QT封装的弧形进度条组件
资源内容介绍
在可视化应用中，弧形进度条应用也比较广泛，本示例封装了一个可复用、个性化的弧形进度条组件。示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下 #include "progressarc.h"#include <QPainter>#include <QPropertyAnimation>struct ProgressArcPrivate{ double minValue = 0; double maxValue = 100; double value = 0; double startAngle = -90; double endAngle = 270; QColor arcColor = QColor(QLatin1String("#4da1ff")); QColor textColor = QColor(QLatin1String("#4da1ff")); QColor titleColor = QColor(80, 80, 80); QColor baseColor = QColor(179,179,179); QColor backgroundColor = Qt::transparent; bool percent = true; QString title; QPropertyAnimation *animation;};ProgressArc::ProgressArc(const QString &title, QWidget *parent) : QWidget(parent) , d(new ProgressArcPrivate){ setTitle(title); d->animation = new QPropertyAnimation(this, "value", this); setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); connect(this, &ProgressArc::valueChanged, this, &ProgressArc::onStartAnimation);}ProgressArc::~ProgressArc(){}void ProgressArc::setTitle(const QString &title){ d->title = title; update();}QString ProgressArc::title() const{ return d->title;}void ProgressArc::setPercent(const bool percent){ d->percent = percent; update();}bool ProgressArc::percent() const{ return d->percent;}void ProgressArc::setMin(const double min){ d->minValue = min; update();}double ProgressArc::min() const{ return d->minValue;}void ProgressArc::setmax(const double max){ d->maxValue = max; update();}double ProgressArc::max() const{ return d->maxValue;}void ProgressArc::setStartAngle(const double startAngle){ d->startAngle = startAngle; update();}double ProgressArc::startAngle() const{ return d->startAngle;}void ProgressArc::setEndAngle(const double endAngle){ d->endAngle = endAngle; update();}double ProgressArc::endAngle() const{ return d->endAngle;}void ProgressArc::setArcColor(const QColor &color){ d->arcColor = color; update();}QColor ProgressArc::arcColor() const{ return d->arcColor;}void ProgressArc::setTextColor(const QColor &color){ d->textColor = color; update();}QColor ProgressArc::textColor() const{ return d->textColor;}void ProgressArc::setTitleColor(const QColor &color){ d->titleColor = color; update();}QColor ProgressArc::titleColor() const{ return d->titleColor;}void ProgressArc::setBaseColor(const QColor &color){ d->baseColor = color; update();}QColor ProgressArc::baseColor() const{ return d->baseColor;}void ProgressArc::setBackgroundColor(const QColor &color){ d->backgroundColor = color; update();}QColor ProgressArc::backgroundColor() const{ return d->backgroundColor;}QSize ProgressArc::sizeHint() const{ return QSize(200, 200);}QSize ProgressArc::minimumSizeHint() const{ return QSize(80, 80);}void ProgressArc::paintEvent(QPaintEvent *event){ QWidget::paintEvent(event); QPainter painter(this); painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing); // 背景 if (d->backgroundColor != Qt::transparent) { painter.setPen(Qt::NoPen); painter.fillRect(rect(), d->backgroundColor); } // 平移中心 painter.translate(width() / 2, height() / 2); // 圆弧 drawArc(&painter); // text drawText(&painter);}void ProgressArc::onStartAnimation(const double value){ if(value < d->minValue || value > d->maxValue || value == d->value) return; int start = d->value; int end = value; d->animation->setStartValue(start); d->animation->setEndValue(end); d->animation->start();}double ProgressArc::value() const{ return d->value;}void ProgressArc::setValue(const double value){ d->value = value; update();}void ProgressArc::drawArc(QPainter *painter){ double min = qMin(width(), height()); double arcWidth = min / 10.0; double radius = min / 2.0 - arcWidth - 5; QRectF rect = QRectF(-radius, -radius, radius * 2, radius * 2); QPen pen; pen.setWidthF(arcWidth); pen.setCapStyle(Qt::RoundCap); // 圆弧背景 double angle = d->endAngle - d->startAngle; pen.setColor(d->baseColor); painter->setPen(pen); painter->drawArc(rect, d->startAngle * 16, angle * 16); // 圆弧进度 double spanAngle = angle * ((d->value - d->minValue) / (d->maxValue - d->minValue)); double startAngle = d->endAngle - spanAngle; pen.setColor(d->arcColor); painter->setPen(pen); painter->drawArc(rect, startAngle * 16, spanAngle * 16);}void ProgressArc::drawText(QPainter *painter){ double min = qMin(width(), height()); double arcWidth = min / 10.0; double radius = min / 2.0 - arcWidth - 5; painter->setPen(d->textColor); QFont font("Microsoft YaHei", radius / 4.0); painter->setFont(font); QString strValue; if (d->percent) { double temp = d->value / (d->maxValue - d->minValue) * 100; strValue = QString("%1%").arg(temp, 0, 'f', 2); } else strValue = QString("%1").arg(d->value, 0, 'f', 2); // value QRectF valueRect(-radius, 0, radius * 2, radius / 3); painter->drawText(valueRect, Qt::AlignCenter, strValue); painter->setPen(d->titleColor); font.setPixelSize(radius / 4.0); painter->setFont(font); // title QRectF textRect(-radius, -radius / 2.5, radius * 2, radius / 3); painter->drawText(textRect, Qt::AlignCenter, d->title);}