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. More...
QVector< Segment2 >	GetSegments () const
	Get the set of line segments.
Segment2	GetSegment (int) const
	Return the k-th segment. More...
Vector2	Vertex (int) const
	Return the k-th vertex. More...
bool	IsEmpty () const
	Check is the set of segments is empty.
int	SegmentSize () const
	Return the number of segments.
QVector< Polygon2 >	GetPolygons () const
	Get the subset of closed polygons. More...
void	Draw (QGraphicsScene &, const QPen &=QPen()) const
	Draw a set of line segments. More...

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.

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()

QVector< Polygon2 > SegmentSet2::GetPolygons

(

)

const

Get the subset of closed polygons.

Detects all loops in the structure, open polylines are not returned in the set of polygons.

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.