BufferedImage为什么会这样？

Question

我要发布代码。它不是太复杂或太长。我只是不明白为什么它有效。

在下面的代码中，图像在渲染方法中呈现，但在游戏循环中不会更新。我无法弄清楚图像是如何更新的。代码运行，输出显示更改的移动颜色。我看到tick方法更新了pixels[]数组，但即使在循环之外，像素也被设置为等于来自图像的数据。如何改变pixels[]改变图像。请帮我理解这段关系。

如果我发布的帖子不对，我很抱歉。我做了搜索，但大多数人似乎有一个问题，它不起作用。我的工作正常。我只需要了解原因。图像未在tick方法中更新。像素是。那么为什么图像变化好像它以某种方式连接到pixels[] ???

我的代码如下：

package com.channelsplace.game;

import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;

import javax.swing.JFrame;

import com.channelsplace.game.gfx.SpriteSheet;

public class Game extends Canvas implements Runnable
{
    private boolean running;
    private static final long serialVersionUID = 1L;
    public static final int WIDTH = 160;
    public static final int HEIGHT = WIDTH / 12*9;
    public static final int SCALE = 3;
    public static final String NAME = "Game";
    private JFrame frame;
    public int tickCount = 0;
/**********************************************************************
The next two lines are part of what I don't get.
below this you'll see a tick method that updates the pixels array
and a render method that renders image. but no overt flow of information 
from pixels to image.
**********************************************************************/ 
private BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
    private int[] pixels = ((DataBufferInt) image.getRaster().getDataBuffer()).getData();
    private SpriteSheet spriteSheet = new SpriteSheet("/sprite_sheet.png");

    public Game()
    {
        setMinimumSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
        setMaximumSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
        setPreferredSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
        frame = new JFrame(NAME);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());
        frame.add(this, BorderLayout.CENTER);
        frame.pack();
        frame.setResizable(false);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);

    }

    public synchronized void start()
    {
        running = true;
        new Thread(this).start();
    }
    public synchronized void stop()
    {
        running = false;
    }

    public void run() 
    {
        long lastTime = System.nanoTime();
        double nsPerTick = 1000000000D/60D;
        int ticks = 0;
        int frames = 0;
        long lastTimer = System.currentTimeMillis();
        double delta = 0;
        boolean shouldRender = true;        
        while(running)
        {
            long now = System.nanoTime();
            delta += (now - lastTime) / nsPerTick;
            lastTime = now;

            if (delta >= 1)             
            {
                ticks++;
                tick();
                delta -= 1;
                shouldRender = true;
            }

            try {
                Thread.sleep(2);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            if (shouldRender)
            {
                frames++;
                render();
                shouldRender = false;
            }


            if (System.currentTimeMillis()-lastTimer>=1000)
            {
                lastTimer += 1000;
                System.out.println(frames+" , "+ticks);
                frames = 0;
                ticks = 0;
            }
        }

    }

    public void tick()
    {
        tickCount++;
        for (int i = 0; i < pixels.length; i++)
        {
            pixels[i] = i + tickCount;
        }
    }

    public void render()
    {
        BufferStrategy bs = getBufferStrategy();
        if (bs == null)
        {
            createBufferStrategy(3);
            return;
        }
        Graphics g = bs.getDrawGraphics();
        g.drawImage(image, 0, 0, getWidth(), getHeight(),null);
        g.dispose();
        bs.show();

    }
    public static void main(String[] args) 
    {
        new Game().start();

    }
}

//thanks for reading

Answer 1

另一答案