/* -*- C++ -*-

 *

 * This file is a part of LEMON, a generic C++ optimization library

 *

 * Copyright (C) 2003-2006

 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */

#ifndef GRAPH_DISPLAYER_CANVAS_H

#define GRAPH_DISPLAYER_CANVAS_H

class NoteBookTab;

#include "all_include.h"

#include <libgnomecanvasmm.h>

#include <libgnomecanvasmm/polygon.h>

///This class is the canvas, on which the digraph can be drawn.

class DigraphDisplayerCanvas : public Gnome::Canvas::CanvasAA

{

  friend class BrokenArc;

  friend class LoopArc;

  class ArcBase : public Gnome::Canvas::Group

  {

    protected:

      ///Reference to the canvas, on which the digraph is drawn.

      ///It is needed, because some datas needed from

      ///digraph can be accessed by this or should be sent

      ///as parameter, but it would be complicated

      DigraphDisplayerCanvas& canvas;

      ///The arc that the class displays.

      ///It is needed, because some datas needed from

      ///digraph can be accessed by this or should be sent

      ///as parameter, but it would be complicated

      Arc arc;

      Gnome::Canvas::Polygon arrow;

      void drawArrow(XY);

    public:

      ArcBase(Gnome::Canvas::Group&, Arc, DigraphDisplayerCanvas&);

      virtual ~ArcBase();

      virtual void draw() = 0;

      virtual void setLineWidth(int) = 0;

      virtual void setFillColor(Gdk::Color) = 0;

      virtual Gnome::Canvas::Item * getLine() = 0;

  };

  ///Arc displayer class

  ///This class is responsible for displaying arcs in digraph.

  ///The displayed arc is broken in the middle. The

  ///aim of this is to be able to indicate direction of arcs

  ///and to be able to display more then one arcs between the

  ///same source and target

  class BrokenArc : public ArcBase

  {

    private:

      Gnome::Canvas::Line line;

      ///Indicates whether the button of mouse is pressed or not at the moment.

      bool isbutton;

      ///At this location was the mousebutton pressed. Horizontal component.

      ///It helps to calculate the

      ///distance of dragging.

      double clicked_x;

      ///At this location was the mousebutton pressed. Vertical component.

      ///It helps to calculate the

      ///distance of dragging.

      double clicked_y;

      ///event handler for forming broken arcs

      ///\param event the

      ///event to handle

      bool arcFormerEventHandler(GdkEvent* event);

    public:

      ///Constructor of broken arc class.

      ///\param g the group to which the arc belongs

      ///\param _arc the represented arc

      ///\param gc the canvas

      BrokenArc(Gnome::Canvas::Group&, Arc, DigraphDisplayerCanvas&);

      ///Destructor of broken arc class

      ///Frees up

      ///reserved memory

      ~BrokenArc();

      ///The function that draws the arc based on collected data

      void draw();

      void setLineWidth(int);

      void setFillColor(Gdk::Color);

      Gnome::Canvas::Item * getLine() { return (Gnome::Canvas::Item *)(&line); };

  };

  class LoopArc : public ArcBase

  {

    private:

      Gnome::Canvas::Ellipse line;

      bool arcFormerEventHandler(GdkEvent* e);

      bool isbutton;

    public:

      LoopArc(Gnome::Canvas::Group&, Arc, DigraphDisplayerCanvas&);

      ~LoopArc();

      void draw();

      void setLineWidth(int);

      void setFillColor(Gdk::Color);

      Gnome::Canvas::Item * getLine() { return (Gnome::Canvas::Item *)(&line); };

  };

  ///Type of canvas, on which the digraph is drawn

  typedef Gnome::Canvas::CanvasAA Parent;

public:

  ///Constructor

  ///\param nbt the tab of the window, in which the digraph is displayed

  DigraphDisplayerCanvas(NoteBookTab & nbt);

  ///destructor of the class

  virtual ~DigraphDisplayerCanvas();

  ///Returns a color of the rainbow based on a map value and the min and max value of the given map

  ///min and max is purple, between them there is a linear assign

  Gdk::Color rainbowColorCounter(double, double, double);

  ///Changes the width of arc(s) according to the given map.

  ///\param mapname is the name of the map which contains the values to be set

  ///\param arc if it is given, only the width of the given arc will be set, instead of all of them.

  int changeArcWidth (std::string mapname, Arc arc=INVALID);

  ///Resets width of arc(s) to the default value

  ///\param arc if it is given, only the width of the

  ///given arc will be reset, instead of all of them.

  int resetArcWidth (Arc arc=INVALID);

  ///Changes the color of arc(s) according to the given map.

