-// $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>
+// SuperTux
// Copyright (C) 2006 Matthias Braun <matze@braunis.de>
//
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License
-// as published by the Free Software Foundation; either version 2
-// of the License, or (at your option) any later version.
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// 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.
-#include <config.h>
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
-#include <math.h>
-#include "path_walker.hpp"
+#include "object/path_walker.hpp"
-PathWalker::PathWalker(const Path* path)
- : path(path), current_node_nr(0), next_node_nr(0), node_time(0),
- walking_speed(1.0)
+#include <math.h>
+#include <assert.h>
+
+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),
+ node_mult(),
+ 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()
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();
}
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;
}
}
-
+
+ node_time += elapsed_time * node_mult;
+
+ return get_pos();
+}
+
+Vector
+PathWalker::get_pos()
+{
+ const Path::Node* current_node = & (path->nodes[current_node_nr]);
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;
+ 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++;
switch(path->mode) {
case Path::PING_PONG:
walking_speed = -walking_speed;
+ next_node_nr = path->nodes.size() > 1 ? 1 : 0;
return;
default:
break;
next_node_nr = 0;
walking_speed = 0;
}
+
+/* EOF */