# MultiPolygon and RadMap

6 posts, 1 answers
1. ##### Nick Anagnostopoulos
3 posts
Member since:
Jul 2009

Posted 07 Jun 2010 Link to this post

I am writing an application similar to the Sales Dashboard example. In the example,  only simple polygons are being displayed, is it possible to use MultiPolygons with the RadMap?
2. ##### Andrey
1681 posts

Posted 09 Jun 2010 Link to this post

Hello Nick Anagnostopoulos,

Yes, this can be done. There are several ways to achieve such behavior. The map shapes operate similar to the standard Silverlight geometries, but use geographical locations as figure points' coordinates. For example, the following code snippets add multi-polygon to the information layer. The first one use MapPolygon and the second one use MapPath for this purposes:

`LocationCollection points = ``new` `LocationCollection(); `
`// Outer polygon `
`points.Add(``new` `Location(42, -122)); `
`points.Add(``new` `Location(42, -121.5)); `
`points.Add(``new` `Location(41.5, -121.5)); `
`points.Add(``new` `Location(41.5, -122)); `
`points.Add(``new` `Location(42, -122)); `
` `
`// Inner polygon `
`points.Add(``new` `Location(41.9, -121.9)); `
`points.Add(``new` `Location(41.9, -121.6)); `
`points.Add(``new` `Location(41.6, -121.6)); `
`points.Add(``new` `Location(41.6, -121.9)); `
`points.Add(``new` `Location(41.9, -121.9)); `
` `
`MapPolygon polygon = ``new` `MapPolygon() `
`{ `
`    ``Fill = ``new` `SolidColorBrush(Colors.Red), `
`    ``Points = points `
`}; `
`this``.informationLayer.Items.Add(polygon); `

`MapPathFigure figure = ``new` `MapPathFigure(); `
` `
`// Outer polygon `
`LocationCollection points = ``new` `LocationCollection(); `
`points.Add(``new` `Location(42, -122)); `
`points.Add(``new` `Location(42, -121.5)); `
`points.Add(``new` `Location(41.5, -121.5)); `
`points.Add(``new` `Location(41.5, -122)); `
`points.Add(``new` `Location(42, -122)); `
` `
`MapPolyLineSegment polyline = ``new` `MapPolyLineSegment(); `
`polyline.Points = points; `
` `
`figure.StartPoint = points[0]; `
`figure.Segments.Add(polyline); `
` `
`// Inner polygon `
`points = ``new` `LocationCollection(); `
`points.Add(``new` `Location(41.9, -121.9)); `
`points.Add(``new` `Location(41.9, -121.6)); `
`points.Add(``new` `Location(41.6, -121.6)); `
`points.Add(``new` `Location(41.6, -121.9)); `
`points.Add(``new` `Location(41.9, -121.9)); `
` `
`polyline = ``new` `MapPolyLineSegment(); `
`polyline.Points = points; `
`figure.Segments.Add(polyline); `
` `
`MapPathGeometry geometry = ``new` `MapPathGeometry(); `
`geometry.FillRule = FillRule.EvenOdd; `
`geometry.Figures.Add(figure); `
` `
`MapPath path = ``new` `MapPath() `
`{ `
`    ``Fill = ``new` `SolidColorBrush(Colors.Green), `
`    ``Data = geometry `
`}; `
` `
`this``.informationLayer.Items.Add(path); `

The first approach is the easiest, but second one is more flexible.

Regards,
Andrey Murzov
the Telerik team

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3. ##### Nick Anagnostopoulos
3 posts
Member since:
Jul 2009

Posted 28 Jun 2010 Link to this post

Is it also possible to to put a label over the top of the shapes?

I am displaying zipcodes on the RadMap and i cant figure out how to add a label over the top of the shapes so the user can identify the zipcodes.
4. ##### Andrey
1681 posts

Posted 29 Jun 2010 Link to this post

Hi Nick Anagnostopoulos,

You can add any FrameworkElement to the information layer and position it geographically. For example:

`// Create grid with text block `
`Grid grid = ``new` `Grid(); `
`grid.Background = ``new` `SolidColorBrush(Colors.White); `
`TextBlock text = ``new` `TextBlock(); `
`text.Foreground = ``new` `SolidColorBrush(Colors.Red); `
`text.Text = ``"94546"``; `
`grid.Children.Add(text); `
` `
`// Set grid geographical location. `
`MapLayer.SetLocation(grid, ``new` `Location(42, -122)); `
` `
`// Add grid to information layer `
`this``.informationLayer.Items.Add(grid); `

Regards,
Andrey Murzov
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items
5. ##### Nick Anagnostopoulos
3 posts
Member since:
Jul 2009

Posted 30 Jun 2010 Link to this post

Andrey, thank you very much for your help. i have been able to add multipolygons to the map, but when adding multipolygons or polygons with multiple interior polygons or "holes", the shapes are skewed.

Is it possible to create a multipolygon or polygon with more than one interior ring or "hole'?

Attached is a screenshot of the RadMap displaying the polygons and the spatial results from SQL Management Studio side by side.

