random changes
[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 struct Derivative
54 {
55 Mf::Vector2 velocity;
56 Mf::Vector2 force;
57
58 Derivative operator*(Mf::Scalar dt) const
59 {
60 Derivative derivative;
61 derivative.velocity = dt * velocity;
62 derivative.force = dt * force;
63 return derivative;
64 }
65
66 Derivative operator+(const Derivative& other) const
67 {
68 Derivative derivative;
69 derivative.velocity = velocity + other.velocity;
70 derivative.force = force + other.force;
71 return derivative;
72 }
73 };
74
75 struct State
76 {
77 // primary
78
79 Mf::Vector2 position;
80 Mf::Vector2 momentum;
81 Mf::Vector2 force;
82
83 // secondary
84
85 Mf::Vector2 velocity;
86
87 // constant
88
89 Mf::Scalar mass;
90 Mf::Scalar inverseMass;
91
92 void recalculate()
93 {
94 velocity = momentum * inverseMass;
95 }
96
97
98 void getDerivative(Derivative& derivative, Mf::Scalar t) const
99 {
100 //derivative.velocity = Mf::Vector2(0.0, 0.0);
101 //derivative.force = Mf::Vector2(0.0, 0.0);
102 derivative.velocity = velocity;
103 derivative.force = force;
104
105 //Mf::Vector2 x = position - Mf::Vector2(500.0, 200.0);
106 //derivative.force += -15.0 * x - 1.5 * velocity;
107 }
108
109 void applyDerivative(const Derivative& derivative, Mf::Scalar dt)
110 {
111 position += dt * derivative.velocity;
112 momentum += dt * derivative.force;
113 recalculate();
114 }
115
116 // these two operator overloads all using the state in generic
117 // interpolator implementations
118
119 State operator*(Mf::Scalar scalar) const
120 {
121 State state = *this;
122 state.position *= scalar;
123 state.momentum *= scalar;
124 state.recalculate();
125 return state;
126 }
127
128 State operator+(const State& state) const
129 {
130 State newState = *this;
131 newState.position += state.position;
132 newState.momentum += state.momentum;
133 newState.recalculate();
134 return newState;
135 }
136 };
137
138 State previous;
139 State current;
140
141
142 private:
143
144 static const Mf::Scalar z = 96.0;
145
146 Mf::Tilemap tilemap_;
147 Mf::Animation animation_;
148
149 protected:
150
151 Mf::Vector2 userForce;
152
153 public:
154
155 Character(const std::string& name);
156 virtual ~Character() {}
157
158 virtual void update(Mf::Scalar t, Mf::Scalar dt);
159 virtual void draw(Mf::Scalar alpha) const;
160
161 Mf::Tilemap& getTilemap();
162 Mf::Animation& getAnimation();
163 };
164
165
166 #endif // _CHARACTER_HH_
167
168 /** vim: set ts=4 sw=4 tw=80: *************************************************/
169
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