addlayer

          
partial class Examples
{
  public static Rhino.Commands.Result AddLayer(Rhino.RhinoDoc doc)
  {
    // Cook up an unused layer name
    string unused_name = doc.Layers.GetUnusedLayerName(false);

    // Prompt the user to enter a layer name
    Rhino.Input.Custom.GetString gs = new Rhino.Input.Custom.GetString();
    gs.SetCommandPrompt("Name of layer to add");
    gs.SetDefaultString(unused_name);
    gs.AcceptNothing(true);
    gs.Get();
    if (gs.CommandResult() != Rhino.Commands.Result.Success)
      return gs.CommandResult();

    // Was a layer named entered?
    string layer_name = gs.StringResult().Trim();
    if (string.IsNullOrEmpty(layer_name))
    {
      Rhino.RhinoApp.WriteLine("Layer name cannot be blank.");
      return Rhino.Commands.Result.Cancel;
    }

    // Is the layer name valid?
    if (!Rhino.DocObjects.Layer.IsValidName(layer_name))
    {
      Rhino.RhinoApp.WriteLine(layer_name + " is not a valid layer name.");
      return Rhino.Commands.Result.Cancel;
    }

    // Does a layer with the same name already exist?
    int layer_index = doc.Layers.Find(layer_name, true);
    if (layer_index >= 0)
    {
      Rhino.RhinoApp.WriteLine("A layer with the name {0} already exists.", layer_name);
      return Rhino.Commands.Result.Cancel;
    }

    // Add a new layer to the document
    layer_index = doc.Layers.Add(layer_name, System.Drawing.Color.Black);
    if (layer_index < 0)
    {
      Rhino.RhinoApp.WriteLine("Unable to add {0} layer.", layer_name);
      return Rhino.Commands.Result.Failure;
    }
    return Rhino.Commands.Result.Success;
  }
}