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以下代码是简单的添加新层的功能:
CRhinoCommand::result CCommandAddNewLayer::RunCommand(
const CRhinoCommandContext& context
)
{
// Get reference to the document's layer table
CRhinoLayerTable& layer_table = context.m_doc.m_layer_table;
// Cook up an unused layer name
ON_wString unused_name;
layer_table.GetUnusedLayerName( unused_name );
// Prompt the user to enter a layer name
CRhinoGetString gs;
gs.SetCommandPrompt( L"Name of layer to add" );
gs.SetDefaultString( unused_name );
gs.AcceptNothing( TRUE );
gs.GetString();
if( gs.CommandResult() != CRhinoCommand::success )
return gs.CommandResult();
// Was a layer named entered?
ON_wString layer_name = gs.String();
layer_name.TrimLeftAndRight();
if( layer_name.IsEmpty() )
{
RhinoApp().Print( L"Layer name cannot be blank.\n" );
return CRhinoCommand::cancel;
}
// Is the layer name valid?
if( !RhinoIsValidName(layer_name) )
{
RhinoApp().Print( L"\"%s\" is not a valid layer name.\n", layer_name );
return CRhinoCommand::cancel;
}
// Does a layer with the same name already exist?
int layer_index = layer_table.FindLayer( layer_name );
if( layer_index >= 0 )
{
RhinoApp().Print( L"A layer with the name \"%s\" already exists.\n", layer_name );
return CRhinoCommand::cancel;
}
// Create a new layer
ON_Layer layer;
layer.SetLayerName( layer_name );
// Add the layer to the layer table
layer_index = layer_table.AddLayer( layer );
if( layer_index < 0 )
{
RhinoApp().Print( L"Unable to add \"%s\" layer.\n", layer_name );
return CRhinoCommand::failure;
}