Define a 2-dimensional region by a polygon. More...

#include <LCPolygon.h>

Inheritance diagram for casacore::LCPolygon:

Public Member Functions
	LCPolygon ()

	LCPolygon (const Vector< Float > &x, const Vector< Float > &y, const IPosition &latticeShape)
	Construct from the given x and y values. More...

	LCPolygon (const Vector< Double > &x, const Vector< Double > &y, const IPosition &latticeShape)

	LCPolygon (const LCPolygon &other)
	Copy constructor (reference semantics). More...

virtual	~LCPolygon ()

LCPolygon &	operator= (const LCPolygon &other)
	Assignment (copy semantics). More...

virtual Bool	operator== (const LCRegion &other) const
	Comparison. More...

virtual LCRegion *	cloneRegion () const
	Make a copy of the derived object. More...

const Vector< Float > &	x () const
	Get the X-values. More...

const Vector< Float > &	y () const
	Get the Y-values. More...

virtual String	type () const
	Get the region type. More...

virtual TableRecord	toRecord (const String &tableName) const
	Convert the (derived) object to a record. More...

Public Member Functions inherited from casacore::LCRegionFixed
	LCRegionFixed ()

	LCRegionFixed (const IPosition &latticeShape)
	Construct with the lattice shape only. More...

	LCRegionFixed (const LCRegionFixed &other)
	Copy constructor (copy semantics). More...

virtual	~LCRegionFixed ()
	Destructor. More...

const ArrayLattice< Bool > &	getMask () const
	Return the mask. More...

Public Member Functions inherited from casacore::LCRegionSingle
	LCRegionSingle ()

	LCRegionSingle (const IPosition &latticeShape)
	Construct with the lattice shape only. More...

	LCRegionSingle (const LCRegionSingle &other)
	Copy constructor (copy semantics). More...

virtual	~LCRegionSingle ()

virtual Bool	hasMask () const
	Does the region have a mask? More...

const Array< Bool >	maskArray () const
	Get the mask (as an array). More...

Bool	masksEqual (const LCRegion &other) const
	Is the mask of this region the same as the mask of the other. More...

virtual void	set (const Bool &value)
	The following "put" functions are described in detail in class Lattice. More...

virtual void	apply (Bool(*function)(Bool))
	Replace every element, x, of the Lattice with the result of f(x). More...

virtual void	apply (Bool(*function)(const Bool &))

virtual void	apply (const Functional< Bool, Bool > &function)

virtual void	putAt (const Bool &value, const IPosition &where)
	Put the value of a single element. More...

virtual void	copyData (const Lattice< Bool > &from)
	Copy the data from the given lattice to this one. More...

Public Member Functions inherited from casacore::LCRegion
	LCRegion ()

	LCRegion (const IPosition &latticeShape)
	Construct with the lattice shape only. More...

	LCRegion (const LCRegion &other)
	Copy constructor (copy semantics). More...

virtual	~LCRegion ()

Bool	operator!= (const LCRegion &other) const
	Non-equality. More...

virtual Lattice< Bool > *	clone () const
	Make a copy of the derived object. More...

virtual void	handleDelete ()
	Handle deletion of the region by deleting possible tables. More...

virtual void	handleRename (const String &newName, Bool overwrite)
	Handle renaming the region by renaming possible tables. More...

const String &	comment () const
	Get or set the comment. More...

void	setComment (const String &comment)

LCRegion *	translate (const IPosition &translateVector) const
	Construct another LCRegion (for e.g. More...

LCRegion *	translate (const IPosition &translateVector, const IPosition &newLatticeShape) const

LCRegion *	translate (const Vector< Float > &translateVector) const

LCRegion *	translate (const Vector< Float > &translateVector, const IPosition &newLatticeShape) const

const IPosition &	latticeShape () const
	Give the full lattice shape. More...

const Slicer &	boundingBox () const
	Give the bounding box. More...

Slicer	expand (const Slicer &slicer) const
	Expand a slicer or position in the region to the full lattice. More...

