/*

  KLayout Layout Viewer
  Copyright (C) 2006-2020 Matthias Koefferlein

  This program 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.

  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 General Public License for more details.

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

*/

#ifndef HDR_layD25ViewWidget
#define HDR_layD25ViewWidget

#include <QOpenGLWidget>
#include <QOpenGLVertexArrayObject>
#include <QOpenGLBuffer>
#include <QOpenGLShaderProgram>
#include <QOpenGLFunctions>
#include <QMatrix4x4>
#include <QPoint>
#include <QVector3D>

namespace lay
{

class D25ViewWidget
  : public QOpenGLWidget,
    private QOpenGLFunctions
{
Q_OBJECT 

public:
  D25ViewWidget (QWidget *parent);
  ~D25ViewWidget ();

  void wheelEvent (QWheelEvent *event);
  void mousePressEvent (QMouseEvent *event);
  void mouseReleaseEvent (QMouseEvent *event);
  void mouseMoveEvent (QMouseEvent *event);

private:
  QOpenGLShaderProgram *m_program;
  GLuint m_posAttr;
  GLuint m_colAttr;
  GLuint m_matrixUniform;
  QMatrix4x4 m_cam_trans;
  bool m_dragging, m_rotating;
  QVector3D m_cam_position;
  double m_cam_azimuth, m_cam_elevation;
  QPoint m_start_pos;
  QVector3D m_start_cam_position;
  double m_start_cam_azimuth, m_start_cam_elevation;

  void initializeGL ();
  void paintGL ();
  void resizeGL (int w, int h);

  void update_cam_trans ();
};

}

#endif