src/object/platform.cpp

   1 //  SuperTux
   2 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   3 //
   4 //  This program is free software: you can redistribute it and/or modify
   5 //  it under the terms of the GNU General Public License as published by
   6 //  the Free Software Foundation, either version 3 of the License, or
   7 //  (at your option) any later version.
   8 //
   9 //  This program is distributed in the hope that it will be useful,
  10 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 //  GNU General Public License for more details.
  13 //
  14 //  You should have received a copy of the GNU General Public License
  15 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include "object/platform.hpp"
  18
  19 #include "object/player.hpp"
  20 #include "scripting/platform.hpp"
  21 #include "scripting/squirrel_util.hpp"
  22 #include "supertux/object_factory.hpp"
  23 #include "supertux/sector.hpp"
  24 #include "util/reader.hpp"
  25
  26 Platform::Platform(const Reader& reader)
  27   : MovingSprite(reader, Vector(0,0), LAYER_OBJECTS, COLGROUP_STATIC),
  28     speed(Vector(0,0)),
  29     automatic(false), player_contact(false), last_player_contact(false)
  30 {
  31   bool running = true;
  32   reader.get("name", name);
  33   reader.get("running", running);
  34   if ((name == "") && (!running)) automatic=true;
  35   const lisp::Lisp* pathLisp = reader.get_lisp("path");
  36   if(pathLisp == NULL)
  37     throw std::runtime_error("No path specified for platform");
  38   path.reset(new Path());
  39   path->read(*pathLisp);
  40   walker.reset(new PathWalker(path.get(), running));
  41   bbox.set_pos(path->get_base());
  42 }
  43
  44 /*
  45   Platform::Platform(const Platform& other) :
  46   MovingSprite(other),
  47   ScriptInterface(other),
  48   speed(other.speed),
  49   automatic(other.automatic),
  50   player_contact(false),
  51   last_player_contact(false)
  52   {
  53   name = other.name;
  54   path.reset(new Path(*other.path));
  55   walker.reset(new PathWalker(*other.walker));
  56   walker->path = &*path;
  57   }
  58 */
  59
  60 HitResponse
  61 Platform::collision(GameObject& other, const CollisionHit& )
  62 {
  63   if (dynamic_cast<Player*>(&other)) player_contact = true;
  64   return FORCE_MOVE;
  65 }
  66
  67 void
  68 Platform::update(float elapsed_time)
  69 {
  70   // check if Platform should automatically pick a destination
  71   if (automatic) {
  72
  73     if (!player_contact && !walker->is_moving()) {
  74       // Player doesn't touch platform and Platform is not moving
  75
  76       // Travel to node nearest to nearest player
  77       // FIXME: does not really use nearest player
  78       Player* player = 0;
  79       std::vector<Player*> players = Sector::current()->get_players();
  80       for (std::vector<Player*>::iterator playerIter = players.begin(); playerIter != players.end(); ++playerIter) {
  81         player = *playerIter;
  82       }
  83       if (player) {
  84         int nearest_node_id = path->get_nearest_node_no(player->get_bbox().p2);
  85         if (nearest_node_id != -1) {
  86           goto_node(nearest_node_id);
  87         }
  88       }
  89     }
  90
  91     if (player_contact && !last_player_contact && !walker->is_moving()) {
  92       // Player touched platform, didn't touch last frame and Platform is not moving
  93
  94       // Travel to node farthest from current position
  95       int farthest_node_id = path->get_farthest_node_no(get_pos());
  96       if (farthest_node_id != -1) {
  97         goto_node(farthest_node_id);
  98       }
  99     }
 100
 101     // Clear player_contact flag set by collision() method
 102     last_player_contact = player_contact;
 103     player_contact = false;
 104   }
 105
 106   movement = walker->advance(elapsed_time) - get_pos();
 107   speed = movement / elapsed_time;
 108 }
 109
 110 void
 111 Platform::goto_node(int node_no)
 112 {
 113   walker->goto_node(node_no);
 114 }
 115
 116 void
 117 Platform::start_moving()
 118 {
 119   walker->start_moving();
 120 }
 121
 122 void
 123 Platform::stop_moving()
 124 {
 125   walker->stop_moving();
 126 }
 127
 128 void
 129 Platform::expose(HSQUIRRELVM vm, SQInteger table_idx)
 130 {
 131   if (name.empty()) return;
 132   Scripting::Platform* interface = new Scripting::Platform(this);
 133   expose_object(vm, table_idx, interface, name, true);
 134 }
 135
 136 void
 137 Platform::unexpose(HSQUIRRELVM vm, SQInteger table_idx)
 138 {
 139   if (name.empty()) return;
 140   Scripting::unexpose_object(vm, table_idx, name);
 141 }
 142
 143 IMPLEMENT_FACTORY(Platform, "platform");
 144
 145 /* EOF */