我已经好几天了解这个问题。 我在这个论坛上搜索过，并在谷歌搜索没有任何运气的解决方案。 我的问题是我无法制作一个有效的BFS算法来管理pacman ghost的行为。我想我忽略了代码中的一些东西。 我会在这里粘贴代码，如果你能帮助我，我会感谢你:) pacman是2号，幽灵是3号。
Queue<Tile> path = new LinkedList<>();
Tile start = new Tile(canvas.g1.x, canvas.g1.y, 3);
Tile end = new Tile(canvas.pacman.x, canvas.pacman.y, 2);
start.distance = 1;
path.add(start);
while (!path.isEmpty()) {
Tile current = path.remove();
System.out.println(path.size());
canvas.walls[current.y][current.x] = 0;
if (canvas.walls[current.y][current.x] == canvas.walls[end.y][end.x]) {
end = current;
System.out.println("pacman found");
break;
}
ArrayList<Tile> list = adyacent(current);
for (Tile c : list) {
if (c.distance == 0) {
c.distance = current.distance + 1;
path.add(c);
canvas.walls[c.y][c.x] = 20;
for (Tile v : path) {
System.out.println("x: " + v.x + " / y: " + v.y + " /
distance: " + v.distance);
}
}
}
}
int dist = end.distance;
System.out.println("Recolection ended, size: " + dist);
Tile（）类：
public class Tile {
public int x;
public int y;
public int distance;
public int personaje;
public Tile(int x, int y, int personaje) {
this.x = x;
this.y = y;
this.personaje = personaje;
distance = 0;
}
}
和方法adyacent（）：
在这种方法中，我检查的数字是有墙的（每一个都有不同的图））
public ArrayList<Tile> adyacent(Tile c) {
ArrayList<Tile> surrounding = new ArrayList<>();
int ant;
ant = canvas.walls[c.y][c.x + 1];
if ((ant != 7) && (ant != 8) && (ant != 9) && (ant != 11)
&& (ant != 12) && (ant != 13) && (ant != 14) && (ant != 15)
&& (ant != 16)) {
surrounding.add(new Tile(c.x + 1, c.y, 3));
}
ant = canvas.walls[c.y][c.x - 1];
if ((ant != 7) && (ant != 8) && (ant != 9) && (ant != 11)
&& (ant != 12) && (ant != 13) && (ant != 14) && (ant != 15)
&& (ant != 16)) {
surrounding.add(new Tile(c.x - 1, c.y, 3));
}
ant = canvas.walls[c.y + 1][c.x];
if ((ant != 7) && (ant != 8) && (ant != 9) && (ant != 11)
&& (ant != 12) && (ant != 13) && (ant != 14) && (ant != 15)
&& (ant != 16)) {
surrounding.add(new Tile(c.x, c.y + 1, 3));
}
ant = canvas.walls[c.y - 1][c.x];
if ((ant != 7) && (ant != 8) && (ant != 9) && (ant != 11)
&& (ant != 12) && (ant != 13) && (ant != 14) && (ant != 15)
&& (ant != 16)) {
surrounding.add(new Tile(c.x, c.y - 1, 3));
}
return surrounding;
}
我观察到的是它永远不会到达我返回路径大小的System.out。 此外，在我看到队列的大小时，似乎是正确的，但我看到的System.out＆＃34; x＆＃34;和＆＃34; y＆＃34;和＆＃34;距离＆＃34;每次都更大，更大。
我设置被检查的瓷砖改变它的颜色，改变我在数组中得到的数字：0是地板，20是透明绿色。并且它仍然处于中心位置，并且开始工作越来越慢。
忘了说它永远找不到pacman :( 谢谢！
答案 0 :(得分：0)
我必须创建一个布尔数组来检查是否已经访问过tile，以及一个距离的int数组。
使用布尔数组我可以不再访问访问过的图块，因此算法能够完成。 通过距离数组，我能够比较距离，以获得在第二次检查时较小的距离。这样我就能找到路径。
更改代码中的一些内容允许我使用两个数组来最终完成程序。
这是代码（变量名是西班牙语，因为我来自西班牙，它是为了上课，但我知道我应该用英语编码，而且我通常在做自己的项目时这样做）：
package comecocos;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.Queue;
public class Ghost1Thread extends Thread {
int x;
int y;
Juego canvas;
Ventana ventana;
boolean pause;
int[][] control;
int anterior;
int acelerar;
Pacman pacman;
int ignorar;
int salir;
