Code

GroupWidget.cpp

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+#include "GroupWidget.h"
+
+GroupWidget::GroupWidget(QWidget *parent)
+    : QDialog(parent)
+{
+    //设置最小尺寸
+    setFixedSize(240,300);
+    //去掉问号
+    setWindowFlags(Qt::CustomizeWindowHint | Qt::WindowCloseButtonHint);
+    //设置对话框标题
+    setWindowTitle(QStringLiteral("加群联系作者"));
+    setStyleSheet("border-image:url(://Picture/Qt.png)");
+}
+
+GroupWidget::~GroupWidget()
+{}

GroupWidget.h

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+#ifndef GROUPWIDGET_H
+#define GROUPWIDGET_H
+
+#include <QDialog>
+
+class GroupWidget : public QDialog
+{
+    Q_OBJECT
+
+public:
+    GroupWidget(QWidget *parent = 0);
+    ~GroupWidget();
+};
+
+#endif

MainWidget.cpp

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+#include "MainWidget.h"
+
+Widget::Widget(QWidget *parent)
+    : QDialog(parent)
+{
+    //窗口基础设置
+    setFixedSize(300,350);
+    setWindowFlags(Qt::CustomizeWindowHint | Qt::WindowCloseButtonHint);
+    setStyleSheet("background-color:rgb(68,68,68);");
+
+    //初始化控件
+    QPushButton* btn_Test=new QPushButton();
+    QPushButton* btn_GetCode=new QPushButton();
+    QVBoxLayout* mainLayout=new QVBoxLayout();
+
+    //这只按钮文字
+    btn_Test->setText(QStringLiteral("测试"));
+    btn_GetCode->setText(QStringLiteral("获取源码"));
+
+    //设置按钮高度
+    btn_Test->setFixedHeight(30);
+    btn_GetCode->setFixedHeight(30);
+
+    //设置按钮样式表
+    btn_Test->setStyleSheet("border-radius:4px;background-color:rgb(230,230,230);");
+    btn_GetCode->setStyleSheet("border-radius:4px;background-color:rgb(230,230,230);");
+
+    //环形进度条初始化
+    round_Bar=new QRoundProgressBar();
+
+    //环形进度条可选设置
+    do{
+        //round_Bar->SetStartAngle(-30);
+        //round_Bar->SetEndAngle(210);
+        //round_Bar->SetMaxRadius(100);
+        //round_Bar->SetRingWidth(20);
+        //round_Bar->SetIcomWidth(25);
+        //round_Bar->SetCircularBorderColor(qRgb(255,0,0));
+        //round_Bar->SetInsideMaskColor(qRgb(0,255,0));
+        //round_Bar->SetRadialGradient(qRgb(10,10,10),qRgb(120,0,120));
+        //SlotBtnTest();
+    }while(0);
+
+
+    //初始化并设置布局
+    QHBoxLayout* btnLayout=new QHBoxLayout();
+    btnLayout->setMargin(10);
+    btnLayout->setSpacing(10);
+    btnLayout->addWidget(btn_Test);
+    btnLayout->addWidget(btn_GetCode);
+
+    mainLayout->setMargin(20);
+    mainLayout->setSpacing(0);
+    mainLayout->addSpacing(20);
+    mainLayout->addWidget(round_Bar);
+    mainLayout->addLayout(btnLayout);
+    setLayout(mainLayout);
+
+    //添加信号与槽
+    connect(btn_Test,&QPushButton::clicked,this,&Widget::SlotBtnTest);
+    connect(btn_GetCode,&QPushButton::clicked,this,&Widget::SlotBtnGetCode);
+}
+
+Widget::~Widget()
+{
+}
+
+void Widget::SlotBtnTest()
+{
+    round_Bar->SetCurrPrograss(qrand()%100);
+}
+
+void Widget::SlotBtnGetCode()
+{
+    GroupWidget widget;
+    widget.exec();
+}

MainWidget.h

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+#ifndef WIDGET_H
+#define WIDGET_H
+
+#include <QDialog>
+#include <QPushButton>
+#include <QVBoxLayout>
+#include <QHBoxLayout>
+
+#include "GroupWidget.h"
+#include "QRoundProgressBar.h"
+
+class Widget : public QDialog
+{
+    Q_OBJECT
+
+    QRoundProgressBar* round_Bar;
+
+public:
+    Widget(QWidget *parent = nullptr);
+    ~Widget();
+
+    void SlotBtnTest();
+    void SlotBtnGetCode();
+};
+#endif // WIDGET_H

