QChart 设置部分图例隐藏场景介绍

在我们绘制QChart图形中，如果需要绘制折线柱状等多种格式序列时，我们只想柱状图显示图例怎，折线图例隐藏怎么实现呢？

QChart 设置部分图例隐藏解决办法

关键词： 
所有序列标记：QList<QLegendMarker *> QLegend::markers(QAbstractSeries *series = Q_NULLPTR) const

枚举值： enum QLegendMarker::LegendMarkerType
The type of the legend marker object.This enum was introduced or modified in Qt 5.8.
Constant Value Description
QLegendMarker::LegendMarkerTypeArea 0 A legend marker for an area series.
QLegendMarker::LegendMarkerTypeBar 1 A legend marker for a bar set.
QLegendMarker::LegendMarkerTypePie 2 A legend marker for a pie slice.
QLegendMarker::LegendMarkerTypeXY 3 A legend marker for a line, spline, or scatter series.
QLegendMarker::LegendMarkerTypeBoxPlot 4 A legend marker for a box plot series.
QLegendMarker::LegendMarkerTypeCandlestick 5 A legend marker for a candlestick series. 
foreach (QLegendMarker* marker, chart->legend()->markers())

 {
    if(marker->type() == QLegendMarker::LegendMarkerTypeXY)
    {
       marker->setVisible(false);
    }
}