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#include "widget.h"
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#include <QChartView>
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#include <QPieSeries>
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#include <QPieSlice>
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#include <QTime>
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#include <QGridLayout>
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#include <QTimer>
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QTCOMMERCIALCHART_USE_NAMESPACE
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Widget::Widget(QWidget *parent)
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: QWidget(parent)
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{
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setMinimumSize(800, 600);
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qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
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//! [1]
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QChartView *chartView = new QChartView;
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chartView->setRenderHint(QPainter::Antialiasing);
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chartView->chart()->setAnimationOptions(QChart::AllAnimations);
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//! [1]
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//! [2]
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qreal minSize = 0.1;
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qreal maxSize = 0.9;
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int donutsCount = 5;
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//! [2]
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//! [3]
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for (int i = 0; i < donutsCount; i++) {
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QPieSeries *donut = new QPieSeries;
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donut->setDonut();
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int sliceCount = 3 + qrand() % 3;
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for (int j = 0; j < sliceCount; j++) {
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qreal value = 100 + qrand() % 100;
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QPieSlice *slice = new QPieSlice(QString("%1").arg(value), value);
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slice->setLabelVisible(true);
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slice->setLabelColor(Qt::white);
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slice->setLabelPosition(QPieSlice::LabelInsideTangential);
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connect(slice, SIGNAL(hovered(bool)), this, SLOT(explodeSlice(bool)));
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donut->append(slice);
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donut->setDonutInnerSize(minSize + i * (maxSize - minSize) / donutsCount);
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donut->setPieSize(minSize + (i + 1) * (maxSize - minSize) / donutsCount);
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}
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m_donuts.append(donut);
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chartView->chart()->addSeries(donut);
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}
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//! [3]
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// create main layout
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//! [4]
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QGridLayout* mainLayout = new QGridLayout;
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mainLayout->addWidget(chartView, 1, 1);
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setLayout(mainLayout);
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//! [4]
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//! [5]
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updateTimer = new QTimer(this);
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connect(updateTimer, SIGNAL(timeout()), this, SLOT(updateRotation()));
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updateTimer->start(1250);
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//! [5]
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}
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Widget::~Widget()
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{
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}
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//! [6]
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void Widget::updateRotation()
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{
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for (int i = 0; i < m_donuts.count(); i++) {
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QPieSeries *donut = m_donuts.at(i);
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qreal phaseShift = -50 + qrand() % 100;
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donut->setPieStartAngle(donut->pieStartAngle() + phaseShift);
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donut->setPieEndAngle(donut->pieEndAngle() + phaseShift);
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}
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}
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//! [6]
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//! [7]
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void Widget::explodeSlice(bool exploded)
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{
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QPieSlice *slice = qobject_cast<QPieSlice *>(sender());
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if (exploded) {
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updateTimer->stop();
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qreal sliceStartAngle = slice->startAngle();
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qreal sliceEndAngle = slice->startAngle() + slice->angleSpan();
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QPieSeries *donut = slice->series();
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qreal seriesIndex = m_donuts.indexOf(donut);
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for (int i = seriesIndex + 1; i < m_donuts.count(); i++) {
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m_donuts.at(i)->setPieStartAngle(sliceEndAngle);
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m_donuts.at(i)->setPieEndAngle(360 + sliceStartAngle);
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}
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} else {
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for (int i = 0; i < m_donuts.count(); i++) {
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m_donuts.at(i)->setPieStartAngle(0);
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m_donuts.at(i)->setPieEndAngle(360);
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}
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updateTimer->start();
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}
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slice->setExploded(exploded);
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}
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//! [7]
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