fix cr/lfs and remove trailing whitespaces...

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

diff --git a/src/object/path.cpp b/src/object/path.cpp
index 4296315..6529cf3 100644 (file)
--- a/src/object/path.cpp
+++ b/src/object/path.cpp
@@ -1,7 +1,9 @@
 //  $Id$
-// 
-//  SuperTux
+//
+//  SuperTux Path
 //  Copyright (C) 2005 Philipp <balinor@pnxs.de>
+//  Copyright (C) 2006 Christoph Sommer <christoph.sommer@2006.expires.deltadevelopment.de>
+//  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
@@ -12,140 +14,122 @@
 //  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>
 
 #include "path.hpp"
 
 #include "lisp/lisp.hpp"
 #include "lisp/list_iterator.hpp"
 #include "object_factory.hpp"
+#include "log.hpp"
 
 #include <assert.h>
+#include <iostream>
+#include <stdexcept>
+#include <sstream>
 
-
-// some constants
-#define DEFAULT_PIXELS_PER_SECOND      50
-#define EPSILON                                1.5
-
-Path::Path(const lisp::Lisp& reader)
+Path::Path()
 {
-  forward = true;
-  float x,y;
-
-  lisp::ListIterator iter(&reader);
-
-  assert (iter.next());
-  std::string token = iter.item();
-  assert(token == "name");
-  iter.value()->get(name);
-
-  circular = true;
-  assert (iter.next());
-  token = iter.item();
-  assert(token == "circular");
-  iter.value()->get(circular);
-
-  pixels_per_second = DEFAULT_PIXELS_PER_SECOND;
-  assert (iter.next());
-  token = iter.item();
-  if (token == "speed") {
-    iter.value()->get(pixels_per_second);
-    iter.next();
-  }
-  do {
-    token = iter.item();
-    if(token == "x") {
-      iter.value()->get(x);
-    } else if(token == "y") {
-      iter.value()->get(y);
-      points.push_back(Vector(x,y));
-    }
-  } while(iter.next());
-
-  next_target = points.begin();
-  pos = *next_target;
-
-  calc_next_velocity();
-
-  // register this path for lookup:
-  registry[name] = this;
 }
 
 Path::~Path()
 {
-  registry.erase(name);
 }
 
 void
-Path::update(float elapsed_time)
+Path::read(const lisp::Lisp& reader)
 {
-  last_movement = velocity * elapsed_time;
-  pos += last_movement;
-  if ((pos - *next_target).norm() < EPSILON) {
-    pos = *next_target;
-    calc_next_velocity();
-  }
-}
+  lisp::ListIterator iter(&reader);
 
-void
-Path::draw(DrawingContext& context)
-{
-   // TODO: Add a visible flag, draw the path if true
-}
+  mode = CIRCULAR;
+  while(iter.next()) {
+    if(iter.item() == "mode") {
+      std::string mode_string;
+      if(!iter.value()->get(mode_string))
+        throw std::runtime_error("Pathmode not a string");
+
+      if(mode_string == "oneshot")
+        mode = ONE_SHOT;
+      else if(mode_string == "pingpong")
+        mode = PING_PONG;
+      else if(mode_string == "circular")
+        mode = CIRCULAR;
+      else {
+        std::ostringstream msg;
+        msg << "Unknown pathmode '" << mode_string << "' found";
+        throw std::runtime_error(msg.str());
+      }
+      continue;
+    }
 
-const Vector&
-Path::GetPosition() {
-  return pos;
-}
+    if(iter.item() != "node") {
+      log_warning << "unknown token '" << iter.item() << "' in Path nodes list. Ignored." << std::endl;
+      continue;
+    }
+    const lisp::Lisp* node_lisp = iter.lisp();
 
-const Vector&
-Path::GetStart() {
-  return *(points.begin());
-}
+    // each new node will inherit all values from the last one
+    Node node;
+    node.time = 1;
+    if( (!node_lisp->get("x", node.position.x) ||
+          !node_lisp->get("y", node.position.y)))
+      throw std::runtime_error("Path node without x and y coordinate specified");
+    node_lisp->get("time", node.time);
+
+    if(node.time <= 0)
+      throw std::runtime_error("Path node with non-positive time");
 
-const Vector&
-Path::GetLastMovement() {
-  return last_movement;
+    nodes.push_back(node);
+  }
+
+  if (nodes.empty())
+    throw std::runtime_error("Path with zero nodes");
 }
 
 void
-Path::calc_next_velocity()
+Path::write(lisp::Writer& writer)
 {
-  Vector distance;
-
-  if (circular) {
-    ++next_target;
-    if (next_target == points.end()) {
-      next_target = points.begin();
-    }
-  }
-  else if (forward) {
-    ++next_target;
-    if (next_target == points.end()) {
-      forward = false;
-    }
-  }
-  else {
-    //FIXME: Implement going backwards on the list
-    //       I have no f***ing idea how this is done in C++
+  writer.start_list("path");
+
+  switch(mode) {
+    case ONE_SHOT:
+      writer.write_string("mode", "oneshot");
+      break;
+    case PING_PONG:
+      writer.write_string("mode", "pingpong");
+      break;
+    case CIRCULAR:
+      writer.write_string("mode", "circular");
+      break;
+    default:
+      log_warning << "Don't know how to write mode " << (int) mode << " ?!?" << std::endl;
+      break;
   }
 
-  distance = *next_target - pos;
-  velocity = distance.unit() * pixels_per_second;
-}
+  for (size_t i=0; i < nodes.size(); i++) {
+    const Node& node = nodes[i];
 
-//////////////////////////////////////////////////////////////////////////////
-// static stuff
+    writer.start_list("node");
+    writer.write_float("x", node.position.x);
+    writer.write_float("y", node.position.y);
+    writer.write_float("time", node.time);
 
-PathRegistry Path::registry;
+    writer.end_list("node");
+  }
 
-Path*
-Path::GetByName(const std::string& name) {
-  return registry[name];
+  writer.end_list("path");
 }
 
-IMPLEMENT_FACTORY(Path, "path");
+Vector
+Path::get_base() const
+{
+  if(nodes.empty())
+    return Vector(0, 0);
+
+  return nodes[0].position;
+}