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Optimize path finding upto 100x performance again

This commit is contained in:
Eduardo Bart 2014-02-16 13:57:53 -03:00
parent c96b717273
commit bb514d3acb
1 changed files with 11 additions and 9 deletions
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20
src/client/map.cpp
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@ -663,6 +663,12 @@ std::tuple<std::vector<Otc::Direction>, Otc::PathFindResult> Map::findPath(const
Otc::Direction dir;
};
struct LessNode : std::binary_function<std::pair<Node*, float>, std::pair<Node*, float>, bool> {
bool operator()(std::pair<Node*, float> a, std::pair<Node*, float> b) const {
return b.second < a.second;
}
};
std::tuple<std::vector<Otc::Direction>, Otc::PathFindResult> ret;
std::vector<Otc::Direction>& dirs = std::get<0>(ret);
Otc::PathFindResult& result = std::get<1>(ret);
@ -694,7 +700,7 @@ std::tuple<std::vector<Otc::Direction>, Otc::PathFindResult> Map::findPath(const
}
std::unordered_map<Position, Node*, PositionHasher> nodes;
std::deque<Node*> searchList;
std::priority_queue<std::pair<Node*, float>, std::vector<std::pair<Node*, float>>, LessNode> searchList;
Node *currentNode = new Node(startPos);
currentNode->pos = startPos;
@ -779,7 +785,7 @@ std::tuple<std::vector<Otc::Direction>, Otc::PathFindResult> Map::findPath(const
nodes[neighborPos] = neighborNode;
} else {
neighborNode = nodes[neighborPos];
if(neighborNode->cost < cost)
if(neighborNode->cost <= cost)
continue;
}
@ -787,17 +793,13 @@ std::tuple<std::vector<Otc::Direction>, Otc::PathFindResult> Map::findPath(const
neighborNode->cost = cost;
neighborNode->totalCost = neighborNode->cost + neighborPos.distance(goalPos);
neighborNode->dir = walkDir;
searchList.push_back(neighborNode);
searchList.push(std::make_pair(neighborNode, neighborNode->totalCost));
}
}
std::sort(searchList.begin(), searchList.end(), [](Node *a, Node *b) { return a->totalCost < b->totalCost; });
auto uniq_end = std::unique(searchList.begin(), searchList.end());
searchList.erase(uniq_end, searchList.end());
if(!searchList.empty()) {
currentNode = searchList.front();
searchList.pop_front();
currentNode = searchList.top().first;
searchList.pop();
} else
currentNode = nullptr;
}