[mapguide-users] Getting all object Enveloppe

Tue Jun 5 11:36:52 EDT 2007

zspitzer>
I'm using the Autodesk Mapguide Enterprise Server, si i can't use OS 1.2
beta (i liked to..)
And i have to use VB.net.. So no php..

Kenneth>
non-availability of modifying map or layout during the runtime. By Creating
a layout i can't use the refresh method in the viewer? I have to reload the
entire layout?
Re-writing a "zoom to map extent" functionnality was my first idea, i used a
command in the weblayout calling a custom ZoomExtent() javascript function.
I used a zoomToView() command but i had no idea on how to calculate the
scale with the dwf viewer (yeah, i have this constraint too..).
I think now that i can calculate the scale by using GetDisplayHeight
(),GetDisplayWidth () and 	GetDisplayDpi () MgMap's method (like the
"zoomSelection()" ajaxviewer's method do)

Harder is Better :p

zspitzer wrote:
> 
> the mapdefinition and weblayoutdefinition php classes are good for
> this. look at the schemareport in 1.20 betas for examples on how use
> them.
> 
> note there are two versions of this library in the release. which aint
> good, i am going to file a bug on that...one in schemareport, one in
> mapviewerphp and they are slightly different.
> 
> according to the docs they are only available in php
> 
> z
> 
> On 6/5/07, Kenneth, GEOGRAF A/S <ks at geograf.dk> wrote:
>>
>>  You are writing a map definition into the runtime map.
>>  That will not work.
>>
>>  I don't know why, but you can't change the initial view in the runtime
>> map,
>> using the MapGuide API.
>>  Perhaps someone else can explain why those properties are readonly?
>>
>>  Instead, you have to create a new MapDefinition (which is what you are
>> doing).
>>  The new MapDefinition must be saved, like you do, but with type
>> MgResourceType.MapDefinition.
>>
>>  Then you must create/copy a WebLayout, modify the MapDefinition of the
>> layout, and save the layout.
>>  Now you can start the browser, and point to the new WebLayout to display
>> your map.
>>
>>
>>
>>  I think you will have an easier time modifying the ajaxmappane.templ
>> file.
>>  It has a function called InitialMapView() which shows how the extent is
>> calculated.
>>  You might provide your own extension here that updates the orgExt
>> variables.
>>
>>  If you wan't it to work with an unmodified server, you have to update
>> these
>> variables some other way.
>>  If you wan't it to work with the DWF viewer, you have to use the
>> approach
>> outlined above.
>>
>>
>>  Regards. Kenneth, GEOGRAF A/S
>>
>>
>>  David Hequet wrote:
>>  Thank you, i wrote a method using my method (using au selection object).
>> I
>> will try to optimize it with your advice later. I'm curently busy with
>> the
>> "set the extent to the map in the session" part of my dev. Here is what i
>> did:
>>
>> 'infos:
>> 'me._map = map resource in the session
>> 'aMgEnveloppe = valid mgenveloppe of my data
>> 'me._sessionId = current mapguide session
>>
>> Dim aMgByteReader As MgByteReader
>> Dim aContent As String
>> Dim anXmlDoc As XmlDocument
>> Dim anXmlNode As XmlNode
>> Dim aRootNode As XmlNode
>>
>> ' lecture du contenu de definition de la carte pour retrouver le nom de
>> la
>> resource associée
>> aMgByteReader =
>> Me._resourceService.GetResourceContent(Me._map.GetMapDefinition())
>> aContent = aMgByteReader.ToString()
>> anXmlDoc = New XmlDocument()
>> anXmlDoc.LoadXml(aContent)
>>
>> aRootNode = anXmlDoc.DocumentElement
>> ' modification des etendues
>> anXmlNode = aRootNode.SelectSingleNode("Extents/MinX")
>> anXmlNode.ChildNodes(0).Value =
>> aMgEnveloppe.GetLowerLeftCoordinate.GetX
>> anXmlNode = aRootNode.SelectSingleNode("Extents/MinY")
>> anXmlNode.ChildNodes(0).Value =
>> aMgEnveloppe.GetLowerLeftCoordinate.GetY
>> anXmlNode = aRootNode.SelectSingleNode("Extents/MaxX")
