QPainter QConicalGradient QPropertyAnimation drawn radar basic drawing (b)

First, the effect preview

two, the code idea
QPainter drawing background, QConicalGradient color gradient configuration objects, animation created using QPropertyAnimation
III snippet

#include "radarcycle.h"

RadarCycle::RadarCycle(QWidget *parent):
    QWidget (parent)
{
    resize(parent->size());
    show();
    init();
}
int RadarCycle::getRotate()
{
    return m_rotation;
}

void RadarCycle::setRotate(int rotate)
{
    m_rotation = rotate;
    update();
}
void RadarCycle::init()
{
    m_rotation = 0;
    QPropertyAnimation *animation = new QPropertyAnimation(this, "rotate");
    animation->setEasingCurve(QEasingCurve::Linear);
    animation->setDuration(18000);
    animation->setStartValue(0);
    animation->setEndValue(360);
    animation->setLoopCount(-1);
    animation->start(QAbstractAnimation::DeleteWhenStopped);
}

void RadarCycle::paintEvent(QPaintEvent *event)
{
    paintCycle(event,46,1);
    paintCycle(event,46*2,1);
    paintCycle(event,46*3,1);
    paintCycle(event,46*4,1);
    paintCycle(event,46*5,4);
    paintTextScale(event);
    paintLine(event);
    paintPie(event);
}

void RadarCycle::paintCycle(QPaintEvent *event,int r,int w)
{
    QRect rect = event->rect();
    if(rect.width()>rect.height())
        rect = QRect(rect.x(),rect.y(),rect.height(),rect.height());
    else {
        rect = QRect(rect.x(),rect.y(),rect.width(),rect.width());
    }
    QPainter painter(this);
    painter.save();
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setPen(QPen(QBrush("#008B8B"),w));
    painter.drawEllipse(QPoint(rect.width()/2,rect.height()/2),r,r);
    painter.restore();
}

void RadarCycle::paintTextScale(QPaintEvent *event)
{
    QRect rect = event->rect();
    if(rect.width()>rect.height())
        rect = QRect(rect.x(),rect.y(),rect.height(),rect.height());
    else {
        rect = QRect(rect.x(),rect.y(),rect.width(),rect.width());
    }
    QPainter painter(this);
    painter.translate(rect.width()/2,rect.height()/2);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setPen(QPen(QBrush("#008B8B"),2));

    for (int i=0; i<36; ++i)
    {
        QString txt = i < 10 ? "0" + QString::number(i) + "0" : QString::number(i)+"0";
        painter.drawText(-8, -rect.height()/2+40, txt);
        painter.drawLine(0,198,0,213);
        painter.rotate(10);
    }
}

void RadarCycle::paintLine(QPaintEvent *event)
{
    QRect rect = event->rect();
    if(rect.width()>rect.height())
        rect = QRect(rect.x(),rect.y(),rect.height(),rect.height());
    else {
        rect = QRect(rect.x(),rect.y(),rect.width(),rect.width());
    }
    QPainter painter(this);
    painter.translate(rect.width()/2,rect.height()/2);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setPen(QPen(QBrush("#008B8B"),2));

    for (int i=0; i<360; ++i)
    {
        painter.drawLine(207,0,213,0);
        painter.rotate(1);
    }

    for (int i=0; i<4; ++i)
    {
        painter.drawLine(0,173,0,213);
        painter.rotate(90);
    }

    for (int i=0; i<4; ++i)
    {
        painter.drawLine(0,173,0,213);
        painter.rotate(90);
    }

    for (int i=0; i<72; ++i)
    {
        painter.drawLine(0,202,0,213);
        painter.rotate(5);
    }
}

void RadarCycle::paintPie(QPaintEvent *event)
{
    QRect rect = event->rect();
    if(rect.width()>rect.height())
        rect = QRect(rect.x(),rect.y(),rect.height(),rect.height());
    else {
        rect = QRect(rect.x(),rect.y(),rect.width(),rect.width());
    }
    QRect rectColor = rect;
    int dx = 63;
    rect = rect.adjusted(dx,dx,-dx,-dx);
    QPainter painter(this);
    QConicalGradient gradient(rectColor.width() / 2, rectColor.height() / 2, m_rotation+180);
    gradient.setColorAt(0.1, QColor(15, 45, 188, 200));
    gradient.setColorAt(1, QColor(15, 45, 188, 0));
    painter.setBrush(gradient);
    painter.setPen(QPen(Qt::NoPen));
    int startAngle = m_rotation * 16;
    int spanAngle = 90 * 16;
    painter.drawPie(rect, startAngle, spanAngle);
}
#ifndef RADARCYCLE_H
#define RADARCYCLE_H

#include <QObject>
#include <QWidget>
#include <QPainter>
#include <QPaintEvent>
#include <QTimer>
#include <QPropertyAnimation>
class RadarCycle : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(int rotate READ getRotate WRITE setRotate)
public:
    RadarCycle(QWidget* parent = nullptr);
    void init();
    void paintCycle(QPaintEvent *event, int r1, int w);
    void paintTextScale(QPaintEvent *event);
    void paintLine(QPaintEvent *event);
    void paintPie(QPaintEvent *event);
    int getRotate();
    void setRotate(int rotate);
protected:
    void paintEvent(QPaintEvent *event) override;
private:
    int m_rotation;
};
#endif // RADARCYCLE_H

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