[mapguide-users] Adding a point to a map... PLZ Help!!! (.NET -C#)
Kenneth Skovhede, GEOGRAF A/S
ks at geograf.dk
Thu Oct 16 05:07:55 EDT 2008
I still can't tell which of the two scenarios you are aiming at.
So you have a highway, and some points on the highway.
I'm thinking that the points should be created before the user starts to
do anything.
Does it make sense to convert the data into a database with X and Y
columns, before even thinking about what MapGuide does?
You can make a little batch job that updates the database if you prefer,
still without use of MapGuide.
Once you have such a database, set it up in Studio or Maestro like a
regular layer.
Add the layer to the map, but make it invisible if you only want to show
it in some cases.
Now, during runtime, you can create a copy of the LayerDefinition, and
insert a "filter" on the layer.
This will allow you to control what points a specific user sees.
Now save this copy of the LayerDefinition to the Session store.
The update the layer in the runtime map to point to the Session based
LayerDefinition, and set the layer visible.
Now save the runtime map, and issue a refresh on the client.
I can't tell from your code fragments what goes wrong, but there is no
map.Save(...) call present, which is
how you would save the changes to the map. There is no
"getMap().Refresh()" call present, which must be issued
on the client in Javascript.
Regards, Kenneth Skovhede, GEOGRAF A/S
Galois skrev:
> You are wright about the confusion...
>
> Anyway, the scenario is the following:
>
> I have a map with the Highway of two Italian Cities.
> Firstly, I would like to display some points of interest on that map.
> Those points I have them in an XML file.
>
> So, my problem till now, is that I add a new layer on my map ( I see in
> debug mode that my map's Layers has increased ) but this layer doesn't
> appear in the page.
> If I solve this thing I'll try to add the points to this layer.
> Also, keep in mind that these points of interest, there might be static or
> not.
> This means that there is no point to create all this from Autodesk
> manually...
>
> Thank you (both) for the help!
>
>
>
>
>
> Kenneth Skovhede, GEOGRAF A/S wrote:
>
>> I agree with Maksim, there seems to be some confusion as to what you
>> want to do.
>> There are two basic scenarios:
>>
>> 1. You want to display some points based on context.
>> An example would be searching for hotels in a certain price interval,
>> and the opening a map with the hotels shown.
>>
>> 2. You want to display a number of points, but the data changes more or
>> less frequently.
>> An example of this would be position of vehicles.
>>
>> A combination would be to show the position of vehicles that are using
>> diesel engines.
>>
>> Could you elaborate on what your scenario is like?
>>
>> Regards, Kenneth Skovhede, GEOGRAF A/S
>>
>>
>>
>> Maksim Sestic skrev:
>>
>>> Hmm, if you're attending to batch-process large number of points (along
>>> with
>>> attached data) then web service calling FDO directly will do it much more
>>> efficiently, since you can preset it on server side to poke exact
>>> datastore/schema (thus skipping enumeration). Especially if you're
>>> planning
>>> to parse some client-side file holding actual information. Other way
>>> round
>>> you'll be making too many client-server roundtrips.Of couse, it all
>>> depends
>>> on the overall setup...
>>>
>>> -----Original Message-----
>>> From: mapguide-users-bounces at lists.osgeo.org
>>> [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Galois
>>> Sent: Wednesday, October 15, 2008 16:29
>>> To: mapguide-users at lists.osgeo.org
>>> Subject: RE: [mapguide-users] Adding a point to a map... PLZ Help!!!
>>> (.NET
>>> -C#)
>>>
>>>
>>> This is not a solution, cause at the feature, I'll have lot of XML files
>>> and
>>> the code will have to work in order to put all the interest points
>>> automatic
>>> on the map....
>>>
>>> ThanX anyway :-D
>>>
>>>
>>>
>>> Maksim Sestic wrote:
>>>
>>>
>>>> If the MG->Datastore approach is making you headaches, why don't you
>>>> directly access the datastore (i.e. via FDO if it's managed after all)
>>>> and store the point there "manually"? Of course, if you're poking it
>>>> from a client you'll have to establish a web service to do the job on
>>>> the server side. And don't forget to call MG refresh method from
>>>> JavaScript once you have that point within a datastore.
>>>>
>>>> Regards,
>>>> Maksim Sestic
>>>>
>>>> -----Original Message-----
>>>> From: mapguide-users-bounces at lists.osgeo.org
>>>> [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Galois
>>>> Sent: Wednesday, October 15, 2008 16:15
>>>> To: mapguide-users at lists.osgeo.org
>>>> Subject: Re: [mapguide-users] Adding a point to a map... PLZ Help!!!
>>>> (.NET
>>>> -C#)
>>>>
>>>>
>>>> Maybe I'm stupid....
