widget.cpp Example File

nesteddonuts/widget.cpp
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#include "widget.h" #include <QtCharts/QChartView> #include <QtCharts/QChart> #include <QtCharts/QLegend> #include <QtCharts/QPieSeries> #include <QtCharts/QPieSlice> #include <QtCore/QRandomGenerator> #include <QtWidgets/QGridLayout> #include <QtCore/QTimer> QT_CHARTS_USE_NAMESPACE Widget::Widget(QWidget *parent) : QWidget(parent) { setMinimumSize(800, 600); QChartView *chartView = new QChartView; chartView->setRenderHint(QPainter::Antialiasing); QChart *chart = chartView->chart(); chart->legend()->setVisible(false); chart->setTitle("Nested donuts demo"); chart->setAnimationOptions(QChart::AllAnimations); qreal minSize = 0.1; qreal maxSize = 0.9; int donutCount = 5; for (int i = 0; i < donutCount; i++) { QPieSeries *donut = new QPieSeries; int sliceCount = 3 + QRandomGenerator::global()->bounded(3); for (int j = 0; j < sliceCount; j++) { qreal value = 100 + QRandomGenerator::global()->bounded(100); QPieSlice *slice = new QPieSlice(QString("%1").arg(value), value); slice->setLabelVisible(true); slice->setLabelColor(Qt::white); slice->setLabelPosition(QPieSlice::LabelInsideTangential); connect(slice, &QPieSlice::hovered, this, &Widget::explodeSlice); donut->append(slice); donut->setHoleSize(minSize + i * (maxSize - minSize) / donutCount); donut->setPieSize(minSize + (i + 1) * (maxSize - minSize) / donutCount); } m_donuts.append(donut); chartView->chart()->addSeries(donut); } // create main layout QGridLayout *mainLayout = new QGridLayout; mainLayout->addWidget(chartView, 1, 1); setLayout(mainLayout); updateTimer = new QTimer(this); connect(updateTimer, &QTimer::timeout, this, &Widget::updateRotation); updateTimer->start(1250); } Widget::~Widget() { } void Widget::updateRotation() { for (int i = 0; i < m_donuts.count(); i++) { QPieSeries *donut = m_donuts.at(i); qreal phaseShift = -50 + QRandomGenerator::global()->bounded(100); donut->setPieStartAngle(donut->pieStartAngle() + phaseShift); donut->setPieEndAngle(donut->pieEndAngle() + phaseShift); } } void Widget::explodeSlice(bool exploded) { QPieSlice *slice = qobject_cast<QPieSlice *>(sender()); if (exploded) { updateTimer->stop(); qreal sliceStartAngle = slice->startAngle(); qreal sliceEndAngle = slice->startAngle() + slice->angleSpan(); QPieSeries *donut = slice->series(); qreal seriesIndex = m_donuts.indexOf(donut); for (int i = seriesIndex + 1; i < m_donuts.count(); i++) { m_donuts.at(i)->setPieStartAngle(sliceEndAngle); m_donuts.at(i)->setPieEndAngle(360 + sliceStartAngle); } } else { for (int i = 0; i < m_donuts.count(); i++) { m_donuts.at(i)->setPieStartAngle(0); m_donuts.at(i)->setPieEndAngle(360); } updateTimer->start(); } slice->setExploded(exploded); }

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