创建线图表

要创建线图表， QLineSeries 实例是需要的。让我们创建一个。

auto series = new QLineSeries;
				

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

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);
				

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.

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

Then we create a QChartView 对象采用 QChart as a parameter. This way we don't need to create a QGraphicsView scene ourselves.

createDefaultChartView(chart);
				

图表展示就绪。