gui/broken_edge.cc
author deba
Fri, 14 Oct 2005 10:52:15 +0000
changeset 1721 c0f5e8401373
parent 1645 4a04bb856ac7
permissions -rw-r--r--
Named parameter for heap and cross ref
It needs some redesign
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#include "broken_edge.h"
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#include <cmath>
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BrokenEdge::BrokenEdge(Gnome::Canvas::Group & g, Gnome::Canvas::Points p, GraphDisplayerCanvas & gc) : Line(g), gdc(gc), isbutton(false)
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{
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  my_points=new Gnome::Art::Point[3];
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  arrow=new Gnome::Canvas::Polygon(g);
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  *arrow << Gnome::Canvas::Properties::fill_color("red");
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  arrow->signal_event().connect(sigc::mem_fun(*this, &BrokenEdge::edgeFormerEventHandler));
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  arrow->lower_to_bottom();
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  setPoints(p);
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}
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BrokenEdge::~BrokenEdge()
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{
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  if(arrow)delete(arrow);
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}
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void BrokenEdge::setPoints(Gnome::Canvas::Points p, bool move)
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{
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  bool set_arrow=false;
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  //red arrow losts its position-right button
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  if(!move)
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    {
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      if(p.size()==2)
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	{
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	  set_arrow=true;
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	  Gnome::Canvas::Points points_with_center;
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	  points_with_center.push_back(my_points[0]=p[0]);
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	  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 );
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	  points_with_center.push_back(my_points[2]=p[1]);
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	  property_points().set_value(points_with_center);
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	}  
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      if(p.size()==3)
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	{
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	  set_arrow=true;
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	  property_points().set_value(p);
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	  for(int i=0;i<3;i++)
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	    {
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	      my_points[i]=p[i];
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	    }
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	}
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    }
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  else
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    {
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      //arrow keeps its position-left button
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//       if(p.size()==2)
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//       	{
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//       	  Gnome::Canvas::Points points;
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//       	  my_points[0]=p[0];
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//       	  my_points[2]=p[1];
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//       	  for(int i=0;i<3;i++)
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//       	    {
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//       	      points.push_back(my_points[i]);
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//       	    }
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//       	  property_points().set_value(points);
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//       	}
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      set_arrow=true;
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      //////////////////////////////////////////////////////////////////////////////////////////////////////
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      /////////// keeps shape-with scalar multiplication - version 2.
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      //////////////////////////////////////////////////////////////////////////////////////////////////////
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      if(p.size()==2)
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      	{
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	  //old vector from one to the other node - a
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	  xy<double> a_v(my_points[2].get_x()-my_points[0].get_x(),my_points[2].get_y()-my_points[0].get_y());
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	  //new vector from one to the other node - b
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	  xy<double> b_v(p[1].get_x()-p[0].get_x(),p[1].get_y()-p[0].get_y());
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	  double absa=sqrt(a_v.normSquare());
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	  double absb=sqrt(b_v.normSquare());
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	  //old vector from one node to the breakpoint - c
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	  xy<double> c_v(my_points[1].get_x()-my_points[0].get_x(),my_points[1].get_y()-my_points[0].get_y());
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	  //unit vector with the same direction to a_v
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	  xy<double> a_v_u(a_v.x/absa,a_v.y/absa);
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	  //normal vector of unit vector with the same direction to a_v
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	  xy<double> a_v_u_n(((-1)*a_v_u.y),a_v_u.x);
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	  //unit vector with the same direction to b_v
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	  xy<double> b_v_u(b_v.x/absb,b_v.y/absb);
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	  //normal vector of unit vector with the same direction to b_v
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	  xy<double> b_v_u_n(((-1)*b_v_u.y),b_v_u.x);
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	  //vector c in a_v_u and a_v_u_n co-ordinate system
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	  xy<double> c_a(c_v*a_v_u,c_v*a_v_u_n);
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	  //new vector from one node to the breakpoint - d - we have to calculate this one
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	  xy<double> d_v=absb/absa*(c_a.x*b_v_u+c_a.y*b_v_u_n);
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	  my_points[1]=Gnome::Art::Point(d_v.x+p[0].get_x(),d_v.y+p[0].get_y());
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      	  my_points[0]=p[0];
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      	  my_points[2]=p[1];
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	  Gnome::Canvas::Points points;
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	  for(int i=0;i<3;i++)
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	    {
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	      points.push_back(my_points[i]);
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	    }
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	  property_points().set_value(points);
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	}
