//Show a point on the profile line when user clicks on a data point on the graph
private void LineSeries_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
//Remove any existing graphic from the data point layer
selecteDataPointLyr.Graphics.Clear();
//When ClearGraphics_Click occurs, all data points will be removed and no new data points will be added
//In this case, skip the rest of the method
if (e.RemovedItems.Count > 0 && e.AddedItems.Count == 0)
{
return;
}
PointCollection profilePointCol = Profile.Paths.FirstOrDefault();
if (profilePointCol == null || profilePointCol.Count == 0)
{
return;
}
//From the profile line, we get the map point whose m value is the same
//as user's selected data point on the graph
double m = ((KeyValuePair <double, double>)e.AddedItems[0]).Key; //M value of the data point selected from the graph
MapPoint mapPoint = profilePointCol.FirstOrDefault(mp => mp.M == m); //Get the map point from the profile line with the same m value
if (mapPoint == null)
{
return;
}
//Create a point graphic with the map point and a symbol
client.Graphic dataPointGraphic = new client.Graphic()
{
Symbol = SimplePointSymbol.CreatePointSymbol(),
Geometry = mapPoint
};
//Add the graphic to the data point layer
selecteDataPointLyr.Graphics.Add(dataPointGraphic);
//If we can find the data point layer, we first remove it
if (MapWidget.Map.Layers.Contains(selecteDataPointLyr))
{
MapWidget.Map.Layers.Remove(selecteDataPointLyr);
}
//Add the point layer back to make sure it always stay on top
MapWidget.Map.Layers.Add(selecteDataPointLyr);
}