Rank 1
5 Answers, 1 is accepted
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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Rank 1
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.
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
Rank 1
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)
points.Add(New Location(latitude, longitude))
Next
Dim polyline As New MapPolyLineSegment
polyline.Points = points
If i = 0 Then
figure.StartPoint = points(0)
i = i + 1
End If
figure.Segments.Add(polyline)
Next
geometry = New MapPathGeometry
geometry.FillRule = FillRule.EvenOdd
geometry.Figures.Add(figure)
path = New MapPath With {.Fill = color, .Stroke = border, .StrokeThickness = 2, .Data = geometry}
PolygonList.Add(path)
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)
points.Add(New Location(latitude, longitude))
Next
Dim polyline As New MapPolyLineSegment
polyline.Points = points
figure.StartPoint = points(0)
figure.Segments.Add(polyline)
geometry = New MapPathGeometry
geometry.FillRule = FillRule.EvenOdd
geometry.Figures.Add(figure)
path = New MapPath With {.Fill = color, .Stroke = border, .StrokeThickness = 2, .Data = geometry}
PolygonList.Add(path)
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)
points.Add(New Location(latitude, longitude))
Next
Dim polyline As New MapPolyLineSegment
polyline.Points = points
If i = 0 Then
figure.StartPoint = points(0)
i = i + 1
End If
figure.Segments.Add(polyline)
Next
geometry = New MapPathGeometry
geometry.FillRule = FillRule.Nonzero
geometry.Figures.Add(figure)
path = New MapPath With {.Fill = color, .Stroke = border, .StrokeThickness = 2, .Data = geometry}
'path = New MapPath With {.Fill = color, .Data = geometry}
PolygonList.Add(path)
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)
points.Add(New Location(latitude, longitude))
Next
Dim polyline As New MapPolyLineSegment
polyline.Points = points
figure.StartPoint = points(0)
figure.Segments.Add(polyline)
geometry = New MapPathGeometry
geometry.FillRule = FillRule.EvenOdd
geometry.Figures.Add(figure)
path = New MapPath With {.Fill = color, .Stroke = border, .StrokeThickness = 1, .Data = geometry}
PolygonList.Add(path)
End If
Next
Case Else
Throw New NotImplementedException
End Select
Return PolygonList
End Function
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
ForEach 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