arc-look-at/ArcLookAt.hpp

/*
   For more information, please see: http://software.sci.utah.edu

   The MIT License

   Copyright (c) 2013 Scientific Computing and Imaging Institute,
   University of Utah.


   Permission is hereby granted, free of charge, to any person obtaining a
   copy of this software and associated documentation files (the "Software"),
   to deal in the Software without restriction, including without limitation
   the rights to use, copy, modify, merge, publish, distribute, sublicense,
   and/or sell copies of the Software, and to permit persons to whom the
   Software is furnished to do so, subject to the following conditions:

   The above copyright notice and this permission notice shall be included
   in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   DEALINGS IN THE SOFTWARE.
*/


#ifndef IAUNS_ARC_LOOK_AT_H
#define IAUNS_ARC_LOOK_AT_H

#include <stdint.h>
#include <memory>

#include <glm/glm.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <glm/gtc/matrix_inverse.hpp>
#include <glm/gtc/matrix_transform.hpp>

#include <glm-aabb/AABB.hpp>

// Forward declaration of ArcBall in its CPM namespace.
namespace CPM_ARC_BALL_NS {
  class ArcBall;
}

namespace CPM_ARC_LOOK_AT_NS {

class ArcLookAt
{
public:
  ArcLookAt();
  virtual ~ArcLookAt();
  
  void doReferenceDown(const glm::vec2& ssPos);

  void doPan(const glm::vec2& ssPos);

  void doRotation(const glm::vec2& ssPos);

  void doZoom(glm::float_t camZoom);

  void doZoom(const glm::vec2& ssPos);

  void autoview(const CPM_GLM_AABB_NS::AABB& aabb, float fov);

  glm::float_t getCamDistance() const   {return mCamDistance;}

  glm::vec3 getLookAt() const   {return mCamLookAt;}

  glm::mat4 getWorldViewTransform() const;

private:
  std::unique_ptr<CPM_ARC_BALL_NS::ArcBall>  mArcBall;

  glm::vec3                 mCamLookAt;     
  glm::float_t              mCamDistance;   

  // The following are reference variables set when doReferenceDown is called.
  glm::vec2                 mReferenceScreenPos;
  glm::vec3                 mReferenceLookAt;
  glm::mat4                 mReferenceTransform;
  glm::float_t              mReferenceCamDistance;
};

} // namespace CPM_ARC_LOOK_AT_NS 

#endif