IPosition	expand (const IPosition &index) const

virtual uInt	ndim () const
	Return the dimensionality of the region. More...

virtual IPosition	shape () const
	Return the shape of the region (i.e. More...

virtual Bool	isWritable () const
	Usually the lattice (i.e. More...

Public Member Functions inherited from casacore::Lattice< Bool >
virtual	~Lattice ()
	a virtual destructor is needed so that it will use the actual destructor in the derived class More...

virtual DataType	dataType () const
	Get the data type of the lattice. More...

Bool	operator() (const IPosition &where) const
	Return the value of the single element located at the argument IPosition. More...

virtual Bool	getAt (const IPosition &where) const

Bool	get (COWPtr< Array< Bool > > &buffer, Bool removeDegenerateAxes=False) const
	Functions which extract an Array of values from a Lattice. More...

Bool	get (Array< Bool > &buffer, Bool removeDegenerateAxes=False)

Array< Bool >	get (Bool removeDegenerateAxes=False) const

Bool	getSlice (COWPtr< Array< Bool > > &buffer, const Slicer &section, Bool removeDegenerateAxes=False) const

Bool	getSlice (COWPtr< Array< Bool > > &buffer, const IPosition &start, const IPosition &shape, Bool removeDegenerateAxes=False) const

Bool	getSlice (COWPtr< Array< Bool > > &buffer, const IPosition &start, const IPosition &shape, const IPosition &stride, Bool removeDegenerateAxes=False) const

Bool	getSlice (Array< Bool > &buffer, const Slicer &section, Bool removeDegenerateAxes=False)

Bool	getSlice (Array< Bool > &buffer, const IPosition &start, const IPosition &shape, Bool removeDegenerateAxes=False)

Bool	getSlice (Array< Bool > &buffer, const IPosition &start, const IPosition &shape, const IPosition &stride, Bool removeDegenerateAxes=False)

Array< Bool >	getSlice (const Slicer &section, Bool removeDegenerateAxes=False) const

Array< Bool >	getSlice (const IPosition &start, const IPosition &shape, Bool removeDegenerateAxes=False) const

Array< Bool >	getSlice (const IPosition &start, const IPosition &shape, const IPosition &stride, Bool removeDegenerateAxes=False) const

void	putSlice (const Array< Bool > &sourceBuffer, const IPosition &where, const IPosition &stride)
	A function which places an Array of values within this instance of the Lattice at the location specified by the IPosition "where", incrementing by "stride". More...

void	putSlice (const Array< Bool > &sourceBuffer, const IPosition &where)

void	put (const Array< Bool > &sourceBuffer)

void	operator+= (const Lattice< Bool > &other)
	Add, subtract, multiple, or divide by another Lattice. More...

void	operator-= (const Lattice< Bool > &other)

void	operator*= (const Lattice< Bool > &other)

void	operator/= (const Lattice< Bool > &other)

virtual void	copyDataTo (Lattice< Bool > &to) const
	Copy the data from this lattice to the given lattice. More...

virtual uInt	advisedMaxPixels () const
	This function returns the advised maximum number of pixels to include in the cursor of an iterator. More...

Public Member Functions inherited from casacore::LatticeBase
virtual	~LatticeBase ()
	A virtual destructor is needed so that it will use the actual destructor in the derived class. More...

virtual String	imageType () const
	Get the image type (returns name of derived class). More...

virtual Bool	isPersistent () const
	Is the lattice persistent and can it be loaded by other processes as well? That is the case for a PagedArray or PagedImage and for an ImageExpr which does not use transient lattices or regions. More...

virtual Bool	isPaged () const
	Is the lattice paged to disk? The default implementation returns False. More...

virtual Bool	canReferenceArray () const
	Can the lattice data be referenced as an array section? That is the case for an ArrayLattice or a Temp/SubLattice using it. More...

virtual void	save (const String &fileName) const
	Save the image in an AipsIO file with the given name. More...

