讨论一下关于用JAVA作动画的问题？

Question

就是在Applet中两个图片进行碰撞检测。

Answer 1

我不太清楚JAVA画图是怎么画的。。
但我这里有需要考虑的问题，
一：UPDATE是是对当前的球重新画还是对于怎么图象重新画
反正我的意思就是要同步，不是对当前球的检测，要对整个系统的检测。球2的坐标也要是它真实的坐标。

Answer 2

有没有人能帮我看一下一个程序？yulin001122() 有没有兴趣？可能有点长。

Answer 3

import java.awt.*;
import java.applet.*;
import java.awt.event.*;public class ScrollScreen extends Applet implements Runnable,KeyListener
{
   int          AppletWidth,AppletHeight,ImageWidth,X1,X2,key,X,Y,ImageX,ImageY,ox;
   Image        scrollImage,scrollImage2,OffScreen, UFO,air;
   Image[]      bs=new Image[20];
   Thread       newThread; 
   Graphics     drawOffScreen;
   MediaTracker MT;   ImageSprite  plane;
   BulletSprite[] bullet=new BulletSprite[20];
   enemyPlane   EP;   public void init()
   {
      AppletWidth  = getSize().width;
      AppletHeight = getSize().height;
      MT           = new MediaTracker(this);
      scrollImage  = getImage(getDocumentBase(),"Images/scroll.gif"); 
      UFO = getImage(getDocumentBase(),"Images/6.gif");
      air = getImage(getDocumentBase(),"Images/AIRPLANE.gif");
      for(int i=0;i<20;i++)
         bs[i]  = getImage(getDocumentBase(),"Images/BULLET.gif");       MT.addImage(scrollImage,0); 
      MT.addImage(UFO,0);
      MT.addImage(air,0);
      for(int i=0;i<20;i++)
         MT.addImage(bs[i],0);      addKeyListener(this);      try
      {
         MT.waitForAll();
      }      
      catch(InterruptedException E){ }      scrollImage2 = createImage(scrollImage.getSource());      ImageWidth   = scrollImage.getWidth(this);      X1           = 0;               
      X2           = ImageWidth;     
       
      OffScreen     = createImage(AppletWidth,AppletHeight);
      drawOffScreen = OffScreen.getGraphics();      plane = new ImageSprite(air,this);
      EP    = new enemyPlane(UFO,this);
      for(int i=0;i<20;i++)
         bullet[i] = new BulletSprite(bs[i],this,AppletWidth,AppletHeight);   }   public void start()                
   {
      newThread = new Thread(this);   
      newThread.start();
   }   public void stop()         
   {
      newThread = null;        
   }   public void paint(Graphics g)
   {      drawOffScreen.clearRect(0,0,AppletWidth,AppletHeight);
      drawOffScreen.drawImage(scrollImage,X1,0,this);
      drawOffScreen.drawImage(scrollImage2,X2,0,this);
      plane.paintSprite(drawOffScreen,this);
      //EP.paintSprite(drawOffScreen,this);
      for(int i=0;i<20;i++)
         bullet[i].paintSprite(drawOffScreen,this);
      EP.paintSprite(drawOffScreen,this);
                 
      g.drawImage(OffScreen,0,0,this); 
   }   public void update(Graphics g)    
   {
      paint(g);                 
   }   public void run()
   {
      while(newThread != null)
      {
         repaint();                     try
         {
            Thread.sleep(10);    
         }
         catch(InterruptedException E){ }
         EP.updateState();         for(int i=0;i<20;i++)
            bullet[i].updateState(EP);          if(X1 == - AppletWidth)
         {
            X1 = - 1;
         }
         else
         {
            X1--;
         } 
         if(X2 == 0)
         {
            X2 = ImageWidth - 1;
         }
         else
         {
            X2--;
         }
         if((bullet[0].X+getWidth()>=EP.getX())&&(bullet[0].Y+bullet[0].getHeight()>=EP.getY())&&(EP.getX()+EP.getWidth()>=bullet[0].X)&&(EP.getY()+EP.getHeight()>=bullet[0].Y))
         {
            bullet[0].setVisible(false);
            bullet[0].setMove(false);
            EP.setVisible(false);
         } 
      }
   }
    
   public void keyTyped(KeyEvent e){}   public void keyReleased(KeyEvent e){}     public void keyPressed(KeyEvent e)
   {
      key=e.getKeyCode();
      if(key==e.VK_RIGHT)
      {
         plane.X+=3;
      }
      if(key==e.VK_LEFT)
      {
         plane.X-=3;
      }
      if(key==e.VK_UP)
      {
         plane.Y-=3;
      }
      if(key==e.VK_DOWN)
      {
         plane.Y+=3;
      }
      if(key==e.VK_SPACE)
      {
         if(ox==19)
         {
            bullet[ox].setLocation(plane.X+60,plane.Y+40);
            bullet[ox].setVisible(true);
            bullet[ox].setMove(true);
            ox=0;
         }
         else
         {
            bullet[ox].setLocation(plane.X+60,plane.Y+40);
            bullet[ox].setVisible(true);
            bullet[ox].setMove(true);
            ox++;
         }
      }                 
   }  
}

