# 自己实现迷宫算法并且打印出最优路径

``````package cn.itcast.shujujiegou.Swing;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.util.Random;
import java.util.Stack;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
class Lattice {
static final int INTREE = 1;
static final int NOTINTREE = 0;
private int x = -1;
private int y = -1;
private int flag = NOTINTREE;
private Lattice father = null;
public Lattice(int xx, int yy) {
x = xx;
y = yy;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
public int getFlag() {
return flag;
}
public Lattice getFather() {
return father;
}
public void setFather(Lattice f) {
father = f;
}
public void setFlag(int f) {
flag = f;
}
public String toString() {
return new String("(" + x + "," + y + ")\n");
}
}
public class ja extends JPanel {
private static final long serialVersionUID = -8300339045454852626L;
private int NUM, width, padding;// width 每个格子的宽度和高度
private Lattice[][] maze;
private int ballX, ballY;
private boolean drawPath = false;
ja(int m, int wi, int p) {
NUM = m;
width = wi;
maze = new Lattice[NUM][NUM];
for (int i = 0; i <= NUM - 1; i++)
for (int j = 0; j <= NUM - 1; j++)
maze[i][j] = new Lattice(i, j);
createMaze();
setKeyListener();
this.setFocusable(true);
}
private void init() {
for (int i = 0; i <= NUM - 1; i++)
for (int j = 0; j <= NUM - 1; j++) {
maze[i][j].setFather(null);
maze[i][j].setFlag(Lattice.NOTINTREE);
}
ballX = 0;
ballY = 0;
drawPath = false;
createMaze();
// setKeyListener();
this.setFocusable(true);
repaint();
}
public int getCenterX(int x) {
return padding + x * width + width / 2;
}
public int getCenterY(int y) {
return padding + y * width + width / 2;
}

public int getCenterX(Lattice p) {
return padding + p.getY() * width + width / 2;
}
public int getCenterY(Lattice p) {
return padding + p.getX() * width + width / 2;
}
private void checkIsWin() {
if (ballX == NUM - 1 && ballY == NUM - 1) {
JOptionPane.showMessageDialog(null, "恭喜你!", "你走出了迷宫。",
JOptionPane.PLAIN_MESSAGE);
init();
}
}
synchronized private void move(int c) {
int tx = ballX, ty = ballY;
// System.out.println(c);
switch (c) {
case KeyEvent.VK_LEFT :
ty--;
break;
case KeyEvent.VK_RIGHT :
ty++;
break;
case KeyEvent.VK_UP :
tx--;
break;
case KeyEvent.VK_DOWN :
tx++;
break;
case KeyEvent.VK_SPACE :
if (drawPath == true) {
drawPath = false;
} else {
drawPath = true;
}
break;
default :
}
if (!isOutOfBorder(tx, ty)
&& (maze[tx][ty].getFather() == maze[ballX][ballY]
|| maze[ballX][ballY].getFather() == maze[tx][ty])) {
ballX = tx;
ballY = ty;
}
}
private void setKeyListener() {
public void keyPressed(KeyEvent e) {
int c = e.getKeyCode();
move(c);
repaint();
checkIsWin();

}
});
}
private boolean isOutOfBorder(Lattice p) {
return isOutOfBorder(p.getX(), p.getY());
}
private boolean isOutOfBorder(int x, int y) {
return (x > NUM - 1 || y > NUM - 1 || x < 0 || y < 0) ? true : false;
}
private Lattice[] getNeis(Lattice p) {
final int[] adds = {-1, 0, 1, 0, -1};// 顺序为上右下左
if (isOutOfBorder(p)) {
return null;
}
Lattice[] ps = new Lattice[4];// 顺序为上右下左
int xt;
int yt;
for (int i = 0; i <= 3; i++) {
yt = p.getY() + adds[i + 1];
if (isOutOfBorder(xt, yt))
continue;
ps[i] = maze[xt][yt];
}
return ps;
}
private void createMaze() {
Random random = new Random();
int rx = Math.abs(random.nextInt()) % NUM;
int ry = Math.abs(random.nextInt()) % NUM;
Stack s = new Stack();
Lattice p = maze[rx][ry];
Lattice neis[] = null;
s.push(p);
while (!s.isEmpty()) {
p = s.pop();
p.setFlag(Lattice.INTREE);
neis = getNeis(p);
int ran = Math.abs(random.nextInt()) % 4;
for (int a = 0; a <= 3; a++) {
ran++;
ran %= 4;
if (neis[ran] == null || neis[ran].getFlag() == Lattice.INTREE)
continue;
s.push(neis[ran]);
neis[ran].setFather(p);
}
}
// changeFather(maze[0][0],null);
}
private void changeFather(Lattice p, Lattice f) {
if (p.getFather() == null) {
p.setFather(f);
return;
} else {
changeFather(p.getFather(), p);
}
}
private void clearFence(int i, int j, int fx, int fy, Graphics g) {
int sx = padding + ((j > fy ? j : fy) * width),
sy = padding + ((i > fx ? i : fx) * width),
dx = (i == fx ? sx : sx + width),
dy = (i == fx ? sy + width : sy);
if (sx != dx) {
sx++;
dx--;
} else {
sy++;
dy--;
}
g.drawLine(sx, sy, dx, dy);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
for (int i = 0; i <= NUM; i++) {
}
for (int j = 0; j <= NUM; j++) {
}
g.setColor(this.getBackground());
for (int i = NUM - 1; i >= 0; i--) {
for (int j = NUM - 1; j >= 0; j--) {
Lattice f = maze[i][j].getFather();
if (f != null) {
int fx = f.getX(), fy = f.getY();
clearFence(i, j, fx, fy, g);
}
}
}
int last = padding + NUM * width;
g.drawLine(last, last - 1, last, last - width + 1);
g.setColor(Color.RED);
g.fillOval(getCenterX(ballY) - width / 3, getCenterY(ballX) - width / 3,
width / 2, width / 2);
if (drawPath == true)
drawPath(g);
}
private void drawPath(Graphics g) {
Color PATH_COLOR = Color.ORANGE, BOTH_PATH_COLOR = Color.PINK;
if (drawPath == true)
g.setColor(PATH_COLOR);
else
g.setColor(this.getBackground());
Lattice p = maze[NUM - 1][NUM - 1];
while (p.getFather() != null) {
p.setFlag(2);
p = p.getFather();
}
g.fillOval(getCenterX(p) - width / 3, getCenterY(p) - width / 3,
width / 2, width / 2);
p = maze[0][0];
while (p.getFather() != null) {
if (p.getFlag() == 2) {
p.setFlag(3);
g.setColor(BOTH_PATH_COLOR);
}
g.drawLine(getCenterX(p), getCenterY(p), getCenterX(p.getFather()),
getCenterY(p.getFather()));
p = p.getFather();
}
g.setColor(PATH_COLOR);
p = maze[NUM - 1][NUM - 1];
while (p.getFather() != null) {
if (p.getFlag() == 3)
break;
g.drawLine(getCenterX(p), getCenterY(p), getCenterX(p.getFather()),
getCenterY(p.getFather()));
p = p.getFather();
}
}
public static void main(String[] args) {
final int n = 30, width = 600, padding = 20, LX = 200, LY = 100;
``````