starting to move to a generic state structure
[chaz/yoink] / src / Character.hh
1
2 /*******************************************************************************
3
4 Copyright (c) 2009, Charles McGarvey
5 All rights reserved.
6
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
9
10 * Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 * Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
15
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27 *******************************************************************************/
28
29 #ifndef _CHARACTER_HH_
30 #define _CHARACTER_HH_
31
32 #include <boost/shared_ptr.hpp>
33
34 #include <Moof/Animation.hh>
35 #include <Moof/Entity.hh>
36 #include <Moof/Event.hh>
37 #include <Moof/Math.hh>
38 #include <Moof/RK4.hh>
39 #include <Moof/Tilemap.hh>
40
41
42 struct Character;
43 typedef boost::shared_ptr<Character> CharacterP;
44
45
46 /**
47 * Parent class of animate objects with "personalities." This basically
48 * includes the heroine herself and the bad guys.
49 */
50
51 struct Character : public Mf::Entity
52 {
53 /*
54 struct Derivative
55 {
56 Mf::Vector2 velocity;
57 Mf::Vector2 force;
58
59 Derivative operator*(Mf::Scalar dt) const
60 {
61 Derivative derivative;
62 derivative.velocity = dt * velocity;
63 derivative.force = dt * force;
64 return derivative;
65 }
66
67 Derivative operator+(const Derivative& other) const
68 {
69 Derivative derivative;
70 derivative.velocity = velocity + other.velocity;
71 derivative.force = force + other.force;
72 return derivative;
73 }
74 };
75
76 struct State
77 {
78 // primary
79
80 Mf::Vector2 position;
81 Mf::Vector2 momentum;
82 Mf::Vector2 force;
83
84 // secondary
85
86 Mf::Vector2 velocity;
87
88 // constant
89
90 Mf::Scalar mass;
91 Mf::Scalar inverseMass;
92
93 void recalculate()
94 {
95 velocity = momentum * inverseMass;
96 }
97
98
99 void getDerivative(Derivative& derivative, Mf::Scalar t) const
100 {
101 //derivative.velocity = Mf::Vector2(0.0, 0.0);
102 //derivative.force = Mf::Vector2(0.0, 0.0);
103 derivative.velocity = velocity;
104 derivative.force = force;
105
106 //Mf::Vector2 x = position - Mf::Vector2(500.0, 200.0);
107 //derivative.force += -15.0 * x - 1.5 * velocity;
108 }
109
110 void applyDerivative(const Derivative& derivative, Mf::Scalar dt)
111 {
112 position += dt * derivative.velocity;
113 momentum += dt * derivative.force;
114 recalculate();
115 }
116
117 // these two operator overloads all using the state in generic
118 // interpolator implementations
119
120 State operator*(Mf::Scalar scalar) const
121 {
122 State state = *this;
123 state.position *= scalar;
124 state.momentum *= scalar;
125 state.recalculate();
126 return state;
127 }
128
129 State operator+(const State& state) const
130 {
131 State newState = *this;
132 newState.position += state.position;
133 newState.momentum += state.momentum;
134 newState.recalculate();
135 return newState;
136 }
137 };
138 */
139
140 Mf::State2 previous;
141 Mf::State2 current;
142
143
144 private:
145
146 static const Mf::Scalar z = 96.0;
147
148 Mf::Tilemap tilemap_;
149 Mf::Animation animation_;
150
151 protected:
152
153 Mf::Vector2 userForce;
154
155 public:
156
157 Character(const std::string& name);
158 virtual ~Character() {}
159
160 virtual void update(Mf::Scalar t, Mf::Scalar dt);
161 virtual void draw(Mf::Scalar alpha) const;
162
163 Mf::Tilemap& getTilemap();
164 Mf::Animation& getAnimation();
165 };
166
167
168 #endif // _CHARACTER_HH_
169
170 /** vim: set ts=4 sw=4 tw=80: *************************************************/
171
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