#ifndef DRAWER_H_
#define DRAWER_H_

#include <gtk/gtk.h>
#include <gtk/gtkgl.h>
#include "Vertex.h"

class Window;


class Drawer {
  private:
    GtkWidget *drawer;
    GtkWidget *drawingArea;
    GtkAdjustment *hAdjustment, *vAdjustment;
    int zoomExp;
    
    Window *window;
    
    float scale;
    float xTranslate, yTranslate;
    
    // prevent shallow copy
    Drawer(const Drawer &w);
    const Drawer& operator=(const Drawer &w);
    
    void updateViewport();
    void updateScrolling();
    void updateScrollbars(float x = 0.5f, float y = 0.5f);
    
    void updateHoveredPoint(float x, float y);
    
    gint getWidth() const {
      return drawingArea->allocation.width;
    }
    
    gint getHeight() const {
      return drawingArea->allocation.height;
    }
    
    static void realize(GtkWidget *widget, Drawer *drawer);
    static gboolean eventHandler(GtkWidget *widget, GdkEvent *event, Drawer *drawer);
    static void valueChanged(GtkAdjustment *adjustment, Drawer *drawer);
    
  public:
    Drawer(Window *window, GdkGLConfig *glconfig);
    virtual ~Drawer();
    
    void zoom(int zoom, float x = 0.5f, float y = 0.5f);
    
    void imageToView(Vertex *v);
    void viewToImage(Vertex *v);

    float getImageWidth();
    float getImageHeight();

    float getXTranslate() {
      return xTranslate;
    }
    
    float getYTranslate() {
      return yTranslate;
    }
    
    float getScale() {
      return scale;
    }
    
    GtkWidget *getWidget() {
      return drawer;
    }
    
    void update() {
      gtk_widget_queue_draw(drawingArea);
    }
};

#endif /*DRAWER_H_*/