#include <graph_displayer_canvas.h>

 #include <math.h>

 GraphDisplayerCanvas::GraphDisplayerCanvas(Graph & gr, CoordinatesMap & cm, MapStorage & ms):g(gr),nodesmap(g),edgesmap(g),edgetextmap(g),displayed_graph(*(root()), 0, 0),mapstorage(ms),isbutton(false),active_item(NULL)

 {

   //set_center_scroll_region(true);

   //first edges are drawn, to hide joining with nodes later

   for (EdgeIt i(g); i!=INVALID; ++i)

   {

     //drawing green lines, coordinates are from cm

     Gnome::Canvas::Points coos;

     coos.push_back(Gnome::Art::Point(cm[g.source(i)].x,cm[g.source(i)].y));

     coos.push_back(Gnome::Art::Point(cm[g.target(i)].x,cm[g.target(i)].y));

     edgesmap[i]=new Gnome::Canvas::Line(displayed_graph, coos);

     *(edgesmap[i]) << Gnome::Canvas::Properties::fill_color("green");

     edgesmap[i]->property_width_pixels().set_value(10);    

     //initializing edge-text as well, to empty string

     double x1, x2, y1, y2;

     edgesmap[i]->get_bounds(x1, y1, x2, y2);

     edgetextmap[i]=new Gnome::Canvas::Text(displayed_graph,(x1+x2)/2, (y1+y2)/2, "");

     edgetextmap[i]->property_fill_color().set_value("black");

   }

   //afterwards nodes come to be drawn

   NodeIt i(g);

   int maxx=0, maxy=0, minx=(int)cm[i].x, miny=(int)cm[i].y;

   for (; i!=INVALID; ++i)

   {

     //minimum and maximum is gathered to be able to zoom to the graph correctly (whole figure should be seen)

     if(cm[i].x>maxx)maxx=(int)cm[i].x;

     if(cm[i].y>maxy)maxy=(int)cm[i].y;

     if(cm[i].x<minx)minx=(int)cm[i].x;

     if(cm[i].y<miny)miny=(int)cm[i].y;

     //drawing bule nodes, with black line around them

     nodesmap[i]=new Gnome::Canvas::Ellipse(displayed_graph, cm[i].x-20, cm[i].y-20, cm[i].x+20, cm[i].y+20);

     *(nodesmap[i]) << Gnome::Canvas::Properties::fill_color("blue");

     *(nodesmap[i]) << Gnome::Canvas::Properties::outline_color("black");

     (nodesmap[i])->signal_event().connect(sigc::bind(sigc::mem_fun(*this, &GraphDisplayerCanvas::event_handler),i));

   }

 /*

   //setting zoom to be able to see the whole graph on the canvas

   double biggest_x=(abs(maxx)>abs(minx))?(abs(maxx)+80):(abs(minx)+80);

   double biggest_y=(abs(maxy)>abs(miny))?(abs(maxy)+80):(abs(miny)+80);

   set_pixels_per_unit((biggest_x>biggest_y)?(WIN_WIDTH/biggest_x/2):(WIN_HEIGHT/biggest_y/2));

   std::cout<<abs(maxx)<<" "<<abs(minx)<<" big x "<<biggest_x<<" "<<abs(maxy)<<" "<<abs(miny)<<" big y "<<biggest_y<<std::endl;

   std::cout<<maxx<<" "<<minx<<" big x "<<biggest_x<<" "<<maxy<<" "<<miny<<" big y "<<biggest_y<<std::endl;

   std::cout<<"dx "<<(maxx-minx)<<" dy "<<(maxy-miny)<<" xrate "<<((maxx-minx)/WIN_WIDTH)<<" yrate "<<((maxy-miny)/WIN_HEIGHT)<<std::endl;

 */

   updateScrollRegion();

 }

 GraphDisplayerCanvas::~GraphDisplayerCanvas()

 {

   //writing out the end state of the graph

   //\todo all the maps has to be write out!

   Graph::NodeMap <int> id(g);

   Graph::NodeMap <double> xc(g);

   Graph::NodeMap <double> yc(g);

   int j=1;

   for (NodeIt i(g); i!=INVALID; ++i)

   {

     double x1,y1,x2,y2;

     nodesmap[i]->get_bounds(x1, y1, x2, y2);

     id[i]=j++;

     xc[i]=(x1+x2)/2;

     yc[i]=(y1+y2)/2;

   }

   GraphWriter<Graph> writer(std::cout,g);

   writer.writeNodeMap("id", id);

   writer.writeNodeMap("coordinates_x", xc);

   writer.writeNodeMap("coordinates_y", yc);

   writer.run();

 }

 int GraphDisplayerCanvas::changeLineWidth (std::string mapname)

 {

   for (EdgeIt i(g); i!=INVALID; ++i)

   {

     int w=(int)(*(mapstorage.edgemap_storage)[mapname])[i];

     edgesmap[i]->property_width_pixels().set_value(w);

   }

   return 0;

 };

 int GraphDisplayerCanvas::changeColor (std::string mapname)

 {  

   //function maps the range of the maximum and

   //the minimum of the nodemap to the range of

   //green in RGB

   for (EdgeIt i(g); i!=INVALID; ++i)

   {

     double w=(*(mapstorage.edgemap_storage)[mapname])[i];

     double max=mapstorage.maxOfEdgeMap(mapname);

     double min=mapstorage.minOfEdgeMap(mapname);

     //std::cout<<w<<" "<<max<<" "<<min<<" "<<100*(w-min)/(max-min)<<std::endl;

     Gdk::Color color;

     if(max!=min)

