/*
Copyright (C) 1999-2006 Id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.

This file is part of GtkRadiant.

GtkRadiant is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

GtkRadiant 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

//-----------------------------------------------------------------------------
//
// DESCRIPTION:
// a class to handle control points in a 2D view
// TODO: this one can be placed under an interface, and provided to the editor as service
//
// NOTE: the C2DView *m_p2DView is the orthogonal mapping between window and ST space
// in Drag mode (for rotation) we need an orthonormal XY space
// we do ST <-> XY transformations using the texture size
// ( for translation-only moves, orthogonal is enough )
// FIXME: is there a better way to deal between Window space <-> ST space <-> XY space ?
//
// NOTE: ControlPointsManagers are a bit different between brush faces and patches
// so there's a base virtual class, and we have two versions

#ifndef _CONTROLPOINTSMANAGER_H_
#define _CONTROLPOINTSMANAGER_H_

class CControlPointsManager
{
protected:
  // used by Render
  OpenGLBinding *m_pQglTable;
  C2DView		*m_p2DView;
public:
  CControlPointsManager() { m_pQglTable = NULL; m_p2DView = NULL; }
  virtual ~CControlPointsManager() { }
  void Init( C2DView *p2DView, OpenGLBinding *pQglTable ) { m_pQglTable = pQglTable; m_p2DView = p2DView; }

  virtual bool OnLButtonDown (int x, int y) = 0;
  virtual bool OnMouseMove (int x, int y) = 0;
  virtual bool OnLButtonUp (int x, int y) = 0;

  virtual void render() = 0;
  virtual void Commit() = 0;
};

// brush face manager
class CControlPointsManagerBFace : public CControlPointsManager
{
  enum		EManagerState { Idle, Drag } ManagerState;
  int			m_NumPoints;
  // initial geometry
  CtrlPts_t	m_RefPts;
  // current geometry
  CtrlPts_t	*m_pPts;
  // transform matrix ( 2DView is Window <-> ST )
  float		m_TM[2][3];
  // texture size for ST <-> XY
  int			m_TexSize[2];
  // used when translating
  float		m_TransOffset[2];
  // dragged point index
  int			m_iDragPoint;
  // do we have an anchor ?
  bool		m_bGotAnchor;
  // anchor point index
  int			m_iAnchorPoint;
  // coordinates of Anchor
  float		m_Anchor[2];
  // used for commit
  _QERFaceData	*m_pFaceData;

public:
  // construction / init -------------------------------------------------
  CControlPointsManagerBFace() { ManagerState = Idle; }
  virtual ~CControlPointsManagerBFace() { }
  // NOTE: pQglTable is sent to CControlPointsManager::Init
  void Init(int iPts, CtrlPts_t *Pts, C2DView *p2DView, int TexSize[2], _QERFaceData* pFaceData, OpenGLBinding *pQglTable);
  // CControlPointsManager interface -------------------------------------

  virtual bool OnLButtonDown (int x, int y);
  virtual bool OnMouseMove (int x, int y);
  virtual bool OnLButtonUp (int x, int y);

  virtual void render();
  virtual void Commit();

private:
  // internal members
  void UpdateCtrlPts();
  void ComputeTransOffset(int i);
  void XYSpaceForSTSpace( float xy[2], const float st[2] );
};

// patch manager
class CControlPointsManagerPatch : public CControlPointsManager
{
  enum		EManagerState { Idle, Drag } ManagerState;
  // reference data, used for commits
  patchMesh_t* m_pPatch;
  // work patch, holds current data
  patchMesh_t* m_pWorkPatch;
  int			m_iDragPoint[2];

public:
  // construction / init -------------------------------------------------
  CControlPointsManagerPatch() { ManagerState = Idle; }
  virtual ~CControlPointsManagerPatch() { }
  // NOTE: pQglTable is sent to CControlPointsManager::Init
  void Init( patchMesh_t* pWorkPatch, C2DView *p2DView, OpenGLBinding *pQglTable, patchMesh_t* pPatch );
  // CControlPointsManager interface -------------------------------------

  virtual bool OnLButtonDown (int x, int y);
  virtual bool OnMouseMove (int x, int y);
  virtual bool OnLButtonUp (int x, int y);

  virtual void render();
  virtual void Commit();
};

#endif