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Incomplete work for using Boost.Polygon to compute medial axis
This commit is contained in:
Alessandro Ranellucci
parent
11f065ca5e
commit
bf91f3096a
1650 changed files with 307148 additions and 9 deletions
418
xs/src/boost/polygon/detail/polygon_90_touch.hpp
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418
xs/src/boost/polygon/detail/polygon_90_touch.hpp
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/*
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Copyright 2008 Intel Corporation
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Use, modification and distribution are subject to the Boost Software License,
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Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt).
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*/
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#ifndef BOOST_POLYGON_POLYGON_90_TOUCH_HPP
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#define BOOST_POLYGON_POLYGON_90_TOUCH_HPP
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namespace boost { namespace polygon{
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template <typename Unit>
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struct touch_90_operation {
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typedef interval_data<Unit> Interval;
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class TouchScanEvent {
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private:
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typedef std::map<Unit, std::set<int> > EventData;
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EventData eventData_;
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public:
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// The TouchScanEvent::iterator is a lazy algorithm that accumulates
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// polygon ids in a set as it is incremented through the
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// scan event data structure.
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// The iterator provides a forward iterator semantic only.
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class iterator {
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private:
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typename EventData::const_iterator itr_;
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std::pair<Interval, std::set<int> > ivlIds_;
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bool incremented_;
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public:
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inline iterator() : itr_(), ivlIds_(), incremented_(false) {}
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inline iterator(typename EventData::const_iterator itr,
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Unit prevPos, Unit curPos, const std::set<int>& ivlIds) : itr_(itr), ivlIds_(), incremented_(false) {
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ivlIds_.second = ivlIds;
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ivlIds_.first = Interval(prevPos, curPos);
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}
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inline iterator(const iterator& that) : itr_(), ivlIds_(), incremented_(false) { (*this) = that; }
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inline iterator& operator=(const iterator& that) {
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itr_ = that.itr_;
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ivlIds_.first = that.ivlIds_.first;
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ivlIds_.second = that.ivlIds_.second;
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incremented_ = that.incremented_;
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return *this;
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}
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inline bool operator==(const iterator& that) { return itr_ == that.itr_; }
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inline bool operator!=(const iterator& that) { return itr_ != that.itr_; }
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inline iterator& operator++() {
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//std::cout << "increment\n";
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//std::cout << "state\n";
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//for(std::set<int>::iterator itr = ivlIds_.second.begin(); itr != ivlIds_.second.end(); ++itr) {
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// std::cout << (*itr) << " ";
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//} std::cout << std::endl;
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//std::cout << "update\n";
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for(std::set<int>::const_iterator itr = (*itr_).second.begin();
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itr != (*itr_).second.end(); ++itr) {
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//std::cout << (*itr) << " ";
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std::set<int>::iterator lb = ivlIds_.second.find(*itr);
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if(lb != ivlIds_.second.end()) {
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ivlIds_.second.erase(lb);
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} else {
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ivlIds_.second.insert(*itr);
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}
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}
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//std::cout << std::endl;
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//std::cout << "new state\n";
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//for(std::set<int>::iterator itr = ivlIds_.second.begin(); itr != ivlIds_.second.end(); ++itr) {
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// std::cout << (*itr) << " ";
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//} std::cout << std::endl;
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++itr_;
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//ivlIds_.first = Interval(ivlIds_.first.get(HIGH), itr_->first);
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incremented_ = true;
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return *this;
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}
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inline const iterator operator++(int){
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iterator tmpItr(*this);
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++(*this);
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return tmpItr;
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}
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inline std::pair<Interval, std::set<int> >& operator*() {
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if(incremented_) ivlIds_.first = Interval(ivlIds_.first.get(HIGH), itr_->first);
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incremented_ = false;
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if(ivlIds_.second.empty())(++(*this));
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if(incremented_) ivlIds_.first = Interval(ivlIds_.first.get(HIGH), itr_->first);
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incremented_ = false;
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return ivlIds_; }
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};
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inline TouchScanEvent() : eventData_() {}
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template<class iT>
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inline TouchScanEvent(iT begin, iT end) : eventData_() {
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for( ; begin != end; ++begin){
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insert(*begin);
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}
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}
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inline TouchScanEvent(const TouchScanEvent& that) : eventData_(that.eventData_) {}
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inline TouchScanEvent& operator=(const TouchScanEvent& that){
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eventData_ = that.eventData_;
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return *this;
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}
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//Insert an interval polygon id into the EventData
