/* -*- 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.

 *

 */

#include "graph_displayer_canvas.h"

#include <cmath>

GraphDisplayerCanvas::EdgeBase::EdgeBase(Gnome::Canvas::Group& _group, Edge _edge, GraphDisplayerCanvas& _canvas) : 

  Gnome::Canvas::Group(_group), edge(_edge), canvas(_canvas), arrow(*this)

{

  arrow.property_fill_color().set_value("red");

  arrow.lower_to_bottom();

  lower_to_bottom();

}

GraphDisplayerCanvas::EdgeBase::~EdgeBase()

{

}

void GraphDisplayerCanvas::EdgeBase::drawArrow(XY unit_vector_in_dir)

{

  MapStorage& ms = canvas.mytab.mapstorage;

  XY center(ms.arrow_pos[edge]);

  XY unit_norm_vector(0-unit_vector_in_dir.y, unit_vector_in_dir.x);

  //       /\       // top

  //      /  \      //

  //      -  -      // c(enter)l(eft), ccl, ccr, cr

  //       ||       //

  //       ||       // b(ottom)l, br

  double size=3;

  XY bl (center - unit_vector_in_dir * 3 * size + unit_norm_vector * size );

  XY br (center - unit_vector_in_dir * 3 * size - unit_norm_vector * size );

  XY ccl(center + unit_vector_in_dir *  size + unit_norm_vector * size );

  XY ccr(center + unit_vector_in_dir *  size - unit_norm_vector * size );

  XY cl (center + unit_vector_in_dir *  size + unit_norm_vector * 2 * size );

  XY cr (center + unit_vector_in_dir *  size - unit_norm_vector * 2 * size );

  XY top(center + unit_vector_in_dir * 3 * size);

  Gnome::Canvas::Points arrow_points;

  arrow_points.push_back(Gnome::Art::Point( bl.x , bl.y  ) );

  arrow_points.push_back(Gnome::Art::Point( br.x , br.y  ) );

  arrow_points.push_back(Gnome::Art::Point( ccr.x, ccr.y ) );

  arrow_points.push_back(Gnome::Art::Point( cr.x , cr.y  ) );

  arrow_points.push_back(Gnome::Art::Point( top.x, top.y ) );

  arrow_points.push_back(Gnome::Art::Point( cl.x , cl.y  ) );

  arrow_points.push_back(Gnome::Art::Point( ccl.x, ccl.y ) );

  arrow.property_points().set_value(arrow_points);

}

GraphDisplayerCanvas::BrokenEdge::BrokenEdge(Gnome::Canvas::Group & g,

    Edge _edge, GraphDisplayerCanvas & gc) : EdgeBase(g, _edge, gc),

  isbutton(false), line(*this)

{

  arrow.signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::BrokenEdge::edgeFormerEventHandler));

  line.property_fill_color().set_value("green");

  line.property_width_units().set_value(10);    

  line.lower_to_bottom();

  draw();

}

GraphDisplayerCanvas::BrokenEdge::~BrokenEdge()

{

}

void GraphDisplayerCanvas::BrokenEdge::draw()

{

  MapStorage& ms = canvas.mytab.mapstorage;

  //calculating coordinates of the direction indicator arrow

  XY head(ms.coords[ms.graph.target(edge)]);

  XY center(ms.arrow_pos[edge]);

  XY unit_vector_in_dir(head-center);

  double length=sqrt( unit_vector_in_dir.normSquare() );

  if(length!=0)

    {

      unit_vector_in_dir/=length;

    }

  // update the arrow

  drawArrow(unit_vector_in_dir);

  // update the edge

  Gnome::Canvas::Points points;

  Node source = ms.graph.source(edge);

  Node target = ms.graph.target(edge);

  points.push_back(Gnome::Art::Point(ms.coords[source].x,

        ms.coords[source].y));

  points.push_back(Gnome::Art::Point(ms.arrow_pos[edge].x,

        ms.arrow_pos[edge].y));

  points.push_back(Gnome::Art::Point(ms.coords[target].x,

        ms.coords[target].y));

  line.property_points().set_value(points);

}

bool GraphDisplayerCanvas::BrokenEdge::edgeFormerEventHandler(GdkEvent* e)

{

  switch(e->type)

  {

    case GDK_BUTTON_PRESS:

