/*
 * AnimeCanvas.java
 *
 * Copyright 2001 SkyArts. All Rights Reserved.
 */
import javax.microedition.lcdui.*;

/**
 * Anime的描繪與操作所用的類(lèi)
 *
 * @author  Hideki Yonekawa
 * @version 1.0
 */
class AnimeCanvas extends Canvas implements Runnable {
	/** 儲(chǔ)存動(dòng)畫(huà)的圖像Index的變量 */
	private int				imgInx;

	/** 儲(chǔ)存動(dòng)畫(huà)的圖像的變量 */
	private Image[]			imgs;

	/** 用來(lái)將動(dòng)畫(huà)描繪線(xiàn)程停止的標(biāo)志變量 */
	private boolean			isStopped;

	/** 構(gòu)造函數(shù) */
	AnimeCanvas() {
		//取得標(biāo)題圖像
		imgs = new Image[3];
		for(int i=0; i < imgs.length; i++) {
			try {
				imgs[i] = Image.createImage("/img" + String.valueOf(i) + ".png");
			}catch(java.io.IOException e) {}
		}

		//開(kāi)始描繪線(xiàn)程
		doStart();
	}

	/** 啟動(dòng)動(dòng)畫(huà)線(xiàn)程的方法 */
	private void doStart() {
		isStopped = false;
		Thread th = new Thread(this);
		th.start();
	}

	/** 停止動(dòng)畫(huà)線(xiàn)程的方法 */
	private void doStop() {
		isStopped = true;
	}

	/** 動(dòng)畫(huà)線(xiàn)程處理部分 */
	public void run() {
		imgInx = 0;
		while(! isStopped) {
			try {
				repaint();				//再描繪
				Thread.sleep(500);		//等待一定時(shí)間
				imgInx++;				//改變圖像的Index
				if(imgInx >= imgs.length) {
					imgInx = 0;
				}
			}catch(InterruptedException e){}
		}
	}

	/** 進(jìn)行描繪的方法 */
	protected void paint(Graphics g) {
		//將背景以白色清除
		g.setColor(0x00FFFFFF);
		g.fillRect(0, 0, getWidth(), getHeight());

		//描繪指定Index的圖像
		g.drawImage(imgs[imgInx], 0, 0, Graphics.TOP|Graphics.LEFT);
	}
}