animatedimage.java.svn-base

来自「example2 众多JAVA实例源码...学习java基础的好帮手」· SVN-BASE 代码 · 共 88 行

package opusmicro.demos.animate;

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 );
	}
}