      //we mark the location of the event to be able to calculate parameters

      //of dragging

      if(canvas.getActualTool()!=CREATE_NODE)

      {

        canvas.toggleEdgeActivity(this, true);

        clicked_x=e->button.x;

        clicked_y=e->button.y;

        isbutton=true;

      }

      break;

    case GDK_BUTTON_RELEASE:

      if(canvas.getActualTool()!=CREATE_NODE)

      {

        canvas.toggleEdgeActivity(this, false);

        isbutton=false;

      }

      break;

    case GDK_MOTION_NOTIFY:

      //we only have to do sg. if the mouse button is pressed

      if(isbutton)

      {

        //new coordinates will be the old values,

        //because the item will be moved to the

        //new coordinate therefore the new movement

        //has to be calculated from here

        double dx=e->motion.x-clicked_x;

        double dy=e->motion.y-clicked_y;

        Gnome::Canvas::Points points_new;

        canvas.mytab.mapstorage.arrow_pos.set(edge, canvas.mytab.mapstorage.arrow_pos[edge] + XY(dx, dy));

        draw();

        canvas.textReposition(canvas.mytab.mapstorage.arrow_pos[edge]);

        clicked_x=e->motion.x;

        clicked_y=e->motion.y;

      }

    default: break;

  }

  return true;

}

void GraphDisplayerCanvas::BrokenEdge::setLineWidth(int w)

{

  line.property_width_units().set_value(w);

}

void GraphDisplayerCanvas::BrokenEdge::setFillColor(Gdk::Color c)

{

  line.property_fill_color_gdk().set_value(c);

}

GraphDisplayerCanvas::LoopEdge::LoopEdge(Gnome::Canvas::Group& _group,

    Edge _edge, GraphDisplayerCanvas& _canvas) :

  EdgeBase(_group, _edge, _canvas), line(*this), isbutton(false)

{

  arrow.signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::LoopEdge::edgeFormerEventHandler));

  line.property_outline_color().set_value("green");

  line.property_width_units().set_value(10);

  line.lower_to_bottom();

  draw();

}

GraphDisplayerCanvas::LoopEdge::~LoopEdge()

{

}

void GraphDisplayerCanvas::LoopEdge::draw()

{

  MapStorage& ms = canvas.mytab.mapstorage;

  Node node = ms.graph.source(edge);

  XY center = (ms.coords[node] + ms.arrow_pos[edge]) / 2.0;

  XY unit_vector_in_dir(rot90(center - ms.arrow_pos[edge]));

  double length = sqrt(unit_vector_in_dir.normSquare());

  unit_vector_in_dir /= length;

  drawArrow(unit_vector_in_dir);

  double radius =

    sqrt((ms.arrow_pos[edge] - ms.coords[node]).normSquare()) / 2.0;

  XY p1 = center + XY(-radius,  radius);

  XY p2 = center + XY( radius, -radius);

  line.property_x1().set_value(p1.x);

  line.property_y1().set_value(p1.y);

  line.property_x2().set_value(p2.x);

  line.property_y2().set_value(p2.y);

}

void GraphDisplayerCanvas::LoopEdge::setLineWidth(int w)

{

  line.property_width_units().set_value(w);

}

void GraphDisplayerCanvas::LoopEdge::setFillColor(Gdk::Color c)

{

  line.property_outline_color_gdk().set_value(c);

}

bool GraphDisplayerCanvas::LoopEdge::edgeFormerEventHandler(GdkEvent* e)

{

  switch(e->type)

  {

    case GDK_BUTTON_PRESS:

      if(canvas.getActualTool()!=CREATE_NODE)

      {

        canvas.toggleEdgeActivity(this, true);

        isbutton=true;

      }

      break;

    case GDK_BUTTON_RELEASE:

      if(canvas.getActualTool()!=CREATE_NODE)

      {

        canvas.toggleEdgeActivity(this, false);

        isbutton=false;

      }

      break;

    case GDK_MOTION_NOTIFY:

      if(isbutton)

      {

        canvas.mytab.mapstorage.arrow_pos.set(edge, XY(e->motion.x, e->motion.y));

        draw();

        canvas.textReposition(canvas.mytab.mapstorage.arrow_pos[edge]);

      }

    default: break;

  }

  return true;

}