glemon: comparison graph_displayer

equal deleted inserted replaced

--1:000000000000
+:e00fe9396c80
+/* -*- C++ -*-
+*
+* This file is a part of LEMON, a generic C++ optimization library
+*
+* Copyright (C) 2003-2006
+* Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+* (Egervary Research Group on Combinatorial Optimization, EGRES).
+*
+* Permission to use, modify and distribute this software is granted
+* provided that this copyright notice appears in all copies. For
+* precise terms see the accompanying LICENSE file.
+*
+* This software is provided "AS IS" with no warranty of any kind,
+* express or implied, and with no claim as to its suitability for any
+* purpose.
+*
+*/
+#include <graph_displayer_canvas.h>
+#include <mapstorage.h>
+#include <nbtab.h>
+#include <cmath>
+#include <set>
+bool DigraphDisplayerCanvas::on_expose_event(GdkEventExpose *event)
+{
+Gnome::Canvas::CanvasAA::on_expose_event(event);
+//usleep(10000);
+//rezoom();
+return true;
+}
+void DigraphDisplayerCanvas::changeEditorialTool(int newtool)
+{
+if(actual_tool!=newtool)
+{
+actual_handler.disconnect();
+switch(actual_tool)
+{
+case CREATE_EDGE:
+{
+GdkEvent * generated=new GdkEvent();
+generated->type=GDK_BUTTON_RELEASE;
+generated->button.button=3;
+createArcEventHandler(generated);
+break;
+}
+case MAP_EDIT:
+{
+break;
+}
+default:
+break;
+}
+active_item=NULL;
+target_item=NULL;
+active_arc=INVALID;
+active_node=INVALID;
+actual_tool=newtool;
+switch(newtool)
+{
+case MOVE:
+actual_handler=signal_event().connect(sigc::mem_fun(*this, &DigraphDisplayerCanvas::moveEventHandler), false);
+break;
+case CREATE_NODE:
+actual_handler=signal_event().connect(sigc::mem_fun(*this, &DigraphDisplayerCanvas::createNodeEventHandler), false);
+break;
+case CREATE_EDGE:
+actual_handler=signal_event().connect(sigc::mem_fun(*this, &DigraphDisplayerCanvas::createArcEventHandler), false);
+break;
+case ERASER:
+actual_handler=signal_event().connect(sigc::mem_fun(*this, &DigraphDisplayerCanvas::eraserEventHandler), false);
+break;
+case MAP_EDIT:
+grab_focus();
+actual_handler=signal_event().connect(sigc::mem_fun(*this, &DigraphDisplayerCanvas::mapEditEventHandler), false);
+break;
+default:
+break;
+}
+}
+}
+int DigraphDisplayerCanvas::getActualTool()
+{
+return actual_tool;
+}
+bool DigraphDisplayerCanvas::scrollEventHandler(GdkEvent* e)
+{
+bool handled=false;
+if(e->type==GDK_SCROLL)
+{
+//pointer shows this win point before zoom
+XY win_coord(((GdkEventScroll*)e)->x, ((GdkEventScroll*)e)->y);
+//the original scroll settings
+int scroll_offset_x, scroll_offset_y;
+get_scroll_offsets(scroll_offset_x, scroll_offset_y);
+//pointer shows this canvas point before zoom
+XY canvas_coord;
+window_to_world(win_coord.x, win_coord.y, canvas_coord.x, canvas_coord.y);
+if(((GdkEventScroll*)e)->direction) //IN
+	{
+	  zoomIn();
+	}
+else
+	{
+	  zoomOut();
+	}