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    }
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  if(set_arrow)
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    {
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      //calculating coordinates of the direction indicator arrow
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      xy<gdouble> target( my_points[2].get_x(), my_points[2].get_y() );
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      xy<gdouble> center( my_points[1].get_x(), my_points[1].get_y() );
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      xy<gdouble> unit_vector_in_dir(target-center);
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      //       std::cout << target << " - " << center << " = " << unit_vector_in_dir << "    / " <<unit_vector_in_dir.normSquare() ;
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      unit_vector_in_dir/=sqrt( unit_vector_in_dir.normSquare() );
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      //       std::cout << " = " << unit_vector_in_dir << std::endl;
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      xy<gdouble> unit_norm_vector(0-unit_vector_in_dir.y, unit_vector_in_dir.x);
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      //       std::cout << unit_norm_vector << std::endl;
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      {      
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	//       /\       // top
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	//      /  \      //
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	//      -  -      // c(enter)l(eft), ccl, ccr, cr
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	//       ||       //
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	//       ||       // b(ottom)l, br
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      }
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      double size=3;
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      xy<gdouble> bl (center - unit_vector_in_dir * 3 * size + unit_norm_vector * size );
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      xy<gdouble> br (center - unit_vector_in_dir * 3 * size - unit_norm_vector * size );
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      xy<gdouble> ccl(center + unit_vector_in_dir *  size + unit_norm_vector * size );
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      xy<gdouble> ccr(center + unit_vector_in_dir *  size - unit_norm_vector * size );
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      xy<gdouble> cl (center + unit_vector_in_dir *  size + unit_norm_vector * 2 * size );
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      xy<gdouble> cr (center + unit_vector_in_dir *  size - unit_norm_vector * 2 * size );
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      xy<gdouble> top(center + unit_vector_in_dir * 3 * size);
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      //       std::cout << bl << " " << br << " " << ccl << " "  << ccr << " " << cl << " " << cr << " " << top << std::endl;
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      Gnome::Canvas::Points arrow_points;
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      arrow_points.push_back(Gnome::Art::Point( bl.x , bl.y  ) );
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      arrow_points.push_back(Gnome::Art::Point( br.x , br.y  ) );
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      arrow_points.push_back(Gnome::Art::Point( ccr.x, ccr.y ) );
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      arrow_points.push_back(Gnome::Art::Point( cr.x , cr.y  ) );
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      arrow_points.push_back(Gnome::Art::Point( top.x, top.y ) );
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      arrow_points.push_back(Gnome::Art::Point( cl.x , cl.y  ) );
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      arrow_points.push_back(Gnome::Art::Point( ccl.x, ccl.y ) );
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      arrow->property_points().set_value(arrow_points);
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    }
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}
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bool BrokenEdge::edgeFormerEventHandler(GdkEvent* e)
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{
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  switch(e->type)
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    {
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    case GDK_BUTTON_PRESS:
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      //we mark the location of the event to be able to calculate parameters of dragging
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      if(gdc.getActualTool()!=CREATE_NODE)
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	{
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	  gdc.toggleEdgeActivity(this, true);
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	  clicked_x=e->button.x;
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	  clicked_y=e->button.y;
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	  isbutton=true;
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	}
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      break;
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    case GDK_BUTTON_RELEASE:
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      if(gdc.getActualTool()!=CREATE_NODE)
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	{
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	  gdc.toggleEdgeActivity(this, false);
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	  isbutton=false;
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	}
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      break;
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    case GDK_MOTION_NOTIFY:
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      //we only have to do sg. if the mouse button is pressed
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      if(isbutton)
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	{
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	  //new coordinates will be the old values,
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	  //because the item will be moved to the
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	  //new coordinate therefore the new movement
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	  //has to be calculated from here
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	  double dx=e->motion.x-clicked_x;
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	  double dy=e->motion.y-clicked_y;
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	  Gnome::Canvas::Points points_new;
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	  points_new.push_back(my_points[0]);
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	  points_new.push_back(my_points[1]=Gnome::Art::Point(my_points[1].get_x()+dx,my_points[1].get_y()+dy));
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	  points_new.push_back(my_points[2]);
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	  setPoints(points_new);
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	  gdc.textReposition(xy<double>(my_points[1].get_x(),my_points[1].get_y()));
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	  clicked_x=e->motion.x;
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	  clicked_y=e->motion.y;
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	}
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    default: break;
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    }
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  return true;
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}
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xy<double> BrokenEdge::getArrowPos()
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{
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  xy<double> ret_val(my_points[1].get_x(),my_points[1].get_y());
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  return ret_val;
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}