最近老师让用Qt写一个可视化界面，然后就给了一个小视频，好奇的不得了，就照着做了一下
视频链接如下：C++案例教学–一个类游戏小程序的设计与实现全过程–用到QT-简单的STL容器

创建项目

1、打开QT
如果不知道怎么下载的话，可以参考这篇文章

2、在这里可以修改项目的名字和保存位置

3、之后就按照默认的，一直按[next]就可以了

代码如下

开始写代码了，具体操作老师在视频里全都说明了，这里只附上代码，希望对不想敲代码的朋友有帮助

以下这些代码都是自动生成后修改过的代码
ballobject.h

#ifndef BALLOBJECT_H
#define BALLOBJECT_H
#include 
#include //需要一些ball的共有属性和方法
class BaseBall
{
public:BaseBall();virtual ~BaseBall();int x, y;//位置int r;//半径virtual void LiveOneTimeSlice()=0;//存活在一个时间片里面virtual std::string GetClassName(){return "BaseBall";//获取对象所属的类的名字};
};class PassiveBall :public BaseBall
{
public:PassiveBall():BaseBall(){};void LiveOneTimeSlice() override;std::string GetClassName() override;
};class PlayerBall : public PassiveBall
{
public:PlayerBall():PassiveBall(){};std::string GetClassName() override;
};class RandomMoveBall :public BaseBall
{
public:RandomMoveBall():BaseBall(){};void LiveOneTimeSlice() override;std::string GetClassName() override;};
#endif // BALLOBJECT_H

mainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include 
#include 
#include "ballobject.h"QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private:Ui::MainWindow *ui;QTimer *timer;std::vector objList;//障碍物列表PlayerBall *playerball;//玩家来控制的小球void paintEvent(QPaintEvent *);void keyPressEvent(QKeyEvent *ev);void TimerEvent();
};
#endif // MAINWINDOW_H

ballobject.cpp

#include "ballobject.h"std::default_random_engine generator;
std::uniform_int_distribution distribution(0,100);
BaseBall::BaseBall()
{x = y = 0;r = 30;}BaseBall::~BaseBall()
{}void PassiveBall::LiveOneTimeSlice()
{}std::string PassiveBall::GetClassName()
{return "PassiveBall";
}std::string PlayerBall::GetClassName()
{return "PlayerBall";
}void RandomMoveBall::LiveOneTimeSlice()
{bool bLeft = distribution(generator)>49;x = bLeft ?x-20:x+20;bool bUp = distribution(generator)>49;y = bUp?y-10:y+10;
}std::string RandomMoveBall::GetClassName()
{return "RandomMoveBall";
}

mainWindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include 
#include 
#include "ballobject.h"
#include 
#include MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);//设定定时器Timer,每秒刷新30次，FPS=30，大概是三十毫秒timer = new QTimer(this);connect(timer, &QTimer::timeout, this, &MainWindow::TimerEvent);timer->start(50);//创建游戏对象1int objectsNum = 10;int H = this->height();int W = this->width();int xstep = (W - objectsNum*20)/(objectsNum-1);for(int i = 0;i < objectsNum;i++){PassiveBall* obj = new PassiveBall();//排放障碍物obj->x=i*(obj->r*2 + xstep)+obj->r;obj->y=H/2;obj->r=10;objList.push_back(obj);}//创建游戏对象2for(int i = 0;i < objectsNum;i++){RandomMoveBall* obj = new RandomMoveBall();//排放障碍物obj->x=i*(obj->r*2 + xstep)+obj->r;obj->y=H/2 - 20;obj->r=20;objList.push_back(obj);}//创建游戏对象3for(int i = 0;i < objectsNum;i++){RandomMoveBall* obj = new RandomMoveBall();//排放障碍物obj->x=i*(obj->r*2 + xstep)+obj->r;obj->y=H/2 - 20;obj->r=20;objList.push_back(obj);}//初始化玩家位置TODOplayerball = new PlayerBall();playerball->x = W/2;playerball->y = H;playerball->r=10;
}MainWindow::~MainWindow()
{delete ui;delete timer;//不删除就会内存泄露for(auto itm:objList){delete itm;}delete playerball;
}void MainWindow::paintEvent(QPaintEvent *)
{
//    static int x = 0;//    QPainter painter(this);
//    painter.setPen(Qt::red);
//    painter.setFont(QFont("楷体", 50));
//    painter.drawText(rect(), Qt::AlignCenter, "我爱你中国");//    painter.setPen(Qt::blue);
//    painter.setFont(QFont("楷体",500));
//    painter.drawEllipse(x,0,100,100);
//    x+=20;//给每一个游戏对象存活一个时间片for(auto itm:objList){itm->LiveOneTimeSlice();}//绘制整个游戏场景QPainter painter(this);painter.setPen(Qt::black);for(auto itm:objList){QBrush brush(QColor(0,200,250),Qt::Dense4Pattern);painter.setBrush(brush);painter.drawEllipse(itm->x-itm->r,itm->y-itm->r,itm->r*2,itm->r*2);}painter.setPen(Qt::darkBlue);QBrush brush(QColor(250,20,80),Qt::Dense4Pattern);painter.setBrush(brush);painter.drawEllipse(playerball->x-playerball->r,playerball->y-playerball->r,playerball->r*2,playerball->r*2);}void MainWindow::keyPressEvent(QKeyEvent *ev)
{if(ev->key()==Qt::Key_Up){playerball->y-=10;qDebug()<<"Press Key Up";return ;}if(ev->key()==Qt::Key_Down){playerball->y+=10;qDebug()<<"Press Key Down";return ;}if(ev->key()==Qt::Key_Left){playerball->x-=10;qDebug()<<"Press Key Left";return ;}if(ev->key()==Qt::Key_Right){playerball->x+=10;qDebug()<<"Press Key Right";return ;}
}void MainWindow::TimerEvent()
{//还要判断失败for(auto itm:objList){float distSqure = (itm->x - playerball->x)*(itm->x - playerball->x)+(itm->y - playerball->y)*(itm->y - playerball->y);if(distSqure<=((itm->r + playerball->r)*(itm->r + playerball->r))){qDebug() <<"Failed!";timer->stop();}}//判断成功if(playerball->y <= 0){qDebug() <<"Success!";timer->stop();}update();
}

效果如下

按动键盘上的上下左右键可以控制红色小球从下面往上跑，在不碰到蓝色小球的情况下安全到达最上方就挑战成功啦～

一点小问题

如果你下载的QTcreator版本在6以上，很有可能不能输入中文，虽然可以输出，如果是6以下的版本，可以采用一下方法修改配置，使其可以输入中文。

由Qt开发的软件界面不能输入中文
安装fcitx-libs-qt或fcitx-libs-qt5，在计算机中搜索libfcitxplatforminputcontextplugin.so文件，例如在我的计算机上，此文件位于

/usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libfcitxplatforminputcontextplugin.so

找到Qt的安装目录，将上述文件复制到安装目录下的plugins/platforminputcontexts子目录下。
重新运行程序即可。

QtCreator本身的编辑器不能输入中文
如果是QtCreator本身编辑器不能输入中文，则将上述文件拷贝至Qt安装目录的[Qt安装目录]/Tools/QtCreator/lib/Qt/plugins/platforminputcontexts或者[Qt安装目录]/Tools/QtCreator/bin/plugins/platforminputcontexts。
对于不同版本的Qt，插件路径可能略有不同，但一定是在[Qt安装目录]/Tools/QtCreator/中，可以自己搜索一下。拷贝完成后，重新启动QtCreator即可生效。

