Qt小玩意儿——简单图片转字符构成的图像（2）（GIF加载）

秒速五厘米 2022-10-15 12:54 155阅读 0赞

一般的图片加载见上篇博文：[Qt小玩意儿——简单图片转字符构成的图像][Qt]  
效果：  
![在这里插入图片描述][20210525113632325.gif]  
头文件：

#ifndef IMAGETOTEXT_H
    #define IMAGETOTEXT_H
    
    #include <QWidget>
    #include <QPlainTextEdit>
    #include <QLabel>
    #include <QTimerEvent>
    
    class ImageToText : public QWidget
    {
        
        Q_OBJECT
    public:
        explicit ImageToText(QWidget *parent = nullptr);
        ~ImageToText();
    
        void loadImage(const QString &path);
        void loadImages(const QStringList &paths);
    
        void loadGIF(const QString &path);
    protected slots:
        void onSliderValueChanged(int val);
    protected:
        void initialize();
        void showText();
        void createGIFCache();
        void clearGIFCache();
    
        void timerEvent(QTimerEvent *event);
    private:
        QPlainTextEdit *m_pPlainText = nullptr;
        QLabel *m_pLabel = nullptr;
        QImage m_img;
    
        QStringList m_lstPaths;
    
        int m_nVal = 125;
        int m_nTimerID = -1;
        int m_nIndex = -1;
    };
    
    #endif // IMAGETOTEXT_H

源文件：

#include "imagetotext.h"
    #include <QHBoxLayout>
    #include <QVBoxLayout>
    #include <QImage>
    #include <QPixmap>
    #include <QSlider>
    #include <QMovie>
    #include <QDir>
    #include <QDebug>
    
    #define CATCHE_DIR "D:\\cache"
    
    ImageToText::ImageToText(QWidget *parent) : QWidget(parent)
    {
        
        initialize();
    }
    
    ImageToText::~ImageToText()
    {
        
        if(m_nTimerID != -1){
        
            this->killTimer(m_nTimerID);
        }
        clearGIFCache();
    }
    
    void ImageToText::loadImage(const QString &path)
    {
        
        m_img = QImage(path);
        m_pLabel->setPixmap(QPixmap::fromImage(m_img));
        m_img = m_img.scaled(100,44);
        showText();
    }
    
    void ImageToText::loadImages(const QStringList &paths)
    {
        
        if(paths.isEmpty()){
        
            return;
        }
    
        if(m_nTimerID != -1){
        
            this->killTimer(m_nTimerID);
        }
        m_lstPaths = paths;
        m_nIndex = 0;
        this->startTimer(1000/20);
    
    }
    
    void ImageToText::loadGIF(const QString &path)
    {
        
        clearGIFCache();
        QMovie *pMovie = new QMovie(this);
    
        pMovie->setFileName(path);
    
        int nFrameCount = pMovie->frameCount();
        m_lstPaths.clear();
        for (int i = 0; i < nFrameCount; ++i) {
        
            pMovie->jumpToFrame(i);
            QImage img = pMovie->currentImage();
            QString imgPath = CATCHE_DIR + QString("/") + QString::number(i) + ".jpg";
            img.save(imgPath);
            m_lstPaths.append(imgPath);
        }
        loadImages(m_lstPaths);
    
    }
    
    void ImageToText::onSliderValueChanged(int val)
    {
        
        m_nVal = val;
    
        showText();
    }
    
    void ImageToText::initialize()
    {
        
        QHBoxLayout *pLayout = new QHBoxLayout;
        m_pPlainText = new QPlainTextEdit;
        m_pLabel = new QLabel;
        QSlider *pSliderColor = new QSlider(Qt::Horizontal);
        pSliderColor->setRange(0,255);
        pSliderColor->setValue(m_nVal);
    
        QVBoxLayout *pVLayout = new QVBoxLayout;
        pVLayout->addWidget(pSliderColor);
        pVLayout->addWidget(m_pLabel);
    
        pLayout->addLayout(pVLayout);
        pLayout->addWidget(m_pPlainText);
        this->setLayout(pLayout);
        this->resize(1500,750);
    
        connect(pSliderColor,SIGNAL(valueChanged(int)),this,SLOT(onSliderValueChanged(int)));
    }
    void ImageToText::showText()
    {
        
        m_pPlainText->clear();
        if(m_img.isNull()){
        
            return;
        }
    
        int w = m_img.width();
        int h = m_img.height();
        for(int i=0; i < h;i++)
        {
        
            QString text;
            for(int j= 0; j < w;j++)
            {
        
                QRgb pixel = m_img.pixel(j,i);
                int gray = qGray(pixel);
                if(gray > m_nVal){
        
                    text += ".";
                }else{
        
                    text += "*";
                }
            }
            text +"\n";
            m_pPlainText->appendPlainText(text);
        }
    }
    
    void ImageToText::createGIFCache()
    {
        
        QDir dir(CATCHE_DIR);
        if(!dir.exists()){
        
            qDebug() <<  dir.mkdir(CATCHE_DIR);
        }
    }
    
    void ImageToText::clearGIFCache()
    {
        
        QDir dir(CATCHE_DIR);
    
        if(!dir.exists()){
        
            createGIFCache();
            return;
        }
        qDebug() << dir.removeRecursively();
    
        createGIFCache();
    }
    
    void ImageToText::timerEvent(QTimerEvent *event)
    {
        
        QWidget::timerEvent(event);
        if(m_lstPaths.isEmpty()){
        
            return;
        }
        if(m_nIndex < 0 ||
                m_nIndex >= m_lstPaths.count()){
        
            m_nIndex = 0;
        }
    
        loadImage(m_lstPaths[m_nIndex]);
        m_nIndex++;
    }

[Qt]: https://blog.csdn.net/JuicyActiveGilbert/article/details/117251243?spm=1001.2014.3001.5501
[20210525113632325.gif]: /images/20221014/e0d130a19e1348608ca5aea3b2c7f9f9.png