  ///\param mapname is the name of the map which contains the new values

  ///\param arc if it is given, only the color of the given arc will be set, instead of all of them.

  int changeArcColor (std::string mapname, Arc arc=INVALID);

  ///Resets color of arc(s) to the default value

  ///\param arc if it is given, only the color of the

  ///given arc will be reset, instead of all of them.

  int resetArcColor (Arc arc=INVALID);

  ///Changes the label of arc(s) according to the given map.

  ///\param mapname is the name of the map which contains the new values

  ///\param arc if it is given, only the label of the given arc will be set, instead of all of them.

  int changeArcText (std::string mapname, Arc arc=INVALID);

  ///Resets label of arc(s) to the default value

  ///\param arc if it is given, only the color of the

  ///given arc will be reset, instead of all of them.

  int resetArcText (Arc arc=INVALID);

  ///Changes the radius of node(s) according to the given map.

  ///\param mapname is the name of the map which contains the new values

  ///\param node if it is given, only the radius of the given node will be set, instead of all of them.

  int changeNodeRadius (std::string mapname, Node node=INVALID);

  ///Resets radius of node(s) to the default value

  ///\param node if it is given, only the radius of the

  ///given node will be reset, instead of all of them.

  int resetNodeRadius (Node node=INVALID);

  ///Changes the color of node(s) according to the given map.

  ///\param mapname is the name of the map which contains the new values

  ///\param node if it is given, only the color of the given node will be set, instead of all of them.

  int changeNodeColor (std::string mapname, Node node=INVALID);

  ///Resets color of node(s) to the default value

  ///\param node if it is given, only the color of the

  ///given node will be reset, instead of all of them.

  int resetNodeColor (Node node=INVALID);

  ///Changes the label of node(s) according to the given map.

  ///\param mapname is the name of the map which contains the new values

  ///\param node if it is given, only the label of the given node will be set, instead of all of them.

  int changeNodeText (std::string mapname, Node node=INVALID);

  ///Resets label of node(s) to the default value

  ///\param node if it is given, only the label of the

  ///given node will be reset, instead of all of them.

  int resetNodeText (Node node=INVALID);

  ///This function is called, when any of the displayed attributes have to be updated, or changed

  ///\param itisarc if true, arc property has to be changed, else node property

  ///\param prop the id of property that has to changed or updated

  void propertyChange(bool itisarc, int prop);

  ///updates the given property

  ///\param arc if it is not INVALID, only the property of the given arc will be updated, instead of all of them

  ///\param prop the property to update

  void propertyUpdate(Arc arc, int prop);

  ///updates the given property

  ///\param node if it is not INVALID, only the property of the given node will be updated, instead of all of them

  ///\param prop the property to update

  void propertyUpdate(Node node, int prop);

  ///updates all the property for the given arc

  void propertyUpdate(Arc);

  ///updates all the property for the given node

  void propertyUpdate(Node);

  ///Callback for 'ViewZoomIn' action.

  virtual void zoomIn();

  ///Callback for 'ViewZoomOut' action.

  virtual void zoomOut();

  ///Callback for 'ViewZoomFit' action.

  virtual void zoomFit();

  ///Callback for 'ViewZoom100' action.

  virtual void zoom100();

  ///Sets the scroll region of the convas to the bounding box of the digraph.

  void updateScrollRegion();

  ///This function changes the tool in the digraph-editor's hand

  void changeEditorialTool(int);

protected:

  //maximizing, minimizing, restoring window, etc.

  virtual bool on_expose_event(GdkEventExpose *);

private:

  ///This function is responsible for the correct

  ///reaction of any action happened in the territory

  ///of the canvas

  ///DEPRECATED!!!!

  bool eventHandler(GdkEvent* e, Node n);

  ///actual event handler

  ///

  ///Actual event handler should be stored, to be able to disconnect it and later reconnect it.

  sigc::connection actual_handler;

  ///event handler for the case when move-tool is active

  bool moveEventHandler(GdkEvent*);

  ///event handler for the case when create_node-tool is active

  bool createNodeEventHandler(GdkEvent*);

  ///event handler for the case when create_arc-tool is active

  bool createArcEventHandler(GdkEvent*);

  ///event handler for the case when eraser-tool is active

  bool eraserEventHandler(GdkEvent*);