>> anXmlNode.ChildNodes(0).Value =
>> aMgEnveloppe.GetUpperRightCoordinate.GetX
>> anXmlNode = aRootNode.SelectSingleNode("Extents/MaxY")
>> anXmlNode.ChildNodes(0).Value =
>> aMgEnveloppe.GetUpperRightCoordinate.GetY
>>
>> Dim anXmlStream As MemoryStream = New MemoryStream()
>>
>> anXmlDoc.Save(anXmlStream)
>> Dim aMapDefinition() As Byte = anXmlStream.ToArray()
>> Dim utf8 As Encoding = Encoding.UTF8
>> Dim aMapDefStr As String = New String(utf8.GetChars(aMapDefinition))
>> aMapDefinition = New Byte(aMapDefStr.Length - 1) {}
>> 'Dim byteCount As Integer = utf8.GetBytes(aMapDefStr, 1,
>> aMapDefStr.Length -
>> 1, aMapDefinition, 0)
>>
>> Dim aByteSource As MgByteSource = New MgByteSource(aMapDefinition,
>> aMapDefinition.Length())
>> aByteSource.SetMimeType(MgMimeType.Xml)
>>
>> Dim aMgByteReader2 As MgByteReader = aByteSource.GetReader()
>>
>> Dim mapStateId As MgResourceIdentifier = New
>> MgResourceIdentifier("Session:"
>> + Me._sessionId + "//" + Me._map.GetName() + "." + MgResourceType.Map)
>> Me._resourceService.SetResource(mapStateId, aMgByteReader,
>> Nothing)
>>
>> I don't have any error, but when i refresh the map or try a "zoom to
>> initial
>> view" nothing happen.
>> Maybe might i update the weblayout's initial view? (but scale calc
>> needed..)
>>
>> Anyone got an idea?
>> Thank you
>>
>>
>> Kenneth, GEOGRAF A/S wrote:
>>
>>
>>  You don't have to use the selection part.
>> You can extract the object directly from the feature reader.
>> Once you have the object, you can also get the extent (aka bbox).
>> If you then construct an envelope object, you can add the features
>> envelope to original envelope.
>>
>> Something like:
>>
>> create a new MgFeatureQueryOptions with an empty filter
>> create a new Envelope
>> For Each Layer
>> {
>>  Use a featureReader with the MgFeatureQueryOptions
>>  Add the feature's envelope to the outer Envelope
>> }
>> Get zoom extents from the Envelope
>>
>>
>> Other than this, I don't think you can optimize it anymore, as you need
>> to execute the query on each layer.
>>
>> I think there is a "Get Extents" on the feature source, but I can't find
>> it. And I don't think it works on filtered datasources.
>>
>> Perhaps you can execute the query with some SQL optimizations like
>> "Select Envelope(geometry) from datasource".
>>
>> Hope it helps.
>>
>> Regards, Kenneth, GEOGRAF A/S
>>
>>
>>
>> David Hequet wrote:
>>
>>
>>  Hello,
>>
>> I'm trying to make a fonction that can return me the enveloppe of the
>> entire
>> visible map (no way with original map extent).
>>
>> Explain: I have a map "template" with a lot of layers, i have a function
>> that change all the layer filter (basic filter, no spatial) to see
>> different
>> map based on that template. Doing that make the "zoom to original extent"
>> useless, because data are not on the same area.
>> I wan't to set the new map extent in the MapDefinition.
>> My ask is about getting the new extent.
>>
>> I thought to do it like that:
>>
>> create a new MgSelection
>> create a new MgFeatureQueryOptions with an empty filter
>> For Each Layer
>> {
>>  Use a featureReader with the MgFeatureQueryOptions
>>  Add the selected feature to the MgSelection
>> }
>> Getting the MgSelection enveloppe
>>
>> It will work, but i don't think it's very optimized with a lot of
>> Layer/Feature (and it will used at each map load, filter modification..)
>>
>> Did someone have a better way?
>>
>> Thank you!
>>
>> Ps: sorry for my poor english, ask i you want precision.
>>
>>
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>>
>>
>>
>>
>>
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>>
> 
> 
> -- 
> Zac Spitzer
> http://zacster.blogspot.com/
> +61 3 9018 5778 (voip via my pc)
> +61 405 847 168
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