GM_CombineAreas

GM_Error_t32 __stdcall GM_CombineAreas

(

const GM_AreaFeature_t**    aAreaList,      // IN: List of areas to combine

uint32                      aNumAreas,      // IN: Number of areas in aAreaList

const GM_Projection_t*      aAreaProj,      // IN: Projection system the area coordinates are in (use NULL for current projection)

GM_LayerHandle_t32          aNewAreaLayer   // IN: Layer to add new combined areas to

)

// Build the list of areas to combine

GM_AreaFeature_t** theAreaList = new GM_AreaFeature_t*[ theLayerInfo->mNumAreas ];

uint32 i;

for ( i = 0; i < theLayerInfo->mNumAreas; i++ )

{

    // Get the area feature

    theAreaList[i] = GM_GetAreaFeature( aLayerHandle, i );

}



// Create a new layer and combine the areas into it

GM_LayerHandle_t32 theNewAreaLayer = GM_CreateCustomVectorLayer( "CombinedAreas", &theLayerInfo->mNativeProj );

theErr = GM_CombineAreas( (const GM_AreaFeature_t**)theAreaList, theLayerInfo->mNumAreas, &theLayerInfo->mNativeProj, theNewAreaLayer );



// Free the area features that we combined

for ( i = 0; i < theLayerInfo->mNumAreas; i++ )

{

    GM_FreeAreaFeature( theAreaList[i] );

}



// Free the area list

delete[] theAreaList;

theAreaList = NULL;