#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;

}