/*AUMENTA DE VELOCIDAD CUANDO PACMAN COME VARIOS PUNTOS*/
public Ghost1Thread(Juego canvas, Ventana ventana) {
this.canvas = canvas;
this.ventana = ventana;
this.pacman = canvas.pacman;
this.control = canvas.paredes;
pause = true;
}
@Override
public void run() {
while(true) {
mover();
canvas.repaint();
try {
sleep(acelerar);
} catch (InterruptedException ex) {
System.out.println("Error durmiendo.");
}
}
}
public void mover() {
if (!pause) {
if (canvas.bolitas < 100 && canvas.g1.owned == false) {
acelerar = 200;
} else if ((canvas.bolitas < 100 && canvas.g1.owned == true) || (canvas.bolitas >= 100 && canvas.g1.owned == true)) {
acelerar = 450;
} else if (canvas.bolitas > 100 && canvas.g1.owned == false) {
acelerar = 300;
}
if (canvas.g1.owned == false) {
canvas.gh1[canvas.g1.y][canvas.g1.x] = 0;
canvas.g1.x = buscar(canvas.pacman.x, canvas.pacman.y).x;
canvas.g1.y = buscar(canvas.pacman.x, canvas.pacman.y).y;
canvas.gh1[canvas.g1.y][canvas.g1.x] = 3;
} else {
if (canvas.pacman.x > canvas.g1.x) {
izquierda();
}
if (canvas.pacman.x < canvas.g1.x) {
derecha();
}
if (canvas.pacman.y < canvas.g1.y) {
abajo();
}
if (canvas.pacman.y > canvas.g1.y) {
arriba();
}
}
}
}
public Casilla buscar(int x, int y) {
this.x = x;
this.y = y;
Queue<Casilla> camino = new LinkedList<>();
boolean [][] descubierto = new boolean[canvas.columnas][canvas.filas];
int [][] distancias = new int[canvas.columnas][canvas.filas];
for (int i = 0; i < canvas.columnas; i++) {
for (int j = 0; j < canvas.filas; j++) {
descubierto[i][j] = false;
}
}
for (int i = 0; i < canvas.columnas; i++) {
for (int j = 0; j < canvas.filas; j++) {
distancias[i][j] = 0;
}
}
Casilla inicio = new Casilla(canvas.g1.x, canvas.g1.y, 3);
Casilla fin = new Casilla(x, y, 2);
inicio.distancia = 1;
camino.add(inicio);
while (!camino.isEmpty()) {
Casilla actual = camino.remove();
if (canvas.paredes[actual.y][actual.x] == canvas.paredes[fin.y][fin.x]) {
fin = actual;
}
ArrayList<Casilla> lista = adyacente(actual);
for (Casilla c : lista) {
if (c.distancia == 0 && descubierto[c.x][c.y] == false) {
c.distancia = actual.distancia + 1;
descubierto[c.x][c.y] = true;
distancias[c.x][c.y] = c.distancia;
camino.add(c);
}
}
}
int dist = fin.distancia;
camino.add(fin);
while (!camino.isEmpty()) {
Casilla actual = camino.remove();
ArrayList<Casilla> lista = adyacente(actual);
for (Casilla c : lista) {
if (distancias[c.x][c.y] < dist) {
if (distancias[c.x][c.y] == 2){
return c;
} else {
dist = distancias[c.x][c.y];
descubierto[c.x][c.y] = false;
camino.add(c);
}
}
}
}
return fin;
}
public ArrayList<Casilla> adyacente(Casilla c) {
ArrayList<Casilla> alrededor = new ArrayList<>();
int ant;
if (c.x > 0 && c.x < canvas.columnas - 1 && c.y > 0 && c.y < canvas.filas) {
ant = canvas.paredes[c.y][c.x + 1];
if ((ant != 7) && (ant != 8) && (ant != 9) && (ant != 11)
&& (ant != 12) && (ant != 13) && (ant != 14) && (ant != 15)
&& (ant != 16)) {