  ///event handler for the case when map editor tool is active

  bool mapEditEventHandler(GdkEvent*);

  ///event handler for the case when user scrolls the mouse

  bool scrollEventHandler(GdkEvent*);

private:

  ///moves node according to the given parameters

  void moveNode(double, double,  Gnome::Canvas::Item * item=NULL, Node node=INVALID);

public:

  ///Moves the text to new place

  void textReposition(XY);

  ///Activates an arc belonging to an ArcBase

  ///After we have activated an arc this way,

  ///the GDC object will know, which arc is under forming

  ///therefore it can redraw the necessary elements on the canvas,

  ///for example the text belonging to the \ref ArcBase can be

  ///redrawn (\ref textReposition).

  void toggleArcActivity(ArcBase*, bool);

public:

  ///Returns the actual tool in hand

  int getActualTool();

  ///Sets node representation settings

  void setView(bool, bool, double, double);

  ///Gets node representation settings

  void getView(bool &, bool &, double&, double&);

  ///draws the digraph

  ///Called when opening a file.

  void drawDigraph();

  ///Clears the canvas

  ///It achieves this by deleting all data

  ///structure used to help handle the displayed digraph.

  void clear();

  ///creates a new Nodemap

  ///\param init initial value of the map

  ///\param mapname name of new map

  int addNewNodeMap(double init,std::string mapname);

  ///creates a new Arcmap

  ///\param init initial value of the map

  ///\param mapname name of new map

  int addNewArcMap(double init,std::string mapname);

  void reDesignDigraph();

  ///Show whether the digraph is already drawn.

  bool is_drawn;

private:

  ///Deletes the given element.

  void deleteItem(Node);

  ///Deletes the given element.

  void deleteItem(Arc);

private:

  ///Map of nodes of digraph

  Digraph::NodeMap<Gnome::Canvas::Ellipse *> nodesmap;

  ///Map of arcs of digraph

  Digraph::ArcMap<ArcBase*> arcsmap;

  ///Map of texts to write on arcs

  Digraph::ArcMap<Gnome::Canvas::Text *> arctextmap;

  ///Map of texts to write on nodes

  Digraph::NodeMap<Gnome::Canvas::Text *> nodetextmap;

  ///Group of digraphical elements of displayed_graph

  Gnome::Canvas::Group displayed_graph;

private:

  ///Indicates whether the button of mouse is pressed or not

  int isbutton;

  ///Stores the actual tool in hand

  int actual_tool;

  ///At this location was the mousebutton pressed.

  ///It helps to calculate the distance of dragging.

  double clicked_x, clicked_y;

  ///Remembers which Gnome::Canvas::Item was pressed.

  ///this variable is needed, to work on it after selection

  Gnome::Canvas::Item * active_item;

  ///Remembers which Gnome::Canvas::Item was pressed.

  ///this variable is used at arc creation, it will

  ///be the secondly selected node. No local variable

  ///can be used for this purpose inside the function,

  ///because the node selected by button press, and

  ///the arc is created by button release. Both of

  ///them is different function call.

  Gnome::Canvas::Item * target_item;

  ///selected node (for any editing)

  Node active_node;

  ///selected arc (for any editing)

  Arc active_arc;

  ///the arc that is selected by clicking on the red arrow in the middle of it

  ///This arc is stored only for the purpose of reshape it.

  ///That is why it is selected in a different manner.

  Arc forming_arc;

  ///Map displayed by label can be edited.

  std::string nodemap_to_edit;

  ///Map displayed by label can be edited.

  std::string arcmap_to_edit;

  static const int zoom_step = 5;

  ///Is node radius autoscaled

  bool autoscale;

  ///Should we track zoomfactor changes

  bool zoomtrack;

  ///to store the zoom factor when it was "fixed"

  double fixed_zoom_factor;

  ///Node radius size

  double radius_size;

  ///Arc width

  double arc_width;

  ///Was redesign run on this digraph already?

  ///

  ///If not, the layout will be modified randomly

  ///to avoid frozen layout because of wrong

  ///initial state

  bool was_redesigned;

private:

  ///reference to the container, in which the canvas is

  NoteBookTab & mytab;

  XY calcArrowPos(XY, XY, XY, XY, int);

  bool background_set;

  Glib::RefPtr<Gdk::Pixbuf> refBackground;

  Gnome::Canvas::Pixbuf *background;

public:

  void setBackground();

};

#endif //GRAPH_DISPLAYER_CANVAS_H