[Solved] Line chart graphed incorrectly when point falls outside visible area

[Keylight]

I have a line chart consisting of two points that is being graphed incorrectly when one point lies outside of the visible area of the chart.  This occurs when I have the both axis' AutoRange properties set to False and I am defining my own MinValue and MaxValues.  This was tested on Q2 2012 SP2 for Silverlight 5.

In the function below, both DataSeries represent the line y = 1 - x.

When the function parameter useAutoRange = True, both lines are graphed correctly (see attached autorangetrue.png).  Note that since the points of both DataSeries are derived from the same equation, the lines overlap (the red line is very short in the upper left part of the chart).

When the function parameter useAutoRange = False, the first line (blue) is NOT graphed correctly (see attached autorangefalse.png).  Note that the lines do not overlap anymore.

    Public Shared Function GetChartWithBug(useAutoRange As Boolean) As RadChart
        Dim c As New RadChart

        If Not useAutoRange Then
            Dim xAxis As Axis = c.DefaultView.ChartArea.AxisX
            xAxis.AutoRange = False
            xAxis.MinValue = 0
            xAxis.MaxValue = 50
            xAxis.Step = 10

            Dim yAxis As Axis = c.DefaultView.ChartArea.AxisY
            yAxis.AutoRange = False
            yAxis.MinValue = 0
            yAxis.MaxValue = 1
        End If

        Dim ds As DataSeries

        ds = New DataSeries
        ds.Add(New DataPoint(0, 1))
        ds.Add(New DataPoint(50, -49))
        c.DefaultView.ChartArea.DataSeries.Add(ds)

        ds = New DataSeries
        ds.Add(New DataPoint(0, 1))
        ds.Add(New DataPoint(1, 0))
        c.DefaultView.ChartArea.DataSeries.Add(ds)

        For Each ds1 As DataSeries In c.DefaultView.ChartArea.DataSeries
            Dim lsd As New LineSeriesDefinition
            lsd.ShowItemLabels = False
            lsd.ShowPointMarks = False
            ds1.Definition = lsd
        Next

        Return c
    End Function

[Nikolay]

Hi Michael,

Thank you for the sample code, this is indeed a scenario, in which the chart is not drawn correctly when a manual range is set and there are values outside of the defined range. The work-around is of course to use auto range or update the manual range.We have updated your telerik points for the feedback.

Regards,
Nikolay
the Telerik team

[Keylight]

Is this something that can be fixed by Telerik?  In my particular case, the axis min and max values will be chosen by the user, so I will need to recalculate the endpoints of my line.

[Ves]

Hi,

You can find the issue logged and track it here.

Best regards,
Ves
the Telerik team