JButton正在绘制一幅图像 [英] JButton is drawing behind an image

问题描述

我正在制作一个起始屏幕，它正在运行得非常好，在启动时得到一个背景图像，现在我正在尝试在startmenu上绘制一个JButton，这是一个JFrame。但是当我运行程序时，按钮出现在背景图片后面。如果我将鼠标悬停在放置按钮的区域上方，则会闪烁，当我点击它时也会发生这种情况。有没有办法画出背景的按钮INFRONT？我在代码中将按钮作为最后一个。我的代码用于绘制背景和按钮：

I am making a starting screen, and it's working out pretty fine, got a background image when it starts, now I am trying to draw a JButton on the startmenu, which is a JFrame. But when I run my program, the button appears behind the background picture. If I hover above the area where the button is placed, it's flickering, and when I click it that happens too. Is there any way to draw the Button INFRONT of the background? I made the button as last in the code. My code to draw the background and button:

    public void drawStartScreen(){
    startScreenOn = true;
    Graphics2D b = buffer.createGraphics();
    b.setColor( Color.WHITE );
    b.fillRect(0, 0, 800, 600);
    b.drawImage(start,0,0,null);

    setLayout( null );
    button = new JButton("Start Game");
    button.setBounds(10,10,100,100);
    button.setVisible( true );
    add(button);
}

它首先绘制图像，然后是Button，但按钮仍然绘制图像背后。

It draws the image first, and then the Button, but the button still draws behind the image.

推荐答案

覆盖JFrame上的paint方法：

Override the paint method on the JFrame:

@Override
public void paint(Graphics g) {
    super.paint(g);
    Graphics2D b = (Graphics2D)g;
    b.setColor( Color.WHITE );
    b.fillRect(0, 0, 800, 600);
    b.drawImage(start.getImage(),0,0,null);
    b.dispose();        
}

请注意，这会调用 paint（） dispose（）执行c $ c>。我刚尝试了这段代码，它对我有用。

Notice that this calls paint() on the parent and dispose() on the graphics context when done. I just tried this code and it worked for me.

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