+//pointer shows this window point after zoom
+XY post_win_coord;
+world_to_window(canvas_coord.x, canvas_coord.y, post_win_coord.x, post_win_coord.y);
+//we have to add the difference between new and old window point to original scroll offset
+scroll_to(scroll_offset_x+(int)(post_win_coord.x-win_coord.x),scroll_offset_y+(int)(post_win_coord.y-win_coord.y));
+//no other eventhandler is needed
+handled=true;
+}
+return handled;
+}
+bool DigraphDisplayerCanvas::moveEventHandler(GdkEvent* e)
+{
+MapStorage& ms = *mytab.mapstorage;
+static Gnome::Canvas::Text *coord_text = 0;
+switch(e->type)
+{
+case GDK_BUTTON_PRESS:
+//we mark the location of the event to be able to calculate parameters of dragging
+window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
+active_item=(get_item_at(clicked_x, clicked_y));
+active_node=INVALID;
+for (NodeIt i(ms.digraph); i!=INVALID; ++i)
+{
+if(nodesmap[i]==active_item)
+{
+active_node=i;
+}
+}
+isbutton=e->button.button;
+break;
+case GDK_BUTTON_RELEASE:
+if (coord_text)
+{
+delete coord_text;
+coord_text = 0;
+}
+isbutton=0;
+active_item=NULL;
+active_node=INVALID;
+break;
+case GDK_MOTION_NOTIFY:
+//we only have to do sg. if the mouse button is pressed AND the click was on a node that was found in the set of nodes
+if(active_node!=INVALID)
+{
+ms.setModified();
+//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 new_x, new_y;
+window_to_world (e->motion.x, e->motion.y, new_x, new_y);
+double dx=new_x-clicked_x;
+double dy=new_y-clicked_y;
+moveNode(dx, dy);
+clicked_x=new_x;
+clicked_y=new_y;
+// reposition the coordinates text
+std::ostringstream ostr;
+ostr << "(" <<
+ms.getNodeCoords(active_node).x << ", " <<
+ms.getNodeCoords(active_node).y << ")";
+double radius =
+(nodesmap[active_node]->property_x2().get_value() -
+nodesmap[active_node]->property_x1().get_value()) / 2.0;
+if (coord_text)
+{
+coord_text->property_text().set_value(ostr.str());
+coord_text->property_x().set_value(
+ms.getNodeCoords(active_node).x + radius);
+coord_text->property_y().set_value(
+ms.getNodeCoords(active_node).y - radius);
+}
+else
+{
+coord_text = new Gnome::Canvas::Text(
+displayed_graph,
+ms.getNodeCoords(active_node).x + radius,
+ms.getNodeCoords(active_node).y - radius,
+ostr.str());
+coord_text->property_fill_color().set_value("black");
+coord_text->property_anchor().set_value(Gtk::ANCHOR_SOUTH_WEST);
+}
+}
+default: break;
+}
+return false;
+}
+XY DigraphDisplayerCanvas::calcArrowPos(XY moved_node_1, XY moved_node_2, XY fix_node, XY old_arrow_pos, int move_code)
+{
+switch(move_code)
+{
+case 1:
+return XY((moved_node_2.x + fix_node.x) / 2.0, (moved_node_2.y + fix_node.y) / 2.0);
+break;
+case 2:
+return old_arrow_pos;
+break;
+case 3:
+{
+//////////////////////////////////////////////////////////////////////////////////////////////////////
+/////////// keeps shape-with scalar multiplication - version 2.
