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

   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 #include <iostream>
  30
  31 #include "Character.hh"
  32 #include "Log.hh"
  33
  34
  35 struct SpringForce
  36 {
  37         explicit SpringForce(Mf::Vector2 x) :
  38                 location(x) {}
  39
  40         const Mf::Vector2& operator () (const Mf::LinearState<2>& state)
  41         {
  42                 Mf::Vector2 x = state.position - location;
  43                 Mf::Scalar mag = x.length();
  44                 Mf::Scalar d = 50.0;
  45
  46                 // spring:
  47                 //current.force += -15.0 * x - 1.5 * current.velocity;
  48                 force = -20.0 * (mag - d) * (x / mag) - 2.0 * state.velocity;
  49
  50                 return force;
  51         }
  52
  53 private:
  54
  55         Mf::Vector2 force;
  56         Mf::Vector2 location;
  57 };
  58
  59 struct ResistanceForce
  60 {
  61         explicit ResistanceForce(Mf::Scalar scale = 1.0) :
  62                 k(scale) {}
  63
  64         const Mf::Vector2& operator () (const Mf::LinearState<2>& state)
  65         {
  66                 force = -k * state.velocity;
  67                 return force;
  68         }
  69
  70 private:
  71
  72         Mf::Vector2     force;
  73         Mf::Scalar      k;
  74 };
  75
  76
  77 Character::Character(const std::string& name) :
  78         tilemap(name),
  79         animation(name)
  80 {
  81         current.init();
  82
  83         current.mass = 1.0;
  84         current.inverseMass = 1.0 / current.mass;
  85
  86         // gravity
  87         current.force = Mf::Vector2(0.0, 000.0);
  88         current.forces.push_back(SpringForce(Mf::Vector2(500.0, 200.0)));
  89         current.forces.push_back(ResistanceForce(4.0));
  90         current.forces.push_back(Mf::LinearState<2>::GravityForce(-2000.0));
  91
  92         // starting position
  93         current.position = Mf::Vector2(64.0, 64.0);
  94         current.momentum = Mf::Vector2(0.0, 0.0);
  95         current.recalculate();
  96
  97         previous = current;
  98 }
  99
 100
 101 void Character::update(Mf::Scalar t, Mf::Scalar dt)
 102 {
 103         previous = current;
 104
 105         //Mf::Vector2 x = current.position - Mf::Vector2(500.0, 200.0);
 106         //Mf::Scalar mag = x.length();
 107         //Mf::Scalar d = 50.0;
 108
 109         //// gravity:
 110         //current.force = Mf::Vector2(0.0, -2000.0);
 111         //// spring:
 112         ////current.force += -15.0 * x - 1.5 * current.velocity;
 113         //current.force += -20.0 * (mag - d) * (x / mag) - 2.0 * current.velocity;
 114         //// internal:
 115         //current.force += userForce;
 116         //current.recalculate();
 117         //std::cout << "force: " << current.momentum << std::endl;
 118
 119         //Mf::euler<State,Derivative>(current, t, dt);
 120
 121         current.integrate(t, dt);
 122         animation.update(t, dt);
 123 }
 124
 125
 126 void Character::draw(Mf::Scalar alpha) const
 127 {
 128         Mf::Vector2 position = cml::lerp(previous.position, current.position, alpha);
 129
 130         //glColor3f(1.0f, 1.0f, 1.0f);
 131         tilemap.bind();
 132
 133         Tilemap::Index frame = animation.getFrame();
 134
 135         Tilemap::Orientation orientation = Tilemap::NORMAL;
 136
 137         if (current.velocity[0] < 0.0) orientation = Tilemap::REVERSE;
 138
 139         Mf::Scalar coords[8];
 140         tilemap.getTileCoords(frame, coords, orientation);
 141
 142         Mf::Scalar s = 16.0;
 143
 144         glBegin(GL_TRIANGLE_FAN);
 145                 glTexCoord2f(coords[0], coords[1]);
 146                 glVertex3(position[0]-s, position[1]-s, z);
 147                 glTexCoord2f(coords[2], coords[3]);
 148                 glVertex3(position[0]+s, position[1]-s, z);
 149                 glTexCoord2f(coords[4], coords[5]);
 150                 glVertex3(position[0]+s, position[1]+s, z);
 151                 glTexCoord2f(coords[6], coords[7]);
 152                 glVertex3(position[0]-s, position[1]+s, z);
 153         glEnd();
 154
 155         //glColor3f(0.0f, 0.0f, 0.0f);
 156         Mf::Texture::resetBind();
 157
 158         glBegin(GL_TRIANGLES);
 159                 glVertex3(480.0, 190.0, 64.0);
 160                 glVertex3(520.0, 190.0, 64.0);
 161                 glVertex3(500.0, 210.0, 64.0);
 162         glEnd();
 163
 164         //glColor3f(1.0f, 1.0f, 1.0f);
 165 }
 166
 167
 168 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 169