Qt如何编写自定义控件实现抽奖转盘

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具体代码如下

#ifndef LOTTERYTURNTABLEWIDGET_H#define LOTTERYTURNTABLEWIDGET_H #include <QWidget> class LotteryTurntableWidget : public QWidget{    Q_OBJECT    Q_PROPERTY(int rotate READ getRotate WRITE setRotate MEMBER painterRotate)public:    LotteryTurntableWidget(QWidget *parent = nullptr);    ~LotteryTurntableWidget()override;    int getRotate();    void setRotate(int rotate); protected:    void paintEvent(QPaintEvent *event)override;    void mousePressEvent(QMouseEvent *event)override;    void mouseReleaseEvent(QMouseEvent *event)override; private:    QRect centerBtnRect;    bool isPressCenterBtn{false};    bool isRuning{false};    int painterRotate{0};    void onRotateFinished();    QList<Qt::GlobalColor> colorList;};#endif // LOTTERYTURNTABLEWIDGET_H

#include "lotteryturntablewidget.h"#include <QPainter>#include <QPaintEvent>#include <QPainterPath>#include <QTime>#include <QDebug>#include <QRandomGenerator>#include <QPropertyAnimation> LotteryTurntableWidget::LotteryTurntableWidget(QWidget *parent)    : QWidget(parent){    setPalette(Qt::white);    setMinimumSize(500,500);     colorList << Qt::red << Qt::yellow << Qt::green << Qt::cyan << Qt::blue << Qt::magenta << Qt::darkGreen << Qt::darkCyan;} LotteryTurntableWidget::~LotteryTurntableWidget(){} int LotteryTurntableWidget::getRotate(){    return painterRotate;} void LotteryTurntableWidget::setRotate(int rotate){    painterRotate = rotate;    update();} void LotteryTurntableWidget::paintEvent(QPaintEvent *event){    QPainter painter(this);    painter.setRenderHint(QPainter::Antialiasing,true);  //反走样开启    const auto rect = event->rect();    auto radius = std::min(rect.width(),rect.height()) / 2 - 25;     painter.save();    painter.translate(rect.center()); //将坐标系的原点设置为(r,r)     QPen pen;    pen.setColor(QColor("#F0630B"));    pen.setWidth(16);    painter.setPen(pen);    painter.drawEllipse(QPoint(0, 0), radius, radius);     pen.setColor(QColor("#FF4500"));    pen.setWidth(8);    painter.setPen(pen);    radius -= 8;    painter.drawEllipse(QPoint(0, 0), radius, radius);     pen.setColor(QColor("#B71606"));    pen.setWidth(40);    painter.setPen(pen);    radius -= 24;    painter.drawEllipse(QPoint(0, 0), radius, radius);     painter.save();    if(!isRuning)    {        painter.setPen(Qt::white);        painter.setBrush(Qt::white);    }    for (int i = 0; i < 20; ++i)    {        painter.rotate(18.0);        int smallEllipse;        if(i % 2 == 0)        {            if(isRuning)            {                if(painterRotate % 2 == 0)                {                    painter.setPen(Qt::red);                    painter.setBrush(Qt::red);                }                else                {                    painter.setPen(Qt::blue);                    painter.setBrush(Qt::blue);                }            }            smallEllipse = 15;        }        else        {            if(isRuning)            {                if(painterRotate % 2 == 0)                {                    painter.setPen(Qt::blue);                    painter.setBrush(Qt::blue);                }                else                {                    painter.setPen(Qt::red);                    painter.setBrush(Qt::red);                }            }            smallEllipse = 10;        }        painter.drawEllipse(QPoint(radius, 0), smallEllipse, smallEllipse);    }    painter.restore();     pen.setColor(QColor("#FFC228"));    pen.setWidth(20);    painter.setPen(pen);    radius -= 30;    painter.drawEllipse(QPoint(0, 0), radius, radius);     radius -= 10;    auto centerRect = QRect(-radius,-radius,radius * 2,radius * 2);     painter.setPen(Qt::transparent);    painter.save();    painter.rotate(18.0 * painterRotate);    for (int i = 0;i < 8;++i)    {        QPainterPath path;        path.moveTo(0,0);        path.arcTo(centerRect, 45 * i,45);        path.closeSubpath();        painter.fillPath(path,colorList[i]);    }        painter.restore();     QPainterPath trianglePath;//三角形    QPolyGon polygon;    polygon.append(QPoint(0,-radius * 0.55));    polygon.append(QPoint(-radius * 0.25,0));    polygon.append(QPoint(radius * 0.25,0));    trianglePath.addPolygon(polygon);    painter.setBrush(QColor("#EEDAA2"));    painter.drawPath(trianglePath);     painter.setBrush(QColor("#FDFAEA"));    radius = static_cast<int>(radius * 0.3);    painter.drawEllipse(QPoint(0, 0), radius, radius);     painter.setBrush(isPressCenterBtn ? QColor("#B91A0D").lighter() : QColor("#B91A0D"));//中间的按钮    radius -= 2;    painter.drawEllipse(QPoint(0, 0), radius, radius);     centerBtnRect = QRect(rect.width() / 2 - radius,rect.height() / 2 - radius,radius * 2,radius * 2);    painter.restore();} void LotteryTurntableWidget::mousePressEvent(QMouseEvent *event){    if(isRuning)    {        QWidget::mousePressEvent(event);        return;    }    QRegion ellipseRegion(centerBtnRect, QRegion::Ellipse);    isPressCenterBtn = ellipseRegion.contains(event->pos());    if(isPressCenterBtn)    {        isRuning = true;         QPropertyAnimation *animation = new QPropertyAnimation(this, "rotate");        animation->setEasinGCurve(QEasingCurve::InOutCubic);        animation->setDuration(3000);        animation->setStartValue(0);        animation->setEndValue(QRandomGenerator::global()->bounded(360) + 360 * 5);        connect(animation, &QAbstractAnimation::finished, this, &LotteryTurntableWidget::onRotateFinished);        animation->start(QAbstractAnimation::DeleteWhenStopped);        update();    }    QWidget::mousePressEvent(event);} void LotteryTurntableWidget::mouseReleaseEvent(QMouseEvent *event){    if(isPressCenterBtn)    {        isPressCenterBtn = false;        update();    }    QWidget::mouseReleaseEvent(event);} void LotteryTurntableWidget::onRotateFinished(){    isRuning = false;}

效果：

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