QRoundProgressBar.cpp

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+#include "QRoundProgressBar.h"
+
+QRoundProgressBar::QRoundProgressBar(QWidget *parent) :
+    QWidget(parent)
+{
+    //给变量设置初始值-默认值
+    startAngle=-45;
+    endAngle=225;
+    ringWidth=20;
+    maxRadius=110;
+    iconWidth=15;
+    currAngle=270;
+    circularBorderColor=qRgb(120,120,120);
+    insideMaskColor=qRgb(68,68,68);
+    startGradientColor=qRgb(80,80,80);
+    endGradientColor=qRgb(150,140,20);
+}
+
+void QRoundProgressBar::SetStartAngle(int value)
+{
+    startAngle=value;
+}
+
+void QRoundProgressBar::SetEndAngle(int value)
+{
+    endAngle=value;
+}
+
+void QRoundProgressBar::SetMaxRadius(int value)
+{
+    maxRadius=value;
+}
+
+void QRoundProgressBar::SetRingWidth(int value)
+{
+    ringWidth=value;
+}
+
+void QRoundProgressBar::SetIcomWidth(int value)
+{
+    iconWidth=value;
+}
+
+void QRoundProgressBar::SetCircularBorderColor(QRgb value)
+{
+    circularBorderColor=value;
+}
+
+void QRoundProgressBar::SetInsideMaskColor(QRgb value)
+{
+    insideMaskColor=value;
+}
+
+void QRoundProgressBar::SetRadialGradient(QRgb startColor,QRgb endColor)
+{
+    startGradientColor=startColor;
+    endGradientColor=endColor;
+}
+
+void QRoundProgressBar::SetCurrPrograss(int value)
+{
+    currAngle=value;
+    update();
+}
+
+void QRoundProgressBar::paintEvent(QPaintEvent*)
+{
+    //初始化变量
+    QPainter painter(this);
+    // 右移1位 相当于width()/2
+    painter.translate(width() >> 1, height() >> 1);
+    //启动反锯齿
+    painter.setRenderHint(QPainter::Antialiasing);
+
+    //绘制外圆
+    DrawOutSideCircle(painter);
+    //绘制两个小圆外圆
+    DrawTwoSmallCircle(painter,0);
+    //绘制圆环
+    DrawCircularRing(painter,0);
+    //绘制两个小圆内圆
+    DrawTwoSmallCircle(painter,1);
+    //绘制渐变色圆环
+    DrawGradientCircle(painter,maxRadius-1);
+    //绘制内圆
+    DrawInSideCircle(painter);
+    //绘制进度小圆
+    DrawBarIcon(painter);
+}
+
+void QRoundProgressBar::GradientArc(QPainter &painter,int radius,QRgb color)
+{
+    // 渐变色
+    QRadialGradient gradient(0, 0, radius);
+    gradient.setColorAt(0, color);
+    gradient.setColorAt(1.0, color);
+    painter.setBrush(gradient);
+
+    QRectF rect(-radius, -radius, radius << 1, radius << 1);
+    QPainterPath path;
+    path.arcTo(rect, startAngle, endAngle-startAngle);
+
+    painter.setPen(Qt::NoPen);
+    painter.drawPath(path);
+}
+
+void QRoundProgressBar::GradientFullArc(QPainter &painter,QPointF& point,int radius,QRgb color)
+{
+    // 渐变色
+    QRadialGradient gradient(0, 0, radius);
+    gradient.setColorAt(0, color);
+    gradient.setColorAt(1.0, color);
+    painter.setBrush(gradient);
+    painter.drawEllipse(point,radius,radius);
+}
+
+void QRoundProgressBar::DrawOutSideCircle(QPainter& painter)
+{
+    GradientArc(painter,maxRadius,circularBorderColor);
+}
+
+void QRoundProgressBar::DrawCircularRing(QPainter& painter,int)
+{
+    GradientArc(painter,maxRadius-1,startGradientColor);
+}
+
+void QRoundProgressBar::DrawTwoSmallCircle(QPainter& painter,int type)
+{
+    //计算小圆坐标
+    QPoint rightCircle(0,0);
+    QPoint leftCircle(0,0);
+    rightCircle.setY(-(qSin(startAngle*M_PI/180)*(maxRadius-ringWidth/2)));
+    rightCircle.setX(qCos(startAngle*M_PI/180)*(maxRadius-ringWidth/2)+1);
+    leftCircle.setX(-rightCircle.rx());
+    leftCircle.setY(rightCircle.ry());
+    if(type==0){
+        painter.drawEllipse(rightCircle,ringWidth/2,ringWidth/2);
+        painter.drawEllipse(leftCircle,ringWidth/2,ringWidth/2);
+    }
+    else{
+        painter.drawEllipse(rightCircle,ringWidth/2-1,ringWidth/2-1);
+        painter.drawEllipse(leftCircle,ringWidth/2-1,ringWidth/2-1);
+    }
+}
+
+void QRoundProgressBar::DrawInSideCircle(QPainter& painter)
+{
+    QPointF point(0,0);
+    GradientArc(painter,maxRadius-ringWidth+1,circularBorderColor);
+    GradientFullArc(painter,point,maxRadius-ringWidth,insideMaskColor);
+    //GradientFullArc(painter,maxRadius*3/4,qRgb(48,48,48));
+}
+
+void QRoundProgressBar::DrawGradientCircle(QPainter& painter,int radius)
+{
+    QConicalGradient conicalGradient(QPointF(0, 0), endAngle+1);
+    conicalGradient.setColorAt((360-qAbs(endAngle-startAngle)+currAngle)/360.0, endGradientColor);
+    conicalGradient.setColorAt(1, startGradientColor);
+    painter.setBrush(conicalGradient);
+    QPainterPath path;
+    QRectF rect(-radius, -radius, radius << 1, radius << 1);
+    path.arcTo(rect, startAngle+currAngle, endAngle-startAngle-currAngle);
+    painter.setPen(Qt::NoPen);
+    painter.drawPath(path);
+}
+
+void QRoundProgressBar::DrawBarIcon(QPainter& painter)
+{
+    QPointF point(0,0);
+    point.setX(point.x()+qCos((startAngle+currAngle)*M_PI/180)*(maxRadius-ringWidth/2));
+    point.setY(point.y()-qSin((startAngle+currAngle)*M_PI/180)*(maxRadius-ringWidth/2));
+    GradientFullArc(painter,point,iconWidth,endGradientColor);
+    GradientFullArc(painter,point,iconWidth*0.6,startGradientColor);
+}

