我是一名高中生,目前正在使用Java Swing(JFrame)和NetBeans IDE 8.0.2开发贪吃蛇游戏(吃食物版本)。到目前为止,我已经能够移动蛇并随机生成食物; 虽然蛇正在吃食物,但当与边界碰撞时会停止。但说实话,我真的不知道如何让蛇变长。有人建议我使用ArrayList,以便我可以添加同一块(Jpanel)的多个部分。说实话,我对ArrayList不太熟悉。所以你们能帮我解决如何创建该ArrayList并将其用于使蛇变长吗?此外,在蛇向前移动(任何方向)时,如何防止蛇向后移动(相反于向前按钮),它不应该只能向左、右和前进移动。我希望你们明白我的意思。最后,由于我的食物是随机生成的,有时会与蛇重叠,我该如何防止食物重叠在蛇身上。
这个链接会展示游戏的样子(红色块是我的蛇): http://i.stack.imgur.com/xko2n.jpg 在上面的链接中,红色块是我的蛇,黄色块是我的食物,额外的一块是我想要添加到蛇身上并使其生长的块。那里的蓝线是我的边界。
以下是我的代码:
这个链接会展示游戏的样子(红色块是我的蛇): http://i.stack.imgur.com/xko2n.jpg 在上面的链接中,红色块是我的蛇,黄色块是我的食物,额外的一块是我想要添加到蛇身上并使其生长的块。那里的蓝线是我的边界。
以下是我的代码:
package culminating;
import java.util.Random;
import javax.swing.JLabel;
import javax.swing.Timer;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Rectangle;
import javax.swing.JOptionPane;
public class Visual extends javax.swing.JFrame {
JLabel[] food = new JLabel[10];
JLabel[] border = new JLabel[4];
Timer s_timer;
boolean[] keys = new boolean[525];
boolean up = false, down = false;
int count;
static int X,Y, lcount;
public Visual() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
snake = new javax.swing.JLabel();
jLabel8 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel10 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jLabel1 = new javax.swing.JLabel();
jLabel11 = new javax.swing.JLabel();
jLabel12 = new javax.swing.JLabel();
jLabel13 = new javax.swing.JLabel();
jLabel14 = new javax.swing.JLabel();
jLabel15 = new javax.swing.JLabel();
jLabel18 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
addComponentListener(new java.awt.event.ComponentAdapter() {
public void componentShown(java.awt.event.ComponentEvent evt) {
formComponentShown(evt);
}
});
addKeyListener(new java.awt.event.KeyAdapter() {
public void keyPressed(java.awt.event.KeyEvent evt) {
formKeyPressed(evt);
}
});
jPanel1.setBackground(new java.awt.Color(0, 0, 0));
jPanel1.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyPressed(java.awt.event.KeyEvent evt) {
jPanel1KeyPressed(evt);
}
});
jPanel1.setLayout(null);
snake.setBackground(new java.awt.Color(255, 51, 0));
snake.setOpaque(true);
jPanel1.add(snake);
snake.setBounds(230, 230, 20, 20);
jLabel8.setBackground(new java.awt.Color(255, 255, 0));
jLabel8.setOpaque(true);
jPanel1.add(jLabel8);
jLabel8.setBounds(100, 184, 10, 10);
jLabel2.setBackground(new java.awt.Color(255, 255, 0));
jLabel2.setOpaque(true);
jPanel1.add(jLabel2);
jLabel2.setBounds(225, 137, 10, 10);
jLabel10.setBackground(new java.awt.Color(255, 255, 0));
jLabel10.setOpaque(true);
jPanel1.add(jLabel10);
jLabel10.setBounds(419, 305, 10, 10);
jLabel7.setBackground(new java.awt.Color(255, 255, 0));
jLabel7.setOpaque(true);
jPanel1.add(jLabel7);
jLabel7.setBounds(301, 137, 10, 10);
jLabel4.setBackground(new java.awt.Color(255, 255, 0));
jLabel4.setOpaque(true);
jPanel1.add(jLabel4);
jLabel4.setBounds(158, 325, 10, 10);
jLabel5.setBackground(new java.awt.Color(255, 255, 0));
jLabel5.setForeground(new java.awt.Color(51, 0, 51));
jLabel5.setOpaque(true);
jPanel1.add(jLabel5);
jLabel5.setBounds(412, 381, 10, 10);
jLabel9.setBackground(new java.awt.Color(255, 255, 0));
jLabel9.setOpaque(true);
jPanel1.add(jLabel9);
jLabel9.setBounds(503, 325, 10, 10);
jLabel3.setBackground(new java.awt.Color(255, 255, 0));
jLabel3.setOpaque(true);
jPanel1.add(jLabel3);
jLabel3.setBounds(410, 220, 10, 10);
jLabel6.setBackground(new java.awt.Color(255, 255, 0));
jLabel6.setOpaque(true);
jPanel1.add(jLabel6);
jLabel6.setBounds(432, 99, 10, 10);
jLabel1.setBackground(new java.awt.Color(255, 255, 0));
jLabel1.setOpaque(true);
jPanel1.add(jLabel1);
jLabel1.setBounds(510, 400, 10, 10);
jLabel11.setBackground(new java.awt.Color(51, 51, 255));
jLabel11.setOpaque(true);
jPanel1.add(jLabel11);
jLabel11.setBounds(0, 0, 20, 460);
jLabel12.setBackground(new java.awt.Color(51, 51, 255));
jLabel12.setOpaque(true);
jPanel1.add(jLabel12);
jLabel12.setBounds(0, 450, 560, 0);
jLabel13.setBackground(new java.awt.Color(51, 51, 255));
jLabel13.setOpaque(true);
jPanel1.add(jLabel13);
jLabel13.setBounds(0, 0, 560, 20);
jLabel14.setBackground(new java.awt.Color(51, 51, 255));
jLabel14.setOpaque(true);