看了老师的视频就知道老师想要实现一个HuntPlayerBall去追踪玩家，但是由于时间的限制没能实现，那我这个垃圾实现了更简单的功能，希望老师看到了不要嫌弃。

代码如下

ballobject.h

#ifndef BALLOBJECT_H
#define BALLOBJECT_H
#include 
#include //需要一些ball的共有属性和方法
class BaseBall
{
public:BaseBall();virtual ~BaseBall();int x, y;//位置int r;//半径virtual void LiveOneTimeSlice()=0;//存活在一个时间片里面virtual std::string GetClassName(){return "BaseBall";//获取对象所属的类的名字};
};class PassiveBall :public BaseBall
{
public:PassiveBall():BaseBall(){};void LiveOneTimeSlice() override;std::string GetClassName() override;
};class PlayerBall : public PassiveBall
{
public:PlayerBall():PassiveBall(){};std::string GetClassName() override;
};class RandomMoveBall :public BaseBall
{
public:RandomMoveBall():BaseBall(){};void LiveOneTimeSlice() override;std::string GetClassName() override;};
class HuntPlayerBall :public BaseBall
{
public:HuntPlayerBall():BaseBall(){};void LiveOneTimeSlice() override;std::string GetClassName() override;};
#endif // BALLOBJECT_H

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include 
#include 
#include "ballobject.h"
#include 
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private:Ui::MainWindow *ui;QTimer *timer;std::vector objList1;//障碍物列表std::vector objList2;//障碍物列表std::vector objList3;//障碍物列表PlayerBall *playerball;//玩家来控制的小球void paintEvent(QPaintEvent *);void keyPressEvent(QKeyEvent *ev);void TimerEvent();};
#endif // MAINWINDOW_H

ballobject.cpp

#include "ballobject.h"std::default_random_engine generator;
std::uniform_int_distribution distribution(0,100);
BaseBall::BaseBall()
{x = y = 0;r = 30;}BaseBall::~BaseBall()
{}void PassiveBall::LiveOneTimeSlice()
{}std::string PassiveBall::GetClassName()
{return "PassiveBall";
}std::string PlayerBall::GetClassName()
{return "PlayerBall";
}void RandomMoveBall::LiveOneTimeSlice()
{bool bLeft = distribution(generator)>49;x = bLeft ?x-10:x+10;bool bUp = distribution(generator)>49;y = bUp?y-10:y+10;
}std::string RandomMoveBall::GetClassName()
{return "RandomMoveBall";
}void HuntPlayerBall::LiveOneTimeSlice()
{bool bLeft = distribution(generator)>49;x = bLeft ?x-20:x+20;bool bUp = distribution(generator)>49;y = bUp?y-10:y+10;
}std::string HuntPlayerBall::GetClassName()
{return "HuntPlayerBall";
}

