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#include "widget.h"
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#include <QGridLayout>
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#include <QPieSlice>
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#include <QTime>
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#include <QChartView>
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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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mainData(0)
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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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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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mainData = new QPieSeries;
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mainData->setPieSize(0.6);
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for (int j = 0; j < 4; j++) {
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// create new slice for the mainData
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QPieSlice *slice = new QPieSlice;
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slice->setLabelColor(Qt::white);
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mainData->append(slice);
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// create a new detailed data for the slice
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QPieSeries *donut = new QPieSeries;
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donut->setDonut();
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donut->setDonutInnerSize(mainData->pieSize());
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donut->setPieSize(mainData->pieSize() + 0.15);
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// when mainData slice is redrawn make sure the detailed data slices are aligned with it
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connect(slice, SIGNAL(startAngleChanged()), this, SLOT(updatedStartAngle()));
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connect(slice, SIGNAL(angleSpanChanged()), this, SLOT(updatedAngleSpan()));
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// create the detailed data
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for (int j = 0; j < 3; j++) {
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qreal value = 10 + qrand() % 100;
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QPieSlice *slice = new QPieSlice(QString("%1").arg(value), value);
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donut->append(slice);
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}
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donut->setLabelsPosition(QPieSlice::LabelOutside);
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donut->setLabelsVisible();
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detailedData.append(donut);
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// update the value and label of mainData
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slice->setValue(donut->sum());
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slice->setLabel(QString("%1").arg(donut->sum()));
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}
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mainData->setLabelsVisible();
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mainData->setLabelsPosition(QPieSlice::LabelInside);
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chartView->chart()->addSeries(mainData);
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for (int i = 0; i < detailedData.count(); i++)
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chartView->chart()->addSeries(detailedData.at(i));
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// create main layout
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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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// modify the value of one detailed slice every 2.5 sec
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QTimer *updateTimer = new QTimer(this);
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connect(updateTimer, SIGNAL(timeout()), this, SLOT(highlight()));
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updateTimer->start(2500);
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}
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Widget::~Widget()
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{
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}
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void Widget::updatedStartAngle()
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{
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// when the mainData slice has been updated the detailed data QPieSeries object as well
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QPieSlice* slice = qobject_cast<QPieSlice *>(sender());
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QPieSeries *detailsDonut = detailedData.at(slice->series()->slices().indexOf(slice));
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detailsDonut->setPieStartAngle(slice->startAngle());
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}
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void Widget::updatedAngleSpan()
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{
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// when the mainData slice has been updated the detailed data QPieSeries object as well
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QPieSlice* slice = qobject_cast<QPieSlice *>(sender());
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QPieSeries *detailsDonut = detailedData.at(slice->series()->slices().indexOf(slice));
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detailsDonut->setPieEndAngle(slice->startAngle() + slice->angleSpan());
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}
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void Widget::updateRotation()
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{
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// update the selected slice
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qreal newValue = 10 + qrand() % 100;
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detailedData.at(detailIndex)->slices().at(sliceIndex)->setValue(newValue);
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detailedData.at(detailIndex)->slices().at(sliceIndex)->setLabel(QString("%1").arg(newValue));
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// update the mainData slice with a new sum of the detailed data values
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mainData->slices().at(detailIndex)->setValue(detailedData.at(detailIndex)->sum());
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mainData->slices().at(detailIndex)->setLabel(QString("%1").arg(detailedData.at(detailIndex)->sum()));
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// change the explode state of the selected slice back to normal
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detailedData.at(detailIndex)->slices().at(sliceIndex)->setExploded(false);
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}
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void Widget::highlight()
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{
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// choose one random detailed data slice to be updated.
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detailIndex = qrand() % mainData->count();
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sliceIndex = qrand() % detailedData.at(detailIndex)->count();
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// set the slice to exploded to make the change easier to observe
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detailedData.at(detailIndex)->slices().at(sliceIndex)->setExploded();
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// give the user time to focus on the slice that will be changed
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QTimer::singleShot(1000, this, SLOT(updateRotation()));
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}
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