centre the map with all feature collection

[JulieBiju]

Dears,
In my map i am adding lot of graphics in a buttonclick.For Eg: When i click button 5 graphics with different long and lat is adding on map.Some times graphics collection is more than 5 ...Now i need to position my map based on this graphics.Now i can ee the graphics after i drag the map.when i click button i need the display of map with all added graphics and zoom should adjust accordingly.

<esri:Map   Grid.Row="3"   Extent="-120, 20, -100, 40" Name="MyMap" Visibility="Visible" Background="Transparent" Margin="2,0" BorderThickness="1" BorderBrush="{StaticResource TitleBarGradient}">           <esri:ArcGISTiledMapServiceLayer ID="StreetMapLayer" Url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer" />             <esri:GraphicsLayer ID="MyGraphicsLayer">                 <esri:GraphicsLayer.MapTip>                     <StackPanel Orientation="Vertical" Margin="10,10,10,10">                         <TextBlock Text="{Binding [Name]}"  Width="120" Height="20" TextAlignment="Center"                            FontWeight="SemiBold"/>                                            </StackPanel>                 </esri:GraphicsLayer.MapTip>             </esri:GraphicsLayer>         </esri:Map>  

.

   For recordcount = 0 To e.Result.Count - 1             'Dim geometry1 As New Point(csys, rsOman("lon"), rsOman("lat"))             Dim Status As String = ""             Dim EventId As Integer             Dim colourstyle As String             EventId = e.Result(recordcount).EEventID             If EventId = 253 Then                 colourstyle = "GlobePictureSymbol_Blue"             ElseIf EventId = 110 Then                 colourstyle = "GlobePictureSymbol_Green"             ElseIf EventId = 108 Then                 colourstyle = "GlobePictureSymbol_Green"             ElseIf EventId = 101 Then                 colourstyle = "GlobePictureSymbol_Red"             ElseIf EventId = 142 Then                 colourstyle = "GlobePictureSymbol_Black"             ElseIf EventId = 254 Then                 colourstyle = "GlobePictureSymbol_Gray"             Else                 colourstyle = "GlobePictureSymbol_Black"             End If             Status = e.Result(recordcount).EEventName              '*************************             ''''''''''LOCATION FROM POI and Roaddata same connection not possible bfre close              Dim procname As String = ""             Dim location As String             location = ""             If e.Result(recordcount).EStreetAddress <> "NULL" And e.Result(recordcount).EStreetAddress <> "" Then                 location = e.Result(recordcount).ELocationName & ", STREET: " & e.Result(recordcount).EStreetAddress             Else                 location = e.Result(recordcount).ELocationName & ""             End If             ''''''''''''''''''''''''''             TxtLastUpd.Text = e.Result(recordcount).Edatedisplay             Dim gpsNMEASentences As String = "$GPGGA,92204.9, " & e.Result(recordcount).ELat & ", N," & e.Result(recordcount).ELon & ", W, 1, 04, 2.4, 25.7, M,,,,*75"              Dim gpsNMEASentenceArray() As String = gpsNMEASentences.Split(ControlChars.Lf)              Dim gpsNMEASentence() As String = gpsNMEASentenceArray(0).Split(","c)                         Dim graphic As New Graphic() With                 {                     .Geometry = mercator.FromGeographic(New MapPoint(Convert.ToDouble(gpsNMEASentence(4)), Convert.ToDouble(gpsNMEASentence(2)))),                     .Symbol = TryCast(LayoutRoot.Resources(colourstyle), Symbol)                 }             Dim graphicsLayer As GraphicsLayer = TryCast(MyMap.Layers("MyGraphicsLayer"), GraphicsLayer)             graphicsLayer.Graphics.Clear()             graphicsLayer.Graphics.Add(graphic)              esriLogoImage.Visibility = Windows.Visibility.Collapsed             MyMap.Visibility = Windows.Visibility.Visible             MyMap.ZoomTo(graphicsLayer.FullExtent)          Next

[DominiqueBroux]

.Geometry = mercator.FromGeographic(New MapPoint(Convert.ToDouble(gpsNMEASentence(4)), Convert.ToDouble(gpsNMEASentence(2)))),

You map seems to be in Geographical coodinates (as http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer).

So you should not convert the graphic coordinates to web mercator.
Due to that,  a conversion back to geographical coordinates is done asynchronously and then your ZoomTo code : MyMap.ZoomTo(graphicsLayer.FullExtent) is not working synchronously.

[JulieBiju]

Dear friend,
I tried the way what u mentioned.I am getting FullExtent is nothing.Map is not showing properly also.I pasted my code below.Can u tell me where i am wrong.If i will not add MyMap.ZoomTo(graphicsLayer.FullExtent) then i can see map then i need to drag for viewing the graphics.

