कैसे वापस करने के लिए पारस्परिक linestrings में बढ़ावा देने::ज्यामिति::चौराहे(ring1, ring2, vector_of_linestring)?

Question 1

मैं 2 के छल्ले के लिए एक और बी, और मैं का उपयोग करना चाहते हैं boost::geometry::intersection() वापस करने के लिए linestrings (नारंगी तीर हैं):

लेकिन मेरे कोड केवल रिटर्न अन्तर्विभाजक अंक P1 और P2. हिस्सा है जो मैं संशोधित?

#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/register/ring.hpp>
#include <boost/geometry/geometries/register/point.hpp>
#include <iostream>

namespace bg = boost::geometry;
typedef bg::model::point<double, 2, bg::cs::cartesian> point_t;
typedef bg::model::linestring<point_t> linestring_t;
typedef bg::model::ring<point_t> ring_t;
typedef bg::model::polygon<point_t> polygon_t;

typedef bg::model::multi_point<point_t> mpoint_t;
typedef bg::model::multi_linestring<linestring_t> mlinestring_t;
typedef bg::model::multi_polygon<polygon_t> mpolygon_t;

int main() {
    point_t ptA0(0, 0);
    point_t ptA1(10, 0);
    point_t ptA2(10, 10);
    point_t ptA3(0, 10);
    ring_t ringA;
    bg::append(ringA, ptA0);
    bg::append(ringA, ptA1);
    bg::append(ringA, ptA2);
    bg::append(ringA, ptA3);
    bg::append(ringA, ptA0);
    
    point_t ptB0(5, -5);
    point_t ptB1(15, -5);
    point_t ptB2(15, 5);
    point_t ptB3(5, 5);
    ring_t ringB;
    bg::append(ringB, ptB0);
    bg::append(ringB, ptB1);
    bg::append(ringB, ptB2);
    bg::append(ringB, ptB3);
    bg::append(ringB, ptB0);  

    std::vector<linestring_t> resline;      
    bg::intersection(ringB, ringA, resline);
    for (int i = 0; i < resline.size(); i++) {
        std::cout << bg::dsv(resline[i]) << std::endl;
    }   
    return 0;
}

नीचे का उत्पादन: (10, 5) P1 और (5, 0) है P2, जो नहीं है कि मैं क्या उम्मीद है.

((10, 5), (10, 5)) 
((5, 0), (5, 0))

Question 2

मैं करने की कोशिश की है पर एक संभाल पाने का उपयोग कर इस समस्या सिर्फ DE-9IM को बढ़ावा देने कि ज्यामिति को लागू करता है: https://godbolt.org/z/KWzvzExr7 जो outputs https://pastebin.ubuntu.com/p/9ck6gcPK5P/

---- void do_test(Input, Input) [with Input = boost::geometry::model::ring<boost::geometry::model::point<int, 2, boost::geometry::cs::cartesian> >]
a: POLYGON((0 0,0 10,10 10,10 0,0 0))
b: POLYGON((5 -5,5 5,15 5,15 -5,5 -5))
MULTIPOINT((10 5),(5 0))
MULTIPOLYGON(((10 5,10 0,5 0,5 5,10 5)))
Segment of ringB LINESTRING(5 -5,5 5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(5 5,15 5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(15 5,15 -5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(15 -5,5 -5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
 ---- void do_test(Input, Input) [with Input = boost::geometry::model::linestring<boost::geometry::model::point<int, 2, boost::geometry::cs::cartesian> >]
a: LINESTRING(0 0,0 10,10 10,10 0,0 0)
b: LINESTRING(5 -5,5 5,15 5,15 -5,5 -5)
MULTIPOINT((10 5),(5 0))
Segment of ringB LINESTRING(5 -5,5 5) relates to ringA 
['F', 'F', '1']
['F', 'F', 'F']
['F', 'F', '2']
Segment of ringB LINESTRING(5 5,15 5) relates to ringA 
['F', 'F', '1']
['F', 'F', 'F']
['F', 'F', '2']
Segment of ringB LINESTRING(15 5,15 -5) relates to ringA 
['F', 'F', '1']
['F', 'F', 'F']
['F', 'F', '2']
Segment of ringB LINESTRING(15 -5,5 -5) relates to ringA 
['F', 'F', '1']
['F', 'F', 'F']
['F', 'F', '2']
 ---- void do_test(Input, Input) [with Input = boost::geometry::model::polygon<boost::geometry::model::point<int, 2, boost::geometry::cs::cartesian> >]
a: POLYGON((0 0,0 10,10 10,10 0,0 0))
b: POLYGON((5 -5,5 5,15 5,15 -5,5 -5))
MULTIPOINT((10 5),(5 0))
MULTIPOLYGON(((10 5,10 0,5 0,5 5,10 5)))
Segment of ringB LINESTRING(5 -5,5 5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(5 5,15 5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(15 5,15 -5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(15 -5,5 -5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']

