StylizationUtil::GetCompositeSymbolizationBounds doesn't handle expressions

[waltweltonlair]

The StylizationUtil::GetCompositeSymbolizationBounds method computes the bounds of a symbol. It calls GetCompositeSymbolizationBoundsInternal, but passes in NULL for the FdoExpressionEngine. Since the engine is NULL the evaluation of the bounds will fail (an exception is raised) if the symbol has any expressions.

[waltweltonlair]

In Stylization the ExpressionHelper::GetExpressionEngine method is used to obtain an expression engine initialized with the custom stylization functions. As part of this call strings need to be read from the platform resource file. Therefore in order for this call to succeed the platform must have been previously initialized via a call to MgConfiguration::LoadConfiguration (which includes specifying the path to the resource file).

Until recently MapGuide Studio (which calls StylizationUtil::GetCompositeSymbolizationBounds) did not initialize the platform, which is why NULL was being used for the expression engine. But now that Studio does initialize the platform we can change this code to create the engine.

In general, any application which uses the platform must initialize it via a call to MgConfiguration::LoadConfiguration.

[waltweltonlair]

Fixed with submission ​https://trac.osgeo.org/mapguide/changeset/3094.

[waltweltonlair]

Merged fix into branch stream with submission ​https://trac.osgeo.org/mapguide/changeset/3127.