[mapguide-users] Selecting a feature through PHP
George McLean
gmclean at gorge.net
Wed Jan 31 16:58:17 EST 2007
Hello,
I have a php page the allows the user to enter some search criteria and
then to zoom to a feature based on the search results. This seems to
work pretty well by passing coordinates and zoom scale to the ZoomToView
function. What I would like to do is highlight the selected feature so
it is obvious which feature was selected. I thought I could add the
feature to a selection set and it would show up as highlighted. So far I
have not been able to get this to work.
My first question would be is this the best approach to highlight a feature?
If so, the following code snippet shows how I am attempting to add the
feature to a selection set so it will be highlighted, maybe someone will
have some insight as to why it is not working (or a better way to do this!).
Thanks in advance.
George
$agfReaderWriter = new MgAgfReaderWriter();
$aSelection = new MgSelection($map);
$bFound = 0;
while ($featureReader->ReadNext())
{
$val = $featureReader->GetGeometry('geometry');
if ($val != NULL) {
$aGeometry = $agfReaderWriter->Read($val);
$aPoint = $aGeometry->GetCentroid();
$aCoord = $aPoint->GetCoordinate();
$x = $aCoord->GetX();
$y = $aCoord->GetY();
$aResourceId = new
MgResourceIdentifier("Library://MapGuideStudio/Layers/Meters.LayerDefinition");
$aLayer = new MgLayer($aResourceId, $resourceService);
$aSelection->AddFeatures($aLayer, $featureReader, 1);
$aLayer->ForceRefresh();
$bFound = 1; // found coordinates
} else {
echo "This geometry property is null <br>";
}
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