+//////////////////////////////////////////////////////////////////////////////////////////////////////
+//old vector from one to the other node - a
+XY a_v(moved_node_1.x-fix_node.x,moved_node_1.y-fix_node.y);
+//new vector from one to the other node - b
+XY b_v(moved_node_2.x-fix_node.x,moved_node_2.y-fix_node.y);
+double absa=sqrt(a_v.normSquare());
+double absb=sqrt(b_v.normSquare());
+if ((absa == 0.0) || (absb == 0.0))
+{
+return old_arrow_pos;
+}
+else
+{
+//old vector from one node to the breakpoint - c
+XY c_v(old_arrow_pos.x-fix_node.x,old_arrow_pos.y-fix_node.y);
+//unit vector with the same direction to a_v
+XY a_v_u(a_v.x/absa,a_v.y/absa);
+//normal vector of unit vector with the same direction to a_v
+XY a_v_u_n(((-1)*a_v_u.y),a_v_u.x);
+//unit vector with the same direction to b_v
+XY b_v_u(b_v.x/absb,b_v.y/absb);
+//normal vector of unit vector with the same direction to b_v
+XY b_v_u_n(((-1)*b_v_u.y),b_v_u.x);
+//vector c in a_v_u and a_v_u_n co-ordinate system
+XY c_a(c_v*a_v_u,c_v*a_v_u_n);
+//new vector from one node to the breakpoint - d - we have to calculate this one
+XY d_v=absb/absa*(c_a.x*b_v_u+c_a.y*b_v_u_n);
+return XY(d_v.x+fix_node.x,d_v.y+fix_node.y);
+}
+break;
+}
+default:
+break;
+}
+}
+bool DigraphDisplayerCanvas::createNodeEventHandler(GdkEvent* e)
+{
+MapStorage& ms = *mytab.mapstorage;
+switch(e->type)
+{
+//move the new node
+case GDK_MOTION_NOTIFY:
+{
+GdkEvent * generated=new GdkEvent();
+generated->motion.x=e->motion.x;
+generated->motion.y=e->motion.y;
+generated->type=GDK_MOTION_NOTIFY;
+moveEventHandler(generated);
+break;
+}
+case GDK_BUTTON_RELEASE:
+ms.setModified();
+is_drawn=true;
+isbutton=1;
+window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
+active_node = ms.addNode(XY(clicked_x, clicked_y));
+nodesmap[active_node]=new Gnome::Canvas::Ellipse(displayed_graph,
+clicked_x-20, clicked_y-20, clicked_x+20, clicked_y+20);
+active_item=(Gnome::Canvas::Item *)(nodesmap[active_node]);
+*(nodesmap[active_node]) <<
+Gnome::Canvas::Properties::fill_color("blue");
+*(nodesmap[active_node]) <<
+Gnome::Canvas::Properties::outline_color("black");
+active_item->raise_to_top();
+(nodesmap[active_node])->show();
+nodetextmap[active_node]=new Gnome::Canvas::Text(displayed_graph,
+clicked_x+node_property_defaults[N_RADIUS]+5,
+clicked_y+node_property_defaults[N_RADIUS]+5, "");
+nodetextmap[active_node]->property_fill_color().set_value("darkblue");
+nodetextmap[active_node]->raise_to_top();
+//       mapwin.updateNode(active_node);
+propertyUpdate(active_node);
+isbutton=0;
+target_item=NULL;
+active_item=NULL;
+active_node=INVALID;
+break;
+default:
+break;
+}
+return false;
+}
+bool DigraphDisplayerCanvas::createArcEventHandler(GdkEvent* e)
+{
+MapStorage& ms = *mytab.mapstorage;
+switch(e->type)
+{
+case GDK_BUTTON_PRESS:
+//in arc creation right button has special meaning
+if(e->button.button!=3)
+{
+//there is not yet selected node
+if(active_node==INVALID)
+{
+//we mark the location of the event to be able to calculate parameters of dragging
+window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
+active_item=(get_item_at(clicked_x, clicked_y));
+active_node=INVALID;
+for (NodeIt i(ms.digraph); i!=INVALID; ++i)
+{
+if(nodesmap[i]==active_item)
+{
+active_node=i;
+}
+}
+//the clicked item is really a node
+if(active_node!=INVALID)
+{
+*(nodesmap[active_node]) << Gnome::Canvas::Properties::fill_color("red");
+isbutton=1;
+}
+//clicked item was not a node. It could be e.g. arc.
