//
// (C) Copyright 2003-2007 by Autodesk, Inc.
//
// Permission to use, copy, modify, and distribute this software in
// object code form for any purpose and without fee is hereby granted,
// provided that the above copyright notice appears in all copies and
// that both that copyright notice and the limited warranty and
// restricted rights notice below appear in all supporting
// documentation.
//
// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
// UNINTERRUPTED OR ERROR FREE.
//
// Use, duplication, or disclosure by the U.S. Government is subject to
// restrictions set forth in FAR 52.227-19 (Commercial Computer
// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
// (Rights in Technical Data and Computer Software), as applicable.
//  

using System;
using System.Windows.Forms;
using Autodesk.Revit;

namespace Revit.SDK.Samples.MoveLinear.CS
{
  /// <summary>
  /// Implements the Revit add-in interface IExternalCommand
  /// </summary>
  public class Command : Autodesk.Revit.IExternalCommand
  {
    #region IExternalCommand Members Implementation
    /// <summary>
    /// Implement this method as an external command for Revit.
    /// </summary>
    /// <param name="cmdData">An object that is passed to the external application 
    /// which contains data related to the command, 
    /// such as the application object and active view.</param>
    /// <param name="msg">A message that can be set by the external application 
    /// which will be displayed if a failure or cancellation is returned by 
    /// the external command.</param>
    /// <param name="eleSet">A set of elements to which the external application 
    /// can add elements that are to be highlighted in case of failure or cancellation.</param>
    /// <returns>Return the status of the external command. 
    /// A result of Succeeded means that the API external method functioned as expected. 
    /// Cancelled can be used to signify that the user cancelled the external operation 
    /// at some point. Failure should be returned if the application is unable to proceed with 
    /// the operation.</returns>
    public Autodesk.Revit.IExternalCommand.Result Execute(ExternalCommandData cmdData, ref string msg, Autodesk.Revit.ElementSet eleSet)
    {
      IExternalCommand.Result res = IExternalCommand.Result.Succeeded;
      try
      {
        System.Collections.IEnumerator iter;
        Autodesk.Revit.Selection sel;
        sel = cmdData.Application.ActiveDocument.Selection;
       
        Autodesk.Revit.ElementSet elemSet;
        elemSet = sel.Elements;
       
        iter = elemSet.ForwardIterator();
       
        iter.MoveNext();
        Autodesk.Revit.Element element;
       
        element = (Autodesk.Revit.Element)iter.Current;
       
        if( element != null )
        {
          Autodesk.Revit.LocationCurve lineLoc;
          lineLoc = (Autodesk.Revit.LocationCurve)element.Location;
         
          Autodesk.Revit.Geometry.Line line;
          Autodesk.Revit.Geometry.XYZ newStart;
          Autodesk.Revit.Geometry.XYZ newEnd;

          //get start point via "get_EndPoint(0)"
          newStart = lineLoc.Curve.get_EndPoint(0);
          //get end point via "get_EndPoint(1)"
          newEnd = lineLoc.Curve.get_EndPoint(1);
        
          newStart.X = newStart.X + 100;
          newEnd.Y = newEnd.Y + 100;

          //get a new line and use it to move current element 
          //with property "Autodesk.Revit.LocationCurve.Curve"
          line = cmdData.Application.Create.NewLineBound(ref newStart, ref newEnd);
          lineLoc.Curve = line;
        }
      }
      catch (Exception ex)
      {
        MessageBox.Show(ex.Message, "MoveLinear");
        res = IExternalCommand.Result.Failed;
      }
      finally
      {
      }
      return res;
    }
    #endregion IExternalCommand Members Implementation
  }
}