board.h
#ifndef BOARD_H
#define BOARD_H
#define MAX_X 40
#define MAX_Y 30
#define NORMAL_LABEL 0//普通label
#define BORDER_LABEL 1//边界label
#define SNAKE_LABEL 2//蛇身label
#define FOOD_LABEL 3//食物label
#include <QWidget>
#include <QLabel>
#include <QList>
#include <QTimer>
#include <QKeyEvent>
struct Node{
QLabel *label;
int type;//边界：1 蛇身：2 普通：0 食物：3
int x;
int y;
};
class Board : public QWidget
{
Q_OBJECT
public:
explicit Board(QWidget *parent = 0);
void init();
void drawBorder();//画边界
void initSnake();
void moveStep();
void getHeadTail();//得到头和尾
bool left();//判断是否能上下左右移动
bool right();
bool up();
bool down();
void keyPressEvent(QKeyEvent *e);//键盘事件
// void gameover();
// void showAllType();
void generateFood();//生成食物
signals:
public slots:
void slotMoveStep();//槽函数，可以当做普通函数使用
private:
Node *matrix[MAX_X][MAX_Y];
QList<Node*> snake;//蛇身
int dx, dy;
Node *head;//蛇头指针
Node *tail;//蛇尾指针
QTimer timer;
};
#endif // BOARD_Hboarder.cpp
#include "board.h"
#include <QDebug>
#include <QString>
#include <QTimer>
#include <QMessageBox>
#include <QKeyEvent>
#include <ctime>
Board::Board(QWidget *parent) :
QWidget(parent)
{
this->setWindowTitle("贪吃蛇");
init();//初始化
drawBorder();//画边界
initSnake();//初始化蛇身
moveStep();
generateFood();//初始化完就产生一个食物
connect(&timer, SIGNAL(timeout()), this, SLOT(slotMoveStep()));
timer.start(100);
}
void Board::init(){
int gridSize = 25;
for(int x = 0; x < MAX_X; x++){
for(int y = 0; y < MAX_Y; y++){
QLabel *label = new QLabel(this);
label->setStyleSheet("background:red");
label->setGeometry(x * gridSize, y * gridSize, gridSize - 1, gridSize - 1);
label->hide();
matrix[x][y]= new Node;
matrix[x][y]->label =label;
matrix[x][y]->type = NORMAL_LABEL;//将所有的都初始化成普通label
matrix[x][y]->x = x;
matrix[x][y]->y = y;
}
}
}
void Board::drawBorder(){//画边界
for(int x = 0; x < MAX_X; x++){
for(int y = 0; y < MAX_Y; y++){
if(x == 0 || x == MAX_X - 1 || y == 0 || y == MAX_Y - 1){
matrix[x][y]->label->show();
matrix[x][y]->type = BORDER_LABEL;//边界label
}
}
}
}
void Board::initSnake(){//画蛇身
int x0 = 5, y0 = 5;
int snakeLen = 5;//初始蛇身长5
dx = 1;
dy = 0;
snake.clear();
for(int x = x0; x < x0 + snakeLen; x++){
snake.append(matrix[x][y0]);
snake.at(snake.length() - 1)->x = x;
snake.at(snake.length() - 1)->y = y0;
matrix[x][y0]->type = SNAKE_LABEL;//蛇身label
matrix[x][y0]->label->show();
}
}
void Board::moveStep(){
getHeadTail();//获取蛇头和蛇尾指针
Node *n = matrix[head->x + dx][head->y + dy];
n->label->show();
//n是即将变成蛇头的那个label
if(n->type == BORDER_LABEL || n->type == SNAKE_LABEL){
qDebug() << "Game over@!!!";
timer.stop();
QMessageBox::information(this, "提示", "*** Game Over ***", QMessageBox::Ok);
}else{
if(n->type == FOOD_LABEL){//吃到食物了
n->type = SNAKE_LABEL;
snake.append(n);
//不移除尾巴
generateFood();//生成下一个食物
}else{
n->type = SNAKE_LABEL;
snake.append(n);
tail->label->hide();
tail->type = NORMAL_LABEL;
snake.removeFirst();
}
}
}
void Board::getHeadTail(){
head = snake.at(snake.length() - 1);//蛇头其实是list的尾巴
tail = snake.at(0);//蛇尾其实是list的第一个元素
// gameover();
}
void Board::slotMoveStep(){
// qDebug() << "movestep";
moveStep();
}
void Board::keyPressEvent(QKeyEvent *e){
//qDebug() << Qt::Key_up;
qDebug() << e->key();
switch (e->key()) {
case 16777235://上
if(up()){
dy = -1;
dx = 0;
}
break;
case 16777237://下
if(down()){
dy = 1;
dx = 0;
}
break;
case 16777234://左
if(left()){
dx = -1;
dy = 0;
}
break;
case 16777236://右
if(right()){
dx = 1;
dy = 0;
}
break;
default:
break;;
}
}
void Board::generateFood(){//生成食物
int food_x,food_y;
srand((unsigned)time(0));
do{
food_x = rand()%MAX_X;
food_y = rand()%MAX_Y;
}while(matrix[food_x][food_y]->type != NORMAL_LABEL);
// matrix[food_x][food_y]->label->setText("food");
matrix[food_x][food_y]->type = FOOD_LABEL;
matrix[food_x][food_y]->label->show();
}
bool Board::left(){
if(dy == 0){//向左或向右走
return false;
}
return true;
}
bool Board::right(){
if(dy == 0){//向左或向右走
return false;
}
return true;
}
bool Board::up(){
if(dx == 0){//向上或向下走
return false;
}
return true;
}
bool Board::down(){
if(dx == 0){//向上或向下走
return false;
}
return true;
}
本文出自 “阿凡达” 博客，请务必保留此出处http://shamrock.blog.51cto.com/2079212/1426968
原文：http://shamrock.blog.51cto.com/2079212/1426968