        <esri:Map Extent="-120, 20, -100, 40"  Grid.Row="3" Name="MyMap"  Visibility="Visible" Background="Transparent" Margin="2,0" BorderThickness="1" BorderBrush="{StaticResource TitleBarGradient}">
          <esri:ArcGISTiledMapServiceLayer ID="StreetMapLayer" Url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer" />
          <esri:GraphicsLayer ID="MyGraphicsLayer" />
        </esri:Map>

ButtonClick code

 Dim gpsNMEASentences As String = "$GPGGA, 92204.9, " & e.Result(Loopcnt).ETLat & ", N," & e.Result(Loopcnt).ETLon & ", W, 1, 04, 2.4, 25.7, M,,,,*75"
            Dim gpsNMEASentenceArray() As String = gpsNMEASentences.Split(ControlChars.Lf)
            Dim gpsNMEASentence() As String = gpsNMEASentenceArray(0).Split(","c)
            ''.Geometry = mercator.FromGeographic(New MapPoint(Convert.ToDouble(gpsNMEASentence(4)), Convert.ToDouble(gpsNMEASentence(2)))),
            Dim graphic As New Graphic() With
                {
                    .Geometry = New MapPoint(Convert.ToDouble(gpsNMEASentence(4)), Convert.ToDouble(gpsNMEASentence(2))),
                    .Symbol = TryCast(LayoutRoot.Resources(colourstyle), Symbol)
                }
            Dim strhotspot As String = ""
            strhotspot = "VEHICLE: " & Trim(TryCast(CmbFahrname.SelectedItem, comboloadclass).ename.ToString()) & ", DATETIME: " & e.Result(Loopcnt).ETdatedisplay & ", LOCATION: " & e.Result(Loopcnt).ETLocationName & ", SPEED: " & e.Result(Loopcnt).ETspeed & ", STATUS: " & Status
            graphic.Attributes.Add("STRHOTSPOT", strhotspot)
            AddHandler graphic.MouseLeave, AddressOf Graphic_MouseLeave
            AddHandler graphic.MouseEnter, AddressOf Graphic_MouseEnter

            'Delete the existing find object and add the new one
            If (Not MyMap Is Nothing) Then
                If recordcount = 1 Then
                    If (EventId1 = 12 And EventId2 = 14) Then ''excluding vehicle idle after journey end
                    Else
                        graphicsLayer.Graphics.Add(graphic)
                    End If
                Else
                    If (EventId1 = 12 And EventId2 = 14) Then ''excluding vehicle idle after journey end
                    Else
                        graphicsLayer.Graphics.Add(graphic)
                    End If
                End If
                ''adding lines''''''''''''''''''
                If recordcount > 1 Then
                    Dim startPoint As New MapPoint(Startlong, Startlat)
                    Dim endPoint As New MapPoint(Endlong, Endlat)
                    Dim pointCollection As New ESRI.ArcGIS.Client.Geometry.PointCollection()
                    pointCollection.Add(startPoint)
                    pointCollection.Add(endPoint)
                    Dim polyline As New ESRI.ArcGIS.Client.Geometry.Polyline()
                    polyline.Paths.Add(pointCollection)
                    Dim graphicLine As New Graphic() With
                {
                    .Symbol = TryCast(LayoutRoot.Resources("DefaultLineSymbol"), Symbol),
                    .Geometry = mercator.FromGeographic(polyline)
                }
                    If (EventId1 = 12 And EventId2 = 14) Then
                    Else
                        graphicsLayer.Graphics.Add(graphicLine)
                    End If
                End If

                MyMap.ZoomTo(graphicsLayer.FullExtent)

[DominiqueBroux]

Try by initializing the Spatial reference of your graphics.
Something like:

                    .Geometry = New MapPoint(Convert.ToDouble(gpsNMEASentence(4)), Convert.ToDouble(gpsNMEASentence(2)), New SpatialReference(4326)),

Also you have still a web mercator conversion:

                    .Geometry = mercator.FromGeographic(polyline)

Try without it.