alrededor.add(new Casilla(c.x + 1, c.y, 3));
}
ant = canvas.paredes[c.y][c.x - 1];
if ((ant != 7) && (ant != 8) && (ant != 9) && (ant != 11)
&& (ant != 12) && (ant != 13) && (ant != 14) && (ant != 15)
&& (ant != 16)) {
alrededor.add(new Casilla(c.x - 1, c.y, 3));
}
ant = canvas.paredes[c.y + 1][c.x];
if ((ant != 7) && (ant != 8) && (ant != 9) && (ant != 11)
&& (ant != 12) && (ant != 13) && (ant != 14) && (ant != 15)
&& (ant != 16)) {
alrededor.add(new Casilla(c.x, c.y + 1, 3));
}
ant = canvas.paredes[c.y - 1][c.x];
if ((ant != 7) && (ant != 8) && (ant != 9) && (ant != 11)
&& (ant != 12) && (ant != 13) && (ant != 14) && (ant != 15)
&& (ant != 16)) {
alrededor.add(new Casilla(c.x, c.y - 1, 3));
}
}
return alrededor;
}
private void arriba() {
anterior = canvas.paredes[canvas.g1.y - 1][canvas.g1.x];
if ((anterior != 7) && (anterior != 8) && (anterior != 9) && (anterior != 11)
&& (anterior != 12) && (anterior != 13) && (anterior != 14) && (anterior != 15)
&& (anterior != 16) && noFantasma(canvas.gh1[canvas.g1.y - 1][canvas.g1.x],
canvas.gh2[canvas.g1.y - 1][canvas.g1.x],
canvas.gh3[canvas.g1.y - 1][canvas.g1.x],
canvas.gh4[canvas.g1.y - 1][canvas.g1.x])) {//Si no hay muro ni otro fantasma
canvas.gh1[canvas.g1.y][canvas.g1.x] = 0;
canvas.g1.y = canvas.g1.y - 1;//Cambio fila
canvas.gh1[canvas.g1.y][canvas.g1.x] = 3;//Dibulo
} else if (anterior == 2) {
if (canvas.g1.owned) {
canvas.gh1[canvas.g1.y][canvas.g1.x] = 0;
canvas.g1.x = 12;
canvas.g1.y = 15;
canvas.gh1[15][12] = 3;
canvas.g1.owned = false;
ventana.npuntuacion += 200;
} else if (canvas.g1.owned == false) {
if (canvas.vidas <= 1) {
canvas.vidas = 0;
} else {
vidaMenos();
}
ventana.npuntuacion -= 200;
}
}
}
private void derecha() {
try {
anterior = canvas.paredes[canvas.g1.y][canvas.g1.x + 1];
} catch (Exception e) {
anterior = 17;
}
if ((anterior != 7) && (anterior != 8) && (anterior != 9) && (anterior != 11)
&& (anterior != 12) && (anterior != 13) && (anterior != 14) && (anterior != 15)
&& (anterior != 16) && noFantasma(canvas.gh1[canvas.g1.y][canvas.g1.x + 1],
canvas.gh2[canvas.g1.y][canvas.g1.x + 1],
canvas.gh3[canvas.g1.y][canvas.g1.x + 1],
canvas.gh4[canvas.g1.y][canvas.g1.x + 1])) {//Si no hay muro
try {
canvas.gh1[canvas.g1.y][canvas.g1.x] = 0;
canvas.g1.x = canvas.g1.x + 1;//Cambio fila
canvas.gh1[canvas.g1.y][canvas.g1.x] = 3;//Dibulo
} catch (Exception e) {
canvas.g1.x = canvas.g1.x - 1;
canvas.paredes[canvas.g1.y][canvas.g1.x] = 17;
canvas.g1.x = canvas.g1.x - 27;
canvas.gh1[canvas.g1.y][canvas.g1.x] = 3;//Dibulo
}
} else if (anterior == 2) {
if (canvas.g1.owned) {
canvas.gh1[canvas.g1.y][canvas.g1.x] = 0;
canvas.g1.x = 12;
canvas.g1.y = 15;
canvas.gh1[15][12] = 3;
canvas.g1.owned = false;
ventana.npuntuacion += 200;
} else if (canvas.g1.owned == false) {
if (canvas.vidas <= 1) {
canvas.vidas = 0;
} else {
vidaMenos();
}
ventana.npuntuacion -= 200;
}
}
}
private void abajo() {
