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Qt+C++ realizes the light strip animation movement position transformation and moves the marquee picture carousel

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foreword

This blog writes code for <<Qt+C++ Realizes Light Strip Animation Motion Position Change, Moving Marquee Picture Carousel>>, the code is neat, regular and easy to read. The first choice for learning and application recommendation.

Article directory

1. Required tool software

2. Use steps

1. Import library

2. Code implementation

3. Running results

3. Online assistance

1. Required tool software

1. VS, Qt

2. C++

2. Use steps

1. Import library

#include "MainWindow.h"

#include<iostream>
#include <QDebug>
#include <QFile>
#include <QTimer>
#include<QImage>
#include<QPixmap>
#include<QTransform>
#include<QPropertyAnimation>
#include<QGraphicsPixmapItem>
#include<QGraphicsScene>
#include <QtConcurrent/QtConcurrent>
#include <QPainter>

2. Code implementation

code show as below:

class MarqueeWidget : public QWidget {
public:
    MarqueeWidget(QWidget *parent = nullptr) : QWidget(parent) {
        setFixedSize(400, 100);
        
        label = new QLabel(this);
        label->setGeometry(0, 0, width(), height());
        
        timer = new QTimer(this);
        connect(timer, &QTimer::timeout, this, &MarqueeWidget::updateMarquee);
        
        marqueeText = "This is a marquee text.";
        marqueeIndex = 0;
        
        startMarquee();
    }
    
    void startMarquee() {
        if (!timer->isActive()) {
            timer->start(100); // 设置滚动速度，单位为毫秒
        }
    }
    
    void stopMarquee() {
        if (timer->isActive()) {
            timer->stop();
        }
    }
    
    void updateMarquee() {
        const int textLength = marqueeText.length();
        const int visibleLength = width() / fontMetrics().averageCharWidth();
        
        if (textLength <= visibleLength) {
            label->setText(marqueeText);
            return;
        }
        
        QString displayText = marqueeText.mid(marqueeIndex) + marqueeText.left(marqueeIndex);
        label->setText(displayText);
        
        marqueeIndex++;
        if (marqueeIndex >= textLength) {
            marqueeIndex = 0;
        }
    }
    
private:
    QLabel *label;
    QTimer *timer;
    QString marqueeText;
    int marqueeIndex;
};

3. Running results

3. Online assistance:

If you need to install the operating environment or remote debugging, see the personal QQ business card at the bottom of the article, and professional and technical personnel will assist remotely!
1) Remote installation and operation environment, code debugging
2) Qt, C++, Python entry guide
3) Interface beautification
4) Software production