Java图像显示问题

Question

亲爱的 stackoverflow 的好人

我的一群 friend 正在尝试用 Java 制作关卡编辑器。

我们有一个 Jpanel 而不是 Jframe，我们正在尝试从保存为字符串的文件路径将小图像放到 Jpanel 上。最后，我们想要一个您可以直接拖放的图像列表。到目前为止，我们已经尝试了几种方法，但都没有成功。

我们可以加载图像，但是我们无法让这些图像实际显示，解决上述问题的最佳方法是什么？

下面是我们目前所拥有的示例。

EnemyPlacementGrid = new JPanel();
EnemyPlacementGrid.addMouseListener(new MouseAdapter() {
    //@Override
    public int mouseX;
    public int mouseY;
    public void mouseClicked(MouseEvent arg0) { //what happens when you click in the EnemyPlacementGrid
        System.out.println("Correct Area for placement");
        mouseX = arg0.getX();
        mouseY = arg0.getY();
        //System.out.println("X:" + mouseX + ", Y:" + mouseY );
        Enemy newEnemy = workingEnemy.cloneSelf();
        newEnemy.setLocation(mouseX, mouseY);
        System.out.println("newEnemy object: " + newEnemy);
        System.out.println(newEnemy.weaponList);
        currentWave.addEnemy(newEnemy);
        System.out.print(currentLevel);
    }
});

非常感谢任何帮助。

更新:

截至目前，我有一张图片出现，但我无法更新该图片。注意代码如下:

public void run() {
                try {
                     BufferedImage img = ImageIO.read(new File(IMG_PATH));
                     ImageIcon icon = new ImageIcon(img);
                     WaveScreen frame = new WaveScreen();

                     JPanel panel = (JPanel)frame.getContentPane();  
                     JLabel label = new JLabel();  
                     label.setIcon(new ImageIcon("images/map_on.png"));// your image here  
                     panel.add(label);  


                    frame.setVisible(true);
                    panel.add(label);
                    panel.repaint(); 

                } catch (Exception e) {
                    e.printStackTrace();
                } 

更新，从评论中尝试的方法:

Graphics2D g = null;
                        Graphics2D g2 = (Graphics2D)g;
                        Image imageVariable = new ImageIcon("images/map_on.png").getImage();
                       g.drawImage(imageVariable, mouseX, mouseY, null);

Answer 1

好吧，我想尝试使用 Graphics，这意味着您需要覆盖 paint 方法；我建议您将 mouseX 和 mouseY 作为全局变量……

// creating global image variable for use later
Image imageVariable = new ImageIcon("image path").getImage();

public void paintComponent(Graphics g) {
   // here you could either create a Graphics2D object
   // Graphics2D g2 = (Graphics2D)g;
   // or you could use the g parameter as it is, doesn't matter.
   // use the global variable for the image to be drawn onto the screen
   // use the global value of the mouseX and mouseY for where you click the mouse
   // to place the image, and this should be it 
   g.drawImage(imageVariable, mouseX, mouseY, null);
}

希望这对您有所帮助!