From 425acf9068dac38bccb97b12f1b423db5787e294 Mon Sep 17 00:00:00 2001
From: Francois Fleuret <francois@fleuret.org>
Date: Tue, 21 Aug 2012 13:45:32 -0700
Subject: [PATCH] Renamed from KSP to MTP (Multi-tracked paths)

---
 Makefile         |  8 ++++++--
 ksp.cc => mtp.cc | 30 ++++++++++++++----------------
 2 files changed, 20 insertions(+), 18 deletions(-)
 rename ksp.cc => mtp.cc (90%)

diff --git a/Makefile b/Makefile
index be7e0a9..d7c5225 100644
--- a/Makefile
+++ b/Makefile
@@ -35,11 +35,15 @@ endif
 
 CXXFLAGS = -Wall -I/usr/include/cairo $(OPTIMIZE_FLAG) $(PROFILE_FLAG) $(CXXGLPK)
 
-all: miniksp
+all: mtp miniksp
 
 TAGS: *.cc *.h
 	etags --members -l c++ *.cc *.h
 
+mtp: \
+	mtp.o
+	$(CXX) $(CXXFLAGS) -o $@ $^ $(LDFLAGS)
+
 miniksp: \
 	miniksp.o
 	$(CXX) $(CXXFLAGS) -o $@ $^ $(LDFLAGS)
@@ -48,6 +52,6 @@ Makefile.depend: *.h *.cc Makefile
 	$(CC) $(CXXFLAGS) -M *.cc > Makefile.depend
 
 clean:
-	\rm -f miniksp *.o Makefile.depend TAGS
+	\rm -f mtp miniksp *.o Makefile.depend TAGS
 
 -include Makefile.depend
diff --git a/ksp.cc b/mtp.cc
similarity index 90%
rename from ksp.cc
rename to mtp.cc
index 1e55a33..529ba80 100644
--- a/ksp.cc
+++ b/mtp.cc
@@ -1,7 +1,5 @@
 
 ///////////////////////////////////////////////////////////////////////////
-// START_IP_HEADER                                                       //
-//                                                                       //
 // This program is free software: you can redistribute it and/or modify  //
 // it under the terms of the version 3 of the GNU General Public License //
 // as published by the Free Software Foundation.                         //
@@ -16,10 +14,10 @@
 //                                                                       //
 // Written by and Copyright (C) Francois Fleuret                         //
 // Contact <francois.fleuret@idiap.ch> for comments & bug reports        //
-//                                                                       //
-// END_IP_HEADER                                                         //
 ///////////////////////////////////////////////////////////////////////////
 
+// Multi-Tracked Path
+
 // #define VERBOSE
 
 #include <iostream>
@@ -47,7 +45,7 @@ class Vertex;
 class Edge {
 public:
   int occupied;
-  scalar_t length, fixed_length;
+  scalar_t length, work_length;
   Vertex *terminal_vertex;
   Edge *next, *pred;
 };
@@ -89,8 +87,8 @@ public:
         int source, int sink);
   ~Graph();
 
-  void initialize_fixed_lengths();
-  void update_fixed_length();
+  void initialize_work_lengths();
+  void update_work_length();
   void find_shortest_path();
   void find_best_paths();
   void print();
@@ -145,7 +143,7 @@ Graph::~Graph() {
   delete[] edge_heap;
 }
 
-void Graph::initialize_fixed_lengths() {
+void Graph::initialize_work_lengths() {
   scalar_t length_min = 0;
   for(int n = 0; n < nb_vertices; n++) {
     for(Edge *e = vertices[n].first_edge; e; e = e->next) {
@@ -154,16 +152,16 @@ void Graph::initialize_fixed_lengths() {
   }
   for(int n = 0; n < nb_vertices; n++) {
     for(Edge *e = vertices[n].first_edge; e; e = e->next) {
-      e->fixed_length = e->length - length_min;
+      e->work_length = e->length - length_min;
     }
   }
 }
 
-void Graph::update_fixed_length() {
+void Graph::update_work_length() {
   for(int n = 0; n < nb_vertices; n++) {
     scalar_t d = vertices[n].distance;
     for(Edge *e = vertices[n].first_edge; e; e = e->next) {
-      e->fixed_length += d - e->terminal_vertex->distance;
+      e->work_length += d - e->terminal_vertex->distance;
     }
   }
 }
@@ -179,7 +177,7 @@ void Graph::find_shortest_path() {
 #ifdef DEBUG
   for(int n = 0; n < nb_vertices; n++) {
     for(Edge *e = vertices[n].first_edge; e; e = e->next) {
-      if(e->fixed_length < 0) {
+      if(e->work_length < 0) {
         cerr << "DEBUG error in find_shortest_path: Edge fixed lengths have to be positive."
              << endl;
         abort();
@@ -203,7 +201,7 @@ void Graph::find_shortest_path() {
     for(int f = 0; f < front_size; f++) {
       v = front[f];
       for(Edge *e = v->first_edge; e; e = e->next) {
-        d = v->distance + e->fixed_length;
+        d = v->distance + e->work_length;
         tv = e->terminal_vertex;
         if(d < tv->distance) {
           tv->distance = d;
@@ -230,7 +228,7 @@ void Graph::find_shortest_path() {
 void Graph::find_best_paths() {
   scalar_t total_length;
 
-  initialize_fixed_lengths();
+  initialize_work_lengths();
 
   do {
 #ifdef VERBOSE
@@ -239,7 +237,7 @@ void Graph::find_best_paths() {
 
     total_length = 0.0;
     find_shortest_path();
-    update_fixed_length();
+    update_work_length();
 
     // Do we reach the sink?
     if(sink->pred_edge) {
@@ -265,7 +263,7 @@ void Graph::find_best_paths() {
           e->terminal_vertex = v->pred_vertex;
           e->occupied = 1 - e->occupied;
           e->length = - e->length;
-          e->fixed_length = - e->fixed_length;
+          e->work_length = - e->work_length;
           v->pred_vertex->del_edge(e);
           v->add_edge(e);
         }
-- 
2.20.1