void World::update()
{
for(int i=0; i < fishes.size(); ++i)
{
//各fishがどこの領域に属するかを更新
Fish* fish = fishes.at(i);
vec2d pos = fish->get_pos();
int pre_idx = fish->get_pidx();
int idx = pos.x / (int)(width / PARTITION_X)
+ (int)(pos.y / (int)(height / PARTITION_Y))*PARTITION_X;
if(pre_idx != idx)
{
partitons.at(pre_idx).erase(partitons.at(pre_idx).find(fish->get_id()));
partitons.at(idx).insert(std::make_pair(fish->get_id(), fish));
fish->set_pidx(idx);
}
fishes.at(i)->update(this);
}
for(int i=0; i < sharks.size(); ++i)
{
int idx = sharks.at(i)->get_pos().x / (int)(width / PARTITION_X)
+ (int)(sharks.at(i)->get_pos().y / (int)(height / PARTITION_Y))*PARTITION_X;
sharks.at(i)->set_pidx(idx);
sharks.at(i)->update(this);
}
}
World::World(): width(640), height(640)
{
partitons.resize(PARTITION_X*PARTITION_Y);
for(int i = 0; i < 400; ++i)
{
//位置はランダム、初期速度はゼロ
Fish* fish = new Fish(vec2d(100+(double)rand()/RAND_MAX*400,
100+(double)rand()/RAND_MAX*400),
vec2d());
fishes.push_back(fish);
//どこの領域にいるかを計算・更新
int idx = fish->get_pos().x / (int)(width / PARTITION_X)
+ (int)(fish->get_pos().y / (int)(height / PARTITION_Y))*PARTITION_X;
partitons.at(idx).insert(std::make_pair(fish->get_id(), fish));
fish->set_pidx(idx);
}
//三匹sharkを追加
sharks.push_back(new Shark(vec2d(100,100), vec2d(0,0)));
sharks.push_back(new Shark(vec2d(250,250), vec2d(0,0)));
sharks.push_back(new Shark(vec2d(450,450), vec2d(0,0)));
}