/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2021 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 "RotateSceneTracker.h"
#include "../Scene2DViewport/ViewportController.h"

namespace OrthancStone
{
  RotateSceneTracker::RotateSceneTracker(boost::weak_ptr<IViewport> viewport,
                                         const PointerEvent& event) :
    OneGesturePointerTracker(viewport),
    click_(event.GetMainPosition()),
    aligner_(viewport, click_),
    referenceAngle_(0),
    isFirst_(true)
  {
    std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
    originalSceneToCanvas_ = lock->GetController().GetSceneToCanvasTransform();
  }

  
  void RotateSceneTracker::PointerMove(const PointerEvent& event)
  {
    ScenePoint2D p = event.GetMainPosition();
    double dx = p.GetX() - click_.GetX();
    double dy = p.GetY() - click_.GetY();

    if (std::abs(dx) > 5.0 ||
        std::abs(dy) > 5.0)
    {
      double a = atan2(dy, dx);

      if (isFirst_)
      {
        referenceAngle_ = a;
        isFirst_ = false;
      }

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

      lock->GetController().SetSceneToCanvasTransform(
        AffineTransform2D::Combine(
          AffineTransform2D::CreateRotation(a - referenceAngle_),
          originalSceneToCanvas_));
      aligner_.Apply();
      lock->Invalidate();
    }
  }

  
  void RotateSceneTracker::Cancel()
  {
    // See remark above
    std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
    lock->GetController().SetSceneToCanvasTransform(originalSceneToCanvas_);
    lock->Invalidate();
  }
}