我想写一个小游戏,我可以使用 W , A , S ,在JavaFX Panel上移动球。 kbd> D 键。
我有getPosX()
和setPosX()
,但我不知道如何撰写KeyListener
,例如如果按 D ,则计算setPosX(getPosX()+1)
。
我该怎么做?
答案 0 :(得分:17)
在场景中添加按键和释放处理程序,并更新应用程序中记录的移动状态变量。动画计时器挂钩到JavaFX脉冲机制(默认情况下将被限制为每秒发射60次事件) - 这是一种游戏“循环”。在计时器中,检查运动状态变量并将其delta动作应用于角色位置 - 这实际上会使角色围绕屏幕移动以响应按键。
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.*;
import javafx.scene.image.*;
import javafx.scene.input.KeyEvent;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
/**
* Hold down an arrow key to have your hero move around the screen.
* Hold down the shift key to have the hero run.
*/
public class Runner extends Application {
private static final double W = 600, H = 400;
private static final String HERO_IMAGE_LOC =
"http://icons.iconarchive.com/icons/raindropmemory/legendora/64/Hero-icon.png";
private Image heroImage;
private Node hero;
boolean running, goNorth, goSouth, goEast, goWest;
@Override
public void start(Stage stage) throws Exception {
heroImage = new Image(HERO_IMAGE_LOC);
hero = new ImageView(heroImage);
Group dungeon = new Group(hero);
moveHeroTo(W / 2, H / 2);
Scene scene = new Scene(dungeon, W, H, Color.FORESTGREEN);
scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent event) {
switch (event.getCode()) {
case UP: goNorth = true; break;
case DOWN: goSouth = true; break;
case LEFT: goWest = true; break;
case RIGHT: goEast = true; break;
case SHIFT: running = true; break;
}
}
});
scene.setOnKeyReleased(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent event) {
switch (event.getCode()) {
case UP: goNorth = false; break;
case DOWN: goSouth = false; break;
case LEFT: goWest = false; break;
case RIGHT: goEast = false; break;
case SHIFT: running = false; break;
}
}
});
stage.setScene(scene);
stage.show();
AnimationTimer timer = new AnimationTimer() {
@Override
public void handle(long now) {
int dx = 0, dy = 0;
if (goNorth) dy -= 1;
if (goSouth) dy += 1;
if (goEast) dx += 1;
if (goWest) dx -= 1;
if (running) { dx *= 3; dy *= 3; }
moveHeroBy(dx, dy);
}
};
timer.start();
}
private void moveHeroBy(int dx, int dy) {
if (dx == 0 && dy == 0) return;
final double cx = hero.getBoundsInLocal().getWidth() / 2;
final double cy = hero.getBoundsInLocal().getHeight() / 2;
double x = cx + hero.getLayoutX() + dx;
double y = cy + hero.getLayoutY() + dy;
moveHeroTo(x, y);
}
private void moveHeroTo(double x, double y) {
final double cx = hero.getBoundsInLocal().getWidth() / 2;
final double cy = hero.getBoundsInLocal().getHeight() / 2;
if (x - cx >= 0 &&
x + cx <= W &&
y - cy >= 0 &&
y + cy <= H) {
hero.relocate(x - cx, y - cy);
}
}
public static void main(String[] args) { launch(args); }
}
答案 1 :(得分:2)
Scene myScene = new Scene();
KeyCombination cntrlZ = new KeyCodeCombination(KeyCode.Z, KeyCodeCombination.CONTROL_DOWN);
myScene.setOnKeyPressed(new EventHandler<KeyEvent>(){
@Override
public void handle(KeyEvent event) {
if(contrlZ.match(event)){
//Do something
}
}
});
答案 2 :(得分:0)
使用 JNativeHook: https://github.com/kwhat/jnativehook
<!-- https://mvnrepository.com/artifact/com.1stleg/jnativehook -->
<dependency>
<groupId>com.1stleg</groupId>
<artifactId>jnativehook</artifactId>
<version>2.1.0</version>
</dependency>
private void initKeyListener(Stage primaryStage){
/* Note: JNativeHook does *NOT* operate on the event dispatching thread.
* Because Swing components must be accessed on the event dispatching
* thread, you *MUST* wrap access to Swing components using the
* SwingUtilities.invokeLater() or EventQueue.invokeLater() methods.
*/
try {
GlobalScreen.registerNativeHook();
} catch (NativeHookException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
GlobalScreen.addNativeKeyListener(new NativeKeyListener() {
public void nativeKeyPressed(NativeKeyEvent e) {
if ( (e.getModifiers() & NativeKeyEvent.CTRL_MASK) != 0
&& (e.getModifiers() & NativeKeyEvent.ALT_MASK) != 0
&& (e.getKeyCode() == NativeKeyEvent.VC_B)){
logger.debug("key :Hide");
primaryStage.hide();
}
if ( (e.getModifiers() & NativeKeyEvent.CTRL_MASK) != 0
&& (e.getModifiers() & NativeKeyEvent.SHIFT_MASK) != 0
&& (e.getModifiers() & NativeKeyEvent.ALT_MASK) != 0
&& (e.getKeyCode() == NativeKeyEvent.VC_B)){
logger.debug("key :Show");
primaryStage.show();
}
//System.out.println("Key Pressed: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
}
public void nativeKeyReleased(NativeKeyEvent e) {
//System.out.println("Key Released: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
}
public void nativeKeyTyped(NativeKeyEvent e) {
//System.out.println("Key Typed: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
}
});
/*
GlobalScreen.addNativeMouseListener(new NativeMouseListener() {
@Override
public void nativeMouseReleased(NativeMouseEvent arg0) {
// TODO Auto-generated method stub
System.out.println("MouseReleased()");
}
@Override
public void nativeMousePressed(NativeMouseEvent arg0) {
// TODO Auto-generated method stub
System.out.println("MousePressed()");
}
@Override
public void nativeMouseClicked(NativeMouseEvent arg0) {
// TODO Auto-generated method stub
System.out.println("MouseClicked()");
}
});
*/
}