樣條綫圖錶範例

範例展示如何創建簡單樣條綫圖錶。

運行範例

要運行範例從 Qt Creator ，打開歡迎模式，然後選擇範例從範例。更多信息，拜訪構建和運行範例 .

創建樣條綫圖錶

要創建樣條綫圖錶，需要將數據放入 QSplineSeries . QSplineSeries automatically calculates spline segment control points that are needed to properly draw the spline.

QSplineSeries *series = new QSplineSeries();
series->setName("spline");

Now let's add some data points to the series.

series->append(0, 6);
series->append(2, 4);
series->append(3, 8);
series->append(7, 4);
series->append(10, 5);
*series << QPointF(11, 1) << QPointF(13, 3) << QPointF(17, 6) << QPointF(18, 3) << QPointF(20, 2);

The data series has been populated. To display it on a chart we create a QChart object and add the data series to it. We also set the title and the values range on the y-axis, so that our chart's visibility is better.

QChart *chart = new QChart();
chart->legend()->hide();
chart->addSeries(series);
chart->setTitle("Simple spline chart example");
chart->createDefaultAxes();
chart->axes(Qt::Vertical).first()->setRange(0, 10);

Then we create a QChartView 對象采用 QChart as a parameter. This way we don't need to create a QGraphicsView scene ourselves. We also set the Antialiasing on to have the rendered lines look nicer.

QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);

Finally, we set the QChartView as the windows's central widget.

QMainWindow window;
window.setCentralWidget(chartView);
window.resize(400, 300);
window.show();

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