translateorigin.java

《精通JAVA手机游戏与应用程序设计》随书光盘

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class translateOrigin extends MIDlet implements CommandListener {

	private Command exitCommand;
	private translateOriginCanvas sg;

	public translateOrigin() {
		exitCommand = new Command("Exit", Command.EXIT, 1);
		sg = new translateOriginCanvas();
		sg.addCommand(exitCommand);
		sg.setCommandListener(this);
		Display.getDisplay(this).setCurrent(sg);
	}
	protected void startApp() {
	}

	protected void pauseApp() {
	}

	protected void destroyApp(boolean arg0) {
	}

	public void commandAction(Command c, Displayable d) {
		if (c == exitCommand) {
			destroyApp(false);
			notifyDestroyed();
		}
	}
}

class translateOriginCanvas extends Canvas {

	protected void paint(Graphics g) {

		for (int i = 1; i <= 5; i++) {
			g.drawString("String--"+ String.valueOf(i), 0, 0, Graphics.TOP | Graphics.LEFT);
			//转移原点
			g.translate(20,20);
		}
		String s = String.valueOf(g.getTranslateX());
		g.translate(-100,-100);
		g.drawString(s,0,0,Graphics.TOP | Graphics.LEFT);
	}

}