import java.util.*;
import javax.microedition.lcdui.*;
// 定义了一个动画，该动画其实只是一系列相同大小的图片
// 轮流显示，然后模拟出的动画
public class animatedimage extends timertask {;
private canvas canvas;
private image[] images;
private int[][] cliplist;
private int current;
private int x;
private int y;
private int w;
private int h; // construct an animation with no canvas. public animatedimage( image[] images ){;
this( null, images, null );
}; // construct an animation with a null clip list. public animatedimage( canvas canvas, image[]
images ){; this( canvas, images, null );
}; // construct an animation. the canvas can be null,
// but if not null then a repaint will be triggered
// on it each time the image changes due to a timer
// event. if a clip list is specified, the image is
// drawn multiple times, each time with a different
// clip rectangle, to simulate transparent parts. public animatedimage( canvas canvas, image[] images,
int[][] cliplist ){;
this.canvas = canvas;
this.images = images;
this.cliplist = cliplist; if( images != null && cliplist != null ){;
if( cliplist.length < images.length ){;
throw new illegalargumentexception();
};
}; if( images != null && images.length > 0 ){;
w = images[0].getwidth();
h = images[0].getheight();
};
}; // move to the next frame, wrapping if necessary. public void advance( boolean repaint ){;
if( ++current >= images.length ){;
current = 0;
}; if( repaint && canvas != null && canvas.isshown()
){;
canvas.repaint( x, y, w, h );
canvas.servicerepaints();
};
}; // draw the current image in the animation. if
// no clip list, just a simple copy, otherwise
// set the clipping rectangle accordingly and
// draw the image multiple times. public void draw( graphics g ){;
if( w == 0 h == 0 ) return; int which = current; if( cliplist == null cliplist[which] == null
){;
g.drawimage( images[which], x, y,
g.top g.left );
}; else {;
int cx = g.getclipx();
int cy = g.getclipy();
int cw = g.getclipwidth();
int ch = g.getclipheight(); int[] list = cliplist[which]; for( int i = 0; i + 3 <= list.length; i +=
4 ){;
g.setclip( x + list[0], y + list[1],
list[2], list[3] );
g.drawimage( images[which], x, y,
g.top g.left );
}; g.setclip( cx, cy, cw, ch );
};
}; // moves the animation's top left corner. public void move( int x, int y ){;
this.x = x;
this.y = y;
}; // invoked by the timer. advances to the next frame
// and causes a repaint if a canvas is specified. public void run(){;
if( w == 0 h == 0 ) return; advance( true );
};
}; | 
