Dogcows Code - chaz/yoink/blob - 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
 106                 void applyDerivative(const Derivative& derivative, Mf::Scalar dt)
 107                 {
 108                         position += dt * derivative.velocity;
 109                         momentum += dt * derivative.force;
 110                         recalculate();
 111                 }
 112
 113                 // these two operator overloads all using the state in generic
 114                 // interpolator implementations
 115
 116                 State operator*(Mf::Scalar scalar) const
 117                 {
 118                         State state = *this;
 119                         state.position *= scalar;
 120                         state.momentum *= scalar;
 121                         state.recalculate();
 122                         return state;
 123                 }
 124
 125                 State operator+(const State& state) const
 126                 {
 127                         State newState = *this;
 128                         newState.position +=  state.position;
 129                         newState.momentum +=  state.momentum;
 130                         newState.recalculate();
 131                         return newState;
 132                 }
 133         };
 134
 135         State                   previous;
 136         State                   current;
 137
 138
 139 private:
 140
 141         static const Mf::Scalar z = 96.0;
 142
 143         Mf::Tilemap             tilemap_;
 144         Mf::Animation   animation_;
 145
 146         //void updateContainers();
 147
 148 protected:
 149
 150         Mf::Vector2 userForce;
 151
 152 public:
 153
 154         Character(const std::string& name);
 155         virtual ~Character() {}
 156
 157         virtual void update(Mf::Scalar t, Mf::Scalar dt);
 158         virtual void draw(Mf::Scalar alpha) const;
 159
 160         Mf::Tilemap& getTilemap();
 161         Mf::Animation& getAnimation();
 162 };
 163
 164
 165 //inline Character::State operator*(Mf::Scalar scalar,
 166                 //const Character::State& state)
 167 //{
 168         //Character::State newState = state;
 169         //newState.position *= scalar;
 170         //newState.momentum *= scalar;
 171         //newState.recalculate();
 172         //return newState;
 173 //}
 174
 175
 176 #endif // _CHARACTER_HH_
 177
 178 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 179