QRoundProgressBar.h

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+#ifndef QROUNDPROGRESSBAR_H
+#define QROUNDPROGRESSBAR_H
+
+#include <QLabel>
+#include <QTimer>
+#include <QtMath>
+#include <QObject>
+#include <QPainter>
+#include <QWidget>
+#include <QPixmap>
+#include <QVBoxLayout>
+
+class QRoundProgressBar : public QWidget
+{
+    Q_OBJECT
+
+private:
+    int startAngle;              //起始角度
+    int endAngle;               //结束角度
+    int ringWidth;              //环宽度
+    int maxRadius;             //大圆半径
+    int iconWidth;              //图标的宽度
+    int currAngle;               //当前进度条对应的角度
+
+    QRgb circularBorderColor;
+    QRgb insideMaskColor;
+    QRgb startGradientColor;
+    QRgb endGradientColor;
+
+private:
+    void DrawBarIcon(QPainter&);
+    void GradientArc(QPainter&,int,QRgb);
+    void GradientFullArc(QPainter&,QPointF&,int,QRgb);
+    void DrawOutSideCircle(QPainter&);
+    void DrawCircularRing(QPainter&,int);
+    void DrawTwoSmallCircle(QPainter&,int);
+    void DrawInSideCircle(QPainter&);
+    void DrawGradientCircle(QPainter&,int);
+
+public:
+    explicit QRoundProgressBar(QWidget *parent = nullptr);
+
+protected:
+    void paintEvent(QPaintEvent *event);
+
+public:
+    //初始化调用函数
+    void SetStartAngle(int);            //设置起始角度值
+    void SetEndAngle(int);              //设置结束角度值
+    void SetMaxRadius(int);            //设置圆环外圆半径
+    void SetRingWidth(int);            //设置圆环宽度
+    void SetIcomWidth(int);           //设置进度图标大小
+    void SetCircularBorderColor(QRgb);      //设置圆环边框颜色
+    void SetInsideMaskColor(QRgb);            //设置内圆遮罩颜色
+    void SetRadialGradient(QRgb,QRgb);      //设置圆环渐变色
+
+    void SetCurrPrograss(int);      //设置当前进度条进度值
+
+};
+
+#endif