创建折线图
注： 这是 "带 Widgets 图库的图表"示例的一部分。
要创建折线图，需要一个QLineSeries 实例。让我们创建一个。
auto series = new QLineSeries;
然后向系列中添加数据。我们可以使用 append() 成员函数或流操作符。
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);
要在图表中显示数据，我们需要一个QChart 实例。我们将系列添加到其中，创建默认坐标轴，并设置图表标题。
auto chart = new QChart; chart->legend()->hide(); chart->addSeries(series); chart->createDefaultAxes(); chart->setTitle("Simple Line Chart");
然后创建一个QChartView 对象，并将QChart 作为参数。这样我们就不需要自己创建QGraphicsView 场景了。
createDefaultChartView(chart);
图表就可以显示了。
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