#include "graph_displayer_canvas.h"

 #include <cmath>

 GraphDisplayerCanvas::BrokenEdge::BrokenEdge(Gnome::Canvas::Group & g, Edge _edge, GraphDisplayerCanvas & gc) : Line(g), edge(_edge), gdc(gc), isbutton(false)

 {

   arrow=new Gnome::Canvas::Polygon(g);

   *arrow << Gnome::Canvas::Properties::fill_color("red");

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

   arrow->lower_to_bottom();

   draw();

 }

 GraphDisplayerCanvas::BrokenEdge::~BrokenEdge()

 {

   if(arrow)delete(arrow);

 }

 void GraphDisplayerCanvas::BrokenEdge::draw()

 {

   MapStorage& ms = gdc.mytab.mapstorage;

   // 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));

     property_points().set_value(points);

   }

   // update the arrow

   {

     //calculating coordinates of the direction indicator arrow

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

     XY center(ms.arrow_pos[edge]);

     XY unit_vector_in_dir(target-center);

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

     //       std::cout << target << " - " << center << " = " << unit_vector_in_dir << "    / " <<unit_vector_in_dir.normSquare() ;

     unit_vector_in_dir/=length;

     //       std::cout << " = " << unit_vector_in_dir << std::endl;

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

     //       std::cout << unit_norm_vector << std::endl;

     {      

       //       /\       // 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);

     //std::cout << bl << " " << br << " " << ccl << " "  << ccr << " " << cl << " " << cr << " " << top << std::endl;

     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);

   }

 }

 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(gdc.getActualTool()!=CREATE_NODE)

 	{

 	  gdc.toggleEdgeActivity(this, true);

 	  clicked_x=e->button.x;

 	  clicked_y=e->button.y;

 	  isbutton=true;

 	}

       break;

     case GDK_BUTTON_RELEASE:

       if(gdc.getActualTool()!=CREATE_NODE)

 	{

 	  gdc.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;

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

 	  draw();

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

 	  clicked_x=e->motion.x;

 	  clicked_y=e->motion.y;

 	}

     default: break;

     }

   return true;

 }