键盘Actionlistener [英] Keyboard Actionlistener
本文介绍了键盘Actionlistener的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想让我的游戏中的太空船（PlayerShip.gif）在按下相应的键时向左，右，上，下移动。我知道我需要一个键盘监听器，但我有问题，弄清楚它在哪里，它实际上是什么。我的代码如下。
public class GamePanel extends JPanel implements KeyListener {
timer timer1;
定时器timer2;
ArrayList< Ships>船;
int x;
int y;
double speed;
int size;
int shipxCoord;
int shipyCoord;
int shipHeight;
int shipWidth;
int shipRise;
int shipRun;
boolean left = false;
boolean right = false;
boolean up = false;
boolean down = false;
图片enemyShip1;
Image enemyShip2;
图像播放器
ImageIcon ic = new ImageIcon（Ship.gif）;
ImageIcon ic2 = new ImageIcon（Ship2.gif）;
int width = ic.getIconWidth（）;
int height = ic.getIconHeight（）;
Image background = Toolkit.getDefaultToolkit（）。createImage（background.jpg）;
public GamePanel（int size，double speed）{
super（）;
x = 450;
y = 510;
ship = new ArrayList< Ships>（）;
//第一种敌人的召唤计时器，船之间的延迟时间为5秒
enemy1Timer（5）;
//第二种敌人的召唤计时器船之间的延迟3秒
enemy2Timer（3）;
this.size = size;
this.speed = speed;
enemyShip1 = new ImageIcon（ship.gif）。getImage（）？
enemyShip2 = new ImageIcon（ship2.gif）。getImage（）;
playerShip = new ImageIcon（playerShip.gif）。getImage（）;
// this.add（image）;
} // end constructor
public void paintComponent（Graphics g）{
super.paintComponent（g）;
g.drawImage（background，0，0，null）;
for（Ships s：ship）{
s.paintComponent（g）;
}
g.drawImage（playerShip，x，y，this）;
//g.drawImage(enemyShip2,x,y,this）;
} //结束方法paintComponent
public void move（）{
for（Ships s：ship）{
s.moveship（this）;
// s.detectCollision（ship）;
}
if（left）{
x - = speed;
}
if（right）{
x + = speed;
}
if（up）{
y - = speed;
}
if（down）{
y + = speed;
}
if（x> getWidth（） - size）{
x = getWidth（）
}
if（x <0）{
x = 0;
}
if（y> getHeight（） - size）{
y = getHeight（）
}
if（y <0）{
y = 0;
}
} //结束方法move
public void keyPressed（KeyEvent e）{
if（e.getKeyCode（）== e.VK_LEFT）{
left = true;
}
if（e.getKeyCode（）== e.VK_RIGHT）{
right = true;
}
if（e.getKeyCode（）== e.VK_UP）{
up = true;
}
if（e.getKeyCode（）== e.VK_DOWN）{
down = true;
}
} //结束方法keyPressed
public void keyReleased（KeyEvent e）{
if（e.getKeyCode（）== e。 VK_LEFT）{
left = false;
}
if（e.getKeyCode（）== e.VK_RIGHT）{
right = false;
}
if（e.getKeyCode（）== e.VK_UP）{
up = false;
}
if（e.getKeyCode（）== e.VK_DOWN）{
down = false;
}
}
public void enemy1Timer（int seconds）{
timer1 = new Timer（）;
timer1.schedule（new ShipSwarm1（），1000，seconds * 1000）;
} // end method enemy1Timer
类ShipSwarm1扩展TimerTask {
public void run（）{
for（int Wave = 1; Wave> ; 0; Wave--）{
Ship enemy = new Ships（ic，enemyShip1）;
ship.add（enemy）;
} // end for
} //结束方法运行
} //结束类Enemy1Swarm
public void enemy2Timer（int seconds）{
timer2 = new Timer（）;
timer2.schedule（new ShipSwarm2（），3000，seconds * 1000）;
} //结束方法enemy1Timer
类ShipSwarm2扩展TimerTask {
public void run（）{
for（int Wave = 1; Wave> ; 0; Wave--）{
发送敌人=新船（ic2，enemyShip2）;
ship.add（enemy）;
} // end for
} //结束方法运行
}
}
解决方案
查看此链接的游戏impelemented在Java中，它确实正是你要找的。
它是着名的 15场比赛
private void processKeys（）{
KeyboardFocusManager.getCurrentKeyboardFocusManager（）。addKeyEventDispatcher（
new KeyEventDispatcher（）{
public boolean dispatchKeyEvent（KeyEvent e）{
if（e.getID == KeyEvent.KEY_PRESSED）{
handleKeyPress（e.getKeyCode（））;
if（areThingsInPlace（）&&！dialogShown）{
dialogShown = true;
JOptionPane .showMessageDialog（null，祝贺你！你赢了！）;
System.exit（1）;
}
}
return false;
}
}）;
}
用于处理箭头键的handleKeyPress
$ b
private void handleKeyPress（int keyCode）{
int emptyIndex = findEmptyIndex（）;
int x = emptyIndex / SIZE;
int y = emptyIndex％SIZE;
switch（keyCode）{
case 37：// LEFT KEY
if（y == SIZE-1）return;
doSwap（x，y，x，y + 1）;
break;
case 38：// UP KEY
if（x == SIZE-1）return;
doSwap（x，y，x + 1，y）;
break;
case 39：//右键
if（y == 0）return;
doSwap（x，y，x，y-1）;
break;
case 40：// DOWN KEY
if（x == 0）return;
doSwap（x，y，x-1，y）;
break;
}
}
I am trying to make a space ship (PlayerShip.gif) in my game move left, right, up, and down when the coresponding keys are pressed. I know i need an keyboardListener but im having issues figuring out where it goes and how it is actually implimented. my code is as follows.
