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Syncfusion Feedback

Windows Forms Chart Log Scaling

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104708 Aug 10,2012 04:49 PM UTC Aug 15,2012 01:19 PM UTC WinForms 2
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Tags: Chart
Bruce Barker
Asked On August 10, 2012 04:49 PM UTC

I'm trying to create a bubble chart with a logrithmic scale on the y axis. The data I'm plotting ranges from 0.1 to 1000. When the chart is plotted, the minimum value for the y-axis is always 1 and much of the data plots below the X axis. I've tried setting the PrimaryYAxis.Range.Min = 0.1 but that doesn't do anything.The code is listed below, which first sets up the chart and then loads the data.
 
Thanks in advance.
 

Private Sub SetupChart()

_BubblePlot.ImprovePerformance =

True

_BubblePlot.CalcRegions =

False

ForeColor =

Color.DarkBlue

BackColor =

Color.AliceBlue

Font =

New Font("Trebuchet MS", 8)

_BubblePlot.BackInterior =

New BrushInfo(GradientStyle.None, Color.AliceBlue, Color.AliceBlue)

_BubblePlot.ChartInterior =

New BrushInfo(GradientStyle.ForwardDiagonal, Color.LightSteelBlue, Color.AliceBlue)

_BubblePlot.ChartArea.BackInterior =

New BrushInfo(GradientStyle.None, Color.AliceBlue, Color.AliceBlue)

_BubblePlot.PrimaryXAxis.Title =

"Oerflow Duration (Hours)"

_BubblePlot.PrimaryXAxis.Format =

"F0"

_BubblePlot.PrimaryXAxis.ValueType =

ChartValueType.Double

_BubblePlot.PrimaryYAxis.Title =

"Storm Return Period (Years)"

_BubblePlot.PrimaryYAxis.Format =

"0.#"

_BubblePlot.PrimaryYAxis.ValueType =

ChartValueType.Logarithmic

_BubblePlot.PrimaryYAxis.Origin = 0.1

_BubblePlot.PrimaryXAxis.TitleFont =

New System.Drawing.Font("Verdana", 9.0F, FontStyle.Bold)

_BubblePlot.PrimaryXAxis.TitleColor =

Color.SteelBlue

_BubblePlot.PrimaryYAxis.TitleFont =

New System.Drawing.Font("Verdana", 9.0F, FontStyle.Bold)

_BubblePlot.PrimaryYAxis.TitleColor =

Color.SteelBlue

_BubblePlot.PrimaryXAxis.LabelAlignment =

StringAlignment.Center

_BubblePlot.Titles.Clear()

Dim _Title As Syncfusion.Windows.Forms.Chart.ChartTitle

'>Main Title

_Title =

New Syncfusion.Windows.Forms.Chart.ChartTitle

_Title.Text =

"Bubble Size Reflects Relative Volume of Overflow"

_Title.Font =

New System.Drawing.Font("Verdana", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))

_BubblePlot.Titles.Add(_Title)

_Title =

New Syncfusion.Windows.Forms.Chart.ChartTitle

_Title.Text = Globals.Project.CSOBasin

_Title.Font =

New System.Drawing.Font("Verdana", 10.0!, System.Drawing.FontStyle.Italic, System.Drawing.GraphicsUnit.Point, CType(0, Byte))

_Title.Position =

ChartDock.Bottom

_Title.Alignment =

ChartAlignment.Far

_Title.Margin = 0

_BubblePlot.Titles.Add(_Title)

End Sub

Private Sub LoadChartData()

Dim RarestDuration(Globals.Project.NoCSOs - 1) As Single, RarestStormTr(Globals.Project.NoCSOs - 1) As Single

Dim CSODate(Globals.Project.NoCSOs - 1) As Date, CSODuration(Globals.Project.NoCSOs - 1) As Single, CSOVolume(Globals.Project.NoCSOs - 1) As Single

_BubblePlot.Series.Clear()

Globals.Project.RarestCSOResultsGet(RarestDuration, RarestStormTr)

Globals.Project.CSODataGet(CSODate, CSODuration, CSOVolume)

_series =

New ChartSeries("Bubble", ChartSeriesType.Bubble)

_series.Style.Symbol.Color =

Color.Blue

_BubblePlot.PrimaryYAxis.Range.Min = 0.1

For I As Integer = Globals.Project.NoCSOs - 1 To 0 Step -1

_series.Points.Add(CSODuration(I), RarestStormTr(I), CSOVolume(I))

Next

_BubblePlot.Series.Add(_series)

_BubblePlot.Refresh()

------

End Sub


Bruce Barker
Replied On August 10, 2012 05:26 PM UTC

I solved it. The min and max values for the axis are specified in log space. For a min value of 0.01 and a max of 1000 you specify:
 
PrimaryYAxis.Range.Min=Math.log10(0.01)
PrimaryYAxis.Range.Max=Math.log10(1000.0)
 

Vijayabharathi K [Syncfusion]
Replied On August 15, 2012 01:19 PM UTC

Hi Bruce,

Thanks for using Syncfusion products.

Please let us know if you require any further assistance.

Regards,

Vijayabharathi


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