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Microsoft Chart vb.net - How to add labels to the x-axis

Posted on 2011-02-21
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Last Modified: 2012-05-11
I'm using the code below to create a chart. The chart is created fine and it gives me 31 tickmarks on the x-axis, but there are no labels. I'd like the labels to be on the tickmarks on the x-axis. The labels will be numbered according to the number of tickmarks, in this case 1 through 31. I've tried to find examples for custom labels but can't get anything to work. How can I generate these labels? Thanks!
dHRInterval = xValues.Count / RideDetail.RideDetailDistance.Text
            Chart1.Series.Add("HR")
            Chart1.Series("HR").ChartType = SeriesChartType.Line

            'Bind chart to ArrayList
            Chart1.Series("HR").Points.DataBindXY(xValues, yValues)
            Chart1.ChartAreas("ChartArea1").AxisX.Interval = dHRInterval
            Chart1.ChartAreas("ChartArea1").AxisX.IntervalOffset = 0

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Question by:myester
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Expert Comment

by:kdwood
ID: 34945778

myester,

I have a couple of chart projects I can take a look for you.   Off the top of my head, did you try setting the Axis label styel format as follows:

Chart1.ChartAreas("ChartArea1").AxisX.LabelStyle.Format = "####.####"  (or whatever number format you need)

Regards,

Keith


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Author Comment

by:myester
ID: 34946199
Keith thanks for the reply. I tried that and I still don't have any labels on the x-axis. I'm trying some different things with custom labels but can't get anything to work yet.
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Expert Comment

by:kdwood
ID: 34946580
myester,

I have a feeling it has to do with your dHRInterval.   I created a simple chart project, set the AxisX interval to 1 and the tick labels show up fine.  However, as I played with the interval and set it to values that exceeded my datapoints, I was able to get the label to disappear.

Here is my sample code:


Dim xValues As String() = {"Red", "Blue", "Green"}
        Dim yValues As Double() = {14, 8, 11}
        
        Chart1.Series.Add("HR")
        Chart1.Series("HR").ChartType = SeriesChartType.Line

        'Bind chart to ArrayList
        Chart1.Series("HR").Points.DataBindXY(xValues, yValues)
        Chart1.ChartAreas("ChartArea1").AxisX.Interval = 1
        Chart1.ChartAreas("ChartArea1").AxisX.IntervalOffset = 0

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Author Comment

by:myester
ID: 34947532
Keith, in this case the dHRInterval is a little over 42 and there are 1318 datapoints. The dHRInterval is going to vary from say 25 to 75 or a 100. The datapoints will vary too and will always exceed the values generated by the interval. In this chart the datapoints represent a heart rate value and the x-axis will be the mileage ridden on a bike ride. The calculation that generates dHRInterval gives me one tickmark for each mile so I need to keep that. I think I may be on to something with custom labels. If you can think of anything else please let me know. In the meantime when I get some more time to work on this I'll see if I can get the custom labels working and let you know how it goes. Thanks!
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Accepted Solution

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myester earned 0 total points
ID: 34948000
Keith,

I have the custom labels working with the code below. I appreciate your response.

Dim dHRIntervalConstant As Double = dHRInterval
            Dim i As Integer = 1
            For index As Double = 0 To RideDetail.RideDetailDistance.Text
                Chart1.ChartAreas(0).AxisX.CustomLabels.Add(New CustomLabel(dHRInterval - 10, dHRInterval + 10, i.ToString, 1, LabelMarkStyle.None))
                dHRInterval = dHRInterval + dHRIntervalConstant
                i = i + 1
            Next
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Author Closing Comment

by:myester
ID: 34986603
I found the solution on my own.
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