JPanel背景图片

发布于 2024-09-03 03:43:23 字数 548 浏览 5 评论 0原文

这是我的代码，它确实找到了图像，所以这不是我关心的，我关心的是如何使该图像成为面板的背景。我正在尝试使用图形，但我不工作，有什么想法吗？请？？

try {
            java.net.URL imgURL = MAINWINDOW.class.getResource(imagen);

            Image imgFondo = javax.imageio.ImageIO.read(imgURL);
            if (imgFondo != null) {
                Graphics grafica=null;
                grafica.drawImage(imgFondo, 0, 0, this);
                panel.paintComponents(grafica);
            } else {
            System.err.println("Couldn't find file: " + imagen);
            }

        } catch...

原文

This is my code, it indeed finds the image so that is not my concern, my concern is how to make that image be the background of the panel. I'm trying to work with Graphics but i doesnt work, any ideas?? please??

try {
            java.net.URL imgURL = MAINWINDOW.class.getResource(imagen);

            Image imgFondo = javax.imageio.ImageIO.read(imgURL);
            if (imgFondo != null) {
                Graphics grafica=null;
                grafica.drawImage(imgFondo, 0, 0, this);
                panel.paintComponents(grafica);
            } else {
            System.err.println("Couldn't find file: " + imagen);
            }

        } catch...

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笑红尘 2024-09-10 03:43:23

您的代码此处有错误。您可以在取消引用该行之前将其 grafica 设置为 null。这肯定会抛出NullPointerException。您不应声明自己的 Graphics 对象，而应使用传递给将用于绘画的方法的对象。要在 Swing 中执行此操作，您应该实现 paintComponent 方法来绘制图像，如下所示：

  public void paintComponent(Graphics grafica) {
     grafica.drawImage(imgFondo, 0, 0, this); 
  }

请注意，您不希望执行长时间运行的任务，例如从磁盘中读取图像文件绘画线。上面的示例假设您已经加载了 imgFondo 并将其存储起来，以便可以在 paintComponent 方法中访问它。

There is an error in your code here. You set your grafica to null the line before you dereference it. This will certainly throw a NullPointerException. Instead of declaring your own Graphics object, you should use the one passed in to the method you will be using for painting. To do this in Swing, you should implement the paintComponent method to paint your image, something like this:

  public void paintComponent(Graphics grafica) {
     grafica.drawImage(imgFondo, 0, 0, this); 
  }

Note that you don't want to be doing long running tasks like reading in Image files from disk in the painting thread. The above example assumes that you have already loaded the imgFondo and have it stored such that it is accessible in the paintComponent method.

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