窗口

Question

** Please feel free to provide feedback on the process flow as well. There is probably a better way to complete what I'm doing, I'm just not aware of it.

I have a Game class which extends a JPanel. In the paintComponent() method it renders a different class based on the state of the game (menus). Only the welcome screen paints across the entire window. The others don't fill the window, even if I manually assign the coordinates of (0, 0, 1000, 1000) on a 640x480 window.

public void paintComponent(Graphics g) {
    super.paintComponent(g);

    if (state == State.WELCOME) {

        welcome.render(g);

    } else if (state == State.SELECTPOSITION) {

        selectPosition.render(g);

    } else if (state == State.SELECTSCENARIO) {

        selectScenario.render(g);
...

More states are listed with the same logic are listed under the selectScenario() line.

The render() methods of the first 2 are listed below:

welcome.render(g)

public void render(Graphics g) {
    g.setColor(Color.red);
    g.fillRect(0, 0, 640, 480);
    g.setColor(Color.white);
    g.drawString("Welcome", 50, 150);
}


selectPosition.render(g)

public void render(Graphics g) {
    g.setColor(Color.blue);
    g.fillRect(0, 0, 1000, 1000);
}

There is a red line approximately 50px high at the bottom of the screen during the SelectPosition screen.

Please let me know if you need more information. I attempted to share only relevant lines.

Any help is greatly appreciated.

Answer 1

We are unfamiliar with much of your code, your logic, and your program's structure, and you may wish to create and post an sscce to let us actually experience for ourselves what you are experiencing. But it sounds to me as if what you really want to do is swap views based on state such as can be accomplished using a CardLayout.