+else
+{
+active_item=NULL;
+}
+}
+//we only have to do sg. if the mouse button
+// is pressed already once AND the click was
+// on a node that was found in the set of
+//nodes, and now we only search for the second
+//node
+else
+{
+window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
+target_item=(get_item_at(clicked_x, clicked_y));
+Node target_node=INVALID;
+for (NodeIt i(ms.digraph); i!=INVALID; ++i)
+{
+if(nodesmap[i]==target_item)
+{
+target_node=i;
+}
+}
+//the clicked item is a node, the arc can be drawn
+if(target_node!=INVALID)
+{
+ms.setModified();
+*(nodesmap[target_node]) <<
+Gnome::Canvas::Properties::fill_color("red");
+active_arc = ms.addArc(active_node, target_node);
+if(target_node!=active_node)
+{
+arcsmap[active_arc]=new BrokenArc(displayed_graph, active_arc, *this);
+}
+else
+{
+arcsmap[active_arc]=new LoopArc(displayed_graph, active_arc, *this);
+}
+//initializing arc-text as well, to empty string
+XY text_pos=ms.getArrowCoords(active_arc);
+text_pos+=(XY(10,10));
+arctextmap[active_arc]=new Gnome::Canvas::Text(displayed_graph,
+text_pos.x, text_pos.y, "");
+arctextmap[active_arc]->property_fill_color().set_value(
+"darkgreen");
+arctextmap[active_arc]->raise_to_top();
+propertyUpdate(active_arc);
+}
+//clicked item was not a node. it could be an e.g. arc. we do not
+//deal with it furthermore.
+else
+{
+target_item=NULL;
+}
+}
+}
+break;
+case GDK_BUTTON_RELEASE:
+isbutton=0;
+//we clear settings in two cases
+//1: the arc is ready (target_item has valid value)
+//2: the arc creation is cancelled with right button
+if((target_item)||(e->button.button==3))
+{
+if(active_item)
+{
+propertyUpdate(active_node,N_COLOR);
+active_item=NULL;
+}
+if(target_item)
+{
+propertyUpdate(ms.digraph.target(active_arc),N_COLOR);
+target_item=NULL;
+}
+active_node=INVALID;
+active_arc=INVALID;
+}
+break;
+default:
+break;
+}
+return false;
+}
+bool DigraphDisplayerCanvas::eraserEventHandler(GdkEvent* e)
+{
+MapStorage& ms = *mytab.mapstorage;
+switch(e->type)
+{
+case GDK_BUTTON_PRESS:
+//finding the clicked items
+window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
+active_item=(get_item_at(clicked_x, clicked_y));
+active_node=INVALID;
+active_arc=INVALID;
+//was it a node?
+for (NodeIt i(ms.digraph); i!=INVALID; ++i)
+{
+if(nodesmap[i]==active_item)
+{
+active_node=i;
+}
+}
+//or was it an arc?
+if(active_node==INVALID)
+{
+for (ArcIt i(ms.digraph); i!=INVALID; ++i)
+{
+if(arcsmap[i]->getLine()==active_item)
+{
+active_arc=i;
+}
+}
+}
+// return if the clicked object is neither an arc nor a node
+if (active_arc == INVALID) return false;
+//recolor activated item
+if(active_item)
+{
+*active_item << Gnome::Canvas::Properties::fill_color("red");
+}
+break;
+case GDK_BUTTON_RELEASE:
+window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
+if(active_item)
+{
+//the cursor was not moved since pressing it
+if( active_item == ( get_item_at (clicked_x, clicked_y) ) )
+{
+//a node was found
+if(active_node!=INVALID)
+{
+ms.setModified();
+std::set<Digraph::Arc> arcs_to_delete;
+for(OutArcIt e(ms.digraph,active_node);e!=INVALID;++e)
+{
+arcs_to_delete.insert(e);
+}
+for(InArcIt e(ms.digraph,active_node);e!=INVALID;++e)
+{
+arcs_to_delete.insert(e);
+}
+//deleting collected arcs
+for(std::set<Digraph::Arc>::iterator
+arc_set_it=arcs_to_delete.begin();
+arc_set_it!=arcs_to_delete.end();
+++arc_set_it)
+{
+deleteItem(*arc_set_it);
+}
