boost_mirror/geometry
1
0
Fork 0
mirror of https://github.com/boostorg/geometry.git synced 2025-05-09 15:14:02 +00:00
Code Issues Packages Projects Releases Wiki Activity

[geometry] fixed c04_b example to updated dispatch structure of area

Browse Source 
[SVN r85292]
This commit is contained in:
Barend Gehrels 2013-08-10 21:44:06 +00:00
parent 269b55c2e6
commit e18cfdbbf3
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
example/c04_b_custom_triangle_example.cpp
View File

@ -38,10 +38,11 @@ BOOST_GEOMETRY_REGISTER_RING_TEMPLATED(triangle)
namespace boost { namespace geometry { namespace dispatch {
// Specializations of area dispatch structure, implement algorithm
template<typename P, typename S>
struct area<ring_tag, triangle<P>, S>
template<typename Point>
struct area<triangle<Point>, ring_tag>
{
static inline double apply(triangle<P> const& t, S const&)
template <typename Strategy>
static inline double apply(triangle<Point> const& t, Strategy const&)
{
return 0.5 * ((get<0>(t[1]) - get<0>(t[0])) * (get<1>(t[2]) - get<1>(t[0]))
- (get<0>(t[2]) - get<0>(t[0])) * (get<1>(t[1]) - get<1>(t[0])));