尝试在 OS X Mavericks 中绘制图形时 Java 崩溃

Question

我正在学习 Java 游戏开发教程，虽然这似乎适用于 Windows，但 Java 在我的 Macbook Pro 上崩溃并出现以下错误:

C [libGL Image.dylib+0x24221] storeColor+0x5d1

目前项目设置在eclipse中，有以下类:

游戏:

package Main;
/**
 * Created by beuden on 1/3/14.
 */

import javax.swing.JFrame;

public class Game {

     public static void main(String[] args)
     {

         JFrame window = new JFrame("Dragon Tale");
         window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         window.setContentPane(new GamePanel());
         window.setResizable(false);
         window.pack();
         window.setVisible(true);
     }
}

游戏面板:

package Main;

import GameState.GameStateManager;

import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.event.*;

/**
 * Created by beuden on 1/3/14.
 */
public class GamePanel extends JPanel implements Runnable, KeyListener{

// Dimensions
public static final int WIDTH = 320;
public static final int HEIGHT = 240;
public static final int SCALE = 2;
Dimension d = new Dimension(WIDTH*SCALE, HEIGHT*SCALE);

// game Thread
private Thread thread;
private boolean running;
private int FPS = 60;
private long targetTime = 1000 / FPS;

//image
private BufferedImage image;
private Graphics2D g;

// game state manager
private GameStateManager gsm;

public GamePanel()
{
    super();
    setPreferredSize(d);
    setMaximumSize(d);
    setMinimumSize(d);


    setFocusable(true);
    requestFocus();
}

public void addNotify()
{
    super.addNotify();
    if(thread == null)
    {
        thread = new Thread(this);
        addKeyListener(this);
        thread.start();
    }
}

public void init()
{
    image = new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB);
    g = (Graphics2D) image.getGraphics();
    running = true;

    gsm = new GameStateManager();



}

public void run()
{
    init();

    long start,elapsed,wait;
    long lastTime = System.nanoTime();
    double nsPerTick = 1000000000/60D;

    int frames = 0;
    int ticks = 0;

    long lastTimer = System.currentTimeMillis();
    double delta = 0; // Now many unprocessed nanoseconds have gone by so far.

    // Game Loop
    while(running)
    {


        long now = System.nanoTime();
        delta += (now - lastTime) / nsPerTick;
        lastTime = now;
        boolean shouldRender = false;

        while(delta >=1)
        {
            ticks++;
            update();
            delta -=1;
            shouldRender = true;
        }
        if(shouldRender)
        {
            frames++;
            draw();
            drawToScreen();
        }

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

    }
}

public void update()
{
    gsm.update();
}

public void draw()
{
   gsm.draw(g);
}

public void drawToScreen()
{
    Graphics g2 = getGraphics();
    g2.drawImage(image,0,0,(WIDTH * SCALE), (HEIGHT * SCALE), null);

    g2.dispose();
}

public void keyTyped(KeyEvent key){}
public void keyPressed(KeyEvent key){
    gsm.keyPressed(key.getKeyCode());
}
public void keyReleased(KeyEvent key){
    gsm.keyReleased(key.getKeyCode());
}
}

游戏状态:

package GameState;

import java.awt.*;

/**
 * Created by beuden on 1/3/14.
 */
public abstract class GameState {

    protected GameStateManager gsm;
    public abstract void init();
    public abstract void update();
    public abstract void draw(Graphics2D g);
    public abstract void keyPressed(int k);
    public abstract void keyReleased(int k);
}


package GameState;

import java.awt.*;
import java.util.ArrayList;

/**
 * Created by beuden on 1/3/14.
 */
public class GameStateManager {

private ArrayList<GameState> gameStates;
private int currentState;

public static final int MENUSTATE = 0;
public static final int LEVEL1STATE = 1;

public GameStateManager()
{
    gameStates = new ArrayList<GameState>();

    currentState = MENUSTATE;
    gameStates.add(new MenuState(this));

}

public void setState(int state)
{
    currentState = state;
    gameStates.get(currentState).init();
}

public void update()
{
    gameStates.get(currentState).update();

}

public void draw(Graphics2D g)
{
    gameStates.get(currentState).draw(g);
}

public void keyPressed(int k)
{
    gameStates.get(currentState).keyPressed(k);
}

public void keyReleased(int k)
{
    gameStates.get(currentState).keyReleased(k);
}
}

