hed::Dart Class Reference

Dart class for the half-edge data structure. More...

#include <ttl/halfedge/HeDart.h>

List of all members.

Public Member Functions
	Dart ()
	Default constructor.
	Dart (Edge *edge, bool dir=true)
	Constructor.
	Dart (const Dart &dart)
	Copy constructor.
	~Dart ()
	Destructor.
Dart &	operator= (const Dart &dart)
	Assignment operator.
bool	operator== (const Dart &dart) const
	Comparing dart objects.
bool	operator!= (const Dart &dart) const
	Comparing dart objects.
Dart &	alpha0 ()
	Maps the dart to a different node.
Dart &	alpha1 ()
	Maps the dart to a different edge.
Dart &	alpha2 ()
	Maps the dart to a different triangle. Note: the dart is not changed if it is at the boundary!
Utilities not required by TTL
void	init (Edge *edge, bool dir=true)
double	x () const
double	y () const
bool	isCounterClockWise () const
Node *	getNode () const
Node *	getOppositeNode () const
Edge *	getEdge () const
Private Attributes
Edge *	edge_
bool	dir_

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Detailed Description

Dart class for the half-edge data structure.

See Application Programming Interface to TTL (API) for a detailed description of how the member functions should be implemented.

Definition at line 47 of file HeDart.h.

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Constructor & Destructor Documentation

hed::Dart::Dart

(

)

[inline]

Default constructor.

Definition at line 54 of file HeDart.h.

References dir_, and edge_.

{ edge_ = NULL; dir_ = true; }

hed::Dart::Dart	(	Edge *	edge,
		bool	dir = true
	)			[inline]

Constructor.

Definition at line 57 of file HeDart.h.

References dir_, and edge_.

{ edge_ = edge; dir_ = dir; }

hed::Dart::Dart

(

const Dart &

dart

)

[inline]

Copy constructor.

Definition at line 60 of file HeDart.h.

References dir_, and edge_.

{ edge_ = dart.edge_; dir_ = dart.dir_; }

hed::Dart::~Dart

(

)

[inline]

Destructor.

Definition at line 63 of file HeDart.h.

{}

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Member Function Documentation

Dart& hed::Dart::alpha0

(

)

[inline]

Maps the dart to a different node.

Definition at line 87 of file HeDart.h.

References dir_.

Referenced by hed::TTLtraits::crossProduct2d(), and hed::TTLtraits::scalarProduct2d().

{ dir_ = !dir_; return *this; }

Dart& hed::Dart::alpha1

(

)

[inline]

Maps the dart to a different edge.

Definition at line 90 of file HeDart.h.

References dir_, edge_, and hed::Edge::getNextEdgeInFace().

                   {
      if (dir_) {
        edge_ = edge_->getNextEdgeInFace()->getNextEdgeInFace();
        dir_ = false;
      }
      else {
        edge_ = edge_->getNextEdgeInFace();
        dir_ = true;
      }
      return *this;
    }

Dart& hed::Dart::alpha2

(

)

[inline]

Maps the dart to a different triangle. Note: the dart is not changed if it is at the boundary!

Definition at line 103 of file HeDart.h.

References dir_, edge_, and hed::Edge::getTwinEdge().

                   {
      if (edge_->getTwinEdge()) {
        edge_ = edge_->getTwinEdge();
        dir_ = !dir_;
      }
      // else, the dart is at the boundary and should not be changed
      return *this;
    }

Edge* hed::Dart::getEdge

(

)

const [inline]

Definition at line 128 of file HeDart.h.

References edge_.

Referenced by hed::TTLtraits::removeBoundaryTriangle(), hed::TTLtraits::reverse_splitTriangle(), hed::TTLtraits::splitTriangle(), and hed::TTLtraits::swapEdge().

{ return edge_; }

Node* hed::Dart::getNode

(

)

const [inline]

Definition at line 126 of file HeDart.h.

References dir_, edge_, hed::Edge::getSourceNode(), and hed::Edge::getTargetNode().

Referenced by x(), and y().

{ return dir_ ? edge_->getSourceNode() : edge_->getTargetNode(); }

Node* hed::Dart::getOppositeNode

(

)

const [inline]

Definition at line 127 of file HeDart.h.

References dir_, edge_, hed::Edge::getSourceNode(), and hed::Edge::getTargetNode().

{ return dir_ ? edge_->getTargetNode() : edge_->getSourceNode(); }

void hed::Dart::init	(	Edge *	edge,
		bool	dir = true
	)			[inline]

Definition at line 119 of file HeDart.h.

References dir_, and edge_.

Referenced by hed::TTLtraits::splitTriangle().

{ edge_ = edge; dir_ = dir; }

bool hed::Dart::isCounterClockWise

(

)

const [inline]

Definition at line 124 of file HeDart.h.

References dir_.

{ return dir_; }

bool hed::Dart::operator!=

(

const Dart &

dart

)

const [inline]

Comparing dart objects.

Definition at line 82 of file HeDart.h.

                                            {
      return !(dart==*this);
    }

Dart& hed::Dart::operator=

(

const Dart &

dart

)

[inline]

Assignment operator.

Definition at line 66 of file HeDart.h.

References dir_, and edge_.

                                        {
      if (this == &dart)
        return *this;
      edge_ = dart.edge_;
      dir_  = dart.dir_;
      return *this;
    }

bool hed::Dart::operator==

(

const Dart &

dart

)

const [inline]

Comparing dart objects.

Definition at line 75 of file HeDart.h.

References dir_, and edge_.

                                            {
      if (dart.edge_ == edge_ && dart.dir_ == dir_)
        return true;
      return false;
    }

double hed::Dart::x

(

)

const [inline]

Definition at line 121 of file HeDart.h.

References getNode(), and hed::Node::x().

Referenced by hed::TTLtraits::crossProduct2d(), hed::TTLtraits::orient2d(), and hed::TTLtraits::scalarProduct2d().

{ return getNode()->x(); } // x-coordinate of source node

double hed::Dart::y

(

)

const [inline]

Definition at line 122 of file HeDart.h.

References getNode(), and hed::Node::y().

Referenced by hed::TTLtraits::crossProduct2d(), hed::TTLtraits::orient2d(), and hed::TTLtraits::scalarProduct2d().

{ return getNode()->y(); } // y-coordinate of source node

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Member Data Documentation

bool hed::Dart::dir_ [private]

Definition at line 50 of file HeDart.h.

Referenced by alpha0(), alpha1(), alpha2(), Dart(), getNode(), getOppositeNode(), init(), isCounterClockWise(), operator=(), and operator==().

Edge* hed::Dart::edge_ [private]

Definition at line 49 of file HeDart.h.

Referenced by alpha1(), alpha2(), Dart(), getEdge(), getNode(), getOppositeNode(), init(), operator=(), and operator==().

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The documentation for this class was generated from the following file:

• include/ttl/halfedge/HeDart.h