virtual Bool	lock (FileLocker::LockType, uInt nattempts)
	It is strongly recommended to use class LatticeLocker to handle lattice locking. More...

virtual void	unlock ()

virtual Bool	hasLock (FileLocker::LockType) const

virtual void	resync ()
	Resynchronize the Lattice object with the lattice file. More...

virtual void	flush ()
	Flush the data (but do not unlock). More...

virtual void	tempClose ()
	Temporarily close the lattice. More...

virtual void	reopen ()
	Explicitly reopen the temporarily closed lattice. More...

virtual String	name (Bool stripPath=False) const
	Return the name of the current Lattice object. More...

virtual size_t	nelements () const
	Return the total number of elements in this Lattice. More...

size_t	size () const

Bool	conform (const LatticeBase &other) const
	Return a value of "True" if this instance of Lattice and 'other' have the same shape, otherwise returns a value of "False". More...

virtual LELCoordinates	lelCoordinates () const
	Return the coordinates of the lattice. More...

IPosition	niceCursorShape (uInt maxPixels) const
	Returns a recommended cursor shape for iterating through all the pixels in the Lattice. More...

IPosition	niceCursorShape () const

virtual Bool	ok () const
	Check class internals - used for debugging. More...

virtual uInt	maximumCacheSize () const
	Maximum cache size - not necessarily all used. More...

virtual void	setMaximumCacheSize (uInt howManyPixels)
	Set the maximum (allowed) cache size as indicated. More...

virtual void	setCacheSizeInTiles (uInt howManyTiles)
	Set the actual cache size for this Array to be big enough for the indicated number of tiles. More...

virtual void	setCacheSizeFromPath (const IPosition &sliceShape, const IPosition &windowStart, const IPosition &windowLength, const IPosition &axisPath)
	Set the cache size as to "fit" the indicated path. More...

virtual void	clearCache ()
	Clears and frees up the caches, but the maximum allowed cache size is unchanged from when setCacheSize was called. More...

virtual void	showCacheStatistics (ostream &os) const
	Report on cache success. More...

Static Public Member Functions
static String	className ()
	Get the class name (to store in the record). More...

static LCPolygon *	fromRecord (const TableRecord &, const String &tablename)
	Convert correct object from a record. More...

Static Public Member Functions inherited from casacore::LCRegion
static LCRegion *	fromRecord (const TableRecord &, const String &tableName)
	Convert correct object from a record. More...

Protected Member Functions
virtual LCRegion *	doTranslate (const Vector< Float > &translateVector, const IPosition &newLatticeShape) const
	Construct another LCPolygon (for e.g. More...

Protected Member Functions inherited from casacore::LCRegionFixed
LCRegionFixed &	operator= (const LCRegionFixed &other)
	Assignment (copy semantics) is only useful for derived classes. More...

void	setMask (const Array< Bool > &mask)
	Set the mask. More...

Protected Member Functions inherited from casacore::LCRegionSingle
LCRegionSingle &	operator= (const LCRegionSingle &other)
	Assignment (copy semantics) is only useful for derived classes. More...

void	setMaskPtr (Lattice< Bool > &mask)
	Set the pointer to the mask in the derived class. More...

virtual Bool	doGetSlice (Array< Bool > &buffer, const Slicer &section)
	Do the actual getting of the mask. More...

virtual void	doPutSlice (const Array< Bool > &sourceBuffer, const IPosition &where, const IPosition &stride)
	Do the actual putting of the mask. More...

virtual IPosition	doNiceCursorShape (uInt maxPixels) const
	Get the best cursor shape. More...

virtual LatticeIterInterface < Bool > *	makeIter (const LatticeNavigator &navigator, Bool useRef) const
	Make an iterator. More...

