1 //  SuperTux - BicyclePlatform
2 //  Copyright (C) 2007 Christoph Sommer <christoph.sommer@2007.expires.deltadevelopment.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 #ifndef HEADER_SUPERTUX_OBJECT_BICYCLE_PLATFORM_HPP
18 #define HEADER_SUPERTUX_OBJECT_BICYCLE_PLATFORM_HPP
19 
20 #include "object/path_walker.hpp"
21 #include "object/moving_sprite.hpp"
22 
23 class BicyclePlatform;
24 
25 class BicyclePlatformChild : public MovingSprite
26 {
27   friend class BicyclePlatform;
28 
29 public:
30   BicyclePlatformChild(const ReaderMapping& reader, float angle_offset, BicyclePlatform& parent);
31 
32   virtual void update(float dt_sec) override;
33   virtual HitResponse collision(GameObject& other, const CollisionHit& hit) override;
is_saveable() const34   virtual bool is_saveable() const override { return false; }
35 
36   virtual void editor_delete() override;
37 
38 private:
39   BicyclePlatform& m_parent;
40   float m_angle_offset;
41   float m_momentum; /** angular momentum in rad per second per second*/
42   std::set<GameObject*> m_contacts; /**< objects that are currently pushing on the platform */
43 
44 private:
45   BicyclePlatformChild(const BicyclePlatformChild&) = delete;
46   BicyclePlatformChild& operator=(const BicyclePlatformChild&) = delete;
47 };
48 
49 /**
50  * Used to construct a pair of bicycle platforms: If one is pushed down, the other one rises
51  */
52 class BicyclePlatform final : public GameObject
53 {
54   friend class BicyclePlatformChild;
55 
56 public:
57   BicyclePlatform(const ReaderMapping& reader);
58   ~BicyclePlatform() override;
59 
60   virtual void draw(DrawingContext& context) override;
61   virtual void update(float dt_sec) override;
62   virtual void on_flip(float height) override;
63 
get_class() const64   virtual std::string get_class() const override { return "bicycle-platform"; }
get_display_name() const65   virtual std::string get_display_name() const override { return _("Bicycle Platform"); }
66 
67   virtual ObjectSettings get_settings() override;
68   virtual void editor_delete() override;
69   virtual void after_editor_set() override;
70 
71 private:
72   Vector m_center; /**< pivot point */
73   float m_radius; /**< radius of circle */
74 
75   float m_angle; /**< current angle */
76   float m_angular_speed; /**< angular speed in rad per second */
77 
78   float m_momentum_change_rate; /** Change in momentum every step **/
79 
80   std::vector<BicyclePlatformChild*> m_children;
81   std::unique_ptr<PathWalker> m_walker;
82   int m_platforms;
83 
84 private:
85   BicyclePlatform(const BicyclePlatform&) = delete;
86   BicyclePlatform& operator=(const BicyclePlatform&) = delete;
87 };
88 
89 #endif
90 
91 /* EOF */
92