GM_CreateCustomVectorLayer |
Creates a new custom layer for adding vector features to. The handle to the newly created layer is returned. You must call GM_CloseLayer on the returned handle when you are done with it. If a problem occurs, NULL is returned for the layer handle. After creating the layer, use the GM_AddAreaToVectorLayer, GM_AddLineToVectorLayer, and GM_AddPointToVectorLayer functions to add features to the layer.
SyntaxGM_DLL_EXPORTED GM_LayerHandle_t32 GM_CreateCustomVectorLayer ( const char* aDescription, // IN: Description to use for layer (can be NULL to use default) const GM_Projection_t* aProj // IN: Native projection of new layer );