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