collision.cpp

   1 #include "collision.h"
   2
   3 void CollisionManager::subscribe(Thing* thing){
   4         things.insert(thing);
   5 }
   6
   7 void CollisionManager::remove(Thing* thing){
   8         things.erase(thing);
   9 }
  10
  11 void CollisionManager::update(){
  12         std::set<Thing*>::iterator it1,it2;
  13         for (it1 = things.begin(); it1 != things.end(); it1++) {
  14                 for (it2 = it1; it2 != things.end(); it2++) {
  15                         if (*it1 == *it2) continue;
  16                         checkCollision(*it1,*it2);
  17                 }
  18         }
  19 }
  20
  21 bool pointInsidePolygon(Ponto ponto, Polygon p) {
  22         std::vector<Linha>::iterator it;
  23         Ponto infinito(0xffffff,ponto.y);
  24         int inter = 0;
  25         Linha toinfinity(ponto,infinito);
  26         for (it = p.linhas.begin(); it != p.linhas.end(); it++) {
  27                 if (linesIntersect(*it,toinfinity)) {
  28                         inter++;
  29                 }
  30         }
  31         if (inter % 2 == 1)
  32                 return true;
  33         else
  34                 return false;
  35 }
  36
  37 bool CollisionManager::checkCollision(Thing* a, Thing* b){
  38         Polygon pa,pb;
  39         pa = a->getCollision();
  40         pb = b->getCollision();
  41         pa.translate(a->getPosition());
  42         pb.translate(b->getPosition());
  43         std::vector<Linha>::iterator ita,itb;
  44         if (pointInsidePolygon(pb.linhas[0].vertices[0],pa)) {
  45                 a->collide(b);
  46                 b->collide(a);
  47                 return true;
  48         }
  49         for (ita = pa.linhas.begin(); ita != pa.linhas.end(); ita++) {
  50                 for (itb = pb.linhas.begin(); itb != pb.linhas.end(); itb++) {
  51                         /*std::cout<<"A:"<<(*ita).vertices[0].x<<" "<<(*ita).vertices[0].y<<" "
  52                                          <<(*ita).vertices[1].x<<" "<<(*ita).vertices[1].y<<std::endl;
  53                         std::cout<<"B:"<<(*itb).vertices[0].x<<" "<<(*itb).vertices[0].y<<" "
  54                                          <<(*itb).vertices[1].x<<" "<<(*itb).vertices[1].y<<std::endl;*/
  55                         if (linesIntersect(*ita,*itb)) {
  56                                 a->collide(b);
  57                                 b->collide(a);
  58                                 return true;
  59                         }
  60                 }
  61         }
  62         return false;
  63 }