Below is a Multipolygon that is not loading correctly and the code i am using to load Polygons and Multipolygons:

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Public Function WKTToMapShape(ByVal poly As String, ByVal color As System.Windows.Media.Brush, ByVal border As System.Windows.Media.Brush) As List(Of Object)
Dim wktType = poly.Substring(0, poly.IndexOf(" ("))
Dim PolygonList As New List(Of Object)
Select Case wktType.ToUpper

Case "POLYGON"

Dim WKT = poly
WKT = WKT.Replace(")), ((", ")):((")
WKT = WKT.Replace("), (", ");(")
WKT = Replace(WKT, "POLYGON ((", "((")
Dim figure As New MapPathFigure
Dim geometry As New MapPathGeometry
Dim path As New MapPath
Dim PointArray() As String
Dim points As New LocationCollection
Dim i As Integer = 0

If WKT.Contains(");(") = True Then
Dim rings = Split(WKT, ";")
For Each ring In rings
Dim r = ring
r = r.Replace("(", "")
r = r.Replace(")", "")

PointArray = Split(r, ",")
points = New LocationCollection
For Each pnt In PointArray
Dim Coords() = Split(Trim(pnt), " ")
Dim longitude = CType(Coords(0), Double)
Dim latitude = CType(Coords(1), Double)
Next
Dim polyline As New MapPolyLineSegment
polyline.Points = points
If i = 0 Then
figure.StartPoint = points(0)
i = i + 1
End If
Next
geometry = New MapPathGeometry
geometry.FillRule = FillRule.EvenOdd
path = New MapPath With {.Fill = color, .Stroke = border, .StrokeThickness = 2, .Data = geometry}
Else 'If Polygon does not have interior rings
Dim r = WKT
r = r.Replace("(", "")
r = r.Replace(")", "")

PointArray = Split(r, ",")
points = New LocationCollection
For Each pnt In PointArray
Dim Coords() = Split(Trim(pnt), " ")
Dim longitude = CType(Coords(0), Double)
Dim latitude = CType(Coords(1), Double)
Next
Dim polyline As New MapPolyLineSegment
polyline.Points = points

figure.StartPoint = points(0)

geometry = New MapPathGeometry
geometry.FillRule = FillRule.EvenOdd
path = New MapPath With {.Fill = color, .Stroke = border, .StrokeThickness = 2, .Data = geometry}
End If

Case "MULTIPOLYGON"
'Manipulate String to make it easier to split apart and indentify
Dim WKT = poly

WKT = WKT.Replace(")), ((", ")):((")
WKT = WKT.Replace("), (", ");(")
WKT = Replace(WKT, "MULTIPOLYGON (((", "((")
WKT = Replace(WKT, ")))", "))")
'Create an array of each polygon
Dim PolyArray() As String = Split(WKT, ":")

For Each ply In PolyArray
Dim figure As New MapPathFigure
Dim geometry As New MapPathGeometry
Dim path As New MapPath
Dim i As Integer = 0

'If polygon has interior rings
If ply.Contains(");(") = True Then
Dim rings = Split(ply, ";")

For Each ring In rings
Dim r = ring
r = r.Replace("(", "")
r = r.Replace(")", "")
Dim PointArray() As String = Split(r, ",")
Dim points As New LocationCollection
For Each pnt In PointArray
Dim Coords() = Split(Trim(pnt), " ")
Dim longitude = CType(Coords(0), Double)
Dim latitude = CType(Coords(1), Double)
Next
Dim polyline As New MapPolyLineSegment
polyline.Points = points
If i = 0 Then
figure.StartPoint = points(0)
i = i + 1
End If

Next

geometry = New MapPathGeometry
geometry.FillRule = FillRule.Nonzero
path = New MapPath With {.Fill = color, .Stroke = border, .StrokeThickness = 2, .Data = geometry}
'path = New MapPath With {.Fill = color, .Data = geometry}
Else 'If Polygon does not have interior rings
Dim r = ply
r = r.Replace("(", "")
r = r.Replace(")", "")
Dim PointArray() As String = Split(r, ",")
Dim points As New LocationCollection
For Each pnt In PointArray
Dim Coords() = Split(Trim(pnt), " ")
Dim longitude = CType(Coords(0), Double)
Dim latitude = CType(Coords(1), Double)
Next
Dim polyline As New MapPolyLineSegment
polyline.Points = points
figure.StartPoint = points(0)
geometry = New MapPathGeometry
geometry.FillRule = FillRule.EvenOdd
path = New MapPath With {.Fill = color, .Stroke = border, .StrokeThickness = 1, .Data = geometry}
End If
Next
Case Else
Throw New NotImplementedException
End Select
Return PolygonList
End Function

##### Andrey
1681 posts

Posted 30 Jun 2010 Link to this post

Hello Nick Anagnostopoulos,

Yes, it's possible to create a multipolygon or polygon with more than one interior ring.
If the polygon has interior rings, then the logic of the figures creation should create each polygon as separate figure. The sample code is the following:
`geometry = ``New` `MapPathGeometry `
`geometry.FillRule = FillRule.EvenOdd `
``` For``` `Each` `ring ``In` `rings `
`    ``figure = ``New` `MapPathFigure `
`    ``Dim` `r = ring `
`    ``r = r.Replace(``"("``, ``""``) `
`    ``r = r.Replace(``")"``, ``""``) `
`    ``Dim` `PointArray() ``As` `String` `= Split(r, ``","``) `
`    ``Dim` `points ``As` `New` `LocationCollection `
```     ````For` `Each` `pnt ``In` `PointArray `
`        ``Dim` `Coords() = Split(Trim(pnt), ``" "``) `
`        ``Dim` `longitude = ``CType``(Coords(0), ``Double``) `
`        ``Dim` `latitude = ``CType``(Coords(1), ``Double``) `
`        ``points.Add(``New` `Location(latitude, longitude)) `
`    ``Next`
```     ````Dim` `polyline ``As` `New` `MapPolyLineSegment `
`    ``polyline.Points = points `
`    ``figure.StartPoint = points(0) `
`    ``figure.Segments.Add(polyline) `
```     ````geometry.Figures.Add(figure) `
`Next`
``` path = ````New` `MapPath ``With` `{.Fill = color, .Stroke = border, .StrokeThickness = 2, .Data = geometry} `
`PolygonList.Add(path) `

All the best,
Andrey Murzov
the Telerik team
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