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                         //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