+deleteItem(active_node);
+}
+//a simple arc was chosen
+else if (active_arc != INVALID)
+{
+deleteItem(active_arc);
+}
+}
+//pointer was moved, deletion is cancelled
+else
+{
+if(active_node!=INVALID)
+{
+*active_item << Gnome::Canvas::Properties::fill_color("blue");
+}
+else if (active_arc != INVALID)
+{
+*active_item << Gnome::Canvas::Properties::fill_color("green");
+}
+}
+}
+//reseting datas
+active_item=NULL;
+active_arc=INVALID;
+active_node=INVALID;
+break;
+case GDK_MOTION_NOTIFY:
+break;
+default:
+break;
+}
+return false;
+}
+bool DigraphDisplayerCanvas::mapEditEventHandler(GdkEvent* e)
+{
+MapStorage& ms = *mytab.mapstorage;
+if(actual_tool==MAP_EDIT)
+{
+switch(e->type)
+{
+case GDK_BUTTON_PRESS:
+{
+//for determine, whether it was an arc
+Arc clicked_arc=INVALID;
+//for determine, whether it was a node
+Node clicked_node=INVALID;
+window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
+active_item=(get_item_at(clicked_x, clicked_y));
+//find the activated item between text of nodes
+for (NodeIt i(ms.digraph); i!=INVALID; ++i)
+{
+//at the same time only one can be active
+if(nodetextmap[i]==active_item)
+{
+clicked_node=i;
+}
+}
+//if there was not, search for it between nodes
+if(clicked_node==INVALID)
+{
+for (NodeIt i(ms.digraph); i!=INVALID; ++i)
+{
+//at the same time only one can be active
+if(nodesmap[i]==active_item)
+{
+clicked_node=i;
+}
+}
+}
+if(clicked_node==INVALID)
+{
+//find the activated item between texts
+for (ArcIt i(ms.digraph); i!=INVALID; ++i)
+{
+//at the same time only one can be active
+if(arctextmap[i]==active_item)
+{
+clicked_arc=i;
+}
+}
+//if it was not between texts, search for it between arcs
+if(clicked_arc==INVALID)
+{
+for (ArcIt i(ms.digraph); i!=INVALID; ++i)
+{
+//at the same time only one can be active
+if((arcsmap[i]->getLine())==active_item)
+{
+clicked_arc=i;
+}
+}
+}
+}
+//if it was really a node...
+if(clicked_node!=INVALID)
+{
+// the id map is not editable
+if (nodemap_to_edit == "label") return 0;
+//and there is activated map
+if(nodetextmap[clicked_node]->property_text().get_value()!="")
+{
+//activate the general variable for it
+active_node=clicked_node;
+//create a dialog
+Gtk::Dialog dialog("Edit value", true);
+dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
+dialog.add_button(Gtk::Stock::OK, Gtk::RESPONSE_ACCEPT);
+Gtk::VBox* vbox = dialog.get_vbox();
+/*
+Gtk::SpinButton spin(0.0, 4);
+spin.set_increments(1.0, 10.0);
+spin.set_range(-1000000.0, 1000000.0);
+spin.set_numeric(true);
+spin.set_value(atof(nodetextmap[active_node]->property_text().get_value().c_str()));
+vbox->add(spin);
+spin.show();
+*/
+Gtk::Entry entry;
+entry.set_text(nodetextmap[active_node]->property_text().get_value());
+vbox->add(entry);
+entry.show();
+switch (dialog.run())
+{
+case Gtk::RESPONSE_NONE:
+case Gtk::RESPONSE_CANCEL:
+break;
+case Gtk::RESPONSE_ACCEPT:
+switch (ms.getNodeMapElementType(nodemap_to_edit))
+{
+case MapValue::NUMERIC:
+ms.set(nodemap_to_edit, active_node,
+atof(entry.get_text().c_str()));
+break;
+case MapValue::STRING:
+ms.set(nodemap_to_edit, active_node,
+static_cast<std::string>(entry.get_text()));
+break;
+}
+nodetextmap[active_node]->property_text().set_value(
+static_cast<std::string>(ms.get(nodemap_to_edit, active_node)));
+//mapwin.updateNode(active_node);
+//mapwin.updateNode(Node(INVALID));
+propertyUpdate(Node(INVALID));
+}
+}
+}
+else
+//if it was really an arc...