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inline void insert(const std::pair<Interval, int>& intervalId){
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insert(intervalId.first.low(), intervalId.second);
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insert(intervalId.first.high(), intervalId.second);
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}
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//Insert an position and polygon id into EventData
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inline void insert(Unit pos, int id) {
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typename EventData::iterator lb = eventData_.lower_bound(pos);
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if(lb != eventData_.end() && lb->first == pos) {
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std::set<int>& mr (lb->second);
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std::set<int>::iterator mri = mr.find(id);
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if(mri == mr.end()) {
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mr.insert(id);
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} else {
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mr.erase(id);
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}
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} else {
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lb = eventData_.insert(lb, std::pair<Unit, std::set<int> >(pos, std::set<int>()));
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(*lb).second.insert(id);
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}
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}
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//merge this scan event with that by inserting its data
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inline void insert(const TouchScanEvent& that){
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typename EventData::const_iterator itr;
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for(itr = that.eventData_.begin(); itr != that.eventData_.end(); ++itr) {
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eventData_[(*itr).first].insert(itr->second.begin(), itr->second.end());
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}
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}
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//Get the begin iterator over event data
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inline iterator begin() const {
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//std::cout << "begin\n";
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if(eventData_.empty()) return end();
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typename EventData::const_iterator itr = eventData_.begin();
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Unit pos = itr->first;
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const std::set<int>& idr = itr->second;
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++itr;
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return iterator(itr, pos, itr->first, idr);
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}
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//Get the end iterator over event data
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inline iterator end() const { return iterator(eventData_.end(), 0, 0, std::set<int>()); }
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inline void clear() { eventData_.clear(); }
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inline Interval extents() const {
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if(eventData_.empty()) return Interval();
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return Interval((*(eventData_.begin())).first, (*(eventData_.rbegin())).first);
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}
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};
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//declaration of a map of scan events by coordinate value used to store all the
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//polygon data for a single layer input into the scanline algorithm
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typedef std::pair<std::map<Unit, TouchScanEvent>, std::map<Unit, TouchScanEvent> > TouchSetData;
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class TouchOp {
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public:
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typedef std::map<Unit, std::set<int> > ScanData;
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typedef std::pair<Unit, std::set<int> > ElementType;
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protected:
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ScanData scanData_;
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typename ScanData::iterator nextItr_;
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public:
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inline TouchOp () : scanData_(), nextItr_() { nextItr_ = scanData_.end(); }
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inline TouchOp (const TouchOp& that) : scanData_(that.scanData_), nextItr_() { nextItr_ = scanData_.begin(); }
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inline TouchOp& operator=(const TouchOp& that);
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//moves scanline forward
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inline void advanceScan() { nextItr_ = scanData_.begin(); }
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//proceses the given interval and std::set<int> data
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//the output data structre is a graph, the indicies in the vector correspond to graph nodes,
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//the integers in the set are vector indicies and are the nodes with which that node shares an edge
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template <typename graphT>
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inline void processInterval(graphT& outputContainer, Interval ivl, const std::set<int>& ids, bool leadingEdge) {
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//print();
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typename ScanData::iterator lowItr = lookup_(ivl.low());
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typename ScanData::iterator highItr = lookup_(ivl.high());
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//std::cout << "Interval: " << ivl << std::endl;
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//for(std::set<int>::const_iterator itr = ids.begin(); itr != ids.end(); ++itr)
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// std::cout << (*itr) << " ";
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//std::cout << std::endl;
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//add interval to scan data if it is past the end
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if(lowItr == scanData_.end()) {
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//std::cout << "case0" << std::endl;
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lowItr = insert_(ivl.low(), ids);
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evaluateBorder_(outputContainer, ids, ids);
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highItr = insert_(ivl.high(), std::set<int>());
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return;
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}
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//ensure that highItr points to the end of the ivl
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if(highItr == scanData_.end() || (*highItr).first > ivl.high()) {
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//std::cout << "case1" << std::endl;
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//std::cout << highItr->first << std::endl;
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std::set<int> value = std::set<int>();
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if(highItr != scanData_.begin()) {
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--highItr;
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//std::cout << highItr->first << std::endl;
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//std::cout << "high set size " << highItr->second.size() << std::endl;
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value = highItr->second;
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}
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nextItr_ = highItr;
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highItr = insert_(ivl.high(), value);
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} else {
