.png 文件的 drawImage() 在 Java 小程序中不起作用？

发布于 2024-07-14 15:57:13 字数 1477 浏览 4 评论 0原文

我使用小程序制作了这个吃豆人游戏。当小程序完成加载时，它会显示我制作的“开始菜单”图形，其中显示“双击开始游戏”等。该图形将占据整个 400x400 小程序。代码如下：

public void paint(Graphics g)
{
    if (! isRunning)
    {
        switch (result)
        {
            case 0:
                showStartScreen(g);
            break;

            case 1:
                showWonScreen(g);
            break;

            case -1:
                showLostScreen(g);
            break;
        }
        return;
    }
      //Code for rendering other stuff if game is here
}

showStartScreen：

public void showStartScreen(Graphics g)
{
    Image intro=img.getImg("pacman-intro.png");
    g.drawImage(intro, 0, 0, this);

}

当我在 Eclipse 上本地运行此代码时，效果很好，但在 Web 浏览器中，加载小程序时，我只看到一个空白框，其中之前是 java 的加载动画。令人惊讶的是，如果我随机双击小程序所在的位置，游戏就会启动并正常运行。所以这让我认为问题只是使用 drawImage 绘制 .png 文件。

当你赢得或输掉游戏时，也会发生同样的事情，它只是挂起，而不是绘制它需要的图形。

你可以在这里看到这个（你可以使用箭头键来控制）

PS我这里使用的是双缓冲。

有什么想法吗..？

编辑：用于加载 img 的 ImgHelper 类的代码：

import java.awt.Image;
import java.net.URL;

import javax.swing.ImageIcon;

public class ImgHelper
{
    public Image getImg(String file)
    {
            //Engine is the name of the base applet class
        URL url=Engine.class.getClassLoader().getResource("assets/" + file);
        return new ImageIcon(url).getImage();

    }


}

原文

I made this pacman game using an applet. When the applet finishes loading, it is meant to display a 'start menu' graphic i made which says 'Double click to start the game', etc. The graphic would take up the whole 400x400 applet. Here's the code:

public void paint(Graphics g)
{
    if (! isRunning)
    {
        switch (result)
        {
            case 0:
                showStartScreen(g);
            break;

            case 1:
                showWonScreen(g);
            break;

            case -1:
                showLostScreen(g);
            break;
        }
        return;
    }
      //Code for rendering other stuff if game is here
}

showStartScreen:

public void showStartScreen(Graphics g)
{
    Image intro=img.getImg("pacman-intro.png");
    g.drawImage(intro, 0, 0, this);

}

This works fine when I run this locally on Eclipse, but in the web browser, when the applet is loaded I just see a blank box where the java's loading animation previously was. Surprisingly, if I double click randomly where the applet is meant to be, the game starts and works as normal. So this makes me think that the problem is just with drawing .png files using drawImage.

The same thing occurs when you win or lose the game,it just hangs instead of drawing the graphic it needs to.

You can see this here (you can use arrow keys to control)

P.S I am using double buffering here.

Any thoughts..?

EDIT: Code for ImgHelper class which is used to load the img:

import java.awt.Image;
import java.net.URL;

import javax.swing.ImageIcon;

public class ImgHelper
{
    public Image getImg(String file)
    {
            //Engine is the name of the base applet class
        URL url=Engine.class.getClassLoader().getResource("assets/" + file);
        return new ImageIcon(url).getImage();

    }


}

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