phynexis-deps/cgal
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge pull request #5667 from afabri/Kernel-compare_slopes-GF

Browse Source 
Kernel: Add compare_slope with 4 points
This commit is contained in:
Sebastien Loriot
2021-08-12 10:12:26 +02:00
committed by GitHub
parent 8d00945943 2c1ad28853
commit 92d90a4a11
7 changed files with 85 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Homogeneous_kernel/include/CGAL/Homogeneous/function_objects.h
+30 -22
View File
@@ -810,6 +810,7 @@ namespace HomogeneousKernelFunctors {
template <typename K>
class Compare_slope_2
{
typedef typename K::Point_2 Point_2;
typedef typename K::Line_2 Line_2;
typedef typename K::Segment_2 Segment_2;
public:
@@ -842,48 +843,55 @@ namespace HomogeneousKernelFunctors {
result_type
operator()(const Segment_2& s1, const Segment_2& s2) const
{
return (*this)(s1.source(), s1.target(),
s2.source(), s2.target());
}
result_type
operator()(const Point_2& s1s, const Point_2& s1t, const Point_2& s2s, const Point_2& s2t) const
{
typedef typename K::FT FT;
typename K::Comparison_result cmp_y1 = compare_y(s1.source(), s1.target());
typename K::Comparison_result cmp_y1 = compare_y(s1s, s1t);
if (cmp_y1 == EQUAL) // horizontal
{
typename K::Comparison_result cmp_x2 = compare_x(s2.source(), s2.target());
typename K::Comparison_result cmp_x2 = compare_x(s2s, s2t);
if (cmp_x2 == EQUAL) return SMALLER;
FT s_hw = s2.source().hw();
FT t_hw = s2.target().hw();
return - CGAL_NTS sign(s2.source().hy()*t_hw - s2.target().hy()*s_hw) *
CGAL_NTS sign(s2.source().hx()*t_hw - s2.target().hx()*s_hw);
FT s_hw = s2s.hw();
FT t_hw = s2t.hw();
return - CGAL_NTS sign(s2s.hy()*t_hw - s2t.hy()*s_hw) *
CGAL_NTS sign(s2s.hx()*t_hw - s2t.hx()*s_hw);
}
typename K::Comparison_result cmp_y2 = compare_y(s2.source(), s2.target());
typename K::Comparison_result cmp_y2 = compare_y(s2s, s2t);
if (cmp_y2 == EQUAL)
{
typename K::Comparison_result cmp_x1 = compare_x(s1.source(), s1.target());
typename K::Comparison_result cmp_x1 = compare_x(s1s, s1t);
if (cmp_x1 == EQUAL) return LARGER;
FT s_hw = s1.source().hw();
FT t_hw = s1.target().hw();
return CGAL_NTS sign(s1.source().hy()*t_hw - s1.target().hy()*s_hw) *
CGAL_NTS sign(s1.source().hx()*t_hw - s1.target().hx()*s_hw);
FT s_hw = s1s.hw();
FT t_hw = s1t.hw();
return CGAL_NTS sign(s1s.hy()*t_hw - s1t.hy()*s_hw) *
CGAL_NTS sign(s1s.hx()*t_hw - s1t.hx()*s_hw);
}
typename K::Comparison_result cmp_x1 = compare_x(s1.source(), s1.target());
typename K::Comparison_result cmp_x2 = compare_x(s2.source(), s2.target());
typename K::Comparison_result cmp_x1 = compare_x(s1s, s1t);
typename K::Comparison_result cmp_x2 = compare_x(s2s, s2t);
if (cmp_x1 == EQUAL)
return cmp_x2 == EQUAL ? EQUAL : LARGER;
if (cmp_x2 == EQUAL) return SMALLER;
FT s1_s_hw = s1.source().hw();
FT s1_t_hw = s1.target().hw();
FT s2_s_hw = s2.source().hw();
FT s2_t_hw = s2.target().hw();
FT s1_xdiff = s1.source().hx()*s1_t_hw - s1.target().hx()*s1_s_hw;
FT s1_ydiff = s1.source().hy()*s1_t_hw - s1.target().hy()*s1_s_hw;
FT s2_xdiff = s2.source().hx()*s2_t_hw - s2.target().hx()*s2_s_hw;
FT s2_ydiff = s2.source().hy()*s2_t_hw - s2.target().hy()*s2_s_hw;
FT s1_s_hw = s1s.hw();
FT s1_t_hw = s1t.hw();
FT s2_s_hw = s2s.hw();
FT s2_t_hw = s2t.hw();
FT s1_xdiff = s1s.hx()*s1_t_hw - s1t.hx()*s1_s_hw;
FT s1_ydiff = s1s.hy()*s1_t_hw - s1t.hy()*s1_s_hw;
FT s2_xdiff = s2s.hx()*s2_t_hw - s2t.hx()*s2_s_hw;
FT s2_ydiff = s2s.hy()*s2_t_hw - s2t.hy()*s2_s_hw;
typename K::Sign s1_sign = CGAL_NTS sign(s1_ydiff * s1_xdiff);
typename K::Sign s2_sign = CGAL_NTS sign(s2_ydiff * s2_xdiff);