diff -r e112465192dc -r eedecee61922 broken_edge.cc
--- a/broken_edge.cc	Thu Jul 28 15:54:53 2005 +0000
+++ b/broken_edge.cc	Thu Jul 28 17:01:40 2005 +0000
@@ -19,6 +19,7 @@
 void BrokenEdge::setPoints(Gnome::Canvas::Points p, bool move)
 {
   bool set_arrow=false;
+  //red arrow losts its position-right button
   if(!move)
     {
       if(p.size()==2)
@@ -42,11 +43,189 @@
     }
   else
     {
+      //arrow keeps its position-left button
+
+      //       if(p.size()==2)
+      // 	{
+      // 	  Gnome::Canvas::Points points;
+      // 	  my_points[0]=p[0];
+      // 	  my_points[2]=p[1];
+      // 	  for(int i=0;i<3;i++)
+      // 	    {
+      // 	      points.push_back(my_points[i]);
+      // 	    }
+      // 	  property_points().set_value(points);
+      // 	}
+
+      //////////////////////////////////////////////////////////////////////////////////////////////////////
+      /////////// kepps shape-with angles
+      //////////////////////////////////////////////////////////////////////////////////////////////////////
+
+
+//       //old vector from one to the other node
+//       xy<double> o_p2p(my_points[2].get_x()-my_points[0].get_x(),my_points[2].get_y()-my_points[0].get_y());
+//       //projection of the old vector to positive x axis
+//       xy<double> o_x_p2p(fabs(o_p2p.x),0);
+//       //length of p2p vector
+//       double o_l_p2p=sqrt( o_p2p.normSquare() );
+//       if(o_p2p.x<0)
+// 	{
+// 	  o_l_p2p*=-1;
+// 	}
+//       //length of projection of p2p vector
+//       double o_l_x_p2p=sqrt( o_x_p2p.normSquare() );
+//       //old angle of p2p vector to the x axis
+//       double o_a_p2p=acos(o_l_x_p2p/o_l_p2p);
+//       if(o_p2p.y>0)
+// 	{
+// 	  o_a_p2p=2*M_PI-o_a_p2p;
+// 	}
+
+//       //old vector from first node to the breakpoint
+//       xy<double> o_1b((my_points[1].get_x()-my_points[0].get_x()),(my_points[1].get_y()-my_points[0].get_y()));
+//       //projection of the old node-breakpoint vector to positive x axis
+//       xy<double> o_x_1b(fabs(o_1b.x),0);
+//       //length of 1b vector
+//       double o_l_1b=sqrt( o_1b.normSquare() );
+//       if(o_1b.x<0)
+// 	{
+// 	  o_l_1b*=-1;
+// 	}
+//       //length of projection of 1b vector
+//       double o_l_x_1b=sqrt( o_x_1b.normSquare() );
+//       //old angle of 1b vector to the x axis
+//       double o_a_1b=acos(o_l_x_1b/o_l_1b);
+//       if(o_1b.y>0)
+// 	{
+// 	  o_a_1b=2*M_PI-o_a_1b;
+// 	}
+
+//       if(p.size()==2)
+//       	{
+// 	  set_arrow=true;
+
+//       	  my_points[0]=p[0];
+//       	  my_points[2]=p[1];
+
+// 	  //new vector from one to the other node
+// 	  xy<double> n_p2p(my_points[2].get_x()-my_points[0].get_x(),my_points[2].get_y()-my_points[0].get_y());
+// 	  //projection of the new vector to positive x axis
+// 	  xy<double> n_x_p2p(fabs(n_p2p.x),0);
+// 	  //length of p2p vector
+// 	  double n_l_p2p=sqrt( n_p2p.normSquare() );
+// 	  if(n_p2p.x<0)
+// 	    {
+// 	      n_l_p2p*=-1;
+// 	    }
+// 	  //length of projection of p2p vector
+// 	  double n_l_x_p2p=sqrt( n_x_p2p.normSquare() );
+// 	  //new angle of p2p vector to the x axis
+// 	  double n_a_p2p=acos(n_l_x_p2p/n_l_p2p);
+// 	  if(n_p2p.y>0)
+// 	    {
+// 	      n_a_p2p=2*M_PI-n_a_p2p;
+// 	    }
+
+// 	  //new angle of 1b vector to the x axis
+// 	  double n_a_1b=o_a_1b+n_a_p2p-o_a_p2p;
+
+// 	  std::cout << " p2p regi: " << o_a_p2p/M_PI*180 << " uj: " << n_a_p2p/M_PI*180-(int)n_a_p2p/M_PI*180 << std::endl;
+// 	  std::cout << " 1b regi: " << o_a_1b/M_PI*180 << " uj: " << n_a_1b/M_PI*180-(int)n_a_1b/M_PI*180 << std::endl;
+
+// // 	  std::cout << o_p2p << " " << n_p2p << std::endl;
+
+// 	  if((n_a_1b>M_PI*3/2)||(n_a_1b<M_PI/2))
+// 	    {
+// 	      std::cout << "jobb terfel" << std::endl;
+// 	      my_points[1]=Gnome::Art::Point(p[0].get_x()+cos(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p,p[0].get_y()-sin(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p);
