#include <broken_edge.h>

 #include <lemon/xy.h>

 #include <math.h>

 BrokenEdge::BrokenEdge(Gnome::Canvas::Group & g, Gnome::Canvas::Points p) : Line(g), isbutton(false)

 {

   my_points=new Gnome::Art::Point[3];

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

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

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

   set_points(p);

 }

 BrokenEdge::~BrokenEdge()

 {

   if(arrow)delete(arrow);

 }

 void BrokenEdge::set_points(Gnome::Canvas::Points p)

 {

   bool set_arrow=false;

   if(p.size()==2)

     {

       set_arrow=true;

       Gnome::Canvas::Points points_with_center;

       points_with_center.push_back(my_points[0]=p[0]);

       points_with_center.push_back(my_points[1]=Gnome::Art::Point( (p[0].get_x()+p[1].get_x())/2+0 , (p[0].get_y()+p[1].get_y())/2 )+0 );

       points_with_center.push_back(my_points[2]=p[1]);

       property_points().set_value(points_with_center);

     }  

   if(p.size()==3)

     {

       set_arrow=true;

       property_points().set_value(p);

       for(int i=0;i<3;i++)

 	{

 	  my_points[i]=p[i];

 	}

     }

   if(set_arrow)

     {

       //calculating coordinates of the direction indicator arrow

       xy<gdouble> target( my_points[2].get_x(), my_points[2].get_y() );

       xy<gdouble> center( my_points[1].get_x(), my_points[1].get_y() );

       xy<gdouble> unit_vector_in_dir(target-center);

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

       unit_vector_in_dir/=sqrt( unit_vector_in_dir.normSquare() );

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

       xy<gdouble> 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<gdouble> bl (center - unit_vector_in_dir * 3 * size + unit_norm_vector * size );

       xy<gdouble> br (center - unit_vector_in_dir * 3 * size - unit_norm_vector * size );

       xy<gdouble> ccl(center + unit_vector_in_dir *  size + unit_norm_vector * size );

       xy<gdouble> ccr(center + unit_vector_in_dir *  size - unit_norm_vector * size );

       xy<gdouble> cl (center + unit_vector_in_dir *  size + unit_norm_vector * 2 * size );

       xy<gdouble> cr (center + unit_vector_in_dir *  size - unit_norm_vector * 2 * size );

       xy<gdouble> 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 BrokenEdge::edge_former_event_handler(GdkEvent* e)

 {

   switch(e->type)

     {

     case GDK_BUTTON_PRESS:

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

       clicked_x=e->button.x;

       clicked_y=e->button.y;

       isbutton=true;

       break;

     case GDK_BUTTON_RELEASE:

       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;

 	  points_new.push_back(my_points[0]);

 	  points_new.push_back(my_points[1]=Gnome::Art::Point(my_points[1].get_x()+dx,my_points[1].get_y()+dy));

 	  points_new.push_back(my_points[2]);

 	  set_points(points_new);

 	  clicked_x=e->motion.x;

 	  clicked_y=e->motion.y;

 	}

     default: break;

     }

   return true;

 }