fix cr/lfs and remove trailing whitespaces...

[supertux.git] / src / object / path_walker.cpp

diff --git a/src/object/path_walker.cpp b/src/object/path_walker.cpp
index 1eca370..0c8ae25 100644 (file)
--- a/src/object/path_walker.cpp
+++ b/src/object/path_walker.cpp
@@ -1,8 +1,6 @@
-//  $Id: path.hpp 3114 2006-03-23 23:47:04Z sommer $
-// 
-//  SuperTux Path
-//  Copyright (C) 2005 Philipp <balinor@pnxs.de>
-//  Copyright (C) 2006 Christoph Sommer <christoph.sommer@2006.expires.deltadevelopment.de>
+//  $Id$
+//
+//  SuperTux
 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
 //
 //  This program is free software; you can redistribute it and/or
@@ -14,22 +12,23 @@
 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 //  GNU General Public License for more details.
-// 
+//
 //  You should have received a copy of the GNU General Public License
 //  along with this program; if not, write to the Free Software
-//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-//  02111-1307, USA.
+//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
 #include <config.h>
 
 #include <math.h>
+#include <assert.h>
 #include "path_walker.hpp"
 
-PathWalker::PathWalker(const Path* path)
-  : path(path), current_node_nr(0), next_node_nr(0), node_time(0),
+PathWalker::PathWalker(const Path* path, bool running)
+  : path(path), running(running), current_node_nr(0), next_node_nr(0), stop_at_node_nr(running?-1:0), node_time(0),
     walking_speed(1.0)
 {
-  last_pos = path->nodes[0].position;
-  node_time = path->nodes[0].time;
+  node_mult = 1 / path->nodes[0].time;
+  next_node_nr = path->nodes.size() > 1 ? 1 : 0;
 }
 
 PathWalker::~PathWalker()
@@ -39,13 +38,15 @@ PathWalker::~PathWalker()
 Vector
 PathWalker::advance(float elapsed_time)
 {
+  if (!running) return path->nodes[current_node_nr].position;
+
   assert(elapsed_time >= 0);
 
   elapsed_time *= fabsf(walking_speed);
-  
+
   const Path::Node* current_node = & (path->nodes[current_node_nr]);
-  while(node_time - elapsed_time < 0) {
-    elapsed_time -= current_node->time - node_time;
+  while(node_time + elapsed_time * node_mult >= 1) {
+    elapsed_time -= (1 - node_time) / node_mult;
 
     if(walking_speed > 0) {
       advance_node();
@@ -54,30 +55,50 @@ PathWalker::advance(float elapsed_time)
     }
 
     current_node = & (path->nodes[current_node_nr]);
+    node_time = 0;
     if(walking_speed > 0) {
-      node_time = current_node->time;
+      node_mult = 1 / current_node->time;
     } else {
-      node_time = path->nodes[next_node_nr].time;
+      node_mult = 1 / path->nodes[next_node_nr].time;
     }
   }
-  
+
   const Path::Node* next_node = & (path->nodes[next_node_nr]);
-  node_time -= elapsed_time;
- 
-  Vector new_pos = current_node->position + 
-    (next_node->position - current_node->position)
-    * (1 - (node_time / current_node->time));
-    
-  Vector result = new_pos - last_pos;
-  last_pos = new_pos;
-  
-  return result;
+  node_time += elapsed_time * node_mult;
+
+  Vector new_pos = current_node->position +
+    (next_node->position - current_node->position) * node_time;
+
+  return new_pos;
 }
 
 void
+PathWalker::goto_node(int node_no)
+{
+  if (node_no == stop_at_node_nr) return;
+  running = true;
+  stop_at_node_nr = node_no;
+}
+
+void
+PathWalker::start_moving()
+{
+  running = true;
+  stop_at_node_nr = -1;
+}
+
+void
+PathWalker::stop_moving()
+{
+  stop_at_node_nr = next_node_nr;
+}
+
+
+void
 PathWalker::advance_node()
 {
   current_node_nr = next_node_nr;
+  if (static_cast<int>(current_node_nr) == stop_at_node_nr) running = false;
 
   if(next_node_nr + 1 < path->nodes.size()) {
     next_node_nr++;
@@ -119,6 +140,7 @@ PathWalker::goback_node()
   switch(path->mode) {
     case Path::PING_PONG:
       walking_speed = -walking_speed;
+      next_node_nr = path->nodes.size() > 1 ? 1 : 0;
       return;
     default:
       break;