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 /**
  44  * Parent class of animate objects with "personalities."  This basically
  45  * includes the heroine herself and the bad guys.
  46  */
  47
  48 class Character : public Mf::Entity
  49 {
  50 public:
  51
  52         struct Derivative
  53         {
  54                 Mf::Vector2 velocity;
  55                 Mf::Vector2 force;
  56
  57                 Derivative operator*(Mf::Scalar dt) const
  58                 {
  59                         Derivative derivative;
  60                         derivative.velocity = dt * velocity;
  61                         derivative.force = dt * force;
  62                         return derivative;
  63                 }
  64
  65                 Derivative operator+(const Derivative& other) const
  66                 {
  67                         Derivative derivative;
  68                         derivative.velocity = velocity + other.velocity;
  69                         derivative.force = force + other.force;
  70                         return derivative;
  71                 }
  72         };
  73
  74         struct State
  75         {
  76                 // primary
  77
  78                 Mf::Vector2 position;
  79                 Mf::Vector2 momentum;
  80                 Mf::Vector2 force;
  81
  82                 // secondary
  83
  84                 Mf::Vector2 velocity;
  85
  86                 // constant
  87
  88                 Mf::Scalar      mass;
  89                 Mf::Scalar      inverseMass;
  90
  91
  92                 void getDerivative(Derivative& derivative, Mf::Scalar t) const
  93                 {
  94                         //derivative.velocity = Mf::Vector2(0.0, 0.0);
  95                         //derivative.force = Mf::Vector2(0.0, 0.0);
  96                         derivative.velocity = velocity;
  97                         derivative.force = force;
  98                 }
  99
 100                 void recalculate()
 101                 {
 102                         velocity = momentum * inverseMass;
 103                 }
 104
 105                 void applyDerivative(const Derivative& derivative, Mf::Scalar dt)
 106                 {
 107                         position += dt * derivative.velocity;
 108                         momentum += dt * derivative.force;
 109                         recalculate();
 110                 }
 111
 112                 State operator*(Mf::Scalar scalar) const
 113                 {
 114                         State state = *this;
 115                         state.position *= scalar;
 116                         state.momentum *= scalar;
 117                         state.recalculate();
 118                         return state;
 119                 }
 120
 121                 State operator+(State state) const
 122                 {
 123                         State newState = *this;
 124                         newState.position +=  state.position;
 125                         newState.momentum +=  state.momentum;
 126                         newState.recalculate();
 127                         return newState;
 128                 }
 129         };
 130
 131
 132         Character(const std::string& name);
 133         virtual ~Character();
 134
 135         void update(Mf::Scalar t, Mf::Scalar dt);
 136         void handleEvent(const Mf::Event& event);
 137         void draw(Mf::Scalar alpha) const;
 138
 139         Mf::Tilemap& getTilemap();
 140         Mf::Animation& getAnimation();
 141
 142         State                   previous;
 143         State                   current;
 144
 145         stlplus::ntree<Mf::OctreeNode>::iterator treeNode;
 146
 147 private:
 148
 149         void updateContainers();
 150
 151         static const Mf::Scalar z = 96.0;
 152
 153         Mf::Tilemap             tilemap_;
 154         Mf::Animation   animation_;
 155 };
 156
 157 typedef boost::shared_ptr<Character> CharacterPtr;
 158
 159
 160 inline Character::State operator*(Mf::Scalar scalar, const Character::State& state)
 161 {
 162         Character::State newState = state;
 163         newState.position *= scalar;
 164         newState.momentum *= scalar;
 165         newState.recalculate();
 166         return newState;
 167 }
 168
 169
 170 #endif // _CHARACTER_HH_
 171
 172 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 173