Program Listing for File QGLMap.h

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#ifndef MULTIRES_IMAGE_QGLMAP_H_
#define MULTIRES_IMAGE_QGLMAP_H_

// QT libraries
#include <QGLWidget>
#include <QMouseEvent>
#include <QWheelEvent>

// QT auto-generated headers
#include "ui_QGLMap.h"

#include <tf2/transform_datatypes.h>

#include <multires_image/tile.h>
#include <multires_image/tile_view.h>

namespace multires_image
{
  class QGLMap : public QGLWidget
  {
    Q_OBJECT

  public:
    explicit QGLMap(QWidget *parent = 0);
    ~QGLMap() override = default;

    void Exit();
    void UpdateView();
    void SetTiles(TileSet* tiles);

    tf2::Vector3 SceneCenter() { return m_scene_center; }
    tf2::Vector3 ViewCenter() { return m_view_center; }

  signals:
    void SignalZoomChange(double z);
    void SignalViewChange(double x1, double y1, double x2, double y2);
    void SignalMemorySize(int64_t bytes);

  public slots:
    void LoadTexture(Tile* tile);
    void DeleteTexture(Tile* tile);
    void ChangeCenter(double x, double y);
    void SetTextureMemory(int64_t bytes);

  protected:
    void initializeGL() override;
    void resizeGL(int w, int h) override;
    void paintGL() override;
    void mousePressEvent(QMouseEvent* e) override;
    void mouseDoubleClickEvent(QMouseEvent* e) override;
    void mouseReleaseEvent(QMouseEvent* e) override;
    void mouseMoveEvent(QMouseEvent* e) override;
    void wheelEvent(QWheelEvent* e) override;

  private:
    Ui::QGLMapClass ui;

    bool            m_initialized;

    double          m_scale;

    bool            m_mouseDown;
    int             m_mouseDownX;
    int             m_mouseDownY;

    TileView*       m_tileView;

    tf2::Vector3 m_view_top_left;
    tf2::Vector3 m_view_bottom_right;
    tf2::Vector3 m_view_center;

    tf2::Vector3 m_scene_top_left;
    tf2::Vector3 m_scene_bottom_right;
    tf2::Vector3 m_scene_center;

    void Recenter();
    void MousePan(int x, int y);
  };
}

#endif  // MULTIRES_IMAGE_QGLMAP_H_