rectangletest.java

java手机程序开发随书光盘源代码

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

public class RectangleTest extends MIDlet implements ItemStateListener{


	Display display;
	MyCanvas myCanvas;
	ChoiceGroup setFilled, setRound;
	Form form;

	public RectangleTest(){
		display = Display.getDisplay(this);
		myCanvas = new MyCanvas();
		form = new Form("选择矩形类型");
		setFilled = new ChoiceGroup("Filled", List.EXCLUSIVE);
		setRound = new ChoiceGroup("Round", List.EXCLUSIVE);
		setFilled.append("FALSE", null);
		setFilled.append("TRUE", null);
		setRound.append("FALSE", null);
		setRound.append("TRUE", null);
		form.append(setFilled);
		form.append(setRound);
		form.setItemStateListener(this);

	}


	public void startApp(){
		display.setCurrent(myCanvas);

	}

	public void pauseApp(){

	}


	public void destroyApp(boolean unconditional){

	}

	public void itemStateChanged(Item item){

		if(item == setFilled){
			int index = setFilled.getSelectedIndex();
			myCanvas.isFilled = (index == 0? false: true);
		}
		else if(item == setRound){
			int index = setRound.getSelectedIndex();
			myCanvas.isRound = (index == 0? false: true);
		}
		myCanvas.repaint();
		display.setCurrent(myCanvas);
	}


	class MyCanvas extends Canvas implements CommandListener{

		int width;
		int height;
		int arcWidth;
		int arcHeight;
		int x, y;
		int mode;
		boolean isFilled;
		boolean isRound;
		Command exitCmd;
		Command changeCmd;

		public MyCanvas(){
			this.height = height;
			this.width = width;
			x = getWidth()/4;
			y = getHeight()/4;
			width = getWidth()/2;
			height = getHeight()/2;
			isFilled = false;
			isRound = false;
			arcWidth = 10;
			arcHeight = 10;
			exitCmd = new Command("退出", Command.EXIT, 1);
			changeCmd = new Command("改变", Command.SCREEN, 1);
			addCommand(exitCmd);
			addCommand(changeCmd);
			setCommandListener(this);
		}


		public void paint(Graphics g){

			g.setColor(0xFFFFFF);
			g.fillRect(0, 0, getWidth(), getHeight());
			g.setColor(0);
			if(isFilled){
				if(isRound){
					g.fillRoundRect(x, y, width, height, arcWidth, arcHeight);
				}
				else{
					g.fillRect(x, y, width, height);
				}
			}
			else{
				if(isRound){
					g.drawRoundRect(x, y, width, height, arcWidth, arcHeight);
				}
				else{
					g.drawRect(x, y, width, height);
				}
			}
		}

		public void commandAction(Command c, Displayable d){

			if(c == exitCmd){
				destroyApp(true);
				notifyDestroyed();
			}
			else if(c == changeCmd){
				display.setCurrent(form);
			}

		}
	}

}