MapRuler Class

Draws a ruler on the map.

Namespace: DevExpress.Xpf.Map

Assembly: DevExpress.Xpf.Map.v21.1.dll

NuGet Package: DevExpress.Wpf.Map

Declaration

C#

public class MapRuler :
    IMapRuler

VB.NET

Public Class MapRuler
    Implements IMapRuler

Related API Members

The following members return MapRuler objects:

• AfterMeasurementEventArgs.MapRuler
• AfterRulerRemovalEventArgs.Ruler
• BeforeRulerRemovalEventArgs.Ruler
• Measurements.CreateRuler(RulerType, IList<CoordPoint>, RulerAppearance)
• Measurements.CreateRuler(RulerType, IList<CoordPoint>)

Remarks

The Map Control uses rulers to measure distances and areas on a map. Two types of rulers are supported:

Distance Ruler	Area Ruler

Create Rulers

Use the CreateRuler(RulerType, IList<CoordPoint>) method to add a ruler to the map. The following code displays a distance ruler:

C#

MapRuler ruler = mapControl1.Measurements.CreateRuler(RulerType.Distance, 
                                                        new List<CoordPoint>(){
                                                           new GeoPoint(48.864716, 2.349014),   // Paris
                                                           new GeoPoint(45.46427, 9.18951),     // Milan
                                                           new GeoPoint(48.20849, 16.37208) }); // Vienna

VB.NET

Dim ruler As MapRuler = mapControl1.Measurements.CreateRuler(RulerType.Distance, 
                                                             New List(Of CoordPoint)() From {
                                                                New GeoPoint(48.864716, 2.349014),  ' Paris
                                                                New GeoPoint(45.46427, 9.18951),    ' Milan 
                                                                New GeoPoint(48.20849, 16.37208) }) ' Vienna

Configure Ruler Points

To modify a ruler, configure ruler points. You can use the following methods:

Name	Description
InsertPoint(MapRuler, CoordPoint, Int32)	Adds a new point to the ruler.
RemovePoint(MapRuler, Int32)	Removes the point with the specified index.
UpdatePoint(MapRuler, CoordPoint, Int32)	Changes the coordinates of the point with the specified index.

The example below creates a ruler to measure the distance between Paris, Milan and Vienna. After calculating this distance, the code updates the ruler as follows:

• a point is added at Berlin’s coordinates;
• the first point is moved from Paris to Dusseldorf;
• the point at Milan’s coordinates is removed from the ruler.

C#

MapRuler ruler = mapControl1.Measurements.CreateRuler(RulerType.Distance,
                                                        new List<CoordPoint>() {
                                                            new GeoPoint(48.864716, 2.349014), // Paris
                                                            new GeoPoint(45.46427, 9.18951),   // Milan
                                                            new GeoPoint(48.20849, 16.37208)   // Vienna
                                                        });
//The code below updates the ruler.                                                        
mapControl1.Measurements.InsertPoint(ruler, new GeoPoint(52.520008, 13.404954), 2); // Berlin
mapControl1.Measurements.UpdatePoint(ruler, new GeoPoint(51.2217200, 6.7761600), 0); // Dusseldorf
mapControl1.Measurements.RemovePoint(ruler, 1); // Milan

VB.NET

Dim ruler As MapRuler = mapControl1.Measurements.CreateRuler(RulerType.Distance, 
                                                             New List(Of CoordPoint)() From {
                                                                New GeoPoint(48.864716, 2.349014),' Paris
                                                                New GeoPoint(45.46427, 9.18951),  ' Milan
                                                                New GeoPoint(48.20849, 16.37208)  ' Vienna })

'The code below updates the ruler.                                                        
mapControl1.Measurements.InsertPoint(ruler, New GeoPoint(52.520008, 13.404954), 2) ' Berlin
mapControl1.Measurements.UpdatePoint(ruler, New GeoPoint(51.2217200, 6.7761600), 0) ' Dusseldorf
mapControl1.Measurements.RemovePoint(ruler, 1) ' Milan

Before Update	After Update

Remove Rulers

The RemoveRuler(MapRuler) method removes the ruler passed as a parameter.

C#

mapControl1.Measurements.RemoveRuler(ruler);

VB.NET

mapControl1.Measurements.RemoveRuler(ruler)

To delete all rulers from the map, call the RemoveRulers() method.

C#

mapControl1.Measurements.RemoveRulers();

VB.NET

mapControl1.Measurements.RemoveRulers()

Inheritance

Object

MapRuler