How to make a zoom in a chart?

Question

Hello,

I'm programming with microsoft chart controls. But I don't know how to do a zoom.

My intention is to draw a square with gdi and do zoom the part of the square in the chart with the area of the square.

I've viewed the method scaleview.zoom, but I don't know how to use it. There isn't documentation with examples.

Could anybody write a expample about it?


Thank you very much.

PS. Sorry for my English.

Answer 1

Hi eldruida

no need to use GDI to draw a square

just need to set the IsUserSelectionEnabled property to true. Then you can put your cursor at the start of the range you want to zoom, hold the mouse button down, move it to the end of the range and release the button

try this in an app with 1 chartcontrol

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Dim rndm As New Random
        For i As Integer = 1 To 30
            Dim temp1 As Integer = rndm.Next(0, 31)
            Dim temp2 As Integer = rndm.Next(0, 31)
            Dim dpNew As DataPoint = New DataPoint
            With dpNew
                .BorderWidth = 2
                .MarkerBorderColor = Color.DarkBlue
                .MarkerBorderWidth = 2
                .MarkerColor = Color.Red
                .MarkerSize = 10
                .MarkerStyle = MarkerStyle.Star5
                .XValue = temp1
                .YValues(0) = temp2
                .Label = temp1.ToString & "," & temp2.ToString
            End With
            Chart1.Series(0).Points.Add(dpNew)
        Next

        Chart1.Series(0).ChartType = DataVisualization.Charting.SeriesChartType.Point
        Chart1.ChartAreas(0).AxisX.Interval = 1
        Chart1.ChartAreas(0).AxisX.Minimum = 0
        Chart1.ChartAreas(0).AxisX.Maximum = 31
        Chart1.ChartAreas(0).CursorX.IsUserSelectionEnabled = True
    End Sub

Answer 2

Thank you very much, xD. It was so easy.

You are the best.

Bye.

Answer 3

Hi, I tried implementing this in c# bu found that CursorX.IsUserSelectionEnabled isn't a valid statement. Any ideas on how to do this in c#?

Thanks,

Steve.

Answer 4

Can you show your C# code?

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Cephas Lin This posting is provided "AS IS" with no warranties.

Answer 5

<p>I am using the same code in C# but it dosnt support CursorX property for ChartAreas..</p><p>please help</p><p>Chart1.ChartAreas(0).CursorX.IsUserSelectionEnabled = True</p>