import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Zhang extends JFrame implements Runnable, KeyListener
{
Container con = getContentPane();
Thread t = new Thread(this);
int Hogwartsx = 10, Hogwartsy= 10, Snitchx = 200, Snitchy = 200, Loopx = 50, Loopy = 300, Loop2x = 120, Loop2y = 10,
Loopx2 = 190, Loopy2 = 300, Loop2x2 = 260, Loop2y2 = 10,Loopx3 = 320,
Loopy3 = 300, Loop2x3 = 380, Loop2y3 = 10,
SnitchxVel = 10, SnitchyVel = 10;
Image Loop;
Image Loop2;
Image Snitch;
Image Hogwarts;
public Zhang()
{
addKeyListener(this);
Hogwarts = Toolkit.getDefaultToolkit().getImage(getClass().getResource("Hogwarts.gif"));
Hogwarts = Hogwarts.getScaledInstance(500, 500, 1);
Loop2 = Toolkit.getDefaultToolkit().getImage(getClass().getResource("Loop2.gif"));
Loop2 = Loop2.getScaledInstance(200, 200, 1);
Loop = Toolkit.getDefaultToolkit().getImage(getClass().getResource("Loop.gif"));
Loop = Loop.getScaledInstance(200, 200, 1);
Snitch = Toolkit.getDefaultToolkit().getImage(getClass().getResource("Snitch.gif"));
Snitch = Snitch.getScaledInstance(150, 150, 1);
con.setLayout(new FlowLayout());
t.start();
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public void run()
{
try{
while(true)
{
t.sleep(100);
repaint();
Snitchy += SnitchyVel;
if (Snitchy > 500)
{
System.exit(0);
}
}
}
catch(Exception e){}
}
public void update(Graphics g)
{
paint(g);
}
public void paint(Graphics gr)
{
Image i=createImage(getSize().width, getSize().height);
Graphics2D g2 = (Graphics2D)i.getGraphics();
g2.drawImage(Hogwarts, Hogwartsx, Hogwartsy, this);
g2.drawImage(Loop2, Loop2x, Loop2y, this);
g2.drawImage(Loop,Loopx, Loopy, this);
g2.drawImage(Loop2, Loop2x2, Loop2y2, this);
g2.drawImage(Loop,Loopx2, Loopy2, this);
g2.drawImage(Loop2, Loop2x3, Loop2y3, this);
g2.drawImage(Loop,Loopx3, Loopy3, this);
g2.drawImage(Snitch,Snitchx,Snitchy, this);
g2.dispose();
gr.drawImage(i, 0, 0, this);
}
public static void main(String[] args)
{
Zhang frame = new Zhang();
frame.setSize(500, 500);
frame.setVisible(true);
}
public void keyReleased (KeyEvent k)
{
}
public void keyPressed (KeyEvent k)
{
if( k.getKeyCode() == 38)
{
for (SnitchyVel = 10; SnitchyVel>= 10; SnitchyVel++)
{
Snitchy-=SnitchyVel;
for (SnitchyVel = 0; SnitchyVel<=10; SnitchyVel--)
{
Snitchy+=SnitchyVel;
}
}
}
}
public void keyTyped (KeyEvent k)
{}
}
所以在我的Programming类中，我们正在尝试编写Flappy Bird或它的一个版本。就我而言，我正在以哈利波特为主题。当我按下键盘上的向上箭头直到速度达到0时，我的飞贼假设减速，这将导致它停止移动。一旦速度达到0，就会假设飞贼在下降时加速，直到它达到预先声明的10速度。有人可以向我解释如何加速和减速？
答案 0 :(得分：0)
我不知道这个游戏，只听说过它。
您的代码存在一些问题。经典：
update或paint方法具体的：
int值中。对于简单的2D游戏，Point2D可能是一个不错的选择。 一种非常非常简单的方法：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Point2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class CrappyBird
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
createAndShowGUI();
}
});
}
private static void createAndShowGUI()
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().setLayout(new BorderLayout());
CrappyBirdGame crappyBirdGame = new CrappyBirdGame();
CrappyBirdPanel crappyBirdPanel = new CrappyBirdPanel(crappyBirdGame);
crappyBirdGame.setComponent(crappyBirdPanel);
f.getContentPane().add(crappyBirdPanel, BorderLayout.CENTER);
crappyBirdGame.start();
f.setSize(800, 800);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
class CrappyBirdGame
{
private Point2D position = new Point2D.Double(0, 500);
private Point2D velocity = new Point2D.Double(20, 0);
private Point2D acceleration = new Point2D.Double(0, -9.81);
private JComponent component;
void setComponent(JComponent component)
{
this.component = component;
}
void start()
{
Thread thread = new Thread(new Runnable()
{
@Override
public void run()
{
long oldNS = System.nanoTime();
while (true)
{
long newNS = System.nanoTime();
performAnimation(newNS - oldNS);
oldNS = newNS;
component.repaint();
try
{
Thread.sleep(20);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}
}
});
thread.setDaemon(true);
thread.start();
}
private void performAnimation(long ns)
{
double delta = (ns / 1e9) * 15;
double newVx = velocity.getX() + delta * acceleration.getX();
double newVy = velocity.getY() + delta * acceleration.getY();
velocity.setLocation(newVx, newVy);
double newPx = position.getX() + delta * velocity.getX();
double newPy = position.getY() + delta * velocity.getY();
if (newPy < 0)
{
newPy = 0;
velocity.setLocation(velocity.getX(), 0);
}
position.setLocation(newPx, newPy);
}
public Point2D getPosition()
{
return new Point2D.Double(position.getX(), position.getY());
}
public void flap()
{
double newVx = velocity.getX();
double newVy = velocity.getY() + 50;
newVy = Math.min(30, newVy);
velocity.setLocation(newVx, newVy);
}
}
class CrappyBirdPanel extends JPanel
{
private final CrappyBirdGame crappyBirdGame;
CrappyBirdPanel(final CrappyBirdGame crappyBirdGame)
{
this.crappyBirdGame = crappyBirdGame;
setFocusable(true);
requestFocusInWindow();
KeyListener keyListener = new KeyAdapter()
{
@Override
public void keyPressed(KeyEvent e)
{
if( e.getKeyCode() == KeyEvent.VK_UP)
{
crappyBirdGame.flap();
}
}
};
addKeyListener(keyListener);
}
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
Point2D p = crappyBirdGame.getPosition();
int x = (int)p.getX() % getWidth();
int y = getHeight() - (int)p.getY();
g.setColor(Color.BLUE);
g.fillOval(x-15, y-15, 30, 30);
}
}