charts - 如何根据 wpf 图表工具包中的图形找到鼠标单击位置坐标

Question

我正在研究 Wpf 工具包的图表。我将 x 轴设为 Freuency，将 Y 轴设为即时级别。该图是实时图。

我需要知道用户点击的点的坐标。

是否有任何事件引发或任何属性，我可以获得当前鼠标点坐标，或者我需要按照我自己的意思计算它，没有可用的内置方法。

提前致谢。

DJ

Answer 1

我认为这应该有所帮助：

Private Sub GroupChart_MouseLeftButtonDown(sender As Object, e As System.Windows.Input.MouseButtonEventArgs) 处理 GroupChart.MouseLeftButtonDown

    Dim SelectedIndex As Integer

    Dim element As DependencyObject = Mouse.DirectlyOver
    While (element IsNot Nothing And Not (TypeOf element Is ScatterDataPoint))
        element = VisualTreeHelper.GetParent(element)
    End While
    If Not IsNothing(element) Then
        Dim foundDataPoint As ScatterDataPoint = element
        Dim foundCanvas = VisualTreeHelper.GetParent(element)

        Dim ChildCount = VisualTreeHelper.GetChildrenCount(foundCanvas)

        For i = 0 To ChildCount - 1

            Dim CurrentContentPresenter = VisualTreeHelper.GetChild(foundCanvas, i)

            If Object.ReferenceEquals(foundDataPoint, CurrentContentPresenter) Then
                SelectedIndex = i
                Exit For
            End If

        Next

    End If

End Sub