BIAS::BresenhamCircle Class Reference

Scans a circle using Bresenham's integer arithmetic algorithm. More...

#include <Base/ImageUtils/BresenhamCircle.hh>

Public Member Functions
	BresenhamCircle ()
	Default constructor. More...
	BresenhamCircle (int center[2], int radius)
	Constructor. More...
bool	GetNext (int next[2])
	Returns the coordinate of the next point on the circle. More...
void	Init (int center[2], int radius)
	Initialises this BresenhamCircle with new center and radius. More...
	~BresenhamCircle ()
	Destructor. More...

Protected Attributes
int	center_ [2]
int	count_
int	current_ [2]
int	d_
int	deltaE_
int	deltaSE_
bool	initialized_
int	radius_

Detailed Description

Scans a circle using Bresenham's integer arithmetic algorithm.

• Either Init() or the according constructor have to be called before GetNext()
• Points on circle are not given in continous manner, i.e. subsequent calls to GetNext() return (x,y), (y,x), (x,-y), (y,-x), (-x,-y), (-y,-x), (-x,y), (-y,x)
• Fast

Author

fw, clean-up + refactoring by rwulff 02/2010

Examples:

ExampleBresenham.cpp.

Definition at line 43 of file BresenhamCircle.hh.

Constructor & Destructor Documentation

BIAS::BresenhamCircle::BresenhamCircle ( )

inline

Default constructor.

You have to call Init() by yourself before calling GetNext().

Definition at line 51 of file BresenhamCircle.hh.

BIAS::BresenhamCircle::BresenhamCircle ( int  center[2], int  radius  )

inline

Constructor.

Parameters

center	the center for this BresenhamCircle
radius	the radius for this BresenhamCircle

Definition at line 64 of file BresenhamCircle.hh.

References Init().

BIAS::BresenhamCircle::~BresenhamCircle ( )

inline

Destructor.

Definition at line 71 of file BresenhamCircle.hh.

Member Function Documentation

bool BIAS::BresenhamCircle::GetNext ( int  next[2] )

inline

Returns the coordinate of the next point on the circle.

Can be called in a while loop:

int nextCoords[2]; while (bresCirc.GetNext(nextCoords)){ // draw nextCoords in image }

Parameters

next	the returned coordinate of the next point on the circle

Returns

true if there are still points left on the circle or false if the circle is finished

Examples:

ExampleBresenham.cpp.

Definition at line 125 of file BresenhamCircle.hh.

References center_, count_, current_, d_, deltaE_, deltaSE_, and initialized_.

Referenced by BIAS::ImageDraw< StorageType >::CircleCenter(), BIAS::CylindricalRectification< InputStorageType, OutputStorageType >::DetermineCylindricCameraBoundriesSpherical_(), and BIAS::ColorHistogram< StorageType >::GenerateCircleHist().

void BIAS::BresenhamCircle::Init ( int  center[2], int  radius  )

inline

Initialises this BresenhamCircle with new center and radius.

Parameters

center	the new center for this BresenhamCircle
radius	the new radius for this BresenhamCircle

Definition at line 84 of file BresenhamCircle.hh.

References center_, count_, current_, d_, deltaE_, deltaSE_, initialized_, and radius_.

Referenced by BresenhamCircle(), and BIAS::ImageDraw< StorageType >::CircleCenter().

Member Data Documentation

int BIAS::BresenhamCircle::center_[2]

protected

Definition at line 203 of file BresenhamCircle.hh.

Referenced by GetNext(), and Init().

int BIAS::BresenhamCircle::count_

protected

Definition at line 209 of file BresenhamCircle.hh.

Referenced by GetNext(), and Init().

int BIAS::BresenhamCircle::current_[2]

protected

Definition at line 205 of file BresenhamCircle.hh.

Referenced by GetNext(), and Init().

int BIAS::BresenhamCircle::d_

protected

Definition at line 206 of file BresenhamCircle.hh.

Referenced by GetNext(), and Init().

int BIAS::BresenhamCircle::deltaE_

protected

Definition at line 207 of file BresenhamCircle.hh.

Referenced by GetNext(), and Init().

int BIAS::BresenhamCircle::deltaSE_

protected

Definition at line 208 of file BresenhamCircle.hh.

Referenced by GetNext(), and Init().

bool BIAS::BresenhamCircle::initialized_

protected

Definition at line 212 of file BresenhamCircle.hh.

Referenced by GetNext(), and Init().

int BIAS::BresenhamCircle::radius_

protected

Definition at line 204 of file BresenhamCircle.hh.

Referenced by Init().

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

• Base/ImageUtils/BresenhamCircle.hh