keyeventcanvas.java

一款飞行中打星星的游戏

/*
 * 创建日期 2005-11-10
 *
 * TODO 要更改此生成的文件的模板，请转至
 * 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */
package demo;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;

/**
 * @author Administrator
 *
 * TODO 要更改此生成的类型注释的模板，请转至
 * 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */
final class KeyEventCanvas extends Canvas
implements CommandListener {
private String[] output;//弌椡僨乕僞

//僐儞僗僩儔僋僞
KeyEventCanvas() {
    //弌椡僨乕僞
    output=new String[6];
    for (int i=0;i<6;i++) {
        output[i]="";
    }

    //僐儅儞僪
    addCommand(new Command("CMD0",Command.SCREEN,0));
    addCommand(new Command("CMD1",Command.SCREEN,1));
    setCommandListener(this);
}

//弌椡僨乕僞偺昞帵
public void paint(Graphics g) {
    g.setColor((255<<16)+(255<<8)+255);
    g.fillRect(0,0,getWidth(),getHeight());
    g.setColor(255<<16);
    for (int i=0;i<6;i++) {
        g.drawString(output[i],0,18*(i+1),Graphics.LEFT|Graphics.BOTTOM);
    }
}

//僉乕僾儗僗僀儀儞僩
protected synchronized void keyPressed(int keyCode) {
    addOutput("PRESSED ",keyCode);
}

//僉乕儕儕乕僗
protected synchronized void keyReleased(int keyCode) {
    addOutput("RELEASED ",keyCode);
}

//弌椡僨乕僞傪捛壛
private void addOutput(String data,int keyCode) {
    //弌椡僨乕僞傪惗惉
    int action=getGameAction(keyCode);
    if (action==UP) {
        data+="UP";
    } else if (action==DOWN) {
        data+="DOWN";
    }
    if (keyCode==KEY_NUM0) {
        data+="NUM0";
    } else if (keyCode==KEY_NUM1) {
        data+="NUM1";
    }

    //弌椡僨乕僞傪捛壛
    System.arraycopy(output,0,output,1,5);
    output[0]=data;
    repaint();
}

//僐儅儞僪傾僋僔儑儞僀儀儞僩
public void commandAction(Command c,Displayable s) {
    System.arraycopy(output,0,output,1,5);
    output[0]="PRESSED "+c.getLabel();
    repaint();
}
}