public class GamePanel extends JPanel implements KeyListener {
Timer timer1;
Timer timer2;
ArrayList<Ships> ship;
int x;
int y;
double speed;
int size;
int shipxCoord;
int shipyCoord;
int shipHeight;
int shipWidth;
int shipRise;
int shipRun;
boolean left = false;
boolean right = false;
boolean up = false;
boolean down = false;
Image enemyShip1;
Image enemyShip2;
Image playerShip;
ImageIcon ic = new ImageIcon("Ship.gif");
ImageIcon ic2 = new ImageIcon("Ship2.gif");
int width = ic.getIconWidth();
int height = ic.getIconHeight();
Image background = Toolkit.getDefaultToolkit().createImage("background.jpg");
public GamePanel(int size, double speed) {
super();
x = 450;
y = 510;
ship = new ArrayList<Ships>();
// call timer for 1st type of enemy Ship with a delay of 5 seconds between ships
enemy1Timer(5);
// call timer for 2nd type of enemy Ship with a delay of 3 seconds between ships
enemy2Timer(3);
this.size = size;
this.speed = speed;
enemyShip1 = new ImageIcon("ship.gif").getImage();
enemyShip2 = new ImageIcon("ship2.gif").getImage();
playerShip = new ImageIcon("playerShip.gif").getImage();
// this.add(image);
} // end constructor
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(background, 0, 0, null);
for (Ships s : ship) {
s.paintComponent(g);
}
g.drawImage(playerShip, x, y, this);
//g.drawImage(enemyShip2,x,y,this);
}// end method paintComponent
public void move() {
for (Ships s : ship) {
s.moveship(this);
// s.detectCollision(ship);
}
if (left) {
x -= speed;
}
if (right) {
x += speed;
}
if (up) {
y -= speed;
}
if (down) {
y += speed;
}
if (x > getWidth() - size) {
x = getWidth() - size;
}
if (x < 0) {
x = 0;
}
if (y > getHeight() - size) {
y = getHeight() - size;
}
if (y < 0) {
y = 0;
}
}// end method move
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == e.VK_LEFT) {
left = true;
}
if (e.getKeyCode() == e.VK_RIGHT) {
right = true;
}
if (e.getKeyCode() == e.VK_UP) {
up = true;
}
if (e.getKeyCode() == e.VK_DOWN) {
down = true;
}
} // end method keyPressed
public void keyReleased(KeyEvent e) {
if (e.getKeyCode() == e.VK_LEFT) {
left = false;
}
if (e.getKeyCode() == e.VK_RIGHT) {
right = false;
}
if (e.getKeyCode() == e.VK_UP) {
up = false;
}
if (e.getKeyCode() == e.VK_DOWN) {
down = false;
}
}
public void enemy1Timer(int seconds) {
timer1 = new Timer();
timer1.schedule(new ShipSwarm1(), 1000, seconds * 1000);
}// end method enemy1Timer
class ShipSwarm1 extends TimerTask {
public void run() {
for (int Wave = 1; Wave > 0; Wave--) {
Ships enemy = new Ships(ic, enemyShip1);
ship.add(enemy);
}// end for
}// end method run
}// end class Enemy1Swarm
public void enemy2Timer(int seconds) {
timer2 = new Timer();
timer2.schedule(new ShipSwarm2(), 3000, seconds * 1000);
}// end method enemy1Timer
class ShipSwarm2 extends TimerTask {
public void run() {
for (int Wave = 1; Wave > 0; Wave--) {
Ships enemy = new Ships(ic2, enemyShip2);
ship.add(enemy);
}// end for
}// end method run
}
}
解决方案
Take a look at this link for a game impelemented in Java and it does exactly what you are looking for. Key presses - up left right and down keys.
Its the famous 15-game
An excerpt from that,
private void processKeys(){
KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(
new KeyEventDispatcher() {
public boolean dispatchKeyEvent(KeyEvent e){
if(e.getID() == KeyEvent.KEY_PRESSED){
handleKeyPress(e.getKeyCode());
if(areThingsInPlace() && !dialogShown){
dialogShown = true;
JOptionPane.showMessageDialog(null,"Congratulations!!! YOU WIN!!");
System.exit(1);
}
}
return false;
}
});
}
The handleKeyPress() method for handling the arrow keys
private void handleKeyPress(int keyCode) {
int emptyIndex = findEmptyIndex();
int x = emptyIndex/SIZE;
int y = emptyIndex%SIZE;
switch (keyCode) {
case 37://LEFT KEY
if(y==SIZE-1) return;
doSwap(x,y,x,y+1);
break;
case 38://UP KEY
if(x==SIZE-1) return;
doSwap(x,y,x+1,y);
break;
case 39://RIGHT KEY
if(y==0) return;
doSwap(x,y,x,y-1);
break;
case 40://DOWN KEY
if(x==0) return;
doSwap(x,y,x-1,y);
break;
}
}
这篇关于键盘Actionlistener的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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