anterior = canvas.paredes[canvas.g1.y + 1][canvas.g1.x];
if ((anterior != 7) && (anterior != 8) && (anterior != 9) && (anterior != 11)
&& (anterior != 12) && (anterior != 13) && (anterior != 14) && (anterior != 15)
&& (anterior != 16) && noFantasma(canvas.gh1[canvas.g1.y + 1][canvas.g1.x],
canvas.gh2[canvas.g1.y + 1][canvas.g1.x],
canvas.gh3[canvas.g1.y + 1][canvas.g1.x],
canvas.gh4[canvas.g1.y + 1][canvas.g1.x])) {//Si no hay muro
canvas.gh1[canvas.g1.y][canvas.g1.x] = 0;
canvas.g1.y = canvas.g1.y + 1;//Cambio fila
canvas.gh1[canvas.g1.y][canvas.g1.x] = 3;//Dibulo
} else if (anterior == 2) {
if (canvas.g1.owned) {
canvas.gh1[canvas.g1.y][canvas.g1.x] = 0;
canvas.g1.x = 12;
canvas.g1.y = 15;
canvas.gh1[15][12] = 3;
canvas.g1.owned = false;
ventana.npuntuacion += 200;
} else if (canvas.g1.owned == false) {
if (canvas.vidas <= 1) {
canvas.vidas = 0;
} else {
vidaMenos();
}
ventana.npuntuacion -= 200;
}
}
}
private void izquierda() {
try {
anterior = canvas.paredes[canvas.g1.y][canvas.g1.x - 1];
} catch (Exception e) {
anterior = 18;
}
if ((anterior != 7) && (anterior != 8) && (anterior != 9) && (anterior != 11)
&& (anterior != 12) && (anterior != 13) && (anterior != 14) && (anterior != 15)
&& (anterior != 16) && noFantasma(canvas.gh1[canvas.g1.y][canvas.g1.x - 1],
canvas.gh2[canvas.g1.y][canvas.g1.x - 1],
canvas.gh3[canvas.g1.y][canvas.g1.x - 1],
canvas.gh4[canvas.g1.y][canvas.g1.x - 1])) {//Si no hay muro
try {
canvas.gh1[canvas.g1.y][canvas.g1.x] = 0;
canvas.g1.x = canvas.g1.x - 1;//Cambio fila
canvas.gh1[canvas.g1.y][canvas.g1.x] = 3;//Dibulo
} catch (Exception e) {
canvas.g1.x = canvas.g1.x + 1;
canvas.paredes[canvas.g1.y][canvas.g1.x] = 17;
canvas.g1.x = canvas.g1.x + 27;
canvas.gh1[canvas.g1.y][canvas.g1.x] = 3;//Dibulo
}
} else if (anterior == 2) {
if (canvas.g1.owned) {
canvas.gh1[canvas.g1.y][canvas.g1.x] = 0;
canvas.g1.x = 12;
canvas.g1.y = 15;
canvas.gh1[15][12] = 3;
canvas.g1.owned = false;
ventana.npuntuacion += 200;
} else if (canvas.g1.owned == false) {
if (canvas.vidas <= 1) {
canvas.vidas = 0;
} else {
vidaMenos();
}
ventana.npuntuacion -= 200;
}
}
}
private boolean noFantasma(int f1, int f2, int f3, int f4) {
if (f1 != 3 && f2 != 4 && f3 != 5 && f4 != 6) {
return true;
}
return false;
}
private void vidaMenos() {
canvas.vidas--;
canvas.gh1[canvas.g1.y][canvas.g1.x] = 0;
canvas.g1.x = 12;
canvas.g1.y = 15;
canvas.gh1[15][12] = 3;
canvas.gh2[canvas.g2.y][canvas.g2.x] = 0;
canvas.g2.x = 13;
canvas.g2.y = 15;
canvas.gh2[15][13] = 4;
canvas.gh3[canvas.g3.y][canvas.g3.x] = 0;
canvas.g3.x = 14;
canvas.g3.y = 15;
canvas.gh3[15][14] = 5;
canvas.gh4[canvas.g4.y][canvas.g4.x] = 0;
canvas.g4.x = 15;
canvas.g4.y = 15;
canvas.gh4[15][15] = 6;
canvas.paredes[canvas.pacman.y][canvas.pacman.x] = 0;
canvas.pacman.x = 13;
canvas.pacman.y = 23;
canvas.paredes[23][13] = 2;
}
}
我也知道可能会做得更好，也许你们中的很多人都想踢我的屁股......但是我只有一个星期来完成整个项目而且我是一个完整的java菜鸟，所以我做了我最好的。 祝你有愉快的一天：）