Dear All,
I have a select and zoom to extents problem in the ajax viewer. The user
chooses a postcode from a list, and this returns multiple results. I simply
want the map to zoom to the combined extent of these results. I thought the
right option to use is GetExtents, but when I try and derive the coordinates
from the envelope this creates (as a method of checking the php is correct
before moving on to the javascript), it returns the same value each time,
which I assume is probably the value for the entire layer. I have checked
that the correct number of features are returned, so I know it's not that.
Any thoughts would be greatly appreciated.
My code is as follows:
MgInitializeWebTier ($webconfigFilePath);
$userInfo = new MgUserInformation($sessionId);
$siteConnection = new MgSiteConnection();
$siteConnection->Open($userInfo);
echo $mapName."<br />";
$map = new MgMap($siteConnection);
$map->Open($mapName);
$cfilter = "POSTCODE = '$ccode'";
echo $cfilter.'<br />';
$queryOptions = new MgFeatureQueryOptions();
$queryOptions->SetFilter($cfilter);
echo $SMAlayer.'<br />';
$layers = $map->GetLayers();
$selLayer = $layers->GetItem($SMAlayer);
$featureresourceID = new
MgResourceIdentifier($selLayer->GetFeatureSourceId());
$featureclassname = $selLayer->GetFeatureClassName();
$featureService =
$siteConnection->CreateService(MgServiceType::FeatureService);
$dataReader =
$featureService->SelectFeatures($featureresourceID,
$featureclassname, $queryOptions);
$dataReader->ReadNext();
//$resourceService =
$siteConnection->CreateService(MgServiceType::ResourceService);
$selection = new MgSelection($map);
$selection->AddFeatures($selLayer, $dataReader, 0);
//$selection->Save($resourceService, $mapName);
$count =
$selection->GetSelectedFeaturesCount($selLayer,$featureclassname);
echo 'Count: '.$count.'<br />';
$dataReader->Close();
$extent = $selection->GetExtents($featureService);
$upperRightY = $extent->GetUpperRightCoordinate()->GetY();
$lowerLeftX=$extent->GetLowerLeftCoordinate()->GetX();
$width = $extent->GetWidth();
$height = $extent->GetHeight();
$centreX = $lowerLeftX + ($width)/2;
$centreY = $upperRightY - ($height)/2;
echo "Centre Coordinates: ".$centreX.",".$centreY;
Thanks
Jo
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