3 // SuperTux - BicyclePlatform
4 // Copyright (C) 2007 Christoph Sommer <christoph.sommer@2007.expires.deltadevelopment.de>
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.
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.
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.
22 #include "bicycle_platform.hpp"
27 #include "video/drawing_context.hpp"
28 #include "resources.hpp"
31 #include "path_walker.hpp"
32 #include "sprite/sprite.hpp"
33 #include "lisp/lisp.hpp"
34 #include "object_factory.hpp"
36 #include "object/portable.hpp"
38 BicyclePlatform::BicyclePlatform(const lisp::Lisp& reader)
39 : MovingSprite(reader, LAYER_OBJECTS, COLGROUP_STATIC),
40 master(0), slave(0), radius(128), angle(0), angular_speed(0), momentum(0)
45 BicyclePlatform::BicyclePlatform(BicyclePlatform* master)
46 : MovingSprite(*master),
47 master(master), slave(this), center(master->center), radius(master->radius), angle(master->angle + M_PI), angular_speed(0), momentum(0)
49 set_pos(get_pos() + Vector(master->get_bbox().get_width(), 0));
50 master->master = master;
54 BicyclePlatform::~BicyclePlatform() {
55 if ((this == master) && (master)) {
59 if ((master) && (this == slave)) {
68 BicyclePlatform::collision(GameObject& other, const CollisionHit& )
71 // somehow the hit parameter does not get filled in, so to determine (hit.top == true) we do this:
72 MovingObject* mo = dynamic_cast<MovingObject*>(&other);
73 if (!mo) return FORCE_MOVE;
74 if ((mo->get_bbox().p2.y) > (get_bbox().p1.y + 2)) return FORCE_MOVE;
76 Player* pl = dynamic_cast<Player*>(mo);
78 if (pl->is_big()) momentum += 1;
79 Portable* po = pl->get_grabbed_object();
80 MovingObject* pomo = dynamic_cast<MovingObject*>(po);
81 if (contacts.insert(pomo).second) momentum += 1;
84 if (contacts.insert(&other).second) momentum += 1;
89 BicyclePlatform::update(float elapsed_time)
92 Sector::current()->add_object(new BicyclePlatform(this));
99 angle = master->angle + M_PI;
100 while (angle < 0) { angle += 2*M_PI; }
101 while (angle > 2*M_PI) { angle -= 2*M_PI; }
102 Vector dest = center + Vector(cosf(angle), sinf(angle)) * radius - (bbox.get_size() * 0.5);
103 movement = dest - get_pos();
105 if (this == master) {
106 float momentum_diff = momentum - slave->momentum;
107 contacts.clear(); momentum = 0;
108 slave->contacts.clear(); slave->momentum = 0;
110 float angular_momentum = cosf(angle) * momentum_diff;
112 angular_speed += (angular_momentum * elapsed_time) * M_PI;
113 angular_speed *= 1 - elapsed_time * 0.2;
114 angle += angular_speed * elapsed_time;
115 while (angle < 0) { angle += 2*M_PI; }
116 while (angle > 2*M_PI) { angle -= 2*M_PI; }
117 angular_speed = std::min(std::max(angular_speed, static_cast<float>(-128*M_PI*elapsed_time)), static_cast<float>(128*M_PI*elapsed_time));
118 Vector dest = center + Vector(cosf(angle), sinf(angle)) * radius - (bbox.get_size() * 0.5);
119 movement = dest - get_pos();
121 center += Vector(angular_speed, 0) * elapsed_time * 32;
122 slave->center += Vector(angular_speed, 0) * elapsed_time * 32;
127 IMPLEMENT_FACTORY(BicyclePlatform, "bicycle-platform");