लेकिन के रूप में दूर के रूप में मैं सब देख सकते हैं परिणाम कर रहे हैं, कम से कम पूरी तरह से संबंध तोड़ना. तो तुम हो सकता है में ज़ूम करने के लिए पर अंक के बजाय खंडों:

पर रहते हैं Wandbox

#include <boost/geometry.hpp>
#include <boost/geometry/geometries/ring.hpp>
#include <boost/geometry/iterators/segment_iterator.hpp>
#include <iostream>

namespace bg = boost::geometry;
using point_t  = bg::model::point<int, 2, bg::cs::cartesian>;
using ring_t   = bg::model::ring<point_t>;
using mpoint_t = bg::model::multi_point<point_t>;

void do_test(ring_t ringA, ring_t ringB)
{
    std::string reason;
    if (!bg::is_valid(ringA, reason)) { std::cout << "warning ringA: " << reason << "\n"; bg::correct(ringA); }
    if (!bg::is_valid(ringB, reason)) { std::cout << "warning ringB: " << reason << "\n"; bg::correct(ringB); }

    std::cout << "ringA: " << bg::wkt(ringA) << std::endl;
    std::cout << "ringB: " << bg::wkt(ringB) << std::endl;

    mpoint_t result;
    bg::intersection(ringA, ringB, result);
    std::cout << bg::wkt(result) << std::endl;

    for (auto seg : boost::make_iterator_range(bg::segments_begin(ringB),
                                               bg::segments_end(ringB))) {
        for (auto& p : result)
            if (bg::intersects(p, seg))
                std::cout << bg::wkt(p) << " intersects " << bg::wkt(seg) << "\n";
    }
}

int main() {
    do_test({{0, 0}, {0, 10}, {10, 10}, {10, 0}/*, {0, 0}*/},
            {{5, -5}, {5, 5}, {15, 5}, {15, -5}/*, {5, -5}*/});
}

प्रिंट

warning ringA: Geometry is defined as closed but is open
warning ringB: Geometry is defined as closed but is open
ringA: POLYGON((0 0,0 10,10 10,10 0,0 0))
ringB: POLYGON((5 -5,5 5,15 5,15 -5,5 -5))
MULTIPOINT((10 5),(5 0))
POINT(5 0) intersects LINESTRING(5 -5,5 5)
POINT(10 5) intersects LINESTRING(5 5,15 5)

sehe · Answer 1 · 2021-11-24T20:34:20

मैं करने की कोशिश की है पर एक संभाल पाने का उपयोग कर इस समस्या सिर्फ DE-9IM को बढ़ावा देने कि ज्यामिति को लागू करता है: https://godbolt.org/z/KWzvzExr7 जो outputs https://pastebin.ubuntu.com/p/9ck6gcPK5P/

