SegmentSet2 Class Reference

Set of line segments in the plane. More...

#include <segment.h>

Public Member Functions
	SegmentSet2 ()
	Empty.
	SegmentSet2 (const QVector< Vector2 > &, const QVector< int > &)
	Create a set of line segments from a list of vertices and a indexes.
QVector< Segment2 >	GetSegments () const
	Get the set of line segments.
Segment2	GetSegment (int) const
	Return the k-th segment.
Vector2	Vertex (int) const
	Return the k-th vertex.
bool	IsEmpty () const
	Check is the set of segments is empty.
int	SegmentSize () const
	Return the number of segments.
Polygons2	GetPolygons () const
	Get the subset of closed polygons.
void	Draw (QGraphicsScene &, const QPen &=QPen()) const
	Draw a set of line segments.

Protected Attributes
QVector< Vector2 >	vertices
	Vertices.
QVector< int >	indices
	Segment vertex indices.

Detailed Description

Set of line segments in the plane.

Segments are stored as set of vertexes, and an index array.

This structure is effective for generating the contours of a ScalarField2.

See also

ScalarField2::LineSegments

Constructor & Destructor Documentation

SegmentSet2()

SegmentSet2::SegmentSet2 ( const QVector< Vector2 > & v, const QVector< int > & i )

explicit

Create a set of line segments from a list of vertices and a indexes.

Indices should be a multiple of two; the number of segments is derived from the size of the array.

See also

Mesh2

Parameters

v	Set of vertices.
i	Indexes that represent the segments.

Member Function Documentation

Draw()

void SegmentSet2::Draw	(	QGraphicsScene &	scene,
		const QPen &	pen = QPen() ) const

Draw a set of line segments.

Parameters

scene	Graphics scene.
pen	The pen.

GetPolygons()

Polygons2 SegmentSet2::GetPolygons

(

)

const

Get the subset of closed polygons.

Detects all loops in the structure and create closed polygons, open polylines are not returned.

GetSegment()

Segment2 SegmentSet2::GetSegment ( int k ) const

inline

Return the k-th segment.

Parameters

k

Index.

Vertex()

Vector2 SegmentSet2::Vertex ( int k ) const

inline

Return the k-th vertex.

Parameters

k

Index.