jPanel1.add(jLabel14);
jLabel14.setBounds(540, 0, 20, 460);
jLabel15.setBackground(new java.awt.Color(51, 51, 255));
jLabel15.setOpaque(true);
jPanel1.add(jLabel15);
jLabel15.setBounds(0, 450, 560, 14);
jLabel18.setIcon(new javax.swing.ImageIcon(getClass().getResource("/culminating/snake body.jpg"))); // NOI18N
jLabel18.setText("jLabel17");
jPanel1.add(jLabel18);
jLabel18.setBounds(150, 350, 20, 20);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, 556, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, 463, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void formComponentShown(java.awt.event.ComponentEvent evt) {
this.requestFocusInWindow();
food[0]=jLabel1;
food[1]=jLabel2;
food[2]=jLabel3;
food[3]=jLabel4;
food[4]=jLabel5;
food[5]=jLabel6;
food[6]=jLabel7;
food[7]=jLabel8;
food[8]=jLabel9;
food[9]=jLabel10;
Random h = new Random();
Random v = new Random();
border[0]=jLabel11;
border[1]=jLabel13;
border[2]=jLabel14;
border[3]=jLabel15;
System.out.println(jLabel1.getX());
System.out.println(jLabel1.getY());
this.setBounds(0, 0, 570, 500);
food[0].setLocation(h.nextInt(490)+20, v.nextInt(412)+20);
food[1].setLocation(h.nextInt(490)+20, v.nextInt(412)+20);
food[2].setLocation(h.nextInt(490)+20, v.nextInt(412)+20);
food[3].setLocation(h.nextInt(490)+20, v.nextInt(412)+20);
food[4].setLocation(h.nextInt(490)+20, v.nextInt(412)+20);
food[5].setLocation(h.nextInt(490)+20, v.nextInt(412)+20);
food[6].setLocation(h.nextInt(490)+20, v.nextInt(412)+20);
food[7].setLocation(h.nextInt(490)+20, v.nextInt(412)+20);
food[8].setLocation(h.nextInt(490)+20, v.nextInt(412)+20);
food[9].setLocation(h.nextInt(490)+20, v.nextInt(412)+20);
s_timer = new Timer(50, new SnakeAction());
s_timer.start();
X=snake.getX();
Y=snake.getY();
}
private void jPanel1KeyPressed(java.awt.event.KeyEvent evt) {
}
private void formKeyPressed(java.awt.event.KeyEvent evt) {
System.out.println(evt.getKeyCode());
switch( evt.getKeyCode()){
case 37:
case 39:
case 32:
case 38:
case 40:
if (keys[evt.getKeyCode()]==false){
keys[37]=false;
keys[39]=false;
keys[32]=false;
keys[38]=false;
keys[40]=false;
keys[evt.getKeyCode()] = true;
}
break;
}
}
class SnakeAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
String infoMessage, titleBar;
if(keys[37]){ //left arrow
up =false;
down = false;
checkCollision();
if(!borderCollision(snake.getX()-10,snake.getY(),snake.getWidth(),snake.getHeight())){
X-=10;
snake.setLocation(X, Y);
}
}
if(keys[39]){ //right arrow
up = false;
down = false;
checkCollision();
if(!borderCollision(snake.getX()+10,snake.getY(),snake.getWidth(),snake.getHeight())){
X+=10;
snake.setLocation(X, Y);
}
}
if(keys[38]){ // up
up=true;
checkCollision();
if(!borderCollision(snake.getX(),snake.getY()-7,snake.getWidth(),snake.getHeight())){
Y-=10;
snake.setLocation(X, Y);
}
}
if(keys[40]){ //down
down=true;
checkCollision();
if(!borderCollision(snake.getX(),snake.getY()+7,snake.getWidth(),snake.getHeight())){
Y+=10;
snake.setLocation(X, Y);
}
}
}
}
public void checkCollision(){
boolean collision=false;
Rectangle c1,c2=snake.getBounds();
for(int i=0;i<=9;i++){
c1=food[i].getBounds();
if(c1.intersects(c2))food[i].setVisible(false);
}
}
public boolean borderCollision(int x, int y, int w, int h){
boolean collide = false;
Rectangle r1,r2=snake.getBounds();
r2.x=x;
r2.y=y;
r2.width=w;
r2.height=h;
for(int c=0; c<=3;c++){
r1=border[c].getBounds();
if(r1.intersects(r2)){
collide=true;
}
}
return collide;
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Visual().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel10;
private javax.swing.JLabel jLabel11;
private javax.swing.JLabel jLabel12;
private javax.swing.JLabel jLabel13;
private javax.swing.JLabel jLabel14;
private javax.swing.JLabel jLabel15;
private javax.swing.JLabel jLabel18;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JPanel jPanel1;
private javax.swing.JLabel snake;
// End of variables declaration
}
代码解释:我创建了两个数组,一个是食物的位置,另一个是边界的位置。每个食物都会在不同的位置随机生成。Jlabel 1到10是我的食物,而Jlabel 11、13、14和15则是我的边界。我有一个定时器控制蛇的移动。我使用了上[键38]、下[键40]、左[键37]和右[键39]箭头来控制蛇的移动。食物会在不同的位置随机生成。当蛇与食物碰撞时,我使用setvisible函数隐藏食物;当蛇与边界/边界碰撞时,它停止移动。