src/core/PhysicsSimulation.cpp

   1 // Copyright 2008 Brian Caine
   2
   3 // This file is part of Potpourri.
   4
   5 // Potpourri is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9
  10 // Potpourri is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTIBILITY of FITNESS FOR A PARTICULAR PURPOSE. See the
  13 // GNU General Public License for more details.
  14
  15 // You should have received a copy of the GNU General Public License
  16 // along with Potpourri. If not, see <http://www.gnu.org/licenses/>.
  17
  18
  19 // NOTES:
  20 // sauce
  21
  22 #include "../../include/core/PhysicsSimulation.h"
  23 #include <stdexcept>
  24
  25 using namespace fragrant;
  26
  27 PhysicsSimulation::PhysicsSimulation()
  28 {
  29   if (!initted)
  30     {
  31       cpInitChipmunk();
  32       initted = true;
  33     }
  34
  35   space = cpSpaceNew();
  36   if (!space)
  37     throw std::runtime_error(
  38       "PhysicsSimulation::PhysicsSimulation(): couldn't make space");
  39
  40   space->gravity = cpv(GRAVITY.x, GRAVITY.y);
  41 }
  42
  43 PhysicsSimulation::~PhysicsSimulation()
  44 {
  45   if (space)
  46     cpSpaceFree(space);
  47 }
  48
  49 void PhysicsSimulation::process(float max, float increment)
  50 {
  51   float tcur;
  52
  53   for (tcur = 0.0; tcur < max; tcur += increment)
  54     {
  55       int cur;
  56       for (cur = 0; cur < objects.size(); cur++)
  57         cpBodyResetForces(objects.at(cur)->body);
  58
  59       cpSpaceStep(space, increment);
  60     }
  61
  62   return;
  63 }
  64
  65 void PhysicsSimulation::addPhysicsObject(PhysicsObject* object)
  66 {
  67   objects.push_back(object);
  68
  69   object->parent = this;
  70   object->addToSpace(space);
  71 }
  72
  73 void PhysicsSimulation::removePhysicsObject(PhysicsObject* object)
  74 {
  75   std::vector<PhysicsObject*>::iterator iter;
  76   std::vector<std::vector<PhysicsObject*>::iterator> to_del;
  77   for (iter = objects.begin(); iter != objects.end(); iter++)
  78     if (*iter == object)
  79       to_del.push_back(iter);
  80
  81   int cur;
  82   for (cur = (to_del.size() - 1); cur >= 0; cur--)
  83     objects.erase(to_del.at(cur));
  84
  85   object->parent = 0;
  86   object->removeFromSpace(space);
  87
  88   return;
  89 }
  90
  91 bool PhysicsSimulation::initted = false;