imagescrolltest.java~1~

来自「java手机程序开发随书光盘源代码」· JAVA~1~ 代码 · 共 80 行

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

public class ImageScrollTest extends MIDlet{

	Display display;
	MyCanvas myCanvas;
	
	public ImageScrollTest(){
		display = Display.getDisplay(this);
		myCanvas = new MyCanvas();
	}

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

	public void pauseApp(){
	}

	public void destroyApp(boolean unconditional){
	}
	
	class MyCanvas extends Canvas implements CommandListener{
	
		Command exitCmd;
		Image offScreen;
		Image spriteImage;
		Image background;
		int x, y;
		int imageX, imageY;
		int imageWidth, imageHeight;
	
		public MyCanvas(){
			
			if(!isDoubleBuffered()){
				offScreen = Image.createImage(getWidth(), getHeight());
			}
			
			try{
				spriteImage = Image.createImage("/sprite.png");
				background = Image.createImage("/background.png");
			}
			catch(Exception ex){}
			
			imageWidth = background.getWidth();
			imageHeight = background.getHeight();
			
			exitCmd = new Command("瞒秨", Command.EXIT, 1);
			addCommand(exitCmd);
			setCommandListener(this);
		}

		public void paint(Graphics g){
			
			Graphics old = g;

			if(offScreen != null){
				g = offScreen.getGraphics();	
			}
			
			g.setColor(0xFFFFFF);
			g.fillRect(0, 0, getWidth(), getHeight());
			
			
			g.drawImage(background, imageX, imageY, Graphics.LEFT|Graphics.TOP);
			g.drawImage(background, imageX, imageY-imageHeight, Graphics.LEFT|Graphics.TOP);
		
			g.drawImage(background, imageX-imageWidth, imageY, Graphics.LEFT|Graphics.TOP);
			g.drawImage(background, imageX-imageWidth, imageY-imageHeight, Graphics.LEFT|Graphics.TOP);
			
			
			g.drawImage(spriteImage, 
						(getWidth()-spriteImage.getWidth())/2,
						(getHeight()-spriteImage.getHeight())/2,
						Graphics.LEFT|Graphics.TOP);
			
			g.setColor(0);
			g.drawString("ヘ玡