Creating Line Charts

Shows how to create a simple line chart.

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The Qt Company Ltd.

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Publié le 14 février 2024 - Mis à jour le 14 février 2024

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Creating Line Charts▲

This is part of the Charts with Widgets Gallery example.

To create a line chart, a QLineSeries instance is needed. Let's create one.

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auto series = new QLineSeries;

Then we add data to the series. We can use the append() member function or use the stream operator.

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

To present the data on the chart we need a QChart instance. We add the series to it, create the default axes, and set the title of the chart.

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auto chart = new QChart;
chart-&gt;legend()-&gt;hide();
chart-&gt;addSeries(series);
chart-&gt;createDefaultAxes();
chart-&gt;setTitle("Simple Line Chart");

Then we create a QChartView object with QChart as a parameter. This way we don't need to create a QGraphicsView scene ourselves.

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createDefaultChartView(chart);

The chart is ready to be shown.

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