rhino犀牛的二次开发sdk程序代码

johnsunjiang

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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;
    }


    return CRhinoCommand::success;
  }

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张少杰