C1Chart for WPF : Get Points in View on End User Interaction

ComponentOne Chart for WPF allows us to perform End User Interaction wherein we can zoom/ scale/ translate chart for a better view. As the title suggests, this blog explains the approach to get a list of all the points in the viewable area on Zooming, Scaling or Translating the ComponentOne Chart for WPF. The image below demonstrates the behavior discussed in this blog : WPF Chart Get Points In View To implement this, the GetPointsInView() method is used which returns the list of points as Data-Coordinates when any interaction (Zoom/Scale/Translate) is performed by the end-user. Here is the code that can be used :

List<Point> GetPointsInView(C1Chart chart)  
{  
 var list = new List<Point>();  
 int nser = chart.Data.Children.Count;  
 var xmin = GetAxisMin(chart.View.AxisX);  
 var xmax = GetAxisMax(chart.View.AxisX);  
 var ymin = GetAxisMin(chart.View.AxisY);  
 var ymax = GetAxisMax(chart.View.AxisY);  

 for (int i = 0; i < nser; i++)  
 {  
   var ds = chart.Data.Children[ i ] as XYDataSeries;  
   if (ds != null)  
   {  
     // fast access to data values  
     var values = ((IDataSeriesInfo)ds).GetValues();  
     if (values != null)  
      {  
        var len = values.GetLength(1);  
        for (int ipts = 0; ipts < len; ipts++)  
        {  
          var x = values[1, ipts];  
          var y = values[0, ipts];  
          if (!double.IsNaN(x) && !double.IsNaN(y))  
          {  
            if (xmin <= x && x <= xmax && ymin <= y && y <= ymax)  
            list.Add(new Point(x, y));  
          }  
        }  
      }  
   }  
 }  
 return list;  
}  

For complete implementation, kindly refer to the attached samples. DownloadSample_CS DownloadSample_VB