Updated

Author: Sowndharya1911

GetDataPointsSample/SelectionZoomEvent.xaml

@@ -13,7 +13,6 @@
 
     <chart:SfCartesianChart HorizontalOptions="Fill" VerticalOptions="Fill" 
                            x:Name="cartesianChart" 
-                           IsTransposed="True"
                            SelectionZoomDelta="Chart_SelectionZoomDelta"
                            SelectionZoomEnd="Chart_SelectionZoomEnd">
 
@@ -31,7 +30,10 @@
         </chart:SfCartesianChart.YAxes>
 
         <chart:SfCartesianChart.Series>
-            <chart:ScatterSeries ItemsSource="{Binding Data}" XBindingPath="XValue" YBindingPath="YValue"  Opacity="0.8" Fill="#FE7A36"  >
+            <chart:ScatterSeries ItemsSource="{Binding Data}" XBindingPath="XValue" YBindingPath="YValue"  
+                                 Opacity="0.8" Fill="#FE7A36" 
+                                 PointWidth="8"
+                                 PointHeight="8">
                 <chart:ScatterSeries.SelectionBehavior>
                     <chart:DataPointSelectionBehavior Type="Multiple"  SelectionBrush="#3652AD"/>
                 </chart:ScatterSeries.SelectionBehavior>

GetDataPointsSample/SelectionZoomEvent.xaml.cs

@@ -13,36 +13,31 @@ private void Chart_SelectionZoomDelta(object sender, ChartSelectionZoomDeltaEven
     {
         var selectedIndexes = new List<int>();
 
-        if (cartesianChart is SfCartesianChart)
+        foreach (var series in cartesianChart.Series)
         {
-            foreach (var series in cartesianChart.Series)
+            if (series is ScatterSeries scatterSeries)
             {
-                if (series is ScatterSeries scatterSeries)
-                {
-                    var rect = new Rect(e.ZoomRect.X - cartesianChart.SeriesBounds.Left, e.ZoomRect.Y, e.ZoomRect.Width, e.ZoomRect.Height);
-                    var dataPoints = scatterSeries.GetDataPoints(rect);
+                var rect = new Rect(e.ZoomRect.X - cartesianChart.SeriesBounds.Left, e.ZoomRect.Y, e.ZoomRect.Width, e.ZoomRect.Height);
+                var dataPoints = scatterSeries.GetDataPoints(rect);
 
-                    if (dataPoints != null && viewModel != null)
+                if (dataPoints != null && viewModel != null)
+                {
+                    for (int i = 0; i < viewModel.Data.Count; i++)
                     {
-                        for (int i = 0; i < viewModel.Data.Count; i++)
-                        {
-                            if (dataPoints.Contains(viewModel.Data[i]))
-                                selectedIndexes.Add(i);
-                        }
-                        scatterSeries.SelectionBehavior.SelectedIndexes = selectedIndexes;
+                        if (dataPoints.Contains(viewModel.Data[i]))
+                            selectedIndexes.Add(i);
                     }
+                    scatterSeries.SelectionBehavior.SelectedIndexes = selectedIndexes;
                 }
             }
         }
-
     }
+
     private void Chart_SelectionZoomEnd(object sender, ChartSelectionZoomEventArgs e)
     {
         primaryAxis.ZoomFactor = 1;
         primaryAxis.ZoomPosition = 0;
         secondaryAxis.ZoomFactor = 1;
         secondaryAxis.ZoomPosition = 0;
     }
-
-}
-
+}