import codes.myGame.snake.cell.Lattice;
 
import java.util.Random;
 
public class Smap {
 private boolean getFood = false;//如果得到食物，該指針設為true，并且在隨后的autoChange里增加蛇的長度
 private boolean gameOver = false;
 private boolean directionChange = false;//這里標志的作用是保證在一次運動期間只會進行一次轉向，使游戲更流暢
 private int MAP_SIZE;
 private Lattice[][] map;
 private int directionX = 0;//下一次頭在當前位置的哪個方向上
 private int directionY = 1;//下一次頭在當前位置的哪個方向上
 private int[] head = new int[2];//記錄當前頭的位置
 private int[] food = new int[2];//記錄當前食物的位置
 
 public Smap(int size) {
 MAP_SIZE = size;
 map = new Lattice[MAP_SIZE][MAP_SIZE];
 for(int i=0;i<size;i++){
 for (int j = 0 ;j<size;j++){
 map[i][j] = new Lattice();
 }
 }
 map[MAP_SIZE/2][MAP_SIZE/2].setHead(true,map[MAP_SIZE/2][MAP_SIZE/2-1]);//初始化設置一個頭結點，以及他的尾節(jié)點
 head[0] = MAP_SIZE/2;
 head[1] = MAP_SIZE/2;
 map[MAP_SIZE/2][MAP_SIZE/2-1].setRear(true,null);
 this.randFood();
 }
 
 //模擬蛇的自動移動
 public void autoChange(){
 this.setHead();
 if(food[0]==head[0] && food[1]==head[1]){//如果新的頭部碰觸到了食物，那么尾部增長
 getFood = true;
 }
 if(!gameOver)this.setRear();
 if(getFood)this.randFood();
 directionChange = false;
 }
 
 //根據(jù)鍵盤事件，改變頭的下一次移動方向，注意 該移動方向是僅針對頭部的
 //setDirection和setHead兩個方法需要互斥進行，這里單線程，用synchronized即可
 //(否則，如果當前頭部在邊界位置，連續(xù)變幻方向可能導致在setHead里發(fā)生溢出)
 public synchronized void setDirection(int x,int y){
 if(directionY!=y && directionX!=x &&!directionChange){
 directionX = x;
 directionY = y;
 directionChange = true;
 }
 }
 
 public boolean gameOver(){
 return gameOver;//頭碰到身子，證明gameOver
 }
 private synchronized void setHead(){
 int i = head[0];
 int j = head[1];
 head[0] = ( head[0] + directionX + MAP_SIZE)%MAP_SIZE;
 head[1] = ( head[1] + directionY + MAP_SIZE )%MAP_SIZE;
 if(map[head[0]][head[1]].isBody())gameOver = true;
 map[head[0]][head[1]].setHead(true,map[i][j]);
 map[i][j].setBody(true,null);
 map[i][j].setHead(false,null); //傳入null表示不改變當前指向
 }
 
 //設置尾巴由于沒法像頭部那樣直接設置，這里只能采用鏈表遍歷的方式獲取尾巴
 private void setRear(){
 if(!getFood){
 Lattice temp = map[head[0]][head[1]];
 while (!temp.next.isRear())temp = temp.next;
 temp.next().setRear(false,null);
 temp.setRear(true,null);
 temp.setBody(false,null);
 }
 }
 
 private void randFood(){
 getFood = false;
 map[food[0]][food[1]].setFood(false);//先把當前的食物取消掉
 boolean flag = false;//設置下一個食物
 Random random = new Random();
 int x = random.nextInt(MAP_SIZE);
 int y = random.nextInt(MAP_SIZE);
 while (!flag){
 x = random.nextInt(MAP_SIZE);
 y = random.nextInt(MAP_SIZE);
 if(!map[x][y].isHead() && !map[x][y].isRear() &&!map[x][y].isBody())flag = true;
 }
 map[x][y].setFood(true);
 food[0] = x;
 food[1] = y;
 }
 
 public Lattice get(int row, int col){
 return map[row][col];
 }
 
 public int getMAP_SIZE() {
 return MAP_SIZE;
 }
}

public class Lattice {
 private boolean isBody = false;
 private boolean isHead = false;
 private boolean isFood = false;
 private boolean isRear = false;
 public Lattice next = null;
 
 
 public void setHead(boolean bool,Lattice next){
 isHead = bool;
 if(next!=null)this.next = next;
 }
 public void setBody(boolean bool,Lattice next){
 isBody = bool;
 if(next!=null)this.next = next; //傳入?yún)?shù)為null時，不改變當前的next
 }
 public void setRear(boolean bool,Lattice next){
 isRear = bool;
 this.next = next;
 }
 public void setFood(boolean bool){
 isFood = bool;
 }
 
 public Lattice next(){
 return next;
 }
 
 public boolean isHead(){
 return isHead;
 }
 public boolean isFood(){
 return isFood;
 }
 public boolean isRear(){
 return isRear;
 }
 public boolean isBody(){
 return isBody;
 }
 
 
 
 public void refresh(){
 if(isHead){
 isBody = true;
 isHead = false;
// 怎么設置下一個頭呢？（考慮把DirectionX,Y放到Smap里，而不是這里）
 }else if(isBody){
 if(next.isRear){
 next.isRear = false;
 isRear = true;
 isBody = false;
 }
 }
 }
// 在這里設置細胞可見
 public void draw(Graphics g, int x, int y, int size) {
 g.setColor(black);
 g.drawRect(x, y, size, size);
 if ( isHead ) {
 g.setColor( red);
 g.fillRect(x, y, size, size);
 }else if ( isBody || isRear) {
 g.setColor(black);
 g.fillRect(x, y, size, size);
 }else if(isFood){
 g.setColor( blue);
 g.fillRect(x, y, size, size);
 }
 }
}

import codes.myGame.snake.cell.Lattice;
import javax.swing.*;
import java.awt.*;
 
 
public class View extends JPanel {
 private static final long serialVersionUID = -5258995676212660595L;
 private static final int GRID_SIZE = 32; //填充的像素數(shù)量
 private Smap thisMap;
 
 public View(Smap map) {
 thisMap = map;
 }
 
 @Override
 public void paint(Graphics g) {
 super.paint(g);
 int size = thisMap.getMAP_SIZE();
 for (int row = 0; row< size; row++ ) {
 for (int col = 0; col< size; col++ ) {
 Lattice lattice = thisMap.get(row, col);
 if ( lattice != null ) {
 lattice.draw(g, col*GRID_SIZE, row*GRID_SIZE, GRID_SIZE);//對應的格子的顯示
 }
 }
 }
 }
 @Override
 public Dimension getPreferredSize() {//創(chuàng)建該div大小
 return new Dimension(thisMap.getMAP_SIZE()*GRID_SIZE+1, thisMap.getMAP_SIZE()*GRID_SIZE+1);
 }
}