Updating a charts points during runtime

[lavaski]

Hi guys,

Big thanks to everyone who has helped me over the past couple of weeks.

I am currently creating a line graph in one form using an array that I have stored in a module, the array is configured in another form. As a value is added to the array I would like the graph to recognize this and plot the new point.

To make this clearer, on a click event a number is stored in the array, that array is then used by the chart. The chart then plots the new point in front of the user.
Below is my code and in bold is how I am using my array with the chart.

        With RChart.ChartAreas(0)
            .AxisX.Minimum = 1

            .AxisX.Maximum = 10

            .AxisY.Minimum = 0

            .AxisY.Maximum = 30

            .AxisY.Interval = 10

            .AxisX.Title = "Samples"

            .AxisY.Title = "Range"

        End With

        RChart.Series("Range").MarkerStyle = MarkerStyle.Circle
        RChart.Series("Range").MarkerColor = Color.Black
        RChart.Series("Range").MarkerSize = 5
        RChart.Series("Range").ChartType = DataVisualization.Charting.SeriesChartType.Line
        RChart.Series("Range").Points.DataBindXY(pNumofSamples, pRange2)

So far I have tried:

Looping through the above code until the form is closed with application.doEvents() - this didn't work.
Calling a procedure that did the same as above, Setting a timer to iterate through the above code. For these I get the error "Enumeration already finished." Pointing to ----> RChart.Series("Range").Points.DataBindXY(pNumofSamples, pRange2)

I have also tried multi-threading, using Me.CheckForIllegalCrossThreadCalls = False.. This also failed. I have had a search across the forum and can't seem to find a solution. I have read a bit about delegates and this could be a possible solution, however I'm wondering if anyone knows where I am going wrong or a way to solve my problem?

Again, appreciate the help.

Cheers.

[dunfiddlin]

Try releasing the binding and reapplying it. Also where do pNumofSamples, pRange2 get set? If they do not change then you will indeed get the enumeration finished error (been there, done that, in other words!)

[lavaski]

Try releasing the binding and reapplying it. Also where do pNumofSamples, pRange2 get set? If they do not change then you will indeed get the enumeration finished error (been there, done that, in other words!)

How would I go about releasing the binding, I have tried creating a sub that runs on each click event but after the data is stored in the arrays that are used to plot the data.

    Sub refreshChart()
        If ControlCharts.Created = True Then
            ControlCharts.RChart.DataBindings.Clear()

            ControlCharts.RChart.Series("Range").Points.DataBindXY(totalSamples, pRanges)
        End If

I still get the same error "Enumeration already finished." The arrays definitely changes, they are set in the main form. They will contrain one new number each time the sub is called.. Any Ideas ?

[lavaski]

Hi just a quick update,

I have the above working somewhat. What I have done is put the charts on the main form (they were on a separate form using arrays from the main form). From there I loaded the charts in form load, basically the code in my first post except I used RChart.Series("Range").Points.DataBindY pRange) As the chart doesn't need the X axis if its just a the number of the sample.. it can keep track of that pretty well..
From here, on the click event mentioned above that assigns a value into the array pRanges, I simply use RChart.Series("Range").Points.DataBindY pRange) again. No clearing of the data binding needed/Releasing. This was essentially what I first tried to do when I had the charts in a separate form. So its not exactly a proper fix as it wasn't what I initially wanted, but will suffice. Hopefully this helps anyone else with a similar problem.