160 lines
4.7 KiB
C++
160 lines
4.7 KiB
C++
/*
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Copyright 2012 Lucanus Simonson
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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_SEGMENT_UTILS_HPP
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#define BOOST_POLYGON_SEGMENT_UTILS_HPP
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#include <set>
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#include <vector>
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#include <utility>
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namespace boost {
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namespace polygon {
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template <typename Segment, typename SegmentIterator>
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typename enable_if<
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typename gtl_and<
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typename gtl_if<
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typename is_segment_concept<
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typename geometry_concept<
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typename std::iterator_traits<SegmentIterator>::value_type
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>::type
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>::type
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>::type,
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typename gtl_if<
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typename is_segment_concept<
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typename geometry_concept<Segment>::type
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>::type
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>::type
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>::type,
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void
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>::type
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intersect_segments(
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std::vector<std::pair<std::size_t, Segment> >& result,
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SegmentIterator first, SegmentIterator last) {
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typedef typename segment_traits<Segment>::coordinate_type Unit;
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typedef typename scanline_base<Unit>::Point Point;
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typedef typename scanline_base<Unit>::half_edge half_edge;
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typedef int segment_id;
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std::vector<std::pair<half_edge, segment_id> > half_edges;
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std::vector<std::pair<half_edge, segment_id> > half_edges_out;
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segment_id id_in = 0;
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half_edges.reserve(std::distance(first, last));
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for (; first != last; ++first) {
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Point l, h;
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assign(l, low(*first));
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assign(h, high(*first));
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half_edges.push_back(std::make_pair(half_edge(l, h), id_in++));
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}
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half_edges_out.reserve(half_edges.size());
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// Apparently no need to pre-sort data when calling validate_scan.
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if (half_edges.size() != 0) {
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line_intersection<Unit>::validate_scan(
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half_edges_out, half_edges.begin(), half_edges.end());
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}
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result.reserve(result.size() + half_edges_out.size());
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for (std::size_t i = 0; i < half_edges_out.size(); ++i) {
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std::size_t id = (std::size_t)(half_edges_out[i].second);
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Point l = half_edges_out[i].first.first;
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Point h = half_edges_out[i].first.second;
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result.push_back(std::make_pair(id, construct<Segment>(l, h)));
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}
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}
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template <typename SegmentContainer, typename SegmentIterator>
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typename enable_if<
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typename gtl_and<
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typename gtl_if<
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typename is_segment_concept<
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typename geometry_concept<
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typename std::iterator_traits<SegmentIterator>::value_type
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>::type
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>::type
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>::type,
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typename gtl_if<
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typename is_segment_concept<
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typename geometry_concept<
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typename SegmentContainer::value_type
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>::type
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>::type
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>::type
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>::type,
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void
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>::type
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intersect_segments(
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SegmentContainer& result,
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SegmentIterator first,
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SegmentIterator last) {
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typedef typename SegmentContainer::value_type segment_type;
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typedef typename segment_traits<segment_type>::coordinate_type Unit;
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typedef typename scanline_base<Unit>::Point Point;
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typedef typename scanline_base<Unit>::half_edge half_edge;
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typedef int segment_id;
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std::vector<std::pair<half_edge, segment_id> > half_edges;
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std::vector<std::pair<half_edge, segment_id> > half_edges_out;
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segment_id id_in = 0;
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half_edges.reserve(std::distance(first, last));
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for (; first != last; ++first) {
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Point l, h;
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assign(l, low(*first));
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assign(h, high(*first));
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half_edges.push_back(std::make_pair(half_edge(l, h), id_in++));
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}
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half_edges_out.reserve(half_edges.size());
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// Apparently no need to pre-sort data when calling validate_scan.
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if (half_edges.size() != 0) {
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line_intersection<Unit>::validate_scan(
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half_edges_out, half_edges.begin(), half_edges.end());
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}
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result.reserve(result.size() + half_edges_out.size());
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for (std::size_t i = 0; i < half_edges_out.size(); ++i) {
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Point l = half_edges_out[i].first.first;
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Point h = half_edges_out[i].first.second;
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result.push_back(construct<segment_type>(l, h));
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}
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}
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template <typename Rectangle, typename SegmentIterator>
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typename enable_if<
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typename gtl_and<
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typename gtl_if<
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typename is_rectangle_concept<
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typename geometry_concept<Rectangle>::type
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>::type
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>::type,
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typename gtl_if<
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typename is_segment_concept<
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typename geometry_concept<
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typename std::iterator_traits<SegmentIterator>::value_type
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>::type
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>::type
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>::type
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>::type,
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bool
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>::type
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envelope_segments(
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Rectangle& rect,
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SegmentIterator first,
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SegmentIterator last) {
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for (SegmentIterator it = first; it != last; ++it) {
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if (it == first) {
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set_points(rect, low(*it), high(*it));
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} else {
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encompass(rect, low(*it));
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encompass(rect, high(*it));
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}
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}
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return first != last;
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}
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} // polygon
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} // boost
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#endif // BOOST_POLYGON_SEGMENT_UTILS_HPP
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