QT version of Snake game project

1.  Create project

Select template

Choose compiler ：

Prepare game material

Prepare the material

Add data members

enum Direct{Left,Right,Up,Down};
 
 QList<QRectF> snake;// Greedy snake body 
 
 int snakeNodeWidth = 20;
 int snakeNodeHeight = 20;
 QTimer *timer;
 
 int time = 150;
 int moveFlage = Up;
 bool gameStart = false;
 
 QRectF rewardNode;

Add declaration for method

protected:
 void paintEvent(QPaintEvent *);
 void keyPressEvent(QKeyEvent *);
 
 void addTop();
 void addDown();
 void addLeft();
 void addRight();
 
 void deleteLast();
 bool checkContact();
 void addNewReward();
 Add slot function 
protected slots:
 void timeOut();
 Constructors 
#include <QTimer>
 
Widget::Widget(QWidget *parent)
 : QWidget(parent)
 , ui(new Ui::Widget)
{
 ui->setupUi(this);
 
 resize(600, 368);
 
 snake.append(QRectF(300,180,snakeNodeWidth,snakeNodeHeight));
 addTop();
 addTop();
 
 timer = new QTimer;
connect(timer, SIGNAL(timeout()),this,SLOT(timeOut()));
 
 addNewReward();
}
 Key time processing 
#include <QKeyEvent>
 
void Widget::keyPressEvent(QKeyEvent *event)
{
 switch(event->key()){
 case Qt::Key_Up:
 if(moveFlage != Down){
 moveFlage = Up;
 }
 break;
 case Qt::Key_Down:
 if(moveFlage != Up){
 moveFlage = Down;
 }
 break;
 case Qt::Key_Right:
 if(moveFlage != Left){
 moveFlage = Right;
 }
 break;
 case Qt::Key_Left:
 if(moveFlage != Right){
 moveFlage = Left;
 }
 break;
 case Qt::Key_Space:
 if(!gameStart){
 timer->start(time);
 gameStart = true;
 }else {
 timer->stop();
 gameStart = false;
 }
 break;
 default:
 break;
 }
}

Timeout event handling

void Widget::timeOut()
{
 int count = 1;
 
 if (snake.at(0).intersects(rewardNode)) {
 addNewReward();
 count++;
 }
 
 while (count--) {
 switch (moveFlage) {
 case Up:
 addTop();
 break;
 case Down:
 addDown();
 break;
 case Right:
 addRight();
 break;
 case Left:
 addLeft();
 break;
 default:
 break;
 }
 }
 
 deleteLast();
 update();
}

Add a new box

void Widget::addNewReward() {
 rewardNode = QRectF(
 qrand()%(this->width()/20)*20,
 qrand()%(this->height()/20)*20,
 snakeNodeWidth,
 snakeNodeWidth);
}

Movement in all directions

// Move up 
void Widget::addTop()
{
 QPointF leftTop;
 QPointF rightBotom;
 if(snake.at(0).y()-snakeNodeHeight < 0){
 leftTop = QPointF(
 snake.at(0).x(), // top left corner x coordinate 
 this->height()-snakeNodeHeight); // top left corner y coordinate 
 rightBotom = QPointF(
 snake.at(0).x()+snakeNodeWidth,
 this->height());
 }else{
 leftTop = QPointF(snake.at(0).x(),
 snake.at(0).y() - snakeNodeHeight);
 rightBotom = snake.at(0).topRight();
 }
 
 snake.insert(0, QRectF(leftTop, rightBotom));
}
 
// Move down the 
void Widget::addDown()
{
 QPointF leftTop;
 QPointF rightBotom;
 
 if(snake.at(0).y()+snakeNodeHeight*2 > this->height()){
 leftTop = QPointF(snake.at(0).x(), 0);
 rightBotom = QPointF(snake.at(0).x()+snakeNodeWidth, snakeNodeHeight);
 }else{
 leftTop = snake.at(0).bottomLeft();
 rightBotom = snake.at(0).bottomRight() + QPointF(0, snakeNodeHeight);
 }
 
 snake.insert(0, QRectF(leftTop, rightBotom));
}
// Move to the left 
void Widget::addLeft()
{
 QPointF leftTop;
 QPointF rightBotom;
 
 if(snake.at(0).x()-snakeNodeWidth < 0){
 leftTop = QPointF(this->width() -snakeNodeWidth, snake[0].y());
 }else{
 leftTop = snake[0].topLeft() - QPointF(snakeNodeWidth, 0);
 }
 
 rightBotom = leftTop + QPointF(snakeNodeWidth, snakeNodeHeight);
 snake.insert(0, QRectF(leftTop, rightBotom));
}
// To the right 
void Widget::addRight()
{
 QPointF leftTop;
 QPointF rightBotom;
 
 if(snake.at(0).x()+snakeNodeWidth*2 > this->width()){
 leftTop = QPointF(0, snake[0].y());
 }else{
 leftTop = snake[0].topRight();
 }
 
 rightBotom = leftTop + QPointF(snakeNodeWidth, snakeNodeHeight);
 snake.insert(0, QRectF(leftTop, rightBotom));

Draw a greedy snake

#include <QPainter>
#include <QPen>
#include <QBrush>
 
void Widget::paintEvent(QPaintEvent *event)
{
 QPainter painter(this);
 QPen pen; // paint brush , Used to draw the outline 
 QBrush brush; // A brush , For filling 
 
 QPixmap pix;
 pix.load("D:/tmp/snake.jpg");
 painter.drawPixmap(0,0, 600, 368,pix);
 
 // Anti aliasing 
 painter.setRenderHint(QPainter::Antialiasing);
 
 pen.setColor(Qt::black);
 brush.setColor(Qt::darkMagenta);

 
 for(int i=0; i<snake.length(); i++){
 painter.drawRect(snake.at(i));
 }
 
 brush.setColor(Qt::red);
 painter.setBrush(brush);
 painter.drawEllipse(rewardNode);

 pen.setColor(Qt::black);
 painter.setPen(pen);
 QFont font(" Microsoft YaHei ", 12,QFont::ExtraLight,false);
 painter.setFont(font);
 painter.drawText(560, 32, QString("%1").arg(snake.length()));
 
 if(checkContact()){
 QFont font(" Fangzheng shutI ",30,QFont::ExtraLight,false);

 }
 
 QWidget::paintEvent(event);
}

Failure detection

// Judge whether the head of the snake collides with the body of the snake ,  And the body of the snake collides with the body of the snake 
bool Widget::checkContact()
{
 for(int i=0; i<snake.length();i++) {
 for(int j=i+1; j<snake.length(); j++){
 if(snake.at(i) == snake.at(j)){
 return true;
 }
 }
 }
 
 return false;
}

The end effect of the game

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