java - 如何在 Java 中为滚动游戏制作简单的跳跃动画？
问题描述
我对 Java 很陌生，但我一直在研究滚动背景游戏，比如 Geometry Dash。这是非常简单的骨架，只有一些云表示背景正在移动，但我现在面临的问题是如何制作它，以便我的玩家可以通过按向上箭头键跳起来然后回落，就像跳跃动作一样。我希望有一个简单的解决方案来解决我的问题，以便有人可以帮助我并且我理解它。我已经做到了，所以玩家可以跳起来，但我无法让它在它跳下来后返回。任何帮助将不胜感激。谢谢！
这是代码：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.Rectangle2D;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
/**
*
* @author kids
*/
public class game extends javax.swing.JFrame {
private PaintSurface canvas;
int x_position = 0;
int y_position = 580;
int x_speed = 7;
int enemy_posX = 0;
int enemy_posY = 560;
int x_pos = 0;
int y_pos = 0;
int x_pos2 = -1200;
int x_position2 = -1200;
int enemy_posX2 = -1150;
int enemy_posY2 = 560;
int cloudOnex = 30;
int cloudOney = 70;
int cloud2x = -1150;
int cloud2y = 70;
int cloud3x = 700;
int cloud3y = 70;
int cloud4x = -600;
int cloud4y = 70;
int playerx =400;
int playery = 540;
/**
* Creates new form game
*/
public game() {
JPanel btnPanel = new JPanel(new FlowLayout());
JButton btnUp = new JButton("Move Up ");
btnPanel.add(btnUp);
btnUp.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
playery += 10;
canvas.repaint();
requestFocus(); // change the focus to JFrame to receive KeyEvent
}
});
Container cp = getContentPane();
cp.setLayout(new BorderLayout());
// "super" JFrame fires KeyEvent
addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent evt) {
switch (evt.getKeyCode()) {
case KeyEvent.VK_UP:
playery -= 22;
repaint();
break;
}
}
});
this.setTitle("Scrolling Game");
this.setSize(1200, 650);
// super.setBackground(Color.YELLOW);
this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
this.add(new PaintSurface(), BorderLayout.CENTER);
this.setVisible(true);
canvas = new PaintSurface();
this.add(canvas, BorderLayout.CENTER);
//settings for the form, handling things such as exiting and size
Timer timer = new Timer(10, e -> {
canvas.movement();
canvas.check();
canvas.repaint();
});
timer.start();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
class PaintSurface extends JComponent {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
Rectangle2D background = new Rectangle2D.Float(x_pos, y_pos, 1200, 650);
g2.setColor(Color.CYAN);
g2.fill(background);
Rectangle2D ground = new Rectangle2D.Float(x_position, y_position, 1200, 30);
g2.setColor(Color.GREEN);
g2.fill(ground);
Rectangle2D cloudOne = new Rectangle2D.Float(cloudOnex, cloudOney, 70, 70);
g2.setColor(Color.WHITE);
g2.fill(cloudOne);
Rectangle2D cloudThree = new Rectangle2D.Float(cloud3x, cloud3y, 70, 70);
g2.setColor(Color.WHITE);
g2.fill(cloudThree);
Rectangle2D background2 = new Rectangle2D.Float(x_pos2, y_pos, 1200, 650);
g2.setColor(Color.CYAN);
g2.fill(background2);
Rectangle2D ground2 = new Rectangle2D.Float(x_position2, y_position, 1200, 30);
g2.setColor(Color.GREEN);
g2.fill(ground2);
Rectangle2D cloudTwo = new Rectangle2D.Float(cloud2x, cloud2y, 70, 70);
g2.setColor(Color.WHITE);
g2.fill(cloudTwo);
Rectangle2D cloudFour = new Rectangle2D.Float(cloud4x, cloud4y, 70, 70);
g2.setColor(Color.WHITE);
g2.fill(cloudFour);
Rectangle2D player = new Rectangle2D.Float(playerx, playery,40,40);
g2.setColor(Color.red);
g2.fill(player);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
/**
* @param args the command line arguments
*/
}
public void movement(){
cloudOnex += 10;
cloud2x += 10;
cloud3x += 10;
cloud4x += 10;
x_position += 10;
x_pos += 10;
x_position2 += 10;
x_pos2 += 10;
enemy_posX += 10;
enemy_posX2 += 10;
try { Thread.sleep(20); } /* this will pause for 50 milliseconds */
catch (InterruptedException e) { System.err.println("sleep exception"); }
}
public void check(){
if (x_pos == 1200 ) {
x_pos = -1200;
//x_position = -1200;
repaint();
}
if (x_pos2 == 1200) {
x_pos2 = -1200;
// x_position2 = -1200;
repaint();
}
if (x_position == 1200) {
x_position = -1200;
repaint();
}
if (x_position2 == 1200) {
x_position2 = -1200;
repaint();
}
if (cloudOnex == 1200) {
cloudOnex = -1150;
repaint();
}
if (cloud2x == 1200){
cloud2x = -1150;
repaint();
}
// if (x_position2 > 1300) {
// x_position2 = -600;
// repaint();
// }
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(game.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(game.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(game.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(game.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new game().setVisible(true);
}
});
}
// Variables declaration - do not modify
// End of variables declaration
}
解决方案
最简单的方法是让角色上升，然后在一定时间后下降。为此，请将函数中的 addKeyListener 代码替换为以下内容：
addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent evt) {
switch (evt.getKeyCode()) {
case KeyEvent.VK_UP:
playery -= 22;
repaint();
new java.util.Timer().schedule(
new java.util.TimerTask() {
@Override
public void run() {
playery += 22;
}
},
100
);
break;
}
}
});
这使用了 java.util.TimerTask，它允许你延迟一个动作。
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