In addition to the default and copy constructors the following static
methods are available for constructing sites:
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SegmentDelaunayGraphSite_2
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s.construct_site_2 ( Point_2 p)
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Constructs a site from a point: the site
represents the point p.
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SegmentDelaunayGraphSite_2
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s.construct_site_2 ( Point_2 p1, Point_2 p2)
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Constructs a site from two points: the site represents
the (open) segment (p1,p2).
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SegmentDelaunayGraphSite_2
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s.construct_site_2 ( Point_2 p1, Point_2 p2, Point_2 q1, Point_2 q2)
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Constructs a site from four points: the site represents the
point of intersection of the segments (p1,p2) and
(q1,q2).
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SegmentDelaunayGraphSite_2
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s.construct_site_2 ( Point_2 p1, Point_2 p2, Point_2 q1, Point_2 q2, bool b)
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Constructs a site from four points and a boolean: the
site represents a segment. If b is true the endpoints
are p1 and p × , otherwise p × and
p2. p × is the point of intersection of the segments
(p1,p2),(q1,q2).
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SegmentDelaunayGraphSite_2
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s.construct_site_2 ( Point_2 p1, Point_2 p2, Point_2 q1, Point_2 q2, Point_2 r1, Point_2 r2)
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Constructs a site from six
points: the site represents the segment with endpoints the points of
intersection of the pairs of segments (p1,p2),(q1,q2)
and (p1,p2),(r1,r2).
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bool
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s.is_defined ()
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Returns true if the site
represents a valid point or segment.
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bool
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s.is_point ()
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Returns true if the site represents
a point.
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bool
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s.is_segment ()
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Returns true if the site
represents a segment.
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bool
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s.is_input ()
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Returns true if the site
represents an input point or a segment defined by two input
points. Returns false if it represents a point of intersection
of two segments, or if it represents a segment, at least one
endpoint of which is a point of intersection of two segments.
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bool
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s.is_input ( unsigned int i)
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Returns true if the
i-th endpoint of the site is an input point. Returns false
if the i-th endpoint of the site is the intersection of two
segments.
| Precondition: | i must be at most 1, and s.is_segment()
must be true. |
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Point_2
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s.point () const
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Returns the point represented by the
site s.
| Precondition: | s.is_point() must be true. |
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Segment_2
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s.segment () const
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Returns the segment represented
by the site s.
| Precondition: | s.is_segment() must be true. |
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Point_2
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s.source () const
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Returns the source endpoint of the
segment. Note that this method can construct an inexact point if the
number type used is inexact.
| Precondition: | s.is_segment() must be true. |
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Point_2
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s.target () const
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Returns the target endpoint of the
segment. Note that this method can construct an inexact point if the
number type used is inexact.
| Precondition: | s.is_segment() must be true. |
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SegmentDelaunayGraphSite_2
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s.supporting_site ()
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Returns a segment site object representing the segment
that supports the segment represented by the site. Both
endpoints of the returned site are input points.
| Precondition: | s.is_segment() must be true. |
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SegmentDelaunayGraphSite_2
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s.supporting_site ( unsigned int i)
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Returns a segment site object representing the i-th
segment that supports the point of intersection represented
by the site. Both endpoints of the returned site are input
points.
| Precondition: | i must be at most 1, s.is_point() must be
true and s.is_input() must be false. |
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SegmentDelaunayGraphSite_2
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s.crossing_site ( unsigned int i)
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Returns a segment site object representing the i-th
segment that supports the i-th endpoint of the site
which is not the supporting segment of the site. Both
endpoints of the returned site are input points.
| Precondition: | i must be at most 1,
s.is_segment() must be true and
s.is_input(i) must be false. |
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SegmentDelaunayGraphSite_2
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s.source_site ()
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Returns a point site object representing the source point of
the site.
| Precondition: | s.is_segment() must be true. |
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SegmentDelaunayGraphSite_2
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s.target_site ()
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Returns a point site object representing the target point of
the site.
| Precondition: | s.is_segment() must be true. |
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Point_2
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s.source_of_supporting_site ()
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Returns the source point of the supporting site of the this site.
| Precondition: | is_segment() must be true. |
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Point_2
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s.target_of_supporting_site ()
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Returns the target point of the supporting site of the this site.
| Precondition: | is_segment() must be true. |
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Point_2
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s.source_of_supporting_site ( unsigned int i)
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Returns the source point of the i-th supporting site of the
this site.
| Precondition: | is_point() must be true, is_input()
must be false and i must either be 0 or 1. |
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Point_2
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s.target_of_supporting_site ( unsigned int i)
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Returns the target point of the i-th supporting site of the
this site.
| Precondition: | is_point() must be true, is_input()
must be false and i must either be 0 or 1. |
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Point_2
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s.source_of_crossing_site ( unsigned int i)
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Returns the source point of the i-th crossing site of the
this site.
| Precondition: | is_segment() must be true, is_input(i)
must be false and i must either be 0 or 1. |
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Point_2
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s.target_of_crossing_site ( unsigned int i)
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Returns the target point of the i-th supporting site of the
this site.
| Precondition: | is_segment() must be true, is_input(i)
must be false and i must either be 0 or 1. |
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