Developer's Guide - MapGuide Open Source - OSGeo

Example
$queryOptions = new MgFeatureQueryOptions();
$queryOptions->SetFilter("RTYPE = 'MFG'");
$queryOptions->SetSpatialFilter('SHPGEOM', $bufferGeometry,
MgFeatureSpatialOperations::Inside);
$featureResId = new MgResourceIdentifier(
"Library://Samples/Sheboygan/Data/Parcels.FeatureSource");
$featureReader = $featureService->SelectFeatures($featureResId,
"Parcels", $queryOptions);
This example builds on the example from Working With the Active Selection
(page 46). Instead of listing the parcels in the selection, it creates a series of
concentric buffers around the selection, showing increasing distance. The
code sections below contain the significant additions in this example. The
complete source code is available with the Developer’s Guide samples.
Because this example modifies the map, it must refresh the map when it loads,
by executing a JavaScript function. Add the function to the page.
function OnPageLoad()
{
parent.parent.Refresh();
}
Add an OnLoad command to the element:
The example uses a temporary map layer named Buffer to store the buffer
feature. It creates a feature source and the layer if it does not exist. Otherwise,
it deletes any existing features before creating the new buffer. The functions
CreateBufferFeatureSource() and CreateBufferLayer() are in
bufferfunctions.php, which is described below.
Example | 81