Dogcows Code - chaz/yoink/blob - src/Character.cc

   1
   2 /*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
   3 **]  All rights reserved.
   4 *
   5 * vi:ts=4 sw=4 tw=75
   6 *
   7 * Distributable under the terms and conditions of the 2-clause BSD license;
   8 * see the file COPYING for a complete text of the license.
   9 *
  10 **************************************************************************/
  11
  12 #include <iostream>
  13
  14 #include "Character.hh"
  15 #include "Log.hh"
  16
  17
  18 class SpringForce
  19 {
  20 public:
  21
  22         explicit SpringForce(Mf::Vector2 x) :
  23                 location(x) {}
  24
  25         const Mf::Vector2& operator () (const Mf::LinearState<2>& state)
  26         {
  27                 Mf::Vector2 x = state.position - location;
  28                 Mf::Scalar mag = x.length();
  29                 Mf::Scalar d = 0.0;
  30
  31                 // spring:
  32                 //mState.force += -15.0 * x - 1.5 * mState.velocity;
  33                 force = SCALAR(-10.0) * (mag - d) * (x / mag);// - SCALAR(2.0) * state.velocity;
  34
  35                 return force;
  36         }
  37
  38 private:
  39
  40         Mf::Vector2 force;
  41         Mf::Vector2 location;
  42 };
  43
  44 class ResistanceForce
  45 {
  46 public:
  47
  48         explicit ResistanceForce(Mf::Scalar scale = 1.0) :
  49                 k(scale) {}
  50
  51         const Mf::Vector2& operator () (const Mf::LinearState<2>& state)
  52         {
  53                 force = -k * state.velocity;
  54                 return force;
  55         }
  56
  57 private:
  58
  59         Mf::Vector2     force;
  60         Mf::Scalar      k;
  61 };
  62
  63
  64 Character::Character(const std::string& name) :
  65         tilemap(name),
  66         animation(name)
  67 {
  68         mState.init();
  69
  70         mState.mass = 1.0;
  71         mState.inverseMass = 1.0 / mState.mass;
  72
  73         // forces
  74         mState.force = Mf::Vector2(0.0, 0.0);
  75         //mState.forces.push_back(SpringForce(Mf::Vector2(5.0, 4.0)));
  76         mState.forces.push_back(ResistanceForce(2.0));
  77         //mState.forces.push_back(Mf::LinearState<2>::GravityForce(-9.8));
  78
  79         // starting position
  80         mState.position = Mf::Vector2(5.0, 5.0);
  81         mState.momentum = Mf::Vector2(0.0, 0.0);
  82         mState.recalculate();
  83
  84         mPrevState = mState;
  85 }
  86
  87
  88 void Character::update(Mf::Scalar t, Mf::Scalar dt)
  89 {
  90         Mf::RigidBody2::update(t, dt); // update physics
  91
  92         animation.update(t, dt);
  93
  94         Mf::Vector3 center(mState.position[0], mState.position[1], 0.0);
  95         Mf::Vector3 a(mState.position[0] - 0.5, mState.position[1] - 0.5, 0.0);
  96         Mf::Vector3 b(mState.position[0] + 0.5, mState.position[1] + 0.5, 0.0);
  97
  98         mAabb.init(a, b);
  99         mSphere.init(center, a);
 100 }
 101
 102
 103 void Character::draw(Mf::Scalar alpha) const
 104 {
 105         Mf::State2 state = getState(alpha);
 106         Mf::Vector2 position = state.position;
 107
 108         //glColor3f(1.0f, 1.0f, 1.0f);
 109         tilemap.bind();
 110
 111         Mf::Texture::TileIndex frame = animation.getFrame();
 112         Mf::Texture::Orientation orientation = Mf::Texture::NORMAL;
 113
 114         if (mState.velocity[0] < 0.0) orientation = Mf::Texture::REVERSE;
 115
 116         Mf::Scalar coords[8];
 117         tilemap.getTileCoords(frame, coords, orientation);
 118
 119         Mf::Scalar s = 0.5;
 120
 121         glBegin(GL_TRIANGLE_FAN);
 122                 glTexCoord(coords[0], coords[1]);
 123                 glVertex(position[0]-s, position[1]-s);
 124                 glTexCoord(coords[2], coords[3]);
 125                 glVertex(position[0]+s, position[1]-s);
 126                 glTexCoord(coords[4], coords[5]);
 127                 glVertex(position[0]+s, position[1]+s);
 128                 glTexCoord(coords[6], coords[7]);
 129                 glVertex(position[0]-s, position[1]+s);
 130         glEnd();
 131 }
 132
 133
 134 /*int Character::getOctant(const Mf::Aabb<3>& aabb) const
 135 {
 136         int octantNum = -1;
 137
 138         Mf::Plane::Halfspace halfspace;
 139
 140         Mf::Plane xy = aabb.getPlaneXY();
 141         halfspace = xy.intersects(mSphere);
 142         if (halfspace == Mf::Plane::INTERSECT)
