创建折线图
注意：这是 “带小部件的图表”示例库的一部分。
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，我们将数据添加到该系列中。我们可以使用 append() 成员函数，也可以使用流运算符。
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);要在图表上显示数据，我们需要一个 QChart 实例。我们将系列添加到该实例中，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");接着，我们创建一个以 QChart 为参数的 QChartView 对象。这样，我们就无需自己创建QGraphicsView 场景了。
createDefaultChartView(chart);图表现已准备就绪，可以显示了。
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