+if(clicked_arc!=INVALID)
+{
+// the id map is not editable
+if (arcmap_to_edit == "label") return 0;
+//and there is activated map
+if(arctextmap[clicked_arc]->property_text().get_value()!="")
+{
+//activate the general variable for it
+active_arc=clicked_arc;
+//create a dialog
+Gtk::Dialog dialog("Edit value", true);
+dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
+dialog.add_button(Gtk::Stock::OK, Gtk::RESPONSE_ACCEPT);
+Gtk::VBox* vbox = dialog.get_vbox();
+/*
+Gtk::SpinButton spin(0.0, 4);
+spin.set_increments(1.0, 10.0);
+spin.set_range(-1000000.0, 1000000.0);
+spin.set_numeric(true);
+spin.set_value(atof(arctextmap[active_arc]->property_text().get_value().c_str()));
+vbox->add(spin);
+spin.show();
+*/
+Gtk::Entry entry;
+entry.set_text(arctextmap[active_arc]->property_text().get_value());
+vbox->add(entry);
+entry.show();
+std::cout << arcmap_to_edit << std::endl;
+switch (dialog.run())
+{
+case Gtk::RESPONSE_NONE:
+case Gtk::RESPONSE_CANCEL:
+break;
+case Gtk::RESPONSE_ACCEPT:
+switch (ms.getArcMapElementType(arcmap_to_edit))
+{
+case MapValue::NUMERIC:
+ms.set(arcmap_to_edit, active_arc,
+atof(entry.get_text().c_str()));
+break;
+case MapValue::STRING:
+ms.set(arcmap_to_edit, active_arc,
+static_cast<std::string>(entry.get_text()));
+break;
+}
+arctextmap[active_arc]->property_text().set_value(
+static_cast<std::string>(ms.get(arcmap_to_edit, active_arc)));
+//mapwin.updateArc(active_arc);
+//                   mapwin.updateArc(Arc(INVALID));
+propertyUpdate(Arc(INVALID));
+}
+}
+}
+break;
+}
+default:
+break;
+}
+}
+return false;
+}
+void DigraphDisplayerCanvas::deleteItem(Node node_to_delete)
+{
+delete(nodetextmap[node_to_delete]);
+delete(nodesmap[node_to_delete]);
+mytab.mapstorage->digraph.erase(node_to_delete);
+}
+void DigraphDisplayerCanvas::deleteItem(Arc arc_to_delete)
+{
+delete(arctextmap[arc_to_delete]);
+delete(arcsmap[arc_to_delete]);
+mytab.mapstorage->digraph.erase(arc_to_delete);
+}
+void DigraphDisplayerCanvas::textReposition(XY new_place)
+{
+new_place+=(XY(10,10));
+arctextmap[forming_arc]->property_x().set_value(new_place.x);
+arctextmap[forming_arc]->property_y().set_value(new_place.y);
+}
+void DigraphDisplayerCanvas::toggleArcActivity(ArcBase* active_bre, bool on)
+{
+if(on)
+{
+if(forming_arc!=INVALID)
+{
+std::cerr << "ERROR!!!! Valid arc found!" << std::endl;
+}
+else
+{
+for (ArcIt i(mytab.mapstorage->digraph); i!=INVALID; ++i)
+{
+if(arcsmap[i]==active_bre)
+{
+forming_arc=i;
+}
+}
+}
+}
+else
+{
+if(forming_arc!=INVALID)
+{
+forming_arc=INVALID;
+}
+else
+{
+std::cerr << "ERROR!!!! Invalid arc found!" << std::endl;
+}
+}
+}
+void DigraphDisplayerCanvas::moveNode(double dx, double dy, Gnome::Canvas::Item * item, Node node)
+{
+MapStorage& ms = *mytab.mapstorage;
+Gnome::Canvas::Item * moved_item=item;
+Node moved_node=node;
+if(item==NULL && node==INVALID)
+{
+moved_item=active_item;
+moved_node=active_node;
+}
+else
+{
+isbutton=1;
+}
+//repositioning node and its text
