Qt小玩意儿——简单图片转字符构成的图像

港控/mmm° 2022-10-15 12:52 132阅读 0赞

效果如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0p1aWN5QWN0aXZlR2lsYmVydA_size_16_color_FFFFFF_t_70]  
头文件：

#ifndef IMAGETOTEXT_H
    #define IMAGETOTEXT_H
    
    #include <QWidget>
    #include <QPlainTextEdit>
    #include <QLabel>
    
    class ImageToText : public QWidget
    {
        
        Q_OBJECT
    public:
        explicit ImageToText(QWidget *parent = nullptr);
        ~ImageToText();
    
        void loadImage(const QString &path);
    protected slots:
        void onSliderValueChanged(int val);
    protected:
        void initialize();
        void showText();
    private:
        QPlainTextEdit *m_pPlainText = nullptr;
        QLabel *m_pLabel = nullptr;
        QImage m_img;
    
        int m_nVal = 125;
    };
    
    #endif // IMAGETOTEXT_H

源文件：

#include "imagetotext.h"
    #include <QHBoxLayout>
    #include <QVBoxLayout>
    #include <QImage>
    #include <QPixmap>
    #include <QSlider>
    #include <QDebug>
    
    ImageToText::ImageToText(QWidget *parent) : QWidget(parent)
    {
        
        initialize();
    }
    
    ImageToText::~ImageToText()
    {
        
    
    }
    
    void ImageToText::loadImage(const QString &path)
    {
        
        m_img = QImage(path);
        m_pLabel->setPixmap(QPixmap::fromImage(m_img));
        m_img = m_img.scaled(100,50);
        showText();
    }
    
    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);
        }
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0p1aWN5QWN0aXZlR2lsYmVydA_size_16_color_FFFFFF_t_70]: /images/20221014/0c0a3013de364c0b993cb912e0b0be04.png