Java 使用箭头键移动矩形
我正在开发一个简单的游戏,你可以用左右箭头键移动一个矩形,用空格键射击 我添加了一个Java 使用箭头键移动矩形,java,keylistener,keyevent,Java,Keylistener,Keyevent,我正在开发一个简单的游戏,你可以用左右箭头键移动一个矩形,用空格键射击 我添加了一个keylister和其他功能,但是当我运行它时,我没有任何功能作为按键或其他功能的输出 我有两门课: PaintDemo类: package game; import java.awt.BorderLayout; import java.awt.Color; import javax.swing.JFrame; import javax.swing.JPanel; public class PaintDemo
keylister
和其他功能,但是当我运行它时,我没有任何功能作为按键或其他功能的输出
我有两门课:
PaintDemo类:
package game;
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class PaintDemo {
public static void main(String[] args) {
JFrame mainFrame = new JFrame("Game 1.1");
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setBounds(10, 10, 400, 400);
mainFrame.setLayout(new BorderLayout());
JPanel mainPanel = new JPanel();
mainPanel.setBackground(Color.WHITE);
PaintComponent paintPanel = new PaintComponent();
mainFrame.add(mainPanel, BorderLayout.PAGE_START);
mainFrame.add(paintPanel, BorderLayout.CENTER);
mainFrame.setVisible(true);
}
}
package game;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Rectangle2D;
import javax.swing.JPanel;
public class PaintComponent extends JPanel implements KeyListener {
int dx = 200;
int dy = 300;
int my = 300;
public Rectangle2D rec = new Rectangle2D.Double(dx , dy, 30, 10);
public PaintComponent() {
this.addKeyListener(this);
this.setBackground(Color.white);
}
public void shoot(KeyEvent evt){
if (evt.getKeyCode() == KeyEvent.VK_SPACE){
my -= 7;
repaint();
}
}
public void moveRec(KeyEvent evt){
switch(evt.getKeyCode()){
case KeyEvent.VK_LEFT:
System.out.println("test");
dx -= 2;
rec.setRect(dx, dy, 30, 10);
repaint();
case KeyEvent.VK_RIGHT:
dx += 2;
rec.setRect(dx, dy, 30, 10);
repaint();
}
}
@Override
protected void paintComponent(Graphics grphcs){
super.paintComponent(grphcs);
Graphics2D gr = (Graphics2D) grphcs;
gr.draw(rec);
}
@Override
public void keyTyped(KeyEvent e) {
System.out.println("2");
shoot(e);
}
@Override
public void keyPressed(KeyEvent e) {
moveRec(e);
}
@Override
public void keyReleased(KeyEvent e) {
}
}
PaintComponent类:
package game;
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class PaintDemo {
public static void main(String[] args) {
JFrame mainFrame = new JFrame("Game 1.1");
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setBounds(10, 10, 400, 400);
mainFrame.setLayout(new BorderLayout());
JPanel mainPanel = new JPanel();
mainPanel.setBackground(Color.WHITE);
PaintComponent paintPanel = new PaintComponent();
mainFrame.add(mainPanel, BorderLayout.PAGE_START);
mainFrame.add(paintPanel, BorderLayout.CENTER);
mainFrame.setVisible(true);
}
}
package game;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Rectangle2D;
import javax.swing.JPanel;
public class PaintComponent extends JPanel implements KeyListener {
int dx = 200;
int dy = 300;
int my = 300;
public Rectangle2D rec = new Rectangle2D.Double(dx , dy, 30, 10);
public PaintComponent() {
this.addKeyListener(this);
this.setBackground(Color.white);
}
public void shoot(KeyEvent evt){
if (evt.getKeyCode() == KeyEvent.VK_SPACE){
my -= 7;
repaint();
}
}
public void moveRec(KeyEvent evt){
switch(evt.getKeyCode()){
case KeyEvent.VK_LEFT:
System.out.println("test");
dx -= 2;
rec.setRect(dx, dy, 30, 10);
repaint();
case KeyEvent.VK_RIGHT:
dx += 2;
rec.setRect(dx, dy, 30, 10);
repaint();
}
}
@Override
protected void paintComponent(Graphics grphcs){
super.paintComponent(grphcs);
Graphics2D gr = (Graphics2D) grphcs;
gr.draw(rec);
}
@Override
public void keyTyped(KeyEvent e) {
System.out.println("2");
shoot(e);
}
@Override
public void keyPressed(KeyEvent e) {
moveRec(e);
}
@Override
public void keyReleased(KeyEvent e) {
}
}
拍摄方法未完成。将repaint()更改为此处的paintComponent,并添加图形g=getGraphics()
让我知道这是否有效:)
编辑:
添加这一行
this.setFocusable(true);
对于PaintComponent构造函数,它将使按键通过。您忘记做两件事,第一件是您的面板应该是可聚焦的,将此添加到您的
PaintComponent
构造函数this.setFocusable(true)
中,第二件是您没有断开开关盒,因此,为每种情况添加break
语句,那么它应该可以工作
switch (evt.getKeyCode()) {
case KeyEvent.VK_LEFT:
System.out.println("test");
dx -= 2;
rec.setRect(dx, dy, 30, 10);
repaint();
break;
case KeyEvent.VK_RIGHT:
dx += 2;
rec.setRect(dx, dy, 30, 10);
repaint();
break;
}
当你按左键或右键时会发生什么?矩形移动了吗?没有任何事情发生!是否显示矩形?是,矩形可见!我不知道如何应用此更改!什么都没发生(我写了system.out.println(“test”)来测试我的keylistener是否工作!它不是!我的意思是它没有写“test”!我应用了更改,它不工作!case KeyEvent.VK_左:system.out.println(“test”);dx-=2;rec.setRect(dx,dy,30,10);Graphics g=getGraphics();paintComponent(g);break;case KeyEvent.VK_RIGHT:dx+=2;rec.setRect(dx,dy,30,10);Graphics g2=getGraphics();paintComponent(g2);break;我不得不将案例2中的第二个图形重命名为g2!可以吗?!是的。您添加了“this.setFocusable(true);”到PaintComponent构造函数?你添加了setFocusable(true)了吗?你在PaintComponent
构造函数中添加了它了吗?它成功了!!!!:D我犯了一个错误,以前在我的paintdemo类中添加了setFocusable()!非常感谢!