创建区域图表

要创建区域图表，我们需要两个QLineSeries 实例。它们将定义区域的上下边界。

auto series0 = new QLineSeries;
auto series1 = new QLineSeries;

我们为两个序列添加数据并使用流运算符。

*series0 << QPointF(1, 5) << QPointF(3, 7) << QPointF(7, 6) << QPointF(9, 7) << QPointF(12, 6)
         << QPointF(16, 7) << QPointF(18, 5);
*series1 << QPointF(1, 3) << QPointF(3, 4) << QPointF(7, 3) << QPointF(8, 2) << QPointF(12, 3)
         << QPointF(16, 4) << QPointF(18, 3);

现在，我们使用两个线性序列对象创建一个QAreaSeries 实例。我们设置自定义渐变填充和轮廓宽度。

auto series = new QAreaSeries(series0, series1);
series->setName("Batman");
QPen pen(0x059605);
pen.setWidth(3);
series->setPen(pen);

QLinearGradient gradient(QPointF(0, 0), QPointF(0, 1));
gradient.setColorAt(0.0, 0x3cc63c);
gradient.setColorAt(1.0, 0x26f626);
gradient.setCoordinateMode(QGradient::ObjectBoundingMode);
series->setBrush(gradient);

最后，我们创建QChartView 实例，设置标题、抗锯齿并添加区域系列。我们还创建了默认坐标轴，并指定了坐标轴上的范围。

auto chart = new QChart;
chart->addSeries(series);
chart->setTitle("Simple Area Chart");
chart->createDefaultAxes();
chart->axes(Qt::Horizontal).first()->setRange(0, 20);
chart->axes(Qt::Vertical).first()->setRange(0, 10);

图表就可以显示了。

createDefaultChartView(chart);

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