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//evaluate border with next higher interval
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//std::cout << "case1a" << std::endl;
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if(leadingEdge)evaluateBorder_(outputContainer, highItr->second, ids);
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}
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//split the low interval if needed
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if(lowItr->first > ivl.low()) {
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//std::cout << "case2" << std::endl;
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if(lowItr != scanData_.begin()) {
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//std::cout << "case3" << std::endl;
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--lowItr;
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nextItr_ = lowItr;
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//std::cout << lowItr->first << " " << lowItr->second.size() << std::endl;
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lowItr = insert_(ivl.low(), lowItr->second);
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} else {
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//std::cout << "case4" << std::endl;
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nextItr_ = lowItr;
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lowItr = insert_(ivl.low(), std::set<int>());
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}
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} else {
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//evaluate border with next higher interval
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//std::cout << "case2a" << std::endl;
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typename ScanData::iterator nextLowerItr = lowItr;
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if(leadingEdge && nextLowerItr != scanData_.begin()){
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--nextLowerItr;
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evaluateBorder_(outputContainer, nextLowerItr->second, ids);
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}
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}
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//std::cout << "low: " << lowItr->first << " high: " << highItr->first << std::endl;
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//print();
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//process scan data intersecting interval
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for(typename ScanData::iterator itr = lowItr; itr != highItr; ){
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//std::cout << "case5" << std::endl;
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//std::cout << itr->first << std::endl;
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std::set<int>& beforeIds = itr->second;
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++itr;
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evaluateInterval_(outputContainer, beforeIds, ids, leadingEdge);
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}
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//print();
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//merge the bottom interval with the one below if they have the same count
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if(lowItr != scanData_.begin()){
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//std::cout << "case6" << std::endl;
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typename ScanData::iterator belowLowItr = lowItr;
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--belowLowItr;
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if(belowLowItr->second == lowItr->second) {
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//std::cout << "case7" << std::endl;
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scanData_.erase(lowItr);
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}
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}
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//merge the top interval with the one above if they have the same count
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if(highItr != scanData_.begin()) {
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//std::cout << "case8" << std::endl;
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typename ScanData::iterator beforeHighItr = highItr;
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--beforeHighItr;
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if(beforeHighItr->second == highItr->second) {
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//std::cout << "case9" << std::endl;
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scanData_.erase(highItr);
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highItr = beforeHighItr;
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++highItr;
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}
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}
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//print();
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nextItr_ = highItr;
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}
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// inline void print() const {
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// for(typename ScanData::const_iterator itr = scanData_.begin(); itr != scanData_.end(); ++itr) {
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// std::cout << itr->first << ": ";
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// for(std::set<int>::const_iterator sitr = itr->second.begin();
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// sitr != itr->second.end(); ++sitr){
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// std::cout << *sitr << " ";
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// }
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// std::cout << std::endl;
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// }
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// }
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private:
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inline typename ScanData::iterator lookup_(Unit pos){
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if(nextItr_ != scanData_.end() && nextItr_->first >= pos) {
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return nextItr_;
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}
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return nextItr_ = scanData_.lower_bound(pos);
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}
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inline typename ScanData::iterator insert_(Unit pos, const std::set<int>& ids){
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//std::cout << "inserting " << ids.size() << " ids at: " << pos << std::endl;
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return nextItr_ = scanData_.insert(nextItr_, std::pair<Unit, std::set<int> >(pos, ids));
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}
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template <typename graphT>
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inline void evaluateInterval_(graphT& outputContainer, std::set<int>& ids,
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const std::set<int>& changingIds, bool leadingEdge) {
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for(std::set<int>::const_iterator ciditr = changingIds.begin(); ciditr != changingIds.end(); ++ciditr){
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//std::cout << "evaluateInterval " << (*ciditr) << std::endl;
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evaluateId_(outputContainer, ids, *ciditr, leadingEdge);
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}
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}
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template <typename graphT>
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inline void evaluateBorder_(graphT& outputContainer, const std::set<int>& ids, const std::set<int>& changingIds) {
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for(std::set<int>::const_iterator ciditr = changingIds.begin(); ciditr != changingIds.end(); ++ciditr){
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//std::cout << "evaluateBorder " << (*ciditr) << std::endl;
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evaluateBorderId_(outputContainer, ids, *ciditr);
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}
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}
