Qt小玩意儿——代码雨

淩亂°似流年 2022-10-16 06:17 163阅读 0赞

效果：  
![在这里插入图片描述][2021052714171877.gif]  
头文件

#ifndef HACKRAIN_H
    #define HACKRAIN_H
    
    #include <QWidget>
    #include <QPlainTextEdit>
    #include <QTimerEvent>
    
    class HackRain : public QWidget
    {
        
        Q_OBJECT
    public:
        explicit HackRain(QWidget *parent = nullptr);
        ~HackRain();
    
        struct RainText
        {
        
            RainText() {
        }
    
            int startRow = 0;
            int endRow = 0;
            int col = 0;
            int speed = 1;  //下降的速度
    
            QString text;
    
            void init(){
        
                endRow = startRow + text.length() - 1;
            }
        };
    
    protected:
        void initialize();
    
        RainText getRainLine();
        void getCanAddCol(RainText &rText);
        void updateFrame();
    
        void timerEvent(QTimerEvent *event);
    private:
        QPlainTextEdit *m_pPlaineText = nullptr;
        QVector<RainText> m_vecAllRains;
    
        int m_nTimerID = -1;
    };
    
    #endif // HACKRAIN_H

源文件

#include "hackrain.h"
    #include <QVBoxLayout>
    #include <QtMath>
    
    HackRain::HackRain(QWidget *parent) : QWidget(parent)
    {
        
        initialize();
    }
    
    HackRain::~HackRain()
    {
        
        if(m_nTimerID != -1){
        
            this->killTimer(m_nTimerID);
        }
    }
    
    void HackRain::initialize()
    {
        
        QVBoxLayout *pLayout = new QVBoxLayout;
        m_pPlaineText = new QPlainTextEdit;
        pLayout->addWidget(m_pPlaineText);
        m_pPlaineText->setStyleSheet("QPlainTextEdit{"
                                     "background-color:black;"
                                     "color:green;"
                                     "}");
    
        this->setLayout(pLayout);
        this->resize(650,650);
        m_pPlaineText->setEnabled(false);
    
        for (int i = 0; i < 50; ++i) {
        
            m_vecAllRains.append(getRainLine());
        }
    
        m_nTimerID = this->startTimer(1000/24);
    
    }
    
    HackRain::RainText HackRain::getRainLine()
    {
        
        QStringList riansTexts;
        riansTexts << "Hello world" << "Yes My baby" << "void main()";
    
        RainText rText;
        rText.startRow = qrand() % 80;
        rText.text = riansTexts.at(qrand() % 3);
        rText.init();
        getCanAddCol(rText);
        return rText;
    }
    
    void HackRain::getCanAddCol(HackRain::RainText &rText)
    {
        
        rText.col = qrand() % 100;
        rText.speed = qrand() % 5 + 1;
        if(m_vecAllRains.count() == 0){
        
            return;
        }
        bool canAdd = true;
        for(HackRain::RainText t:m_vecAllRains){
        
            if(t.col == rText.col &&
                    t.startRow <= rText.endRow){
        
                canAdd = false;
                break;
            }
        }
        if(!canAdd){
        
            getCanAddCol(rText);
        }
    }
    
    void HackRain::updateFrame()
    {
        
        m_pPlaineText->clear();
        QString texts;
        if(m_vecAllRains.isEmpty()){
        
            return;
        }
    
        for (int r = 0; r < 40; ++r) {
        
            for (int c = 0; c < 100; ++c) {
        
                bool isDot = true;
                for(HackRain::RainText rText:m_vecAllRains){
        
                    if(rText.col == c &&
                            (rText.startRow <= r && rText.endRow >= r)){
        
                        texts.append(rText.text.at(r - rText.startRow));
                        isDot = false;
                        break;
                    }
                }
                if(isDot){
        
                    texts.append(".");
                }
            }
            texts += "\n";
        }
    
        int i = 0;
        for(HackRain::RainText rText:m_vecAllRains){
        
            rText.startRow += rText.speed;
            if(rText.startRow >= 100){
        
                rText.startRow = 0;
                rText.init();
                getCanAddCol(rText);
            }else{
        
                rText.init();
            }
            m_vecAllRains[i] = rText;
            ++i;
        }
    
        m_pPlaineText->appendPlainText(texts);
    }
    
    void HackRain::timerEvent(QTimerEvent *event)
    {
        
        QWidget::timerEvent(event);
        updateFrame();
    }

[2021052714171877.gif]: /images/20221014/b9e4928eaaa74f60972f5e58f74d3e5c.png