我的问题在于，我不知道如何管理硬币掉落的速度和掉落的频率
为了完成我的项目，我需要让硬币以正常速度下降（此时它们太快）并且随着时间的推移放下更多的硬币（例如：在开始时它像每1.5秒一次，在15秒每1秒钟下降1次，每0.5秒（...）30秒1次，最后5秒钟就是很多。
package Game;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
class MenuPanel extends JPanel{
JButton play = new JButton("");
JButton help = new JButton("");
JButton exit = new JButton("");
Image menubkg = new ImageIcon("images\\menubkg.png").getImage(); //menu background
/* Setting icons on buttons */
ImageIcon playbtn = new ImageIcon("buttons\\play.png");
ImageIcon helpbtn = new ImageIcon("buttons\\help.png");
ImageIcon exitbtn = new ImageIcon("buttons\\exit.png");
JPanel center = new JPanel(); //adding another jpanel in a panel for boxLayout
MenuPanel(){
center.setLayout(new BoxLayout(center,BoxLayout.Y_AXIS)); //setting box layout
add(center); //adding the panel to anothe JPanel
/* setting icons on buttons */
play.setIcon(playbtn);
help.setIcon(helpbtn);
exit.setIcon(exitbtn);
/* adding the buttons in the panel */
center.add(play);
center.add(help);
center.add(exit);
/* adding mouseListeners on buttons */
play.addMouseListener(new Click());
help.addMouseListener(new Click());
exit.addMouseListener(new Click());
}//end constructor
class Click extends MouseAdapter{ //internal friendly class
public void mouseClicked(MouseEvent me){
if(me.getSource()== play){
Game.cl.show(Game.cards, "GamePanel"); //show gamePanel when play is clicked
}
if(me.getSource()== help){
Game.cl.show(Game.cards, "HelpPanel"); //show helpPanel when help is clicked
}
if(me.getSource()== exit){
System.exit(0); //exit application when exit is clicked
}
}//end mouseClick
}//end mouseAdapter
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
setFocusable(true);
g2d.drawImage(menubkg, 0,0, null);
repaint();
}
}
///////////////////////////////// Help Panel \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
class HelpPanel extends JPanel{
Image helpbkg = new ImageIcon("images\\helpbkg.png").getImage(); //help image background
JButton back = new JButton("Back"); //back button
HelpPanel(){
setFocusable(true);
add(back);
back.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent me){
Game.cl.show(Game.cards, "MenuPanel");
}
});
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.drawImage(helpbkg, 0,0, null);
repaint();
}
}
/////////////////////////////////// GAME PANEL \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
class GamePanel extends JPanel{
Image gamebkg = new ImageIcon("images\\gamebkg.png").getImage();
Image basket = new ImageIcon("images\\basket.png").getImage();
Image coin = new ImageIcon("images\\coin.png").getImage();
Image gameOverbkg= new ImageIcon("images\\gameOverbkg.png").getImage();
Image tempbkg; //temporary background
int x_basket,y_basket; //basket x and y coordinates
int x_coin,y_coin; // x and y coord of coin
Random rand = new Random(); // for randomizing xcoord of coin
JLabel time;
JLabel points;
int pointsCount = 0;
int timeleft = 59;
int counter = 0;
boolean gameOver = false;
GamePanel(){
setLayout(null);
setFocusable(true);
tempbkg = gamebkg;
x_basket = 450; y_basket = 600;
x_coin = (int)rand.nextInt(1000);
y_coin = 0;
time = new JLabel("Time: 59");
time.setBounds(20, 10, 50, 20); //setting the time label on screen
points = new JLabel("Points: 0");
points.setBounds(100,10,100,20);
/*adding both components in jpanel*/
add(time);
add(points);
addKeyListener(new KeyAdapter(){
public void keyPressed(KeyEvent ke){
if(ke.getKeyCode() == ke.VK_LEFT & x_basket>10){
x_basket-=30;
repaint(); // redraw at new position
}
if(ke.getKeyCode() == ke.VK_RIGHT & x_basket<1000){
x_basket+=30; // redraw at new position
repaint();
}
}
});
}
void fallCoin(){
if(y_coin >=1650){
y_coin = 0;
x_coin = rand.nextInt(1000);
}
else
y_coin++;
}
void updateTime(){
counter++;
if(counter == 3000) //we count to 60 and then dec timeleft by 1 for slowing speed
{
timeleft--; //dec time left after 60 counts
counter = 0; //reset counter
}
time.setText("Time:"+timeleft);
}
void detectCollision(){
Rectangle basketRect = new Rectangle(x_basket,y_basket,100,65); //making a rectangle on the basket
Rectangle coinRect = new Rectangle(x_coin,y_coin,45,67); //making a rectangle on coin
if(coinRect.intersects(basketRect)){
pointsCount+=5; // give 5 points on each catch
points.setText("Points:"+pointsCount); // set the count
y_coin = 0; // for next coin
x_coin = rand.nextInt(1000); // again randomizing x axis of coin
}
}//end collision detection
void checkGameOver(){
if(timeleft <= 0)
{
JLabel yourScore = new JLabel("Your SCORE :" + pointsCount);
tempbkg = gameOverbkg;
yourScore.setBounds(400, 400, 200, 100);
gameOver = true;
yourScore.setForeground(Color.RED);
add(yourScore);
}
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.drawImage(tempbkg,0,0,null); //game background
checkGameOver();
if(gameOver == false){
setFocusable(true);
grabFocus();
updateTime();
fallCoin();
detectCollision();
g2d.drawImage(coin, x_coin, y_coin,null); //drawing coin at new position
g2d.drawImage(basket, x_basket, y_basket, null); //drawing basket
}
repaint();
}
}
/////////////////////////// Catch the Money Game Panel \\\\\\\\\\\\\\\\\\\\\\\\\
public class Game extends JFrame{
static MenuPanel mp = new MenuPanel();
static HelpPanel hp = new HelpPanel();
static GamePanel gp = new GamePanel();
static CardLayout cl = new CardLayout();
static JPanel cards = new JPanel(); // to contain the panels as cards
Game(){
cards.setLayout(cl);// setting the layout to cardlayout
cards.add(mp, "MenuPanel");
cards.add(hp, "HelpPanel");
cards.add(gp, "GamePanel");
cl.show(cards, "MenuPanel");
add(cards); //adding the panel with cardlayout in JFrame
setTitle("Catch The Money Game");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(1024, 700); //frame size
setVisible(true); //frame visibility
}
public static void main(String args[]){
Game game = new Game();
}
}
下降速度的问题可能就在这里
void fallCoin(){
if(y_coin >=1650){
y_coin = 0;
x_coin = rand.nextInt(1000);
}
else
y_coin++;
}
但我不能放 y_coin = y_coin + 0.5（或其他）