QT入门教程攻略 QT入门游戏设计：贪吃蛇实现 QT全攻略心得总结

// main.cpp

#include <QApplication> 

#include "mainwindow.h" 

int main(int argc, char *argv[]) {

QApplication a(argc, argv);

MainWindow w;

w.show();

return a.exec();

}

// mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow> 

#include <QTimer> 

#include <QKeyEvent> 

#include <QImage> 

#include <QVector> 

#include <QLabel> 

#include <QVBoxLayout> 

QT_BEGIN_NAMESPACE

namespace Ui { class MainWindow; }

QT_END_NAMESPACE

class MainWindow : public QMainWindow {

Q_OBJECT

public:

MainWindow(QWidget *parent = nullptr);

~MainWindow();

protected:

void keyPressEvent(QKeyEvent *event) override;

private slots:

void updateGame();

private:

Ui::MainWindow *ui;

QTimer *timer;

QVector<QPoint> snake;

QPoint food;

QImage gameBoard;

QLabel *gameWindow;

enum Direction { Stop = 0, Left, Right, Up, Down };

Direction dir;

void initGame();

void drawGameBoard();

void moveSnake();

bool checkCollision();

void resetGame();

};

#endif // MAINWINDOW_H

// mainwindow.cpp

#include "mainwindow.h" 

#include "ui_mainwindow.h" 

#include <QRandomGenerator> 

#include <QMessageBox> 

MainWindow::MainWindow(QWidget *parent)

: QMainWindow(parent)

, ui(new Ui::MainWindow)

, timer(new QTimer(this))

, dir(Stop) {

ui->setupUi(this);

gameWindow = new QLabel(this);

QVBoxLayout *layout = new QVBoxLayout;

layout->addWidget(gameWindow);

QWidget *centralWidget = new QWidget(this);

centralWidget->setLayout(layout);

setCentralWidget(centralWidget);

initGame();

connect(timer, &QTimer::timeout, this, &MainWindow::updateGame);

timer->start(100);

}

MainWindow::~MainWindow() {

delete ui;

}

void MainWindow::initGame() {

snake.clear();

snake.append(QPoint(100, 100));

dir = Stop;

int x = QRandomGenerator::global()->bounded(10, 390);

int y = QRandomGenerator::global()->bounded(10, 390);

while (snake.contains(QPoint(x, y))) {

x = QRandomGenerator::global()->bounded(10, 390);

y = QRandomGenerator::global()->bounded(10, 390);

}

food = QPoint(x, y);

gameBoard = QImage(400, 400, QImage::Format_RGB32);

gameBoard.fill(Qt::black);

drawGameBoard();

}

void MainWindow::drawGameBoard() {

QPainter painter(&gameBoard);

painter.setRenderHint(QPainter::Antialiasing);

painter.setPen(Qt::green);

for (int i = 0; i < snake.size(); ++i) {

painter.drawRect(snake[i].x(), snake[i].y(), 20, 20);

}

painter.setPen(Qt::red);

painter.drawRect(food.x(), food.y(), 20, 20);

gameWindow->setPixmap(QPixmap::fromImage(gameBoard));

}

void MainWindow::moveSnake() {

QPoint head = snake.first();

QPoint newHead;

switch (dir) {

case Left:

newHead = QPoint(head.x() - 20, head.y());

break;

case Right:

newHead = QPoint(head.x() + 20, head.y());

break;

case Up:

newHead = QPoint(head.x(), head.y() - 20);

break;

case Down:

newHead = QPoint(head.x(), head.y() + 20);

break;

default:

break;

}

if (newHead == food) {

snake.insert(0, newHead);

int x = QRandomGenerator::global()->bounded(10, 390 - 20);

int y = QRandomGenerator::global()->bounded(10, 390 - 20);

while (snake.contains(QPoint(x, y))) {

x = QRandomGenerator::global()->bounded(10, 390 - 20);

y = QRandomGenerator::global()->bounded(10, 390 - 20);

}

food = QPoint(x, y);

} else {

snake.pop_back();

snake.insert(0, newHead);

}

}

bool MainWindow::checkCollision() {

QPoint head = snake.first();

// Check for wall collision

if (head.x() < 0 || head.x() >= 400 || head.y() < 0 || head.y() >= 400)

return true;

// Check for self collision

for (int i = 1; i < snake.size(); ++i) {

if (snake[i] == head)

return true;

}

return false;

}

void MainWindow::resetGame() {

initGame();

}

void MainWindow::updateGame() {

if (dir != Stop) {

moveSnake();

}

if (checkCollision()) {

timer->stop();

QMessageBox::information(this, "Game Over", "You lost!");

resetGame();

}

drawGameBoard();

}

void MainWindow::keyPressEvent(QKeyEvent *event) {

if (event->key() == Qt::Key_Left && dir != Right)

dir = Left;

else if (event->key() == Qt::Key_Right && dir != Left)

dir = Right;

else if (event->key() == Qt::Key_Up && dir != Down)

dir = Up;

else if (event->key() == Qt::Key_Down && dir != Up)

dir = Down;

else if (event->key() == Qt::Key_Escape)

close();

else if (event->key() == Qt::Key_P) {

timer->stop();

} else if (event->key() == Qt::Key_R) {

resetGame();

timer->start();

}

}