[mapguide-users] Dynamically Setting Initial Map Position and Scale

[Love, Bev (Capita Symonds)]

Afternoon all,

 

I'm hoping someone will be able to look through the code I have to
dynamically set the initial map position and scale. I have taken this
straight from the code sample
(http://trac.osgeo.org/mapguide/wiki/CodeSamples/PHP/InitialMapView) but
when I run it, it just opens the map up at the default scale level. Any
help would be greatly appreciated...

 

I am passing in X, Y and Scale as parameters within the query string.

 

        global $_itkconfig, $session;

         //this code is used to display the Open Source MapGuide Web
Layout screen

         //common file from MapGuide Open Source

         require_once('..\data\common.php');                    

         

         //need to include the MapGuide Open Source constants file for
PHP        

 
require_once($_itkconfig['site']['mapObject']['viewerDir'].'constants.ph
p');

 

       //

      // Check and get the required parameters.

      //

      if (!isset($_REQUEST["x"]) || !isset($_REQUEST["y"]) ||
!isset($_REQUEST["scale"])) {

          echo "<Error>One or more of the required arguments is
missing.</Error>";

          exit;

      }

 

      $x = $_REQUEST["x"];

      $y = $_REQUEST["y"];

      $scale = $_REQUEST["scale"];

 

 

        //

        // Usual initialisation step.

        //

 
MgInitializeWebTier($_itkconfig['site']['mapObject']['webConfigFilePath'
]);

 

        //

        // Obtain a new session ID for this anonymous user, use it to
set up

        // a new site connection and use that to create a resource
service.

        //

        $site = new MgSite();

        $site->Open(new MgUserInformation("Anonymous", ""));

 

        $sessionId = $site->CreateSession();

 

        $siteConnection = new MgSiteConnection();

        $siteConnection->Open(new MgUserInformation($sessionId));

 

        $resourceService =
$siteConnection->CreateService(MgServiceType::ResourceService);

 

        //

        // Read the web layout into an XML DOM document object.

        //

        $wl = "Library:// Layouts/Development_Layout.WebLayout"; // TODO
Constant!

        $wlResourceId = new MgResourceIdentifier($wl);

        $wlReader = $resourceService->GetResourceContent($wlResourceId);

        $wlXml = $wlReader->ToString();

        $wlDomDoc = DOMDocument::loadXML($wlXml); 

 

        //

        // Now, update the initial x, y and scale values with the
desired values.

        //

        $nodeCenterX =
$wlDomDoc->getElementsByTagName("CenterX")->item(0);

        $nodeCenterX->nodeValue = "$x";

 

        $nodeCenterY =
$wlDomDoc->getElementsByTagName("CenterY")->item(0);

        $nodeCenterY->nodeValue = "$y";

 

        $nodeScale = $wlDomDoc->getElementsByTagName("Scale")->item(0);

        $nodeScale->nodeValue = "$scale";

 

        //

        // Prepare the updated XML to be written out to the session.

        //

        $updatedXml = $wlDomDoc->saveXML();

        $byteSource = new MgByteSource($updatedXml,
strlen($updatedXml));

 

        //

        // Create a web layout in the session to hold the updated
version

        // from the library.

        //

        $sessionMapName = $wlResourceId->GetName();

        $sessionWebLayout =
"Session:$sessionId//$sessionMapName.WebLayout";

        $sessionResourceId = new
MgResourceIdentifier($sessionWebLayout);

 

        //

        // Write the updated web layout to the session.

        //

        $resourceService->SetResource($sessionResourceId,
$byteSource->GetReader(), null);

 

        //

        // Redirect to the Ajax viewer pointing at the map at the
desired coordinates.

        //

        $redirectTo =
"mapguide/mapviewerajax/?SESSION=$sessionId&WEBLAYOUT=$sessionWebLayout"
; 

        $url = "http://localhost:8008/$redirectTo";

        

        

        header("Location: $url");

        exit;

 

Thanks,

 

Bev

 


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