public static Result GetAngle(RhinoDoc doc) { var gp = new GetPoint(); gp.SetCommandPrompt("Base point"); gp.Get(); if (gp.CommandResult() != Result.Success) { return(gp.CommandResult()); } var base_point = gp.Point(); gp.SetCommandPrompt("First reference point"); gp.DrawLineFromPoint(base_point, true); gp.Get(); if (gp.CommandResult() != Result.Success) { return(gp.CommandResult()); } var first_point = gp.Point(); double angle_radians; var rc = RhinoGet.GetAngle("Second reference point", base_point, first_point, 0, out angle_radians); if (rc == Result.Success) { RhinoApp.WriteLine("Angle = {0} degrees", RhinoMath.ToDegrees(angle_radians)); } return(rc); }