---- void do_test(Input, Input) [with Input = boost::geometry::model::ring<boost::geometry::model::point<int, 2, boost::geometry::cs::cartesian> >]
a: POLYGON((0 0,0 10,10 10,10 0,0 0))
b: POLYGON((5 -5,5 5,15 5,15 -5,5 -5))
MULTIPOINT((10 5),(5 0))
MULTIPOLYGON(((10 5,10 0,5 0,5 5,10 5)))
Segment of ringB LINESTRING(5 -5,5 5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(5 5,15 5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(15 5,15 -5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(15 -5,5 -5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
 ---- void do_test(Input, Input) [with Input = boost::geometry::model::linestring<boost::geometry::model::point<int, 2, boost::geometry::cs::cartesian> >]
a: LINESTRING(0 0,0 10,10 10,10 0,0 0)
b: LINESTRING(5 -5,5 5,15 5,15 -5,5 -5)
MULTIPOINT((10 5),(5 0))
Segment of ringB LINESTRING(5 -5,5 5) relates to ringA 
['F', 'F', '1']
['F', 'F', 'F']
['F', 'F', '2']
Segment of ringB LINESTRING(5 5,15 5) relates to ringA 
['F', 'F', '1']
['F', 'F', 'F']
['F', 'F', '2']
Segment of ringB LINESTRING(15 5,15 -5) relates to ringA 
['F', 'F', '1']
['F', 'F', 'F']
['F', 'F', '2']
Segment of ringB LINESTRING(15 -5,5 -5) relates to ringA 
['F', 'F', '1']
['F', 'F', 'F']
['F', 'F', '2']
 ---- void do_test(Input, Input) [with Input = boost::geometry::model::polygon<boost::geometry::model::point<int, 2, boost::geometry::cs::cartesian> >]
a: POLYGON((0 0,0 10,10 10,10 0,0 0))
b: POLYGON((5 -5,5 5,15 5,15 -5,5 -5))
MULTIPOINT((10 5),(5 0))
MULTIPOLYGON(((10 5,10 0,5 0,5 5,10 5)))
Segment of ringB LINESTRING(5 -5,5 5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(5 5,15 5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(15 5,15 -5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']
Segment of ringB LINESTRING(15 -5,5 -5) relates to ringA 
['F', 'F', '2']
['F', 'F', '1']
['F', 'F', '2']

लेकिन के रूप में दूर के रूप में मैं सब देख सकते हैं परिणाम कर रहे हैं, कम से कम पूरी तरह से संबंध तोड़ना. तो तुम हो सकता है में ज़ूम करने के लिए पर अंक के बजाय खंडों:

पर रहते हैं Wandbox

#include <boost/geometry.hpp>
#include <boost/geometry/geometries/ring.hpp>
#include <boost/geometry/iterators/segment_iterator.hpp>
#include <iostream>

namespace bg = boost::geometry;
using point_t  = bg::model::point<int, 2, bg::cs::cartesian>;
using ring_t   = bg::model::ring<point_t>;
using mpoint_t = bg::model::multi_point<point_t>;

void do_test(ring_t ringA, ring_t ringB)
{
    std::string reason;
    if (!bg::is_valid(ringA, reason)) { std::cout << "warning ringA: " << reason << "\n"; bg::correct(ringA); }
    if (!bg::is_valid(ringB, reason)) { std::cout << "warning ringB: " << reason << "\n"; bg::correct(ringB); }

    std::cout << "ringA: " << bg::wkt(ringA) << std::endl;
    std::cout << "ringB: " << bg::wkt(ringB) << std::endl;

    mpoint_t result;
    bg::intersection(ringA, ringB, result);
    std::cout << bg::wkt(result) << std::endl;

    for (auto seg : boost::make_iterator_range(bg::segments_begin(ringB),
                                               bg::segments_end(ringB))) {
        for (auto& p : result)
            if (bg::intersects(p, seg))
                std::cout << bg::wkt(p) << " intersects " << bg::wkt(seg) << "\n";
    }
}

int main() {
    do_test({{0, 0}, {0, 10}, {10, 10}, {10, 0}/*, {0, 0}*/},
            {{5, -5}, {5, 5}, {15, 5}, {15, -5}/*, {5, -5}*/});
}

प्रिंट

warning ringA: Geometry is defined as closed but is open
warning ringB: Geometry is defined as closed but is open
ringA: POLYGON((0 0,0 10,10 10,10 0,0 0))
ringB: POLYGON((5 -5,5 5,15 5,15 -5,5 -5))
MULTIPOINT((10 5),(5 0))
POINT(5 0) intersects LINESTRING(5 -5,5 5)
POINT(10 5) intersects LINESTRING(5 5,15 5)

कैसे वापस करने के लिए पारस्परिक linestrings में बढ़ावा देने::ज्यामिति::चौराहे(ring1, ring2, vector_of_linestring)?

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