QPainter QConicalGradient QPropertyAnimation 绘制雷达_qt qpropertyanimation颜色渐变

一、效果预览图

二、代码构造思路
QPainter绘制背景图、QConicalGradient 构造颜色渐变对象、利用QPropertyAnimation创建动画
三、代码片段

#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
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