1 // SuperTux - BicyclePlatform
2 // Copyright (C) 2007 Christoph Sommer <christoph.sommer@2007.expires.deltadevelopment.de>
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.
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.
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/>.
17 #include "object/bicycle_platform.hpp"
21 #include "object/player.hpp"
22 #include "object/portable.hpp"
23 #include "supertux/object_factory.hpp"
24 #include "supertux/sector.hpp"
26 BicyclePlatform::BicyclePlatform(const Reader& reader) :
27 MovingSprite(reader, LAYER_OBJECTS, COLGROUP_STATIC),
40 BicyclePlatform::BicyclePlatform(BicyclePlatform* master) :
41 MovingSprite(*master),
44 center(master->center),
45 radius(master->radius),
46 angle(master->angle + M_PI),
51 set_pos(get_pos() + Vector(master->get_bbox().get_width(), 0));
52 master->master = master;
56 BicyclePlatform::~BicyclePlatform()
58 if ((this == master) && (master)) {
62 if ((master) && (this == slave)) {
71 BicyclePlatform::collision(GameObject& other, const CollisionHit& )
74 // somehow the hit parameter does not get filled in, so to determine (hit.top == true) we do this:
75 MovingObject* mo = dynamic_cast<MovingObject*>(&other);
76 if (!mo) return FORCE_MOVE;
77 if ((mo->get_bbox().p2.y) > (get_bbox().p1.y + 2)) return FORCE_MOVE;
79 Player* pl = dynamic_cast<Player*>(mo);
81 if (pl->is_big()) momentum += 1;
82 Portable* po = pl->get_grabbed_object();
83 MovingObject* pomo = dynamic_cast<MovingObject*>(po);
84 if (contacts.insert(pomo).second) momentum += 1;
87 if (contacts.insert(&other).second) momentum += 1;
92 BicyclePlatform::update(float elapsed_time)
95 Sector::current()->add_object(new BicyclePlatform(this));
102 angle = master->angle + M_PI;
103 while (angle < 0) { angle += 2*M_PI; }
104 while (angle > 2*M_PI) { angle -= 2*M_PI; }
105 Vector dest = center + Vector(cosf(angle), sinf(angle)) * radius - (bbox.get_size() * 0.5);
106 movement = dest - get_pos();
108 if (this == master) {
109 float momentum_diff = momentum - slave->momentum;
110 contacts.clear(); momentum = 0;
111 slave->contacts.clear(); slave->momentum = 0;
113 float angular_momentum = cosf(angle) * momentum_diff;
115 angular_speed += (angular_momentum * elapsed_time) * M_PI;
116 angular_speed *= 1 - elapsed_time * 0.2;
117 angle += angular_speed * elapsed_time;
118 while (angle < 0) { angle += 2*M_PI; }
119 while (angle > 2*M_PI) { angle -= 2*M_PI; }
120 angular_speed = std::min(std::max(angular_speed, static_cast<float>(-128*M_PI*elapsed_time)), static_cast<float>(128*M_PI*elapsed_time));
121 Vector dest = center + Vector(cosf(angle), sinf(angle)) * radius - (bbox.get_size() * 0.5);
122 movement = dest - get_pos();
124 center += Vector(angular_speed, 0) * elapsed_time * 32;
125 slave->center += Vector(angular_speed, 0) * elapsed_time * 32;
130 IMPLEMENT_FACTORY(BicyclePlatform, "bicycle-platform");