Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Calculates the centroid of a geometry.
The free function centroid calculates the geometric center (or: center of mass) of a geometry. This version with the return_ prefix returns the centroid, and a template parameter must therefore be specified in the call..
template<typename Point, typename Geometry> Point return_centroid(Geometry const & geometry)
|
Type |
Concept |
Name |
Description |
|---|---|---|---|
|
Point |
Any type fulfilling a Point Concept |
- |
Must be specified |
|
Geometry const & |
Any type fulfilling a Geometry Concept |
geometry |
A model of the specified concept |
The calculated centroid
Either
#include <boost/geometry.hpp>
Or
#include <boost/geometry/algorithms/centroid.hpp>
The function centroid implements function Centroid from the OGC Simple Feature Specification.
|
Case |
Behavior |
|---|---|
|
Point |
Returns the point itself as the centroid |
|
Multi Point |
Calculates centroid (based on average) |
|
linear (e.g. linestring) |
Calculates centroid (based on weighted length) |
|
areal (e.g. polygon) |
Calculates centroid |
|
Empty (e.g. polygon without points) |
Throws a centroid_exception |
|
Cartesian |
Implemented |
|
Spherical |
Calculates the centroid as if based on Cartesian coordinates |
|
2D |
3D |
|
|---|---|---|
|
Point |
|
|
|
Segment |
|
|
|
Box |
|
|
|
Linestring |
|
|
|
Ring |
|
|
|
Polygon |
|
|
|
MultiPoint |
|
|
|
MultiLinestring |
|
|
|
MultiPolygon |
|
|
Linear
