【发布时间】：2014-01-28 06:05:28
【问题描述】：
这是我正在开发的同一款游戏，但我又遇到了一个我无法理解的问题。我正在使用键绑定来移动我的精灵，它工作得很好！但由于这是一款蛇类游戏，我需要精灵继续移动而不会停止并改变方向并在玩家键入键后继续移动。我知道 KeyListener 是可能的，但我真的不想完全改变我的程序。如果可能的话，我只需要知道需要更改哪些代码。
除此之外，我还在研究蛇身的 x 和 y 坐标的两个数组，以便方块会跟随在头部后面，但我无法将其绘制出来。以及如何显示分数的整数。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
import java.util.ArrayList;
public class Snake2 extends JFrame {
/* Sprite: snake head co-ordinates */
int x = 400;
int y = 450;
int width = 10;
int height = 10;
/* Sprite: snake body */
int length = 0;
ArrayList <Integer> bodyX = new ArrayList <Integer>();
ArrayList <Integer> bodyY = new ArrayList <Integer>();
/* Score */
int point = 0;
/* Sprite: mouse co-ordinates */
Random rand = new Random();
int addx = (rand.nextInt(10))*10;
int addy = (rand.nextInt(10))*10;
int mx = ((rand.nextInt(5)+1)*100) + addx;
int my = ((rand.nextInt(6)+2)*100) + addy;
DrawPanel drawPanel = new DrawPanel();
public Snake2() {
addMouseListener(new MouseListener());
System.out.print(mx + " " + my);
/* move snake up */
Action upAction = new AbstractAction(){
public void actionPerformed(ActionEvent e) {
y -=10;
if (y >= my && y <= my+9 && x >= mx && x <= mx+9)
{
addx = (rand.nextInt(10))*10;
addy = (rand.nextInt(10))*10;
mx = ((rand.nextInt(5)+1)*100) + addx;
my = ((rand.nextInt(6)+1)*100) + addy;
point += 100;
length++;
bodyY.add(0, y);
}
if (y <99)
{
new GameOver();
dispose();
}
drawPanel.repaint();
}
};
/* move snake down */
Action downAction = new AbstractAction(){
public void actionPerformed(ActionEvent e) {
y +=10;
if (y >= my && y <= my+9 && x >= mx && x <= mx+9)
{
addx = (rand.nextInt(10))*10;
addy = (rand.nextInt(10))*10;
mx = ((rand.nextInt(5)+1)*100) + addx;
my = ((rand.nextInt(6)+1)*100) + addy;
point += 100;
length++;
bodyY.add(0, y);
}
if (y > 799)
{
new GameOver();
dispose();
}
drawPanel.repaint();
}
};
/* move snake left */
Action leftAction = new AbstractAction(){
public void actionPerformed(ActionEvent e) {
x -=10;
if (x >= mx && x <= mx+9 && y >= my && y <= my+9)
{
addx = (rand.nextInt(10))*10;
addy = (rand.nextInt(10))*10;
mx = ((rand.nextInt(5)+1)*100) + addx;
my = ((rand.nextInt(6)+1)*100) + addy;
point += 100;
length++;
bodyX.add(0, x);
}
if (x <99)
{
new GameOver();
dispose();
}
drawPanel.repaint();
}
};
/* move snake right */
Action rightAction = new AbstractAction(){
public void actionPerformed(ActionEvent e) {
x +=10;
if (x >= mx && x <= mx+9 && y >= my && y <= my+9)
{
addx = (rand.nextInt(10))*10;
addy = (rand.nextInt(10))*10;
mx = ((rand.nextInt(5)+1)*100) + addx;
my = ((rand.nextInt(6)+1)*100) + addy;
point += 100;
length++;
bodyX.add(0, x);
}
if (x > 699)
{
new GameOver();
dispose();
}
drawPanel.repaint();
}
};
InputMap inputMap = drawPanel.getInputMap(JPanel.WHEN_IN_FOCUSED_WINDOW);
ActionMap actionMap = drawPanel.getActionMap();
inputMap.put(KeyStroke.getKeyStroke("RIGHT"), "rightAction");
actionMap.put("rightAction", rightAction);
inputMap.put(KeyStroke.getKeyStroke("LEFT"), "leftAction");
actionMap.put("leftAction", leftAction);
inputMap.put(KeyStroke.getKeyStroke("DOWN"), "downAction");
actionMap.put("downAction", downAction);
inputMap.put(KeyStroke.getKeyStroke("UP"), "upAction");
actionMap.put("upAction", upAction);
add(drawPanel);
pack();
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}//Snake2()
private class GameOver extends JFrame implements ActionListener{
JLabel answer = new JLabel("");
JPanel pane = new JPanel(); // create pane object
JButton pressme = new JButton("Quit");
JButton replay = new JButton("Replay?");
GameOver() // the constructor
{
super("Game Over"); setBounds(100,100,300,200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container con = this.getContentPane(); // inherit main frame
con.add(pane); pressme.setMnemonic('Q'); // associate hotkey
pressme.addActionListener(this); // register button listener
replay.addActionListener(this);
pane.add(answer); pane.add(pressme); pane.add(replay); pressme.requestFocus();
answer.setText("You Lose");
setVisible(true); // make frame visible
}//GameOver()
// here is the basic event handler
public void actionPerformed(ActionEvent event)
{
Object source = event.getSource();
if (source == pressme)
System.exit(0);
if (source == replay)
{
dispose();
EventQueue.invokeLater(new Runnable(){
public void run(){
new Snake2();
}
});
}
}//actionPreformed
}//GameOver
private class DrawPanel extends JPanel {
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Font ith = new Font("Ithornît", Font.BOLD, 78);
/* Background: Snake */
g.setColor(Color.darkGray);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.gray);
g.fillRect(100,100,600,700);
g.setColor(Color.white);
g.drawRect(99,99,601,701);
g.drawString("Quit",102,86);
g.drawRect(100,70,30,20);
g.drawString("Score: ", 602, 86);
g.setFont(ith);
g.drawString("SNAKE",350,60);
/* Sprite: Mouse */
g.setColor(Color.black);
g.fillRect(mx, my, width, height);
//System.out.print(mx + " " + my);
/* Sprite: Snake Body */
if (length != 0){
for(int i = 0; i >= length; i++)
{
g.setColor(Color.darkGray);
g.fillRect(bodyX.get(i), bodyY.get(i), width, height);
}
}
/* Sprite: Snake head */
g.setColor(Color.white);
g.fillRect(x, y, width, height);
}//Paint Component
public Dimension getPreferredSize() {
return new Dimension(800, 850);
}//Dimension
}//DrawPanel
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable(){
public void run(){
new Snake2();
}
});
}// main
}//Snake Class
/* Tracks where mouse is clicked */
class MouseListener extends MouseAdapter {
public void mouseReleased(MouseEvent me) {
if (me.getX() >= 101 && me.getX() <= 131 && me.getY() >= 94 && me.getY() <= 115){
System.exit(0);
}
String str="Mouse Released at "+me.getX()+","+me.getY();
System.out.println(str);
}
}//MouseAdapter
【问题讨论】：
标签： java swing awt paint key-bindings