>>>>
>>>> I cannot do it work. I have reconstruct the whole thing, but the new
>>>> Layer doesn't appear in the page.
>>>>
>>>> I followed the Dev's Guide in order to create a Layer and add it in
>>>> the map but nothing.
>>>>
>>>> Basically, I added these three functions. I really would appreciate if
>>>> u could give me some help..
>>>>
>>>>
>>>> public MgLayer addLayerRsc2Map(MgResourceIdentifier layerResId,
>>>> MgResourceService resourceSrvc, string layerName, string
>>>> layerLegendLabel, MgMap map)
>>>> {
>>>> //MgLayer newLayer = new MgLayer(layerResId, resourceSrvc);
>>>> MgLayer newLayer = new MgLayer(layerResId , resourceSrvc);
>>>>
>>>> //Add the new layer to the map's layer collection
>>>> newLayer.SetName(layerName);
>>>> newLayer.SetVisible(true);
>>>> newLayer.SetLegendLabel(layerLegendLabel);
>>>> newLayer.SetDisplayInLegend(true);
>>>> MgLayerCollection layerCollection = map.GetLayers();
>>>> if( !layerCollection.Contains(layerName) )
>>>> {
>>>> //Insert the new layer to position 0 so it is at
>>>> //the top of the drawing order
>>>> layerCollection.Insert(0,newLayer);
>>>> }
>>>> MgLayerGroupCollection skata = map.GetLayerGroups();
>>>> return newLayer;
>>>> }
>>>>
>>>>
>>>> public MgLayer addLayerDef2Map(string layerDefinition, string
>>>> layerName, string layerLegendLabel, string sessionId,
>>>> MgResourceService resourceSrvc, MgMap map )
>>>> {
>>>> // Adds the layer definition (XML) to the map.
>>>> // Returns the layer.
>>>>
>>>> //Validate the XML.
>>>> XmlDocument domDocument = new XmlDocument();
>>>> domDocument.LoadXml(layerDefinition);
>>>> domDocument.PreserveWhitespace = true;
>>>> MemoryStream stream = new System.IO.MemoryStream();
>>>> domDocument.Save(stream);
>>>>
>>>> Byte[] byteArray = stream.ToArray();
>>>> string outerXml =
>>>> System.Text.Encoding.UTF8.GetString(byteArray,
>>>> 0,
>>>> byteArray.Length);
>>>> byteArray = System.Text.Encoding.UTF8.GetBytes(outerXml);
>>>>
>>>> //Save the new layer definition to the Session.
>>>> MgByteSource byteSource = new MgByteSource(byteArray ,
>>>> byteArray.Length);
>>>> byteSource.SetMimeType(MgMimeType.Xml);
>>>> MgResourceIdentifier resourseId = new
>>>> MgResourceIdentifier("Session:" + map.SessionId + "//" + layerName +
>>>> "." + MgResourceType.LayerDefinition);
>>>>
>>>> // Set the map with the new resource
>>>> resourceSrvc.SetResource(resourseId, byteSource.GetReader(),
>>>> null);
>>>>
>>>>
>>>> MgLayer newLayer = addLayerRsc2Map(resourseId, resourceSrvc,
>>>> layerName, layerLegendLabel, map);
>>>> return newLayer;
>>>> }
>>>>
>>>>
>>>>
>>>> public void addLayer2Group(MgLayer layer, string layerGroupName,
>>>> string layerGroupLegendLabel, MgMap map)
>>>> // Adds a layer to a layer group. If necessary, it creates
>>>> // the layer group.
>>>> {
>>>> //Get the layer group
>>>> MgLayerGroup layerGroup;
>>>> MgLayerGroupCollection layerGroupCollection =
>>>> map.GetLayerGroups();
>>>> if( layerGroupCollection.Contains(layerGroupName) )
>>>> {
>>>> layerGroup = layerGroupCollection.GetItem(layerGroupName);
>>>> }
>>>> else
>>>> {
>>>> //It does not exist, so create it.
>>>> layerGroup = new MgLayerGroup(layerGroupName);
>>>> layerGroup.SetVisible(true);
>>>> layerGroup.SetDisplayInLegend(true);
>>>> layerGroup.SetLegendLabel(layerGroupLegendLabel);
>>>> layerGroupCollection.Add(layerGroup);
>>>> }
>>>> //Add the layer to the group.
>>>> layer.SetGroup(layerGroup);
>>>> }
>>>>
>>>>
>>>>
>>>>
>>>> Kenneth Skovhede, GEOGRAF A/S wrote:
>>>>
>>>>
>>>>> Did you look at the buffer sample code in the AJAX viewer?
>>>>> It does exactly what is required, besides inserting your points.
