(C++) BoostGeometryExample5

 

 

Boost.Geometry example 5: Get a box its left, right, width, height and area 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: ./CppBoostGeometryExample5/CppBoostGeometryExample5.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

 

 

 

 

 

./CppBoostGeometryExample5/main.cpp

 

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#include <cassert> #include <iostream> #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.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/box.hpp> #include <boost/units/quantity.hpp> #include <boost/units/systems/si.hpp> #pragma GCC diagnostic pop template <class T> boost::geometry::model::linestring<boost::geometry::model::d2::point_xy<T>> CreateLine(const std::vector<boost::geometry::model::d2::point_xy<T> >& v) {   return boost::geometry::model::linestring<     boost::geometry::model::d2::point_xy<T>   >(v.begin(),v.end()); } template <class T> boost::geometry::model::box<boost::geometry::model::d2::point_xy<T>>   CreateRect(     const T& left,     const T& top,     const T& right,     const T& bottom   ) {   typedef boost::geometry::model::d2::point_xy<T> Point;   boost::geometry::model::box<Point> rect(     Point( left, top   ),     Point(right, bottom)   );   return rect; } template <class T> T GetLeft(const boost::geometry::model::box<boost::geometry::model::d2::point_xy<T>>& r) noexcept {   using boost::geometry::get;   using boost::geometry::min_corner;   using boost::geometry::max_corner;   const auto left (get<min_corner,0>(r));   #ifndef NDEBUG   const auto right(get<max_corner,0>(r));   assert(left <= right);   #endif   return left; } template <class T> T GetTop(const boost::geometry::model::box<boost::geometry::model::d2::point_xy<T>>& r) noexcept {   using boost::geometry::get;   using boost::geometry::min_corner;   using boost::geometry::max_corner;   const auto top   (get<min_corner,1>(r));   #ifndef NDEBUG   const auto bottom(get<max_corner,1>(r));   assert(top <= bottom);   #endif   return top; } template <class T> T GetRight(const boost::geometry::model::box<boost::geometry::model::d2::point_xy<T>>& r) noexcept {   using boost::geometry::get;   using boost::geometry::min_corner;   using boost::geometry::max_corner;   const auto right(get<max_corner,0>(r));   #ifndef NDEBUG   const auto left (get<min_corner,0>(r));   assert(left <= right);   #endif   return right; } template <class T> T GetBottom(const boost::geometry::model::box<boost::geometry::model::d2::point_xy<T>>& r) noexcept {   using boost::geometry::get;   using boost::geometry::min_corner;   using boost::geometry::max_corner;   const auto bottom(get<max_corner,1>(r));   #ifndef NDEBUG   const auto top   (get<min_corner,1>(r));   assert(top <= bottom);   #endif   return bottom; } template <class T> T GetHeight(const boost::geometry::model::box<boost::geometry::model::d2::point_xy<T>>& r) noexcept {   using boost::geometry::get;   using boost::geometry::min_corner;   using boost::geometry::max_corner;   const auto top   (get<min_corner,1>(r));   const auto bottom(get<max_corner,1>(r));   assert(top <= bottom);   return bottom - top; } template <class T> T GetWidth(const boost::geometry::model::box<boost::geometry::model::d2::point_xy<T>>& r) noexcept {   using boost::geometry::get;   using boost::geometry::min_corner;   using boost::geometry::max_corner;   const auto left (get<min_corner,0>(r));   const auto right(get<max_corner,0>(r));   assert(left <= right);   return right - left; } template <class T> auto GetArea(const boost::geometry::model::box<boost::geometry::model::d2::point_xy<T>>& r) noexcept   -> decltype(T{} * T{}) {   return boost::geometry::area(r); } int main() {   {     typedef boost::geometry::model::d2::point_xy<int> Coordinat2D;     typedef boost::geometry::model::box<Coordinat2D> Rect;     const Rect r(CreateRect(1,2,3,5));     assert(GetLeft(r) == 1);     assert(GetTop(r) == 2);     assert(GetRight(r) == 3);     assert(GetBottom(r) == 5);     assert(GetWidth(r) == 2);     assert(GetHeight(r) == 3);     assert(GetArea(r) == 6);   }   #ifdef KNOW_HOW_TO_GET_THIS_TO_WORK   {     using boost::units::si::meter;     typedef boost::units::quantity<boost::units::si::length> Length;     typedef boost::geometry::model::d2::point_xy<Length> Coordinat2D;     typedef boost::geometry::model::box<Coordinat2D> Rect;     const Rect r(       CreateRect(         1.0 * meter,         2.0 * meter,         3.0 * meter,         5.0 * meter       )     );     assert(GetWidth(r) == 2.0 * meter);     assert(GetHeight(r) == 3.0 * meter);     assert(GetArea(r) == 6.0 * meter * meter);   }   #endif }