CGAL 5.1.2 - 2D Arrangements
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#include <CGAL/Arr_curve_data_traits_2.h>
Tr.
The class Arr_curve_data_traits_2
is a model of the ArrangementTraits_2
concept and serves as a decorator class that allows the extension of the curves defined by the base traits-class (the Tr
parameter), which serves as a geometric traits-class (a model of the ArrangementTraits_2
concept), with extraneous (non-geometric) data fields.
The traits class inherits its point type from Traits::Point_2
, and defines an extended Curve_2
and X_monotone_curve_2
types, as detailed below.
Each Curve_2
object is associated with a single data field of type CData
, and each X_monotone_curve_2
object is associated with a single data field of type XData
. When a curve is subdivided into \( x\)-monotone subcurves, its data field is converted using the conversion functor, which is specified by the Cnv
template-parameter, and the resulting objects is copied to all X_monotone_curve_2
objects induced by this curve. The conversion functor should provide an operator with the following prototype:
XData operator() (const CData& d) const;
By default, the two data types are the same, so the conversion operator is trivial:
CData = | XData |
Cnv = | _Default_convert_functor<CData,XData> |
In case two (or more) \( x\)-monotone curves overlap, their data fields are merged to a single field, using the merge functor functor, which is specified by the Mrg
template-parameter. This functor should provide an operator with the following prototype:
XData operator() (const XData& d1, const XData& d2) const;
which returns a single data object that represents the merged data field of d1
and d2
. The \( x\)-monotone curve that represents the overlap is associated with the output of this functor.
Classes | |
class | Curve_2 |
The Curve_2 class nested within the curve-data traits extends the Base_traits_2::Curve_2 type with an extra data field of type Data . More... | |
class | X_monotone_curve_2 |
The X_monotone_curve_2 class nested within the curve-data traits extends the Base_traits_2::X_monotone_curve_2 type with an extra data field. More... | |
Types | |
typedef Tr | Base_traits_2 |
the base traits-class. | |
typedef Base_traits_2::Curve_2 | Base_curve_2 |
the base curve. | |
typedef Base_traits_2::X_monotone_curve_2 | Base_x_monotone_curve_2 |
the base \( x\)-monotone curve curve. | |
typedef Mrg | Merge |
the merge functor. | |
typedef Cnv | Convert |
the conversion functor. | |
typedef CData | Curve_data |
the type of data associated with curves. | |
typedef XData | X_monotone_curve_data |
the type of data associated with \( x\)-monotone curves. | |