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| Point2D Class Reference |
--- | --- | ---

Two dimensional point or position. More...

`#include "vigra/diff2d.hxx"`

Inheritance diagram for Point2D:

List of all members.

## Public Types
typedef Point2D | PixelType
typedef Point2D | value_type
typedef Point2D const & | reference
typedef Point2D | index_reference
typedef Point2D const * | pointer
## Public Methods
| Point2D ()
| Point2D (int x, int y)
| Point2D (Point2D const &v)
| Point2D (Diff2D const &v)
int | px () const
int | py () const
Point2D & | operator= (Diff2D const &v)
Point2D | operator- () const
Point2D & | operator+= (Diff2D const &offset)
Point2D & | operator-= (Diff2D const &offset)
reference | operator * () const
index_reference | operator() (int const &dx, int const &dy) const
index_reference | operator[] (Diff2D const &offset) const
pointer | operator-> () const

## Detailed Description

Two dimensional point or position.

Specializes Diff2D for the specification of a 2-dimensional point or position, in contrast to an extent (for the latter use Size2D).

        // access an image at a point
        value = image[Point2D(10, 20)];

#include "vigra/utilities.hxx"
Namespace: vigra

## Member Typedef Documentation

typedef Point2D index_reference

| the iterator's index reference type (return type of `iter[diff]`) Reimplemented from Diff2D.

typedef Point2D PixelType

| The iterator's value type: a coordinate. Reimplemented from Diff2D.

typedef Point2D const* pointer

| the iterator's pointer type (return type of `iter.operator->()`) Reimplemented from Diff2D.

typedef Point2D const& reference

| the iterator's reference type (return type of `*iter`) Reimplemented from Diff2D.

typedef Point2D value_type

| The iterator's value type: a coordinate. Reimplemented from Diff2D.

## Constructor & Destructor Documentation

Point2D | ( |  | ) | `[inline]`

| Default Constructor. Init point at position (0,0)

Point2D | ( | int | x,
|  | int | y
| ) | `[inline]`

| Construct point at given position.

Point2D | ( | Point2D const & | v | ) | `[inline]`

| Copy Constructor.

Point2D | ( | Diff2