src/object/platform.cpp

   1 //  $Id$
   2 //
   3 //  SuperTux
   4 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   5 //
   6 //  This program is free software; you can redistribute it and/or
   7 //  modify it under the terms of the GNU General Public License
   8 //  as published by the Free Software Foundation; either version 2
   9 //  of the License, or (at your option) any later version.
  10 //
  11 //  This program is distributed in the hope that it will be useful,
  12 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //  GNU General Public License for more details.
  15 //
  16 //  You should have received a copy of the GNU General Public License
  17 //  along with this program; if not, write to the Free Software
  18 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20 #include <config.h>
  21
  22 #include "platform.hpp"
  23
  24 #include <stdexcept>
  25 #include "log.hpp"
  26 #include "video/drawing_context.hpp"
  27 #include "resources.hpp"
  28 #include "player.hpp"
  29 #include "path.hpp"
  30 #include "path_walker.hpp"
  31 #include "sprite/sprite.hpp"
  32 #include "lisp/lisp.hpp"
  33 #include "object_factory.hpp"
  34 #include "scripting/platform.hpp"
  35 #include "scripting/squirrel_util.hpp"
  36 #include "sector.hpp"
  37
  38 Platform::Platform(const lisp::Lisp& reader)
  39         : MovingSprite(reader, Vector(0,0), LAYER_OBJECTS, COLGROUP_STATIC),
  40         speed(Vector(0,0)),
  41         automatic(false), player_contact(false), last_player_contact(false)
  42 {
  43   bool running = true;
  44   reader.get("name", name);
  45   reader.get("running", running);
  46   if ((name == "") && (!running)) automatic=true;
  47   const lisp::Lisp* pathLisp = reader.get_lisp("path");
  48   if(pathLisp == NULL)
  49     throw std::runtime_error("No path specified for platform");
  50   path.reset(new Path());
  51   path->read(*pathLisp);
  52   walker.reset(new PathWalker(path.get(), running));
  53   bbox.set_pos(path->get_base());
  54 }
  55
  56 Platform::Platform(const Platform& other)
  57         : MovingSprite(other), ScriptInterface(other),
  58         speed(other.speed),
  59         automatic(other.automatic), player_contact(false), last_player_contact(false)
  60 {
  61   name = other.name;
  62   path.reset(new Path(*other.path));
  63   walker.reset(new PathWalker(*other.walker));
  64   walker->path = &*path;
  65 }
  66
  67 HitResponse
  68 Platform::collision(GameObject& other, const CollisionHit& )
  69 {
  70   if (dynamic_cast<Player*>(&other)) player_contact = true;
  71   return FORCE_MOVE;
  72 }
  73
  74 void
  75 Platform::update(float elapsed_time)
  76 {
  77   // check if Platform should automatically pick a destination
  78   if (automatic) {
  79
  80     if (!player_contact && !walker->is_moving()) {
  81       // Player doesn't touch platform and Platform is not moving
  82
  83       // Travel to node nearest to nearest player
  84       // FIXME: does not really use nearest player
  85       Player* player = 0;
  86       std::vector<Player*> players = Sector::current()->get_players();
  87       for (std::vector<Player*>::iterator playerIter = players.begin(); playerIter != players.end(); ++playerIter) {
  88         player = *playerIter;
  89       }
  90       if (player) {
  91         int nearest_node_id = path->get_nearest_node_no(player->get_bbox().p2);
  92         if (nearest_node_id != -1) {
  93           goto_node(nearest_node_id);
  94         }
  95       }
  96     }
  97
  98     if (player_contact && !last_player_contact && !walker->is_moving()) {
  99       // Player touched platform, didn't touch last frame and Platform is not moving
 100
 101       // Travel to node farthest from current position
 102       int farthest_node_id = path->get_farthest_node_no(get_pos());
 103       if (farthest_node_id != -1) {
 104         goto_node(farthest_node_id);
 105       }
 106     }
 107
 108     // Clear player_contact flag set by collision() method
 109     last_player_contact = player_contact;
 110     player_contact = false;
 111   }
 112
 113   movement = walker->advance(elapsed_time) - get_pos();
 114   speed = movement / elapsed_time;
 115 }
 116
 117 void
 118 Platform::goto_node(int node_no)
 119 {
 120   walker->goto_node(node_no);
 121 }
 122
 123 void
 124 Platform::start_moving()
 125 {
 126   walker->start_moving();
 127 }
 128
 129 void
 130 Platform::stop_moving()
 131 {
 132   walker->stop_moving();
 133 }
 134
 135 void
 136 Platform::expose(HSQUIRRELVM vm, SQInteger table_idx)
 137 {
 138   if (name.empty()) return;
 139   Scripting::Platform* interface = new Scripting::Platform(this);
 140   expose_object(vm, table_idx, interface, name, true);
 141 }
 142
 143 void
 144 Platform::unexpose(HSQUIRRELVM vm, SQInteger table_idx)
 145 {
 146   if (name.empty()) return;
 147   Scripting::unexpose_object(vm, table_idx, name);
 148 }
 149
 150 IMPLEMENT_FACTORY(Platform, "platform");