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/Octree.hh>
  39 #include <Moof/RK4.hh>
  40 #include <Moof/Tilemap.hh>
  41
  42
  43 struct Character;
  44 typedef boost::shared_ptr<Character> CharacterP;
  45
  46
  47 /**
  48  * Parent class of animate objects with "personalities."  This basically
  49  * includes the heroine herself and the bad guys.
  50  */
  51
  52 struct Character : public Mf::Entity
  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
 107                 void applyDerivative(const Derivative& derivative, Mf::Scalar dt)
 108                 {
 109                         position += dt * derivative.velocity;
 110                         momentum += dt * derivative.force;
 111                         recalculate();
 112                 }
 113
 114                 // these two operator overloads all using the state in generic
 115                 // interpolator implementations
 116
 117                 State operator*(Mf::Scalar scalar) const
 118                 {
 119                         State state = *this;
 120                         state.position *= scalar;
 121                         state.momentum *= scalar;
 122                         state.recalculate();
 123                         return state;
 124                 }
 125
 126                 State operator+(const State& state) const
 127                 {
 128                         State newState = *this;
 129                         newState.position +=  state.position;
 130                         newState.momentum +=  state.momentum;
 131                         newState.recalculate();
 132                         return newState;
 133                 }
 134         };
 135
 136         State                   previous;
 137         State                   current;
 138
 139         Mf::OctreeNodeP treeNode;
 140
 141
 142 private:
 143
 144         static const Mf::Scalar z = 96.0;
 145
 146         Mf::Vector2 userForce;
 147
 148         Mf::Tilemap             tilemap_;
 149         Mf::Animation   animation_;
 150
 151         void updateContainers();
 152
 153 public:
 154
 155         static CharacterP alloc(const std::string& name)
 156         {
 157                 return CharacterP(new Character(name));
 158         }
 159
 160         Character(const std::string& name);
 161         virtual ~Character() {}
 162
 163         void update(Mf::Scalar t, Mf::Scalar dt);
 164         void handleEvent(const Mf::Event& event);
 165         void draw(Mf::Scalar alpha) const;
 166
 167         Mf::Tilemap& getTilemap();
 168         Mf::Animation& getAnimation();
 169 };
 170
 171
 172 //inline Character::State operator*(Mf::Scalar scalar,
 173                 //const Character::State& state)
 174 //{
 175         //Character::State newState = state;
 176         //newState.position *= scalar;
 177         //newState.momentum *= scalar;
 178         //newState.recalculate();
 179         //return newState;
 180 //}
 181
 182
 183 #endif // _CHARACTER_HH_
 184
 185 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 186