LEADTOOLS provides a number of functions for working with the vector layers within a vector handle. Several functions provide a means of obtaining information about vector layers, while other functions provide a means of actually modifying vector layers.
Getting Information about Vector Layers
A vector handle may contain multiple vector layers. The LVectorBase::GetLayerCount returns the number of layers present in the class object's associated vector handle. Once the number of layers present is known, each layer can be obtained using LVectorBase::GetLayerByIndex. If the name of a layer is known, that layer can be obtained using LVectorBase::GetLayerByName. LVectorBase::EnumLayers actually enumerates all the layers present in a vector handle. The LVectorBase::EnumLayersCallBack function called by LVectorBase::EnumLayers lets you process each enumerated layer.
Once a handle to a vector layer is obtained, information about that vector layer can be obtained using LVectorLayer::GetLayerDesc. This vector layer information can then be modified using LVectorLayer::SetLayerDesc. LVectorLayer::GetLayerDesc fills a VECTORLAYERDESC structure with the information about the class object's vector layer. The information within the VECTORLAYERDESC structure can then be modified and the vector layer information updated using LVectorLayer::SetLayerDesc.
Manipulating Vector Layers
LEADTOOLS provides a number of functions for manipulating vector layers. LVectorBase::SetActiveLayer and LVectorLayer::SetLayerDesc let you set the active layer in a vector handle and modify information about a specific vector layer. For more information, refer to Getting Information About Vector Layers above, or the functions themselves.
The contents of one layer can be copied to another layer using LVectorBase::CopyLayer.
LVectorBase::AddLayer lets you add a new layer to a vector handle.
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