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/Physics.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
  94                 void getDerivative(Derivative& derivative, Mf::Scalar t) const
  95                 {
  96                         //derivative.velocity = Mf::Vector2(0.0, 0.0);
  97                         //derivative.force = Mf::Vector2(0.0, 0.0);
  98                         derivative.velocity = velocity;
  99                         derivative.force = force;
 100                 }
 101
 102                 void recalculate()
 103                 {
 104                         velocity = momentum * inverseMass;
 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                 State operator*(Mf::Scalar scalar) const
 115                 {
 116                         State state = *this;
 117                         state.position *= scalar;
 118                         state.momentum *= scalar;
 119                         state.recalculate();
 120                         return state;
 121                 }
 122
 123                 State operator+(State state) const
 124                 {
 125                         State newState = *this;
 126                         newState.position +=  state.position;
 127                         newState.momentum +=  state.momentum;
 128                         newState.recalculate();
 129                         return newState;
 130                 }
 131         };
 132
 133         State                   previous;
 134         State                   current;
 135
 136         stlplus::ntree<Mf::OctreeNode>::iterator treeNode;
 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 public:
 149
 150         inline static CharacterP alloc(const std::string& name)
 151         {
 152                 return CharacterP(new Character(name));
 153         }
 154
 155         Character(const std::string& name);
 156         virtual ~Character();
 157
 158         void update(Mf::Scalar t, Mf::Scalar dt);
 159         void handleEvent(const Mf::Event& event);
 160         void draw(Mf::Scalar alpha) const;
 161
 162         Mf::Tilemap& getTilemap();
 163         Mf::Animation& getAnimation();
 164 };
 165
 166
 167 inline Character::State operator*(Mf::Scalar scalar, const Character::State& state)
 168 {
 169         Character::State newState = state;
 170         newState.position *= scalar;
 171         newState.momentum *= scalar;
 172         newState.recalculate();
 173         return newState;
 174 }
 175
 176
 177 #endif // _CHARACTER_HH_
 178
 179 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 180