MenuState - 这是游戏可以处于的单一状态，还会有 1 级状态。

package GameState;

import java.awt.*;
import java.awt.event.KeyEvent;

import TileMap.Background;
/**
 * Created by beuden on 1/4/14.
 */
public class MenuState extends GameState {

private Background bg;

private int currentChoice = 0;
private String[] options = {
        "Start",
        "Options",
        "Quit"
};

private Color titleColor;
private Font titleFont;

private Font font;
public MenuState(GameStateManager gsm)
{
    this.gsm = gsm;

    try{
        bg = new Background("/Backgrounds/menubg.gif", 1);
        bg.setVector(-0.1, 0);

        titleColor = new Color(128,0,0);
        titleFont = new Font("Century Gothic", Font.PLAIN, 28);

        font = new Font("Ariel", Font.PLAIN, 12);
    }
    catch(Exception e){

    }
}

public void init(){}

public void update(){
    bg.update();
}

public void draw(Graphics2D g){
    //draw background
    bg.draw(g);

    //draw font
    g.setColor(titleColor);
    g.setFont(titleFont);
    g.drawString("Dragon Tale", 80, 70);

    //draw menu options
    g.setFont(font);

    for(int i = 0; i < options.length; i++)
    {
       if(i == currentChoice)
       {
           g.setColor(Color.BLACK);

       }
       else{
           g.setColor(Color.red);
       }
       g.drawString(options[i], 145, 140 + i* 15);
    }

}

public void select()
{
    if(currentChoice == 0)
    {
        //Start
    }
    if(currentChoice == 1)
    {
        //Options
    }
    if(currentChoice == 2)
    {
        //Quit
        System.exit(0);
    }

}
public void keyPressed(int k){
      if(k == KeyEvent.VK_ENTER)
      {
           select();
      }

      if(k == KeyEvent.VK_UP)
      {
          currentChoice--;
          if(currentChoice < 0)
          {
              currentChoice = options.length - 1;
          }
      }
      if(k == KeyEvent.VK_DOWN)
      {
          currentChoice++;
          if(currentChoice == options.length)
          {
              currentChoice = 0;
          }
      }
}
public void keyReleased(int k){}

}

和背景:

package TileMap;

import Main.GamePanel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;

/**
* Created by beuden on 1/4/14.
*/
public class Background {

private BufferedImage image;

private double x, y,dx,dy;

private double moveScale;

public Background(String s, double ms)
{
    try{
        image = ImageIO.read(getClass().getResourceAsStream(s));
    }
    catch(Exception e)
    {
        System.out.println("Unable to read image!!!");
        e.printStackTrace();
    }

    moveScale = ms;
}

public void setPosition(double x, double y)
{
    this.x = (x * moveScale)%GamePanel.WIDTH;
    this.y = (y * moveScale)%GamePanel.HEIGHT;
}

public void setVector(double dx, double dy)
{
    this.dx = dx;
    this.dy = dy;
}

public void update()
{
    x += dx;
    y += dy;
}

public void draw(Graphics2D g)
{
    g.drawImage(image, (int)x, (int)y, null);

    if(x < 0){
        g.drawImage(image, (int)x + GamePanel.WIDTH, (int)y, null);
    }
    if(x > 0){
        g.drawImage(image, (int)x - GamePanel.WIDTH, (int)y, null);
    }

}
}

问题出现在 GamePanel 类中。

下一行:

g2.drawImage(image,0,0,(WIDTH * SCALE), (HEIGHT * SCALE), null);

导致崩溃。但将其更改为:

g2.drawImage(image, 0,0,WIDTH,HEIGHT,null);

并且游戏呈现完美，尽管上面的测量值 (320,240) 使其变小但它会绘制。

我不确定为什么缩放会突然导致崩溃。即使是对任何变量的简单 +1 也会导致它崩溃。

如有任何帮助，我们将不胜感激。

Answer 1

我在 OS/X Mavericks 上调用 Graphics.drawImage() 时也遇到了同样的问题，并设法通过手动安装 JDK 1.6 并使用它而不是 1.7 运行我的代码来解决这个问题。

参见 how-do-i-install-jdk-1-6-in-mavericks有关如何执行此操作的说明。