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         if (a->dead || b->dead)
  39                 return false;
  40         if (!(a->canCollide(b) && b->canCollide(a)))
  41                 return false;
  42         if (distance(a->getPosition(),b->getPosition()) > 500)
  43                 return false;
  44         Polygon pa,pb;
  45         pa = a->getCollision();
  46         pb = b->getCollision();
  47         pa.translate(a->getPosition());
  48         pb.translate(b->getPosition());
  49         std::vector<Linha>::iterator ita,itb;
  50         if (pointInsidePolygon(pb.linhas[0].vertices[0],pa)) {
  51                 a->collide(b);
  52                 b->collide(a);
  53                 return true;
  54         }
  55         for (ita = pa.linhas.begin(); ita != pa.linhas.end(); ita++) {
  56                 for (itb = pb.linhas.begin(); itb != pb.linhas.end(); itb++) {
  57                         /*std::cout<<"A:"<<(*ita).vertices[0].x<<" "<<(*ita).vertices[0].y<<" "
  58                                          <<(*ita).vertices[1].x<<" "<<(*ita).vertices[1].y<<std::endl;
  59                         std::cout<<"B:"<<(*itb).vertices[0].x<<" "<<(*itb).vertices[0].y<<" "
  60                                          <<(*itb).vertices[1].x<<" "<<(*itb).vertices[1].y<<std::endl;*/
  61                         if (linesIntersect(*ita,*itb)) {
  62                                 a->collide(b);
  63                                 b->collide(a);
  64                                 return true;
  65                         }
  66                 }
  67         }
  68         return false;
  69 }