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我正在为 Java 中的 2d 平台游戏制作基本大纲......我遇到了一个最近开始的问题！有时，当我运行我的程序时，我的框架出现了，一切都设置好了，你可以看到那个人，但由于某种原因，地面没有被“添加”（我有一个 addGround() 方法，我在运行的第一段）。随着我对游戏的深入了解，这种情况开始越来越多地发生，直到现在，大部分时间它都失败了，不会显示/添加地面！但是，有时它可以完美地完成。

这是它工作时的样子：

这是它在大多数时候的样子，当它不起作用时：

所以，这是我的主要类代码：（我没有包括所有的导入和东西，只是核心）

    public BusiWorld()
    {
        this.setFocusable(true);
        if(init)
        {
            ground.addGround(x-300, y+100, 35, 1);
            ground.addGround(x-100, y-360, 1, 46);
            ground.addGround(x+100, y+90, 1, 1);
            ground.addGround(x+400, y+20, 2, 1);
            ground.addGround(x+460, y-50, 2, 1);
            ground.addGround(x+520, y-120, 2, 1);
            ground.addGround(x+460, y-190, 2, 1);
            ground.addGround(x+140, y-260, 15, 1);
            ground.addGround(x, y-280, 1, 1);
            init = false;
        }
        t = new Timer(16, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent ae) {
                repaint();
            }
        });
        t.start();
    }
    public static void main(String[] args)
    {
        mainFrame.setTitle("Busiworld");
        mainFrame.setSize(600,500);
        mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        mainFrame.setBackground(Color.WHITE);
        mainFrame.setResizable(false);
        mainFrame.setVisible(true);
    }
}

这是地面类代码：

public class Ground extends JFrame
{
    private Image groundImg = Toolkit.getDefaultToolkit().getImage("ground.png");
    private ArrayList<Point> groundLocs = new ArrayList<Point>();
    public Ground()
    {

    }
    public void addGround(int xCoord, int yCoord, int howManyWide, int howManyTall)
    {
    for(int i = 0; i < howManyWide; i++)
    {
        for(int j = 0; j < howManyTall; j++)
        {
            groundLocs.add(new Point(xCoord+i*groundImg.getWidth(null), yCoord+j*groundImg.getHeight(null)));
        }
    }
    }
    public void drawGround(Graphics g)
    {
        for(Point p: groundLocs)
        {
            g.drawImage(groundImg, p.x, p.y, this);
        }
    }
    public int groundArraySize()
    {
        return groundLocs.size();
    }
    public Point getGroundArray(int index)
    {
        return groundLocs.get(index);
    }
}
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1 回答 1

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This is JFrame from Swing? I don't see invokeLater() for example when you call repaint(). Not managing the threads properly in a Swing application can make all sorts of things go wrong. Given the amount of code you've posted, I suggest you deal with threading first - then you can narrow-down your issue if it's still present.

Here's a tutorial on how to manage threads in Swing.

Edit:

Basically, anything that modified or causes any drawing to happen must occur before the Swing components are initialised, or on the event-dispatch thread. Code in an event listener or called through invokeLater() or invokeAndWait() is run on the event-dispatch thread. The code in your Timer is not called on the event-dispatch thread but does interact with the Swing component, so could make all sorts of things go wrong (such as erasing half your drawing).

于 2012-07-07T17:06:22.683 回答