本文小编为大家详细介绍“Qt如何编写自定义控件实现抽奖转盘”，内容详细，步骤清晰，细节处理妥当，希望这篇“Qt如何编写自定义控件实现抽奖转盘”文章能帮助大家解决疑惑，下面跟着小编的思路慢慢深入，一起来学习新知识吧。
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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