[JulieBiju]

                    .Geometry = New MapPoint(Convert.ToDouble(gpsNMEASentence(4)), Convert.ToDouble(gpsNMEASentence(2)), New SpatialReference(4326)),

But i am getting mapdata not available screen.See the screenshot attached here with.My coding is like as follows
[ATTACH=CONFIG]15085[/ATTACH]

 Dim gpsNMEASentences As String = "$GPGGA, 92204.9, " & e.Result(Loopcnt).ETLat & ", N," & e.Result(Loopcnt).ETLon & ", W, 1, 04, 2.4, 25.7, M,,,,*75"
            Dim gpsNMEASentenceArray() As String = gpsNMEASentences.Split(ControlChars.Lf)
            Dim gpsNMEASentence() As String = gpsNMEASentenceArray(0).Split(","c)
            ''.Geometry = mercator.FromGeographic(New MapPoint(Convert.ToDouble(gpsNMEASentence(4)), Convert.ToDouble(gpsNMEASentence(2)))),
            Dim graphic As New Graphic() With
                {
                    .Geometry = New MapPoint(Convert.ToDouble(gpsNMEASentence(4)), Convert.ToDouble(gpsNMEASentence(2)), New SpatialReference(4326)),
                    .Symbol = TryCast(LayoutRoot.Resources(colourstyle), Symbol)
                }
            Dim strhotspot As String = ""
            strhotspot = "VEHICLE: " & Trim(TryCast(CmbFahrname.SelectedItem, comboloadclass).ename.ToString()) & ", DATETIME: " & e.Result(Loopcnt).ETdatedisplay & ", LOCATION: " & e.Result(Loopcnt).ETLocationName & ", SPEED: " & e.Result(Loopcnt).ETspeed & ", STATUS: " & Status
            graphic.Attributes.Add("STRHOTSPOT", strhotspot)
            AddHandler graphic.MouseLeave, AddressOf Graphic_MouseLeave
            AddHandler graphic.MouseEnter, AddressOf Graphic_MouseEnter

            'Delete the existing find object and add the new one
            If (Not MyMap Is Nothing) Then
                If recordcount = 1 Then
                    If (EventId1 = 12 And EventId2 = 14) Then ''excluding vehicle idle after journey end
                    Else
                        graphicsLayer.Graphics.Add(graphic)
                    End If
                Else
                    If (EventId1 = 12 And EventId2 = 14) Then ''excluding vehicle idle after journey end
                    Else
                        graphicsLayer.Graphics.Add(graphic)
                    End If
                End If
                ''adding lines''''''''''''''''''
                If recordcount > 1 Then
                    Dim startPoint As New MapPoint(Startlong, Startlat)
                    Dim endPoint As New MapPoint(Endlong, Endlat)
                    Dim pointCollection As New ESRI.ArcGIS.Client.Geometry.PointCollection()
                    pointCollection.Add(startPoint)
                    pointCollection.Add(endPoint)
                    Dim polyline As New ESRI.ArcGIS.Client.Geometry.Polyline()
                    polyline.Paths.Add(pointCollection)
                    Dim graphicLine As New Graphic() With
                {
                    .Symbol = TryCast(LayoutRoot.Resources("arrowLineSymbol"), Symbol),
                    .Geometry = polyline
                }
                    If (EventId1 = 12 And EventId2 = 14) Then ''excluding vehicle idle after journey end
                    Else
                        graphicsLayer.Graphics.Add(graphicLine)
                    End If
                End If

                If recordcount = 1 Then

                Else
                    Startlong = e.Result(Loopcnt).ETLon
                    Startlat = e.Result(Loopcnt).ETLat
                End If
                '''''''''''''''''''''''''''''''
                esriLogoImage.Visibility = Windows.Visibility.Collapsed
                MyMap.Visibility = Windows.Visibility.Visible

            End If

            txtEndLong.Text = e.Result(Loopcnt).ETLon
            TxtEndLat.Text = e.Result(Loopcnt).ETLat
            recordcount = recordcount + 1
        Next

        If datastat = False Then
            MessageBox.Show("NO DATA,Pls Try Again....")
        Else
            MyMap.ZoomTo(graphicsLayer.FullExtent)
        End If

[DominiqueBroux]

But i am getting mapdata not available screen

I guess it's working well if you zoom out. Isn't it?

Are your graphics at the right location? (else there is a Spatial Reference mismatch somewhere).

[JulieBiju]

I guess it's working well if you zoom out. Isn't it?

Are your graphics at the right location? (else there is a Spatial Reference mismatch somewhere).

Yes if i zoom out i can see the points on map...The clients needs to click button then need to zoom out then only they can see the map...How can i avoid this situation???

[DominiqueBroux]

Yes if i zoom out i can see the points on map...The clients needs to click button then need to zoom out then only they can see the map...How can i avoid this situation???

I guess it's because your graphcis are too close and so your full extent is too small. You can expand it to reach a minimal size.

[JulieBiju]

I guess it's because your graphcis are too close and so your full extent is too small. You can expand it to reach a minimal size.

What u said is correct..Almost all locations are very closer....How can i expand to reach a minimal size???

[JoeHershman · Accepted solution]

What u said is correct..Almost all locations are very closer....How can i expand to reach a minimal size???

Map has a MinimumResolution property that defines the lowest resolution that can be zoomed to

-Joe