     {

       color.set_rgb_p (0, 100*(w-min)/(max-min), 0);

     }

     else

     {

       color.set_rgb_p (0, 100, 0);

     }

     edgesmap[i]->property_fill_color_gdk().set_value(color);

   }

   return 0;

 };

 int GraphDisplayerCanvas::changeText (std::string mapname)

 {

   //the number in the map will be written on the edge

   //EXCEPT when the name of the map is Text, because

   //in that case empty string will be written, because

   //that is the deleter map

   //\todo isn't it a bit woodcutter?

   for (EdgeIt i(g); i!=INVALID; ++i)

   {

     if(mapname!="Text")

     {

       double number=(*(mapstorage.edgemap_storage)[mapname])[i];

       int length=(int)(floor(log(number)/log(10)))+1;

       int maxpos=(int)(pow(10,length-1));

       int strl=length+1+RANGE;

       char * str=new char[strl];

       str[length]='.';

       str[strl]='\0';

       for(int j=0;j<strl;j++)

       {

 	if(j!=length)

         {

 	  int digit=(int)(number/maxpos);

 	  str[j]=(digit+'0');

 	  number-=digit*maxpos;

 	  number*=10;

         }

       }

       edgetextmap[i]->property_text().set_value(str);

     }

     else

     {

       edgetextmap[i]->property_text().set_value("");

     }

   }

   return 0;

 };

 bool GraphDisplayerCanvas::event_handler(GdkEvent* e, Node n)

 {

   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;

       active_item=(get_item_at(e->button.x, e->button.y));

       isbutton=true;

       break;

     case GDK_BUTTON_RELEASE:

       isbutton=false;

       active_item=NULL;

       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;

         active_item->move(dx, dy);

         clicked_x=e->motion.x;

         clicked_y=e->motion.y;

 	//all the edges connected to the moved point has to be redrawn

         EdgeIt e;

         g.firstOut(e,n);

         for(;e!=INVALID;g.nextOut(e))

         {

             Gnome::Canvas::Points coos;

             double x1, x2, y1, y2;

             nodesmap[g.source(e)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             nodesmap[g.target(e)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             edgesmap[e]->property_points().set_value(coos);

 	    edgesmap[e]->get_bounds(x1, y1, x2, y2);

 	    edgetextmap[e]->property_x().set_value((x1+x2)/2);

 	    edgetextmap[e]->property_y().set_value((y1+y2)/2);

         }

         g.firstIn(e,n);

         for(;e!=INVALID;g.nextIn(e))

         {

             Gnome::Canvas::Points coos;

             double x1, x2, y1, y2;

             nodesmap[g.source(e)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             nodesmap[g.target(e)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             edgesmap[e]->property_points().set_value(coos);

 	    edgesmap[e]->get_bounds(x1, y1, x2, y2);

 	    edgetextmap[e]->property_x().set_value((x1+x2)/2);

 	    edgetextmap[e]->property_y().set_value((y1+y2)/2);

         }

       }

     default: break;

   }

   return true;

 }

 bool GraphDisplayerCanvas::on_expose_event(GdkEventExpose *event)

 {

   Gnome::Canvas::CanvasAA::on_expose_event(event);

   //usleep(10000);

   //rezoom();

   return true;

 }

 void GraphDisplayerCanvas::zoomIn()

 {

   set_pixels_per_unit(

       (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());

 }

 void GraphDisplayerCanvas::zoomOut()

 {

   set_pixels_per_unit(

       (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());

 }

 void GraphDisplayerCanvas::zoomFit()

 {

   // get the height and width of the canvas

   Gtk::Allocation a = get_allocation();

   int aw = a.get_width();

   int ah = a.get_height();

   // add some space

   aw -= 5; if (aw < 0) aw = 0;

   ah -= 5; if (ah < 0) ah = 0;

   //std::cout << "aw=" << aw << " ah=" << ah << std::endl;

   // get the bounding box of the graph

   set_pixels_per_unit(1.0); // I don't really understand why this is necessary

   double wx1, wy1, wx2, wy2;

   double cx1, cy1, cx2, cy2;

   Gnome::Canvas::Item* pCanvasItem = root();

   pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);

   //std::cout << "root bounds: " << wx1 << " " << wy1 << " " << wx2 << " " << wy2 << std::endl;

   w2c(wx1, wy1, cx1, cy1);

   w2c(wx2, wy2, cx2, cy2);

   //std::cout << "root bounds (c): " << cx1 << " " << cy1 << " " << cx2 << " " << cy2 << std::endl;

   //std::cout << "cx2 - cx1=" << fabs(cx2 - cx1) << " cy2 - cy1=" << fabs(cy2 - cy1) << std::endl;

   // fit the graph to the window

   double ppu1 = (double) aw / fabs(cx2 - cx1);

   double ppu2 = (double) ah / fabs(cy2 - cy1);

   //std::cout << "ppu1=" << ppu1 << " ppu2=" << ppu2 << std::endl;

   (ppu1 < ppu2) ? set_pixels_per_unit(ppu1) : set_pixels_per_unit(ppu2);

 }

 void GraphDisplayerCanvas::zoom100()

 {

   set_pixels_per_unit(1.0);

 }

 void GraphDisplayerCanvas::updateScrollRegion()

 {

   double wx1, wy1, wx2, wy2;

   int cx1, cy1, cx2, cy2;

   Gnome::Canvas::Item* pCanvasItem = root();

   pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);

   w2c(wx1, wy1, cx1, cy1);

   w2c(wx2, wy2, cx2, cy2);

   set_scroll_region(cx1, cy1, cx2, cy2);

 }