>>>>>
>>>>> About your code:
>>>>> You do not use the "resourceIdentifier" variable, which means your
>>>>> layer might reference something else.
>>>>> You save the layers to the regular repository, which is fine, but
>>>>> each use will overwrite the previous copy, making it impossible to
>>>>> reliably serve more than one user.
>>>>> You do not add the layer to the runtime map, and you do not save the
>>>>> runtime map.
>>>>>
>>>>> You write: "I just want to display them".
>>>>> Well, MapGuide works by displaying data from a FeatureSource, styled
>>>>> through a LayerDefinition.
>>>>> You cannot insert data in the LayerDefinition, it must be in a
>>>>> FeatureSource.
>>>>>
>>>>> If you insert the data in an existing FeatureSource, with an existing
>>>>> layer, that is fine too, but I cannot guess that is what you want.
>>>>>
>>>>> You did not mention an Xml file with points before, just a single
>>>>> point.
>>>>>
>>>>> Depending on your data, you may want to insert them into a database
>>>>> (like Sqlite or Access), or into an SDF file.
>>>>> If you choose the database version, your FeatureSource can be of type
>>>>> ODBC.
>>>>>
>>>>> If you use a database, you can insert the points using regular SQL
>>>>> queries against the database.
>>>>> If the points are persistent (that is, not tied to a particular users
>>>>> map, like session values), you can just create a FeatureSource +
>>>>> Layer through Maestro or Studio without requirering any code.
>>>>>
>>>>> If you are looking to create something similar to "Points of interrest"
>>>>> with a nice little flag, you might
>>>>> consider using OpenLayers instead of the AJAX viewer:
>>>>> http://www.openlayers.org/
>>>>> http://www.openlayers.org/dev/examples/georss-markers.html
>>>>> (OpenLayers also supports MapGuide as the backend server)
>>>>>
>>>>>
>>>>> Regards, Kenneth Skovhede, GEOGRAF A/S
>>>>>
>>>>>
>>>>>
>>>>> Galois skrev:
>>>>>
>>>>>
>>>>>> First of all, thank u fro your reply.
>>>>>>
>>>>>> I don't get why should I create a temp layer.
>>>>>> I have some coordinates in an XML file, and I just want to display
>>>>>> them on an existing layer.
>>>>>>
>>>>>> Though I tried to create a new layer, it does not appear in my maps
>>>>>> layers.
>>>>>>
>>>>>> That's what I did...
>>>>>>
>>>>>>
>>>>>>
>>>>>> MgResourceIdentifier resourceIdentifier = new
>>>>>> MgResourceIdentifier("Library://GoSpatial/Data/airports.FeatureSource");
>>>>>> MgResourceIdentifier layerResId = new
>>>>>> MgResourceIdentifier("Library://GoSpatial/Layers/TmpLayer.LayerDefin
>>>>>> i
>>>>>> tion");
>>>>>>
>>>>>>
>>>>>> string layerDefinition =
>>>>>> File.ReadAllText("C:/Inetpub/wwwroot/iwaygis/TmpLayer.LayerDefinitio
>>>>>> n
>>>>>> .xml");
>>>>>>
>>>>>>
>>>>>> MgByteReader reader = new MgByteReader(layerDefinition,
>>>>>> "text/xml");
>>>>>>
>>>>>> resourceSrvc.SetResource(layerResId, reader, null);
>>>>>>
>>>>>>
>>>>>> tmpLayer = new MgLayer(layerResId, resourceSrvc);
>>>>>> tmpLayer.SetName("TempLayer");
>>>>>> tmpLayer.SetLegendLabel("TempLayer");
>>>>>> tmpLayer.SetDisplayInLegend(true);
>>>>>> tmpLayer.SetSelectable(true);
>>>>>>
>>>>>> MgLayerCollection layers = map.GetLayers();
>>>>>> layers.Insert(0, tmpLayer);
>>>>>> tmpLayer.SetVisible(true);
>>>>>> tmpLayer.ForceRefresh();
>>>>>>
>>>>>> Thx!
>>>>>>
>>>>>>
>>>>>>
>>>>>> Kenneth Skovhede, GEOGRAF A/S wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>> A few steps are involved:
>>>>>>>
>>>>>>> 1. Create a temporary featuresource 2. Create a temporary layer to
>>>>>>> display the features 3. Insert the temporary layer into the runtime
>>>>>>> map
>>>>>>>
>>>>>>> The buffer files in the MapGuide viewer has template code for all
>>>>>>> three steps.
>>>>>>> All steps are explained in the Developer Guide (PDF version at
>>>>>>> least).