+moved_item->move(dx, dy);
+nodetextmap[moved_node]->move(dx, dy);
+// the new coordinates of the centre of the node
+double coord_x = dx + ms.getNodeCoords(moved_node).x;
+double coord_y = dy + ms.getNodeCoords(moved_node).y;
+// write back the new coordinates to the coords map
+ms.setNodeCoords(moved_node, XY(coord_x, coord_y));
+//all the arcs connected to the moved point has to be redrawn
+for(OutArcIt ei(ms.digraph,moved_node);ei!=INVALID;++ei)
+{
+XY arrow_pos;
+if (ms.digraph.source(ei) == ms.digraph.target(ei))
+{
+arrow_pos = ms.getArrowCoords(ei) + XY(dx, dy);
+}
+else
+{
+XY moved_node_1(coord_x - dx, coord_y - dy);
+XY moved_node_2(coord_x, coord_y);
+Node target = ms.digraph.target(ei);
+XY fix_node = ms.getNodeCoords(target);
+XY old_arrow_pos(ms.getArrowCoords(ei));
+arrow_pos = calcArrowPos(moved_node_1, moved_node_2, fix_node, old_arrow_pos, isbutton);
+}
+ms.setArrowCoords(ei, arrow_pos);
+arcsmap[ei]->draw();
+//reposition of arctext
+XY text_pos=ms.getArrowCoords(ei);
+text_pos+=(XY(10,10));
+arctextmap[ei]->property_x().set_value(text_pos.x);
+arctextmap[ei]->property_y().set_value(text_pos.y);
+}
+for(InArcIt ei(ms.digraph,moved_node);ei!=INVALID;++ei)
+{
+if (ms.digraph.source(ei) != ms.digraph.target(ei))
+{
+XY moved_node_1(coord_x - dx, coord_y - dy);
+XY moved_node_2(coord_x, coord_y);
+Node source = ms.digraph.source(ei);
+XY fix_node = ms.getNodeCoords(source);
+XY old_arrow_pos(ms.getArrowCoords(ei));
+XY arrow_pos;
+arrow_pos = calcArrowPos(moved_node_1, moved_node_2, fix_node, old_arrow_pos, isbutton);
+ms.setArrowCoords(ei, arrow_pos);
+arcsmap[ei]->draw();
+//reposition of arctext
+XY text_pos=ms.getArrowCoords(ei);
+text_pos+=(XY(10,10));
+arctextmap[ei]->property_x().set_value(text_pos.x);
+arctextmap[ei]->property_y().set_value(text_pos.y);
+}
+}
+}
+Gdk::Color DigraphDisplayerCanvas::rainbowColorCounter(double min, double max, double w)
+{
+Gdk::Color color;
+double pos=(w-min)/(max-min);
+int phase=0;
+//rainbow transitions contain 6 phase
+//in each phase only one color is changed
+//first we determine the phase, in which
+//the actual value belongs to
+for (int i=0;i<=5;i++)
+{
+if(((double)i/6<pos)&&(pos<=(double(i+1)/6)))
+{
+phase=i;
+}
+}
+if(phase<6)
+{
+//within its 1/6 long phase the relativ position
+//determines the power of the color changed in
+//that phase
+//we normalize that to one, to be able to give percentage
+//value for the function
+double rel_pos=(pos-(phase/6.0))*6.0;
+switch(phase)
+{
+case 0:
+color.set_rgb_p (1, 0, 1-rel_pos);
+break;
+case 1:
+color.set_rgb_p (1, rel_pos, 0);
+break;
+case 2:
+color.set_rgb_p (1-rel_pos, 1, 0);
+break;
+case 3:
+color.set_rgb_p (0, 1, rel_pos);
+break;
+case 4:
+color.set_rgb_p (0, 1-rel_pos, 1);
+break;
+case 5:
+color.set_rgb_p ((rel_pos/3.0), 0, 1);
+break;
+default:
+std::cout << "Wrong phase: " << phase << " " << pos << std::endl;
+}
+}
+else
+{
+std::cout << "Wrong phase: " << phase << " " << pos << std::endl;
+}
+return color;
+}