Java Game Development(26) - Intro to Keyboard Input

import java.awt.*;

import javax.swing.*;

public abstract class Core {

private static DisplayMode modes[] = {

new DisplayMode(800,600,32,0),

new DisplayMode(800,600,24,0),

new DisplayMode(800,600,16,0),

new DisplayMode(640,480,32,0),

new DisplayMode(640,480,24,0),

new DisplayMode(640,480,16,0),

};

private boolean running;

protected ScreenManager s;

//停止運行

public void stop(){

running = false;

}

//調用INIT和gameloop

public void run(){

try{

init();

gameloop();

}finally{

s.restoreScreen();

}

}

//設置全屏

public void init() {

s = new ScreenManager();

DisplayMode dm = s.findFirstCompatibleMode(modes);

s.setFullScreen(dm);

Window w = s.getFullScreenWindow();

w.setFont(new Font("Arial", Font.PLAIN, 20));

w.setBackground(Color.GREEN);

w.setForeground(Color.WHITE);

running = true;

}

//主遊戲循環

public void gameloop() {

long startTime = System.currentTimeMillis();

long cumTime = startTime;

while (running) {

long timePassed = System.currentTimeMillis() - cumTime;

cumTime += timePassed;

update(timePassed);

Graphics2D g = s.getGraphics();

draw(g);

g.dispose();

s.update();

try {

Thread.sleep(20);

} catch (Exception ex) {}

}

}

//更新動畫

public void update(long timePassed) {

}

//繪製到屏幕上

public abstract void draw(Graphics2D g);

}

創建新class(KeyTest.java)

import java.awt.*;

import java.awt.event.*;

public class KeyTest extends Core implements KeyListener { → 是從鍵盤的監聽器

public static void main(String[] args) {

new KeyTest().run();

}

private String mess = "";

//init also call init from super class

public void init() {

super.init(); → 調用init()(core java)

Window w = s.getFullScreenWindow();

w.setFocusTraversalKeysEnabled(false); → 鍵盤設置普通按鈕

w.addKeyListener(this); → 等待鍵盤輸入

mess = "Press escape to exit";

}

}