(C++) BoostGeometryExample12

 

 

Boost.Geometry example 12: Create a linestring from WKT is a Boost.Geometry example.

Technical facts

 

Application type(s)

• Desktop application

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• GUI application

C++ standard:

• C++11

Compiler(s):

• G++ 4.9.2

Libraries used:

• Qt: version 5.4.1 (32 bit)
• STL: GNU ISO C++ Library, version 4.9.2

 

 

 

 

 

Qt project file: ./CppBoostGeometryExample12/CppBoostGeometryExample12.pro

 

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exists(../../ConsoleApplication.pri) {   include(../../ConsoleApplication.pri) } !exists(../../ConsoleApplication.pri) {   QT += core   QT += gui   greaterThan(QT_MAJOR_VERSION, 4): QT += widgets   CONFIG   += console   CONFIG   -= app_bundle   TEMPLATE = app   CONFIG(release, debug|release) {     DEFINES += NDEBUG NTRACE_BILDERBIKKEL   }   QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++   unix {     QMAKE_CXXFLAGS += -Werror   } } exists(../../Libraries/Boost.pri) {   include(../../Libraries/Boost.pri) } !exists(../../Libraries/Boost.pri) {   win32 {     INCLUDEPATH += \       ../../Libraries/boost_1_55_0   } } SOURCES += main.cpp

 

 

 

 

 

./CppBoostGeometryExample12/main.cpp

 

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#include <cassert> #include <iostream> #include <vector> #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Weffc++" #pragma GCC diagnostic ignored "-Wunused-local-typedefs" #pragma GCC diagnostic ignored "-Wunused-variable" #include <boost/geometry/algorithms/intersection.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/polygon.hpp> #include <boost/geometry/geometries/linestring.hpp> #include <boost/geometry/io/wkt/read.hpp> #include <boost/geometry/io/wkt/write.hpp> #include <boost/geometry/io/wkt/wkt.hpp> #pragma GCC diagnostic pop // 5 + //   | // 4 +   *---* //   |   |   | // 3 + *-+-* | //   | | | | | // 2 + | * | * //   | |   | // 1 + *   * //   | // 0 +-+-+-+-+-+ //   0 1 2 3 4 5 int main() {   typedef boost::geometry::model::d2::point_xy<double> Point;   typedef boost::geometry::model::linestring<Point> Linestring;   typedef std::vector<Point> Points;   Linestring linestring_a;   boost::geometry::read_wkt(     "LINESTRING(1.0 1.0, 1.0 3.0, 3.0 3.0, 3.0 1.0)",     linestring_a   );   Linestring linestring_b;   boost::geometry::read_wkt(     "LINESTRING(2.0 2.0, 2.0 4.0, 4.0 4.0, 4.0 2.0)",     linestring_b   );   assert(boost::geometry::intersects(linestring_a,linestring_b));   Points results_found;   boost::geometry::intersection(linestring_a,linestring_b,results_found);   assert(results_found.size() == 1);   std::cout     << "Found:" << '\n'     << "#points: " << results_found.size() << '\n'   ;   for (const auto result: results_found)   {     std::cout << boost::geometry::wkt<Point>(result) << '\n';   } } /* Screen output: Found: #points: 1 POINT(2 3) Press <RETURN> to close this window... */