Developer's Guide - MapGuide Open Source - OSGeo

Process each item in the MgFeatureReader.
// Merge them into a single feature.
$inputGeometries = new MgGeometryCollection();
while ($featureReader->ReadNext())
{
$featureGeometryData = $featureReader->GetGeometry('SHPGEOM');
$featureGeometry = $agfReaderWriter->Read($featureGeometryData);
}
$inputGeometries->Add($featureGeometry);
$geometryFactory = new MgGeometryFactory();
$mergedFeatures = $geometryFactory->
CreateMultiGeometry($inputGeometries);
// Add buffer features to the temporary feature source.
// Create multiple concentric buffers to show area.
$commands = new MgFeatureCommandCollection();
for ($bufferRing = 0; $bufferRing < $bufferRingCount;
$bufferRing++)
{
$bufferDist = $srs->
ConvertMetersToCoordinateSystemUnits($bufferRingSize *
($bufferRing + 1));
$bufferGeometry = $mergedFeatures->Buffer($bufferDist,
$srsMeasure);
}
$properties = new MgPropertyCollection();
$properties->Add(new MgGeometryProperty('BufferGeometry',
$agfReaderWriter->Write($bufferGeometry)));
$commands->Add(new MgInsertFeatures('BufferClass',
$properties));
$featureService->UpdateFeatures($bufferFeatureResId,
$commands, false);
$bufferLayer->SetVisible(true);
$bufferLayer->ForceRefresh();
$bufferLayer->SetDisplayInLegend(true);
84 | Chapter 5 Analyzing Features