Protected Member Functions inherited from casacore::LCRegion
LCRegion &	operator= (const LCRegion &other)
	Assignment (copy semantics) is only useful for derived classes. More...

void	setBoundingBox (const Slicer &boundingBox)
	Sometimes it is inconvenient for a derived class to set the bounding box in the constructor. More...

void	setShapeAndBoundingBox (const IPosition &latticeShape, const Slicer &boundingBox)

void	defineRecordFields (RecordInterface &record, const String &className) const
	Define the type and class name in the record. More...

Protected Member Functions inherited from casacore::Lattice< Bool >
	Lattice ()
	Define default constructor to satisfy compiler. More...

	Lattice (const Lattice< Bool > &)
	Copy constructor and assignment can only be used by derived classes. More...

virtual void	handleMath (const Lattice< Bool > &from, int oper)
	Handle the Math operators (+=, -=, *=, /=). More...

virtual void	handleMathTo (Lattice< Bool > &to, int oper) const

Lattice< Bool > &	operator= (const Lattice< Bool > &)

Protected Member Functions inherited from casacore::LatticeBase
	LatticeBase ()
	Define default constructor to be used by derived classes. More...

	LatticeBase (const LatticeBase &)
	Copy constructor and assignment can only be used by derived classes. More...

LatticeBase &	operator= (const LatticeBase &)

void	throwBoolMath () const
	Throw an exception for arithmetic on a Bool Lattice. More...

Private Member Functions
void	defineBox ()
	Make the bounding box. More...

void	defineMask ()
	Define the mask to indicate which elements are inside the polygon. More...

void	fillMask (Bool mask, Int nx, Int ny, Int blcx, Int blcy, const Float ptrX, const Float *ptrY, uInt nrline)
	Fill the mask from the given points. More...

Int	truncateStart (Float v)
	Truncate a start value to a pixel point. More...

Int	truncateEnd (Float v, Int maxEnd)
	Truncate an end value to a pixel point. More...

Static Private Member Functions
static Bool	_isNear (Float val1, Float val2)
	takes into account when one value is zero and the other is absolutely (as opposed to relatively) near zero. More...

Private Attributes
Vector< Float >	itsX

Vector< Float >	itsY

Detailed Description

Define a 2-dimensional region by a polygon.

Intended use:

Public interface

Prerequisite

LCRegion

Synopsis

The LCPolygon class is a specialization of class LCRegion. It makes it possible to define a 2-dimensional region by means an ordered collection of points with straight lines connecting adjacent points. The last point can be equal to the first one. If not, an extra point gets added to form the closing line.

The polygon can be as complex as one likes. E.g. it is possible to have a rectangle with an inner rectangle to exclude interior points.

The points defining the polygon do not need to coincide with pixel points. Points may be outside the lattice meaning that only part of the polygon surface is actually used. However, at least some part of the polygon surface has to intersect with the lattice.
A lattice pixel is part of the polygon surface if the center of the pixel is on or inside the polygon. Note that 0 is the beginning ond 1 is the end of the first pixel. Thus 0.5 is its center.

Example

// A simple (tilted) square.
Vector<Float> x(4), y(4);
x(0)=3; y(0)=3;
x(1)=6; y(1)=6;
x(2)=3; y(2)=9;
x(3)=0; y(3)=6;
LCPolygon region(x, y, IPosition(2,128,128));
// A rectangle with an inner region to exclude interior points.
// Note that the last point is equal to the first point, thus
// the last line is given explicitly.
Vector<Float> x(11), y(11);
x(0)=3; y(0)=3;
x(1)=9; y(1)=3;
x(2)=9; y(2)=8;
x(3)=3; y(3)=8;
x(4)=3; y(4)=3;
x(5)=5; y(5)=5;
x(6)=8; y(6)=4;
x(7)=7; y(7)=7;
x(8)=5; y(8)=7;
x(9)=5; y(9)=5;
x(10)=3; y(10)=3;
LCPolygon region(x, y, IPosition(2,128,128));

Definition at line 109 of file LCPolygon.h.