+// 	    }
+// 	  else if((n_a_1b<M_PI*3/2)&&(n_a_1b>M_PI/2))
+// 	    {
+// 	      std::cout << "bal terfel" << std::endl;
+// 	      my_points[1]=Gnome::Art::Point(p[0].get_x()-cos(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p,p[0].get_y()+sin(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p);
+// 	    }
+// 	  else
+// 	    {
+// 	      std::cout << "y tengely" << std::endl;
+// 	      double new_y=my_points[1].get_y();
+// 	      my_points[1]=Gnome::Art::Point(p[0].get_x()-cos(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p,new_y);
+// 	    }
+
+// 	  std::cout << "alap: " << p[0] << " eredeti hossz: " << o_l_1b << " nagy uj: " << n_l_p2p << " nagy regi: " << o_l_p2p << " a*b/c " << o_l_1b*n_l_p2p/o_l_p2p << " eredmeny: " << my_points[1] << std::endl;
+
+
+// // 	  if(o_1b.x*o_1b.y>0)
+// // 	    {
+// // 	      if(n_p2p.x>0)
+// // 		{
+// // 		  my_points[1]=Gnome::Art::Point(p[0].get_x()+cos(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p,p[0].get_y()+sin(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p);
+// // 		}
+// // 	      else
+// // 		{
+// // 		  my_points[1]=Gnome::Art::Point(p[0].get_x()-cos(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p,p[0].get_y()-sin(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p);
+// // 		}
+// // 	    }
+// // 	  else if(o_1b.x*o_1b.y<0)
+// // 	    {
+// // 	      if(n_p2p.x>0)
+// // 		{
+// // 		  my_points[1]=Gnome::Art::Point(p[0].get_x()+cos(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p,p[0].get_y()-sin(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p);
+// // 		}
+// // 	      else
+// // 		{
+// // 		  my_points[1]=Gnome::Art::Point(p[0].get_x()-cos(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p,p[0].get_y()+sin(n_a_1b)*o_l_1b*n_l_p2p/o_l_p2p);
+// // 		}
+// // 	    }
+// // 	  else
+// // 	    {
+// // 	    }
+
+      //////////////////////////////////////////////////////////////////////////////////////////////////////
+      /////////// kepps shape-with scalar multiplication
+      //////////////////////////////////////////////////////////////////////////////////////////////////////
+
       if(p.size()==2)
-	{
+      	{
+	  //old vector from one to the other node - a
+	  xy<double> a_v(my_points[2].get_x()-my_points[0].get_x(),my_points[2].get_y()-my_points[0].get_y());
+	  //new vector from one to the other node - b
+	  xy<double> b_v(p[1].get_x()-p[0].get_x(),p[1].get_y()-p[0].get_y());
+
+	  //old vector from one node to the breakpoint - c
+	  xy<double> c_v(my_points[1].get_x()-my_points[0].get_x(),my_points[1].get_y()-my_points[0].get_y());
+
+	  //new vector from one node to the breakpoint - d - we have to calculate this one
+	  xy<double> d_v;
+
+	  //scalar product of a and b (old and new vector from first point to the other)
+	  double sab=a_v*b_v;
+	  //scalar product of c and d (old and new vector from first point to breakpoint)
+	  double scd=sab*c_v.normSquare()/a_v.normSquare();
+
+	  std::cout<<" a " << a_v<<" b " <<b_v<<" c " <<c_v<<" sab " <<sab<<" scd "<<scd<<std::endl;
+
+	  double a=c_v.normSquare();
+	  double b=2*scd*c_v.y;
+	  double c=scd*scd-b_v.normSquare()/a_v.normSquare()*c_v.normSquare()*c_v.x*c_v.x;
+
+	  std::cout<<" a " << a<<" b " <<b<<" c " <<c<<std::endl;
+
+	  d_v.y=(-b-sqrt(b*b-4*a*c))/2/a;
+
+	  if(c_v.x!=0)
+	    {
+	      d_v.x=(scd-c_v.y*d_v.y)/c_v.x;
+	    }
+	  else
+	    {
+	      d_v.x=my_points[1].get_x();
+	    }
+
+	  std::cout<<" d " << d_v<<std::endl;
+
+	  my_points[1]=Gnome::Art::Point(d_v.x+p[0].get_x(),d_v.y+p[0].get_y());
+
 	  Gnome::Canvas::Points points;
-	  my_points[0]=p[0];
-	  my_points[2]=p[1];
 	  for(int i=0;i<3;i++)
 	    {
 	      points.push_back(my_points[i]);
@@ -54,7 +233,6 @@
 	  property_points().set_value(points);
 	}
     }
-
   if(set_arrow)
     {
       //calculating coordinates of the direction indicator arrow