屏幕滚动，整图滚动

  int lev = 1 ;
  Image map_image , map_back1 , map_back11 ;
  Image map_image1 ;
  int map_image_Width , map_image_Height ;
  int map_back1_Width , map_back1_Height ;
  int map_back11_Width , map_back11_Height ;
  public void loading( int le ) throws Exception {
    // le = 2;
    // this.level = le;
    //level = 1;

    map_image = getImage( "/map/Level" + le + ".png" ) ;
    map_image1 = getImage( "/map/Level" + le + ".png" ) ;
    map_back1 = getImage( "/map/Level" + le + le + ".png" ) ;
    map_back11 = getImage( "/map/Level" + le + le + le + ".png" ) ;
    System.out.println( "loading map ..." ) ;
    scrollleft = this.width() - map_image.getWidth() ;
    drawX = 0 ; //getWidth();
    drawY = height() ;
    System.gc() ;
  }

////////////////////////////////////

  void drawMap() {
    drawMap_back() ;
    drawMap_back1() ;
    drawMap_back11() ;
    //System.gc();
  }

  void drawMap_back() {
    g.drawImage( map_image , -start_1 , drawY , Graphics.BOTTOM | Graphics.LEFT ) ;
    g.drawImage( map_image , -start_1 + 176 , drawY ,
   Graphics.BOTTOM | Graphics.LEFT ) ;
    this.scroll( 1 ) ;
    //   System.out.println("count  + " + count);
  }

  void drawMap_back1() {
    g.drawImage( map_back1 , -start_2 , drawY , Graphics.BOTTOM | Graphics.LEFT ) ;
    g.drawImage( map_back1 , -start_2 + 176 , drawY ,
   Graphics.BOTTOM | Graphics.LEFT ) ;
    this.scroll2( 2 ) ;
  }

  void drawMap_back11() {
    dx2 = drawX + map_back11.getWidth() ;
    g.drawImage( map_back11 , -start_3 , drawY ,
   Graphics.BOTTOM | Graphics.LEFT ) ;
    g.drawImage( map_back11 , -start_3 + 176 , drawY ,
   Graphics.BOTTOM | Graphics.LEFT ) ;
    this.scroll3( 10 ) ;
  }

  int start_1 = 0 ;
  int start_2 = 0 ;
  int start_3 = 0 ;
  int count = 0 ;
  public int next = 0 ;
  protected int scroll( int sc ) {
    if ( isleft ) {
      start_1 += sc ;
      if ( start_1 >= 176 ) {
 start_1 = 0 ;
      }
    }
    next = count++ ;
    return next ;
  }

  protected void scroll2( int sc ) {
    if ( isleft ) {
      start_2 += sc ;
      if ( start_2 >= 176 ) {
 start_2 -= 176 ;
      }
    }
  }

  protected void scroll3( int sc ) {
    if ( isleft ) {
      start_3 += sc ;
      if ( start_3 >= 176 ) {
 start_3 -= 176 ;
      }
    }
  }