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template <typename graphT>
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inline void evaluateBorderId_(graphT& outputContainer, const std::set<int>& ids, int changingId) {
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for(std::set<int>::const_iterator scanItr = ids.begin(); scanItr != ids.end(); ++scanItr) {
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//std::cout << "create edge: " << changingId << " " << *scanItr << std::endl;
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if(changingId != *scanItr){
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outputContainer[changingId].insert(*scanItr);
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outputContainer[*scanItr].insert(changingId);
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}
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}
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}
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template <typename graphT>
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inline void evaluateId_(graphT& outputContainer, std::set<int>& ids, int changingId, bool leadingEdge) {
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//std::cout << "changingId: " << changingId << std::endl;
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//for( std::set<int>::iterator itr = ids.begin(); itr != ids.end(); ++itr){
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// std::cout << *itr << " ";
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//}std::cout << std::endl;
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std::set<int>::iterator lb = ids.lower_bound(changingId);
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if(lb == ids.end() || (*lb) != changingId) {
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if(leadingEdge) {
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//std::cout << "insert\n";
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//insert and add to output
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for(std::set<int>::iterator scanItr = ids.begin(); scanItr != ids.end(); ++scanItr) {
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//std::cout << "create edge: " << changingId << " " << *scanItr << std::endl;
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if(changingId != *scanItr){
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outputContainer[changingId].insert(*scanItr);
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outputContainer[*scanItr].insert(changingId);
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}
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}
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ids.insert(changingId);
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}
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} else {
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if(!leadingEdge){
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//std::cout << "erase\n";
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ids.erase(lb);
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}
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}
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}
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};
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template <typename graphT>
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static inline void processEvent(graphT& outputContainer, TouchOp& op, const TouchScanEvent& data, bool leadingEdge) {
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for(typename TouchScanEvent::iterator itr = data.begin(); itr != data.end(); ++itr) {
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//std::cout << "processInterval" << std::endl;
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op.processInterval(outputContainer, (*itr).first, (*itr).second, leadingEdge);
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}
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}
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template <typename graphT>
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static inline void performTouch(graphT& outputContainer, const TouchSetData& data) {
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typename std::map<Unit, TouchScanEvent>::const_iterator leftItr = data.first.begin();
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typename std::map<Unit, TouchScanEvent>::const_iterator rightItr = data.second.begin();
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typename std::map<Unit, TouchScanEvent>::const_iterator leftEnd = data.first.end();
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typename std::map<Unit, TouchScanEvent>::const_iterator rightEnd = data.second.end();
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TouchOp op;
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while(leftItr != leftEnd || rightItr != rightEnd) {
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//std::cout << "loop" << std::endl;
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op.advanceScan();
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//rightItr cannont be at end if leftItr is not at end
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if(leftItr != leftEnd && rightItr != rightEnd &&
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leftItr->first <= rightItr->first) {
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//std::cout << "case1" << std::endl;
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//std::cout << leftItr ->first << std::endl;
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processEvent(outputContainer, op, leftItr->second, true);
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++leftItr;
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} else {
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//std::cout << "case2" << std::endl;
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//std::cout << rightItr ->first << std::endl;
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processEvent(outputContainer, op, rightItr->second, false);
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++rightItr;
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}
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}
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}
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template <class iT>
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static inline void populateTouchSetData(TouchSetData& data, iT beginData, iT endData, int id) {
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Unit prevPos = ((std::numeric_limits<Unit>::max)());
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Unit prevY = prevPos;
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int count = 0;
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for(iT itr = beginData; itr != endData; ++itr) {
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Unit pos = (*itr).first;
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if(pos != prevPos) {
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prevPos = pos;
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prevY = (*itr).second.first;
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count = (*itr).second.second;
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continue;
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}
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Unit y = (*itr).second.first;
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if(count != 0 && y != prevY) {
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std::pair<Interval, int> element(Interval(prevY, y), id);
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if(count > 0) {
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data.first[pos].insert(element);
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} else {
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data.second[pos].insert(element);
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}
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}
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prevY = y;
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count += (*itr).second.second;
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}
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}
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static inline void populateTouchSetData(TouchSetData& data, const std::vector<std::pair<Unit, std::pair<Unit, int> > >& inputData, int id) {
|
||||
populateTouchSetData(data, inputData.begin(), inputData.end(), id);
|
||||
}
|
||||
|
||||
};
|
||||
}
|
||||
}
|
||||
#endif
|
||||
Loading…
Add table
Add a link
Reference in a new issue