MapRuler Class

Draws a ruler on the map.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v24.2.dll

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>, MapRulerStyle)
• 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 Ruler

Use the Measurements.CreateRuler method to add a ruler to the map. The following code displays a distance ruler on the map:

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 passed as a parameter.
RemovePoint(MapRuler, Int32)	Removes the point with the specified index.
UpdatePoint(MapRuler, CoordPoint, Int32)	Changes 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 Ruler

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

C#

mapControl1.Measurements.RemoveRuler(ruler);

VB.NET

mapControl1.Measurements.RemoveRuler(ruler)

If you need to delete all rulers from the map, call the RemoveRulers() method:

C#

mapControl1.Measurements.RemoveRulers();

VB.NET

mapControl1.Measurements.RemoveRulers()

Customize Ruler Appearance

Use the CreateRuler(RulerType, IList<CoordPoint>, MapRulerStyle) method to define the ruler’s appearance. The MapRulerStyle class contains ruler style options.

C#

MapRulerStyle style = new MapRulerStyle();
style.Stroke = Color.Red;
style.StrokeWidth = 3;
MapRuler ruler1 = mapControl1.Measurements.CreateRuler(RulerType.Distance, 
                                                      new List<CoordPoint>() {
                                                          new GeoPoint(51.2217200, 6.7761600), // Dusseldorf
                                                          new GeoPoint(52.520008, 13.404954),  // Berlin
                                                          new GeoPoint(48.20849, 16.37208)   // Vienna
                                                      }, style);

VB.NET

Dim style As MapRulerStyle = New MapRulerStyle()
style.Stroke = Color.Red
style.StrokeWidth = 3
Dim ruler1 As MapRuler = mapControl1.Measurements.CreateRuler(RulerType.Distance, New List(Of CoordPoint)() From {
                                                                                      New GeoPoint(51.2217200, 6.7761600), ' Dusseldorf
                                                                                      New GeoPoint(52.520008, 13.404954),  ' Berlin
                                                                                      New GeoPoint(48.20849, 16.37208)   ' Vienna
                                                                                  }, style)

Related API members:

Name	Description
CreateRuler(RulerType, IList<CoordPoint>, MapRulerStyle)	Creates a ruler with the specified style.
MapRulerStyle	Contains ruler style options.
Stroke	Gets or sets the ruler’s outline color.
StrokeWidth	Gets or sets the ruler’s outline width.

Inheritance

Object

MapRuler