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);
}
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();
}