 143         {
 144                 halfspace = xy.intersects(mAabb);
 145         }
 146
 147         if (halfspace == Mf::Plane::POSITIVE)
 148         {
 149                 Mf::Plane xz = aabb.getPlaneXZ();
 150                 halfspace = xz.intersects(mSphere);
 151                 if (halfspace == Mf::Plane::INTERSECT)
 152                 {
 153                         halfspace = xz.intersects(mAabb);
 154                 }
 155
 156                 if (halfspace == Mf::Plane::POSITIVE)
 157                 {
 158                         Mf::Plane yz = aabb.getPlaneYZ();
 159                         halfspace = yz.intersects(mSphere);
 160                         if (halfspace == Mf::Plane::INTERSECT)
 161                         {
 162                                 halfspace = yz.intersects(mAabb);
 163                         }
 164
 165                         if (halfspace == Mf::Plane::POSITIVE)
 166                         {
 167                                 octantNum = 2;
 168                         }
 169                         else if (halfspace == Mf::Plane::NEGATIVE)
 170                         {
 171                                 octantNum = 3;
 172                         }
 173                 }
 174                 else if (halfspace == Mf::Plane::NEGATIVE)
 175                 {
 176                         Mf::Plane yz = aabb.getPlaneYZ();
 177                         halfspace = yz.intersects(mSphere);
 178                         if (halfspace == Mf::Plane::INTERSECT)
 179                         {
 180                                 halfspace = yz.intersects(mAabb);
 181                         }
 182
 183                         if (halfspace == Mf::Plane::POSITIVE)
 184                         {
 185                                 octantNum = 1;
 186                         }
 187                         else if (halfspace == Mf::Plane::NEGATIVE)
 188                         {
 189                                 octantNum = 0;
 190                         }
 191                 }
 192         }
 193         else if (halfspace == Mf::Plane::NEGATIVE)
 194         {
 195                 Mf::Plane xz = aabb.getPlaneXZ();
 196                 halfspace = xz.intersects(mSphere);
 197                 if (halfspace == Mf::Plane::INTERSECT)
 198                 {
 199                         halfspace = xz.intersects(mAabb);
 200                 }
 201
 202                 if (halfspace == Mf::Plane::POSITIVE)
 203                 {
 204                         Mf::Plane yz = aabb.getPlaneYZ();
 205                         halfspace = yz.intersects(mSphere);
 206                         if (halfspace == Mf::Plane::INTERSECT)
 207                         {
 208                                 halfspace = yz.intersects(mAabb);
 209                         }
 210
 211                         if (halfspace == Mf::Plane::POSITIVE)
 212                         {
 213                                 octantNum = 6;
 214                         }
 215                         else if (halfspace == Mf::Plane::NEGATIVE)
 216                         {
 217                                 octantNum = 7;
 218                         }
 219                 }
 220                 else if (halfspace == Mf::Plane::NEGATIVE)
 221                 {
 222                         Mf::Plane yz = aabb.getPlaneYZ();
 223                         halfspace = yz.intersects(mSphere);
 224                         if (halfspace == Mf::Plane::INTERSECT)
 225                         {
 226                                 halfspace = yz.intersects(mAabb);
 227                         }
 228
 229                         if (halfspace == Mf::Plane::POSITIVE)
 230                         {
 231                                 octantNum = 5;
 232                         }
 233                         else if (halfspace == Mf::Plane::NEGATIVE)
 234                         {
 235                                 octantNum = 4;
 236                         }
 237                 }
 238         }
 239
 240         return octantNum;
 241 }
 242 */
 243
 244
 245 void Character::addImpulse(Mf::Vector2 impulse)
 246 {
 247         mState.momentum += impulse;
 248 }
 249
 250 void Character::addForce(Mf::Vector2 force)
 251 {
 252         mState.force += force;
 253 }
 254
 255 void Character::setPosition(Mf::Vector2 position)
 256 {
 257         mState.position = position;
 258 }
 259