Answer 4

class enemyPlane  
{
   int     X=450,Y=50,width,height;
   boolean visible,active;
   Image  SpriteImage;           
   Applet Game;                  
  
   public enemyPlane(Image SpriteImage,Applet Game)
   {
      this.SpriteImage   = SpriteImage;
      this.Game          = Game;
            
      setLocation(450,50);         
      setVisible(true);        
      setMove(true);         
   }   public int getX()
   {
      return X;
   }   public int getY()
   {
      return Y;
   }   public void setLocation(int X,int Y)
   {
      this.X = X;
      this.Y = Y;
   }   public int getWidth()
   {
      return width;
   }   public int getHeight()
   {
      return height;
   }   public void setSize(int width,int height)
   {
      this.width  = width;
      this.height = height;
   }   public boolean canVisible()
   {
      return visible;
   }   public void setVisible(boolean v)
   {
      visible = v;
   }   public boolean canMove()
   {
      return active;
   }   public void setMove(boolean m)
   {
      active = m;
   }   public void updateState()
   {
      X-=1;
   }   public void paintSprite(Graphics g,Applet Game)  
   {
      if(visible == true)      
         g.drawImage(SpriteImage,450,50,Game);  
   }
}class BulletSprite 
{
   int     X,Y,width,height;
   boolean visible,active;
   int AppletWidth,AppletHeight;
   Image  SpriteImage;    public BulletSprite(Image bullet,Applet Game,int AppletWidth,int AppletHeight)
   {           
      this.SpriteImage  = bullet;
      this.AppletWidth  = AppletWidth;
      this.AppletHeight = AppletHeight;      setVisible(false);          
      setMove(false);             
   }   public int getX()
   {
      return X;
   }   public int getY()
   {
      return Y;
   }   public void setLocation(int X,int Y)
   {
      this.X = X;
      this.Y = Y;
   }   public int getWidth()
   {
      return width;
   }   public int getHeight()
   {
      return height;
   }   public void setSize(int width,int height)
   {
      this.width  = width;
      this.height = height;
   }   public boolean canVisible()
   {
      return visible;
   }   public void setVisible(boolean v)
   {
      visible = v;
   }   public boolean canMove()
   {
      return active;
   }   public void setMove(boolean m)
   {
      active = m;
   }   public void updateState(enemyPlane ep)     
   {
      if(active == true)
      {
         if(X > AppletWidth)    
         {
            setVisible(false); 
            setMove(false);    
         }
         else
            X = X + 10;     
      }
      if((X+width>=ep.getX())&&(Y+height>=ep.getY())&&(ep.getX()+ep.getWidth()>=X)&&(ep.getY()+ep.getHeight()>=Y))
      {
         setVisible(false);
         setMove(false);
         ep.setVisible(false);
      }
   }   public void paintSprite(Graphics g,Applet Game)
   {
      if(visible == true)
         g.drawImage(SpriteImage,X,Y,Game);
   }
}class ImageSprite 
{
   int     X,Y,width,height;
   boolean visible,active;
   Image  SpriteImage;           
   Applet Game;                  
  
   public ImageSprite(Image SpriteImage,Applet Game)
   {
      this.SpriteImage   = SpriteImage;
      this.Game          = Game;
            
      setLocation(0,0);         
      setVisible(true);        
      setMove(true);         
   }   public void updateState()
   {
   }   public void paintSprite(Graphics g,Applet Game)  
   {
      if(visible == true)      
         g.drawImage(SpriteImage,X,Y,Game);  
   }   public int getX()
   {
      return X;
   }   public int getY()
   {
      return Y;
   }   public void setLocation(int X,int Y)
   {
      this.X = X;
      this.Y = Y;
   }   public int getWidth()
   {
      return width;
   }   public int getHeight()
   {
      return height;
   }   public void setSize(int width,int height)
   {
      this.width  = width;
      this.height = height;
   }   public boolean canVisible()
   {
      return visible;
   }   public void setVisible(boolean v)
   {
      visible = v;
   }   public boolean canMove()
   {
      return active;
   }   public void setMove(boolean m)
   {
      active = m;
   }
}

Answer 5

我觉得太长了。希望有同志能copy过去帮我看看。先谢过了。

Answer 6

因为我这里没有java 的运行环境拉。.
所以现在我只能提供你一点应该注意的地方 再说我对JAVA画图没有研究过..
所以我的意见你可以作为参考拉。....