void Widget::plotQtChart()
{
QChart* chart = ui->qtChart->chart();
if(!chart)
{
chart = new QChart();
ui->qtChart->setChart(chart);
}
QValueAxis * axisX = qobject_cast<QValueAxis *>(chart->axisX());
QValueAxis * axisY = qobject_cast<QValueAxis *>(chart->axisY());
QLineSeries* line = NULL;
if(chart->series().size()>0)
{
line = qobject_cast<QLineSeries*>(chart->series().at(0));
}
else
{
line = new QLineSeries;
}
line->setUseOpenGL(true);
chart->addSeries(line);
line->attachAxis(axisX);
line->attachAxis(axisY);
QVector<QPointF> points;
for(int i=0;i<320000;++i)
{
points.append(QPointF(i,sin(i)));
}
line->replace(points);
}
QChart *createChart(const DataTable &table)
{
QChart *chart = new QChart();
chart->setTitle("Value X , Value Y");
QString name("Series ");
int nameIndex = 0;
foreach (DataList list, table) {
QLineSeries *series = new QLineSeries(chart);
foreach (Data data, list)
series->append(data.first);
series->setName(name + QString::number(nameIndex));
nameIndex++;
chart->addSeries(series);
}
int main(int argc, char *argv[]) {
QApplication a(argc, argv);
QWidget ui;
QVBoxLayout layout(&ui);
QChartView view1, view2;
QLabel status;
layout.addWidget(&view1);
layout.addWidget(&view2);
layout.addWidget(&status);
layout.setMargin(4);
QLineSeries series;
series.replace(data());
auto *chart = view1.chart();
chart->addSeries(&series);
view1.setRubberBand(QChartView::RectangleRubberBand);
QLineSeries subSeries;
subSeries.setPointsVisible(true);
auto *subChart = view2.chart();
subChart->addSeries(&subSeries);
for (auto *chart : {view1.chart(), view2.chart()}) {
chart->legend()->hide();
chart->createDefaultAxes();
chart->layout()->setContentsMargins(0, 0, 0, 0);
}
auto update = [&] {
auto rect = seriesRect(chart, &series);
auto const points = pointsInRect(&series, rect);
status.setText(QStringLiteral("Visible Range: (%1,%2)-(%3,%4)")
.arg(rect.left())
.arg(rect.top())
.arg(rect.right())
.arg(rect.bottom()));
subSeries.replace(points);
subChart->axisX(&subSeries)->setRange(rect.left(), rect.right());
subChart->axisY(&subSeries)->setRange(rect.top(), rect.bottom());
};
QObject::connect(chart, &QChart::plotAreaChanged, update);
ui.setMinimumSize(400, 400);
ui.show();
return a.exec();
}
static void addPoint( QLineSeries& line, FrameContainer& container, int index, Point<bool> moves ){
auto pos = container.pos( index );
auto real_index = container.realIndex( index );
line.append(
moves.x ? pos.x : real_index
, moves.y ? pos.y : real_index
);
}
QTCOMMERCIALCHART_USE_NAMESPACE
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
//![1]
QLineSeries* series = new QLineSeries();
//![1]
//![2]
series->append(10, -6);
series->append(12, 4);
series->append(13, 8);
series->append(17, 4);
series->append(20, 5);
*series << QPointF(11, 1) << QPointF(13, 3) << QPointF(17, 6) << QPointF(18, 3) << QPointF(20, 2);
//![2]
//![3]
QChart* chart = new QChart();
chart->addSeries(series);
chart->setTitle("Simple line chart example");
// ×ø±ê·¶Î§ÉèÖã¬Èç¹û²»³õʼ»¯£¬x·¶Î§Îª×ÔÊÊÓ¦
chart->axisX()->setRange(-10, 10); // ³õʼ»¯ºá×ø±ê·¶Î§
chart->axisY()->setRange(20, 30); // ³õʼ»¯×Ý×ø±ê·¶Î§
//![3]
//![4]
QChartView* chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);
//![4]
//![5]
QMainWindow window;
window.setCentralWidget(chartView);
window.resize(400, 300);
window.show();
//![5]
return a.exec();
}
QT_CHARTS_USE_NAMESPACE
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
//![1]
QLineSeries *series = new QLineSeries();
//![1]
//![2]
// data from http://www.swpc.noaa.gov/ftpdir/weekly/RecentIndices.txt
// http://www.swpc.noaa.gov/ftpdir/weekly/README
// http://www.weather.gov/disclaimer
QFile sunSpots(":sun");
if (!sunSpots.open(QIODevice::ReadOnly | QIODevice::Text)) {
return 1;
}
QTextStream stream(&sunSpots);
while (!stream.atEnd()) {
QString line = stream.readLine();
if (line.startsWith("#") || line.startsWith(":"))
continue;
QStringList values = line.split(" ", QString::SkipEmptyParts);
QDateTime momentInTime;
momentInTime.setDate(QDate(values[0].toInt(), values[1].toInt() , 15));
series->append(momentInTime.toMSecsSinceEpoch(), values[2].toDouble());
}
sunSpots.close();
//![2]
//![3]
QChart *chart = new QChart();
chart->addSeries(series);
chart->legend()->hide();
chart->setTitle("Sunspots count (by Space Weather Prediction Center)");
//![3]
//![4]
QDateTimeAxis *axisX = new QDateTimeAxis;
axisX->setTickCount(10);
axisX->setFormat("MMM yyyy");
axisX->setTitleText("Date");
chart->addAxis(axisX, Qt::AlignBottom);
series->attachAxis(axisX);
QValueAxis *axisY = new QValueAxis;
axisY->setLabelFormat("%i");
axisY->setTitleText("Sunspots count");
chart->addAxis(axisY, Qt::AlignLeft);
series->attachAxis(axisY);
//![4]
//![5]
QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);
//![5]
//![6]
QMainWindow window;
window.setCentralWidget(chartView);
window.resize(820, 600);
window.show();
//![6]
return a.exec();
}
QChart *createChart(const DataTable &table)
{
QChart *chart = new QChart();
chart->setTitle("DateTime X , Value Y");
QValueAxis *valueaxis = new QValueAxis();
QDateTimeAxis *datetimeaxis = new QDateTimeAxis();
datetimeaxis->setTickCount(10);
datetimeaxis->setFormat("yyyy");
qreal day = 1000l * 60l * 60l * 24l;
QString name("Series ");
int nameIndex = 0;
foreach (DataList list, table) {
QLineSeries *series = new QLineSeries(chart);
foreach (Data data, list) {
QPointF point = data.first;
series->append(day * 365l * 30l + point.x() * day * 365l, point.y());
}
