QT实时视频播放界面设计

QT播放界面设计

今天写了个QT的实时视频播放界面，其实要写一个播放界面非常容易，以下为代码
首先定义一个用于播放的控件：
* PlsyItem.h

#ifndef PLAYITEM_H#define PLAYITEM_H#include <QObject>#include <QGraphicsItem>#include <QImage>class PlayItem : public QObject, public QGraphicsPixmapItem{    Q_OBJECTpublic:    explicit PlayItem(QObject *parent = nullptr);    PlayItem(const QImage &qimg);    ~PlayItem();    void setQImage(const QImage &qimg);};#endif // PLAYITEM_H

• PlsyItem.cpp

#include "PlayItem.h"PlayItem::PlayItem(QObject *parent) : QObject(parent){}PlayItem::PlayItem(const QImage &qimg){    this->setPixmap(QPixmap::fromImage(qimg));    this->update();}PlayItem::~PlayItem(){}void PlayItem::setQImage(const QImage &qimg){    this->setPixmap(QPixmap::fromImage(qimg));    this->update();}

然后定义一个 QGraphicsView，用于显示
* PlayWidget.h

#ifndef PLAYWIDGET_H#define PLAYWIDGET_H#include <QGraphicsView>#include <QGraphicsScene>#include <opencv2/core/core.hpp>#include "PlayItem.h"class PlayWidget : public QGraphicsView{    Q_OBJECTpublic:    PlayWidget();public slots:    void getResult(const QImage &qimg);private://    QImage Mat2QImage(const cv::Mat &img);    void updateScene();    // event    void wheelEvent(QWheelEvent *event);private:    PlayItem* m_play_item_ptr;    QGraphicsScene* m_img_scene_ptr;    cv::Mat m_img;    double m_zoom_factor;};#endif // PLAYWIDGET_H

• PlayWidget.cpp

#include "PlayWidget.h"#include <opencv2/imgproc/imgproc.hpp>#include <opencv2/highgui/highgui.hpp>#include <opencv2/core/core.hpp>#include <QWheelEvent>PlayWidget::PlayWidget(){    m_img_scene_ptr = new QGraphicsScene();    this->setScene(m_img_scene_ptr);    m_play_item_ptr = new PlayItem();    m_img_scene_ptr->addItem(m_play_item_ptr);    double width_scale = double(this->width()) / double(1280);    double height_scale = double(this->height()) / double(720);    m_zoom_factor = width_scale < height_scale ? width_scale : height_scale;    this->updateScene();}void PlayWidget::getResult(const QImage &qimg){    m_play_item_ptr->setQImage(qimg);}void PlayWidget::updateScene(){    QMatrix matrix;    matrix.scale(m_zoom_factor, m_zoom_factor);    this->setMatrix(matrix);}void PlayWidget::wheelEvent(QWheelEvent *event){    if(event->delta() > 0)        m_zoom_factor *= 1.15;    else        m_zoom_factor *= 0.9;    this->updateScene();}

然后将PlayWidget类作为主窗口或者某个窗体的控件即可，当PlayWidget收到QImage，便可以显示出来，而且可以缩放