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Add labels to points

#1

I’m showing vehicle locations on a map, and I’m now trying to add labels to the points. I’ve created a second EditInteractiveOverlay layer in order to hold the labels. I’m setting it up as follows:




01.EditInteractiveOverlay labelOverlay = new EditInteractiveOverlay();
02.                   interactiveOverlay.DragControlPointsLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle.IsActive = false;
03.                   interactiveOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle.IsActive = false;
04.                   interactiveOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle.IsActive = false;
05. 
06.                   //ValueStyle used for displaying the feature according to the value of the column “Type” for displaying with a bus or car icon.
07.                   ValueStyle labelValueStyle = new ValueStyle();
08.                   labelValueStyle.ColumnName = “UnitLabel”;
09. 
10.                   // AVL
11.                   TextStyle unitTextStyle = new TextStyle(“UnitLabel”, new GeoFont(this._settings.UnitTextFont, this._settings.UnitTextSize, DrawingFontStyles.Regular), new GeoSolidBrush(GeoColor.FromHtml(this._settings.UnitTextColor)));
12.                   unitTextStyle.XOffsetInPixel = 20;
13.                   labelValueStyle.ValueItems.Add(new ValueItem(“U”, unitTextStyle));
14.                    
15.                   // Calls
16.                   TextStyle callTextStyle = new TextStyle(“CallLabel”, new GeoFont(this._settings.UnitTextFont, this._settings.UnitTextSize, DrawingFontStyles.Regular), new GeoSolidBrush(GeoColor.FromHtml(this._settings.UnitTextColor)));
17.                   callTextStyle.XOffsetInPixel = 20;
18.                   labelValueStyle.ValueItems.Add(new ValueItem(“C”, callTextStyle));
19. 
20.                   labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(labelValueStyle);
21.                   labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
22. 
23.                   labelOverlay.EditShapesLayer.Open();
24.                   labelOverlay.EditShapesLayer.Columns.Add(new FeatureSourceColumn(“LabelType”));
25.                   labelOverlay.EditShapesLayer.Columns.Add(new FeatureSourceColumn(“UnitLabel”));
26.                   labelOverlay.EditShapesLayer.Columns.Add(new FeatureSourceColumn(“CallLabel”));
27.                   labelOverlay.EditShapesLayer.Close();
28. 
29.                   labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle.IsActive = false;
30.                   labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle.IsActive = false;
31.                   labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle.IsActive = false;
32.                   labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.IsActive = false;
33. 
34.                   this.map.InteractiveOverlays.Add(“Labels”, labelOverlay);





When I try to place the label on the map, I use the following:


01.PointShape pointShape = new PointShape(unit.Status.Longitude, unit.Status.Latitude);
02.                        pointShape.Tag = unit;
03. 
04.                        if (feature != null)
05.                        {
06.                            caOverlay.EditShapesLayer.InternalFeatures.Remove(feature);
07.                        }
08.                        if (labelFeature != null)
09.                        {
10.                            labelOverlay.EditShapesLayer.InternalFeatures.Remove(labelFeature);
11.                        }
12. 
13.                        Feature f = new Feature(pointShape);
14.                        Feature fl = new Feature(pointShape);
15. 
16.                        System.Diagnostics.Debug.WriteLine("X: " + pointShape.X + ", Y: " + pointShape.Y + ", Tag: " + unit.UnitId);
17.                        f.ColumnValues[“Type”] = unit.Agency.AgencyType + “-” + unit.Status.UnitStatusIndicator;
18.                         
19.                        fl.ColumnValues[“UnitLabel”] = unit.UnitId;
20.                        fl.ColumnValues[“LabelType”] = “U”;
21.                         
22.                        caOverlay.EditShapesLayer.InternalFeatures.Add(unit.UnitId, f);
23.                        labelOverlay.EditShapesLayer.InternalFeatures.Add(unit.UnitId, fl);



I’m not certain why the labels don’t display. The values are being added to the labelOverlay layer because I can see them listed in the collection but they don’t show up on the map. Any suggestions?

#2

Hi Clay,



Thanks for your further information, attached is the sample code for your reference, would you please try it again

if you have any more question , please feel free to let us know.


Best Regards


Summer



Post11894Sample.txt (2.18 KB)

#3

Thanks for your help Summer. I finally was able to get back to this and your code helped me immensely. Thanks!

#4

Hi Clay, 
  
 We are glad to hear your problem is solved. 
  
 Any question please let us know. 
  
 Regards, 
  
 Don