Hi,

I have a list of questions regarding the use of the line chart. I apologize ahead for its length, and appreciate your help.

1. I tried to show labels on the line chart points, and now I occasionally receive the following exception:

Unhandled exception occured in UI thread System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
at System.Collections.ArrayList.get_Item(Int32 index)
at MindFusion.Charting.LineChartMeasurer.addLabels()
at MindFusion.Charting.LineChartMeasurer.PrepareVertLines()
at MindFusion.Charting.LineChart.Draw()
at MindFusion.Charting.AxesChart.DrawChart()
at MindFusion.Charting.Chart.CalculateSize()
at MindFusion.Charting.WinForms.Chart.CalcRect()
at MindFusion.Charting.WinForms.Chart.UpdateChartInternal()
at MindFusion.Charting.WinForms.LineChart.set_LabelType(LabelType value)
at MDMindFusionChart.SetChartProps() in D:\...\MDMindFusionChart.cs:line 151

The line in the code the exception gets thrown at is when setting the LabelType (i.e. this.lineChart.LabelType = MindFusion.Charting.LabelType.CustomText;).
Are you familiar with this issue ?

2. Also, when showing the labels, some of them are not shown (see attached screen shots). For instance, the rightmost label, or point labels when zooming in.

3. When I zoom in multiple times, I get an "overflow error" exception.
This occurs only when I register to ZoomChanged event, Even when the event handler is empty. Are you familiar with this behavior ?

4. Is it possible to control the tool tip tolerance ? Currently a delicate adjustment when moving the mouse is required to show the tool tips (especially at the edges of the graph) and I wish to be able to increase the tolerance so the tool tips will be shown more easily.

5. Is it possible to customize the "zoom in" icon ? (personally I think it's cool, but it came from one of our customers, who wishes to replace the icon...)

Thanks, and sorry again for the long list...
Nir

Hi Stoyan,

Attached is a solution which reproduces the overflow issue.
Steps to reproduce:
1. Unzip the solution.

2. Add references (I had to remove them because maximum allowed file size limitation)
MindFusion.Charting.dll version 3.5.1.40346
MindFusion.Charting.WinForms.dll version 3.5.1.40347
MindFusion.Common.dll version version 1.3.0.19101

3. Compile & Run solution.

3. Click the command button to display the chart on a user control.

4. Zoom in several times quickly and receive the overflow exception.

The other issue is a bit more trickier to reproduce. It may involve additional parameters. I will upload it once I complete it.

Thanks,
Nir

Hi Stoyan,

Thank you very much for your help.

I was able to reproduce the issue with the index exception.
Apparently the exception is thrown when I have a single record in the data table. In order to reproduce it on your side, please take the solution I have sent you and comment the following lines in Form1.button1_click() method:

//dataTable.Rows.Add("01/01/2012", 41.456);
//dataTable.Rows.Add("01/01/2014", 30);

This leaves the DataTable with a single row.

Run the solution and you shell receive the exception.

Thanks,
Nir

Hi Stoyan,

Thank you very much for your help.

Most of the issues seems to be resolved (I still need to get feedback from my customers regarding some).

I no longer get the index exception. However, I get a null exception on the test solution I sent you (referencing the new DLLs now).
Specifically on my project I don't get any exception but I see just the label without the point.

Thanks,
Nir

Thanks Stoyan

It works 

Nir

Hi Nir,

For the floating point numbers problem try setting XAxisSettings.DataFormat = Number. The default Auto format might be deciding you are providing date/time values and drawing them away from the currently visible interval.

On the PM page you can find updated version of the control that won't clip labels.

I hope that helps,
Stoyan

Hi,

We can't see any problem showing a single value at 0 in your test project. What should we change to make it disappear?

Stoyan

The label at Y=0 seems to get out of the visible range because of these lines in the test project:

this.lineChart.YAxisSettings.MinValue = 10;
this.lineChart.YAxisSettings.MaxValue = 80;

Anyway we've fixed an alignment bug happening with that label, you can find updated assembly on the PM page.

I hope that helps,
Stoyan