>>>>>>>
>>>>>>> You might also want to look here:
>>>>>>> http://trac.osgeo.org/mapguide/wiki/CodeSamples/ASP.Net/ScribbleApp
>>>>>>>
>>>>>>> Regards, Kenneth Skovhede, GEOGRAF A/S
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Galois skrev:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> I´m trying to add a point to a map but I have no idea how to it.
>>>>>>>>
>>>>>>>> I have declare the map object, and also I create a point with it's
>>>>>>>> coordinates.
>>>>>>>>
>>>>>>>> But I don't know what is the next step that I have to do...
>>>>>>>>
>>>>>>>> The code follows....
>>>>>>>>
>>>>>>>>
>>>>>>>> public partial class _Default : System.Web.UI.Page {
>>>>>>>> public string sessionId;
>>>>>>>> public string webLayout;
>>>>>>>>
>>>>>>>> protected void Page_Load(object sender, EventArgs e)
>>>>>>>> {
>>>>>>>> string physicalPath = @"C:\Program
>>>>>>>> Files\MapGuideOpenSource\WebServerExtensions\www\webconfig.ini";
>>>>>>>>
>>>>>>>> try
>>>>>>>> {
>>>>>>>> MapGuideApi.MgInitializeWebTier(physicalPath);
>>>>>>>>
>>>>>>>>
>>>>>>>> passAndSession();
>>>>>>>>
>>>>>>>> //Associate a session ID with the MgSiteConnection
>>>>>>>> Object
>>>>>>>> MgUserInformation userInfo_new = new
>>>>>>>> MgUserInformation(sessionId);
>>>>>>>>
>>>>>>>> MgSiteConnection siteConnection = new
>>>>>>>> MgSiteConnection();
>>>>>>>>
>>>>>>>> siteConnection.Open(userInfo_new);
>>>>>>>>
>>>>>>>> MgResourceService resourceSrvc =
>>>>>>>> (MgResourceService)siteConnection.CreateService(MgServiceType.Reso
>>>>>>>> u
>>>>>>>> rceService);
>>>>>>>>
>>>>>>>>
>>>>>>>> MgMap map = new MgMap(siteConnection);
>>>>>>>>
>>>>>>>> webLayout =
>>>>>>>> "Library://GoSpatial/Web+Layouts/Autostrada+Brescia+Padova+Map.Web
>>>>>>>> L
>>>>>>>> ayout";
>>>>>>>>
>>>>>>>> MgResourceIdentifier resId = new
>>>>>>>> MgResourceIdentifier("Library://GoSpatial/Maps/Italy
>>>>>>>> Map.MapDefinition");
>>>>>>>>
>>>>>>>> String mapName = resId.GetName();
>>>>>>>>
>>>>>>>> MgResourceIdentifier mapStateId = new
>>>>>>>> MgResourceIdentifier("Session:" + sessionId + "//" + mapName + "."
>>>>>>>> + MgResourceType.Map);
>>>>>>>>
>>>>>>>> map.Create(resourceSrvc, resId, mapName);
>>>>>>>>
>>>>>>>> map.Save(resourceSrvc, mapStateId);
>>>>>>>>
>>>>>>>> map.Open(resourceSrvc, mapName);
>>>>>>>>
>>>>>>>> createPoint();
>>>>>>>>
>>>>>>>>
>>>>>>>> }
>>>>>>>> catch (Exception ex)
>>>>>>>> {
>>>>>>>> throw (ex);
>>>>>>>> }
>>>>>>>> }
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> public string passAndSession()
>>>>>>>> {
>>>>>>>> MgUserInformation userInfo = new
>>>>>>>> MgUserInformation("Administrator",
>>>>>>>> "admin");
>>>>>>>>
>>>>>>>> MgSite site = new MgSite();
>>>>>>>>
>>>>>>>> site.Open(userInfo);
>>>>>>>>
>>>>>>>> sessionId = site.CreateSession();
>>>>>>>> return sessionId;
>>>>>>>> }
>>>>>>>>
>>>>>>>> public MgPoint createPoint()
>>>>>>>> {
>>>>>>>> MgGeometryFactory geometryFactory = new
>>>>>>>> MgGeometryFactory();
>>>>>>>>
>>>>>>>> MgCoordinateXY coordinate = (MgCoordinateXY)
>>>>>>>> geometryFactory.CreateCoordinateXY(10.913161, 45.408046);
>>>>>>>>
>>>>>>>> MgPoint point = geometryFactory.CreatePoint(coordinate);
>>>>>>>> return point;
>>>>>>>> }
>>>>>>>> }
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> mapguide-users mailing list
>>>>>>> mapguide-users at lists.osgeo.org
>>>>>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> mapguide-users mailing list
>>>>> mapguide-users at lists.osgeo.org
>>>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users
>>>>>
>>>>>
>>>>>
>>>>>
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