QRoundProgressBar.cpp

#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);
}