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Reg: Negative Angles in Polar Point Charts

Posted By Ashis Mohapatra 4 Months Ago
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Ashis Mohapatra
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Hi Everyone, 

I have been using Nevron Polar Charts to plot data points at positive and negative swing angles. 
1. The angles of the chart start from 0-360 

2. Is there any way I can have the first and fourth quadrant as positive angles(0 - 180) and second and third quadrant with negative angles(-1 till -180) 

3. In short I want to mirror it from the centre ie. 0 deg
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Nevron Support
Posted 4 Months Ago
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Hi Ashis,

The only way to achieve this number is by using custom code - we could not find a way to achieve it with the standard .net format strings. The following code (which you need to paste in the code tab of the control) shows how to install a custom value formatter that formats all values after 180 degrees with their negative equivalent:

using System;
using System.Drawing;
using Nevron.Dom;
using Nevron.GraphicsCore;
using Nevron.Chart;
using Nevron.ReportingServices;

namespace MyNamespace
{
  class NCustomValueFormatter : NNumericValueFormatter
  {
   public override string FormatValue(double value)
   {
    if (value > 180)
    {
      value = -(360 - value);
    }

    return value.ToString();
   }

   public override string FormatValue(object obj)
   {
    return FormatValue((double)obj);
   }
  }
/// <summary>
/// Sample class
/// </summary>
public class MyClass
{
/// <summary>
/// Main entry point
/// </summary>
/// <param name="context"></param>
public static void RSMain(NRSChartCodeContext context)
{
NPolarChart polarChart = (NPolarChart)context.document.Charts[0];

NAngularScaleConfigurator angularScale = (NAngularScaleConfigurator)polarChart.Axis(StandardAxis.PolarAngle).ScaleConfigurator;
angularScale.LabelValueFormatter = new NCustomValueFormatter();
}
}
}

We hope this helps - let us know if you meet any problems or have any questions.



Best Regards,
Nevron Support Team



Ashis Mohapatra
Posted 4 Months Ago
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Thank you so much, it works perfectly. Smile 



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