Constructor & Destructor Documentation

casacore::LCPolygon::LCPolygon ( )

casacore::LCPolygon::LCPolygon	(	const Vector< Float > &	x,
		const Vector< Float > &	y,
		const IPosition &	latticeShape
	)

Construct from the given x and y values.

The latticeShape must define a 2-dimensional lattice.
LCPolygon can be used for an N-dimensional lattice by making another lattice representing any 2 axes from the original lattice.

casacore::LCPolygon::LCPolygon	(	const Vector< Double > &	x,
		const Vector< Double > &	y,
		const IPosition &	latticeShape
	)

casacore::LCPolygon::LCPolygon ( const LCPolygon & other )

Copy constructor (reference semantics).

virtual casacore::LCPolygon::~LCPolygon ( )

virtual

Member Function Documentation

static Bool casacore::LCPolygon::_isNear	(	Float	val1,
		Float	val2
	)

staticprivate

takes into account when one value is zero and the other is absolutely (as opposed to relatively) near zero.

static String casacore::LCPolygon::className ( )

static

Get the class name (to store in the record).

virtual LCRegion* casacore::LCPolygon::cloneRegion ( ) const

virtual

Make a copy of the derived object.

Implements casacore::LCRegion.

void casacore::LCPolygon::defineBox ( )

private

Make the bounding box.

void casacore::LCPolygon::defineMask ( )

private

Define the mask to indicate which elements are inside the polygon.

virtual LCRegion* casacore::LCPolygon::doTranslate	(	const Vector< Float > &	translateVector,
		const IPosition &	newLatticeShape
	)		const

protectedvirtual

Construct another LCPolygon (for e.g.

another lattice) by moving this one. It recalculates the bounding box. A positive translation value indicates "to right".

Implements casacore::LCRegion.

void casacore::LCPolygon::fillMask	(	Bool *	mask,
		Int	nx,
		Int	ny,
		Int	blcx,
		Int	blcy,
		const Float *	ptrX,
		const Float *	ptrY,
		uInt	nrline
	)

private

Fill the mask from the given points.

static LCPolygon* casacore::LCPolygon::fromRecord	(	const TableRecord &	,
		const String &	tablename
	)

static

Convert correct object from a record.

LCPolygon& casacore::LCPolygon::operator= ( const LCPolygon & other )

Assignment (copy semantics).

virtual Bool casacore::LCPolygon::operator== ( const LCRegion & other ) const

virtual

Comparison.

Reimplemented from casacore::LCRegionFixed.

virtual TableRecord casacore::LCPolygon::toRecord ( const String & tableName ) const

virtual

Convert the (derived) object to a record.

Implements casacore::LCRegion.

Int casacore::LCPolygon::truncateEnd	(	Float	v,
		Int	maxEnd
	)

private

Truncate an end value to a pixel point.

A pixel point is taken if near the value, otherwise floor(value). The returned value is never > maxEnd.

Int casacore::LCPolygon::truncateStart ( Float v )

private

Truncate a start value to a pixel point.

A pixel point is taken if near the value, otherwise floor(value+1). The returned value is never < 0.

virtual String casacore::LCPolygon::type ( ) const

virtual

Get the region type.

Returns className()

Implements casacore::LCRegion.

const Vector< Float > & casacore::LCPolygon::x ( ) const

inline

Get the X-values.

Definition at line 195 of file LCPolygon.h.

References itsX.

const Vector< Float > & casacore::LCPolygon::y ( ) const

inline

Get the Y-values.

Definition at line 199 of file LCPolygon.h.

References itsY.

Member Data Documentation

Vector<Float> casacore::LCPolygon::itsX

private

Definition at line 190 of file LCPolygon.h.

Referenced by x().

Vector<Float> casacore::LCPolygon::itsY

private

Definition at line 191 of file LCPolygon.h.

Referenced by y().

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

casa/casacore/lattices/LRegions/LCPolygon.h

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Member Functions

Static Private Member Functions

Private Attributes

Detailed Description

Intended use:

Prerequisite

Synopsis

Example

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation