/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2020 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 **/


#include "PanSceneTracker.h"
#include "../Viewport/IViewport.h"
#include "../Scene2DViewport/ViewportController.h"

#include <memory>

namespace OrthancStone
{
  PanSceneTracker::PanSceneTracker(boost::weak_ptr<IViewport> viewport,
                                   const PointerEvent& event)
    : OneGesturePointerTracker(viewport)
  {
    
    std::unique_ptr<IViewport::ILock> lock(GetViewportLock());

    originalSceneToCanvas_ = lock->GetController().GetSceneToCanvasTransform();
    originalCanvasToScene_ = lock->GetController().GetCanvasToSceneTransform();

    pivot_ = event.GetMainPosition().Apply(originalCanvasToScene_);
  }


  void PanSceneTracker::PointerMove(const PointerEvent& event)
  {
    ScenePoint2D p = event.GetMainPosition().Apply(originalCanvasToScene_);

    std::unique_ptr<IViewport::ILock> lock(GetViewportLock());

    lock->GetController().SetSceneToCanvasTransform(
      AffineTransform2D::Combine(
        originalSceneToCanvas_,
        AffineTransform2D::CreateOffset(p.GetX() - pivot_.GetX(),
                                        p.GetY() - pivot_.GetY())));
    lock->Invalidate();
  }

  void PanSceneTracker::Cancel()
  {
    std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
    lock->GetController().SetSceneToCanvasTransform(originalSceneToCanvas_);
  }
}