JFrame到图像而不显示JFrame [英] JFrame to image without showing the JFrame

问题描述

我试图将JFrame渲染到图像而不显示JFrame本身（类似于 this 问题是问）。我尝试过使用这段代码：

I am trying to render a JFrame to an image without ever displaying the JFrame itself (similar to what this question is asking). I have tried using this piece of code:

private static BufferedImage getScreenShot(Component component)
{
    BufferedImage image = new BufferedImage(component.getWidth(), component.getHeight(), BufferedImage.TYPE_INT_RGB);
    // call the Component's paint method, using
    // the Graphics object of the image.
    component.paint(image.getGraphics());
    return image;
}

但是，这只适用于 JFrame 的 setVisible（true）。这将导致图像显示在屏幕上，这不是我想要的。我也试图创建类似的东西：

However, this only works when the JFrame's setVisible(true) is set. This will cause the image to be displayed on the screen which is not something I want. I have also tried to create something like so:

public class MyFrame extends JFrame
{
    private BufferedImage bi;

    public MyFrame(String name, BufferedImage bi)
    { 
         this.bi = bi;
         super(name);
    }

    @Override
    public void paint(Graphics g)
    {
         g.drawImage(this.bufferedImage, 0, 0, null);
    }
}

然而，这会显示黑色图像（如上面的代码所示） 。我很确定我所追求的是可能的，问题是我无法真正找到。我对自定义Swing组件的体验非常有限，所以任何信息都将受到赞赏。

This however displays black images (like the code above). I am pretty sure that what I am after is possible, the problem is that I can't really find how. My experience with custom Swing components is pretty limited, so any information will be appreciated.

谢谢。

推荐答案

这是一个应该做的技巧片段：

Here is a snippet that should do the trick:

Component c; // the component you would like to print to a BufferedImage
JFrame frame = new JFrame();
frame.setBackground(Color.WHITE);
frame.setUndecorated(true);
frame.getContentPane().add(c);
frame.pack();
BufferedImage bi = new BufferedImage(c.getWidth(), c.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics = bi.createGraphics();
c.print(graphics);
graphics.dispose();
frame.dispose();

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