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include 
#include 
#include "ballobject.h"
#include 
#include 
#include 
#include //添加随机数种子，作用：利用当前系统时间生成随机数，以此来防止每一次的随机数相同
#include  //添加头文件MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);//设定定时器Timer,每秒刷新30次，FPS=30，大概是三十毫秒timer = new QTimer(this);connect(timer, &QTimer::timeout, this, &MainWindow::TimerEvent);timer->start(50);
//    start = new QTimer(this);
//    connect(start, &QTimer::timeout, this, &MainWindow::StartEvent);//创建游戏对象1int objectsNum = 10;int H = this->height();int W = this->width();int xstep = (W - objectsNum*20)/(objectsNum-1);for(int i = 0;i < 30;i++){PassiveBall* obj = new PassiveBall();//排放障碍物int bLeft = QRandomGenerator::global()->bounded(100,1200);//qDebug()<x=bLeft;int bRight = QRandomGenerator::global()->bounded(100,1200);//qDebug()<y=bRight;obj->r=15;objList1.push_back(obj);}//创建游戏对象2for(int i = 0;i < objectsNum;i++){RandomMoveBall* obj = new RandomMoveBall();//排放障碍物obj->x=i*(obj->r*2 + xstep)+obj->r;obj->y=H/2 - 20;obj->r=20;objList2.push_back(obj);}//创建游戏对象3for(int i = 0;i < objectsNum;i++){HuntPlayerBall* obj = new HuntPlayerBall();//排放障碍物srandobj->x=i*(obj->r*2 + xstep)+obj->r;obj->y=H/2 - 20;obj->r=10;objList3.push_back(obj);}//初始化玩家位置TODOplayerball = new PlayerBall();playerball->x = W/2;playerball->y = H;playerball->r=10;
}MainWindow::~MainWindow()
{delete ui;delete timer;//不删除就会内存泄露for(auto itm:objList1){delete itm;}for(auto itm:objList2){delete itm;}for(auto itm:objList3){delete itm;}delete playerball;
}void MainWindow::paintEvent(QPaintEvent *)
{
//    static int x = 0;//    QPainter painter(this);
//    painter.setPen(Qt::red);
//    painter.setFont(QFont("楷体", 50));
//    painter.drawText(rect(), Qt::AlignCenter, "我爱你中国");//    painter.setPen(Qt::blue);
//    painter.setFont(QFont("楷体",500));
//    painter.drawEllipse(x,0,100,100);
//    x+=20;//给每一个游戏对象存活一个时间片for(auto itm:objList1){itm->LiveOneTimeSlice();}for(auto itm:objList2){itm->LiveOneTimeSlice();}for(auto itm:objList3){itm->LiveOneTimeSlice();}//绘制整个游戏场景QPainter painter(this);painter.setPen(Qt::black);for(auto itm:objList1){QBrush brush(QColor(0,200,0),Qt::Dense4Pattern);painter.setBrush(brush);painter.drawEllipse(itm->x-itm->r,itm->y-itm->r,itm->r*2,itm->r*2);}for(auto itm:objList2){QBrush brush(QColor(0,200,250),Qt::Dense4Pattern);painter.setBrush(brush);painter.drawEllipse(itm->x-itm->r,itm->y-itm->r,itm->r*2,itm->r*2);}for(auto itm:objList3){QBrush brush(QColor(250,20,20),Qt::Dense4Pattern);painter.setBrush(brush);painter.drawEllipse(itm->x-itm->r,itm->y-itm->r,itm->r*2,itm->r*2);}painter.setPen(Qt::darkBlue);QBrush brush(QColor(255,255,0),Qt::Dense4Pattern);painter.setBrush(brush);painter.drawEllipse(playerball->x-playerball->r,playerball->y-playerball->r,playerball->r*2,playerball->r*2);}void MainWindow::keyPressEvent(QKeyEvent *ev)
{if(ev->key()==Qt::Key_Up){playerball->y-=30;qDebug()<<"Press Key Up";return ;}if(ev->key()==Qt::Key_Down){playerball->y+=30;qDebug()<<"Press Key Down";return ;}if(ev->key()==Qt::Key_Left){playerball->x-=30;qDebug()<<"Press Key Left";return ;}if(ev->key()==Qt::Key_Right){playerball->x+=30;qDebug()<<"Press Key Right";return ;}
}void MainWindow::TimerEvent()
{//还要判断失败for(auto itm:objList1){float distSqure = (itm->x - playerball->x)*(itm->x - playerball->x)+(itm->y - playerball->y)*(itm->y - playerball->y);if(distSqure<=((itm->r + playerball->r)*(itm->r + playerball->r))){qDebug() <<"Failed!";timer->stop();}}for(auto itm:objList2){float distSqure = (itm->x - playerball->x)*(itm->x - playerball->x)+(itm->y - playerball->y)*(itm->y - playerball->y);if(distSqure<=((itm->r + playerball->r)*(itm->r + playerball->r))){qDebug() <<"Failed!";timer->stop();}}for(auto itm:objList3){float distSqure = (itm->x - playerball->x)*(itm->x - playerball->x)+(itm->y - playerball->y)*(itm->y - playerball->y);if(distSqure<=((itm->r + playerball->r)*(itm->r + playerball->r))){qDebug() <<"Failed!";timer->stop();}}for(auto itm:objList3){float distSqure = sqrt((itm->x - playerball->x)*(itm->x - playerball->x)+(itm->y - playerball->y)*(itm->y - playerball->y));if(distSqure<=(itm->r + playerball->r+200)){float x_dis=(playerball->x - itm->x)/distSqure;float y_dis=(playerball->y - itm->y)/distSqure;itm->x+=x_dis*10;itm->y+=y_dis*10;}}//判断成功if(playerball->y <= 0){qDebug() <<"Success!";timer->stop();}update();
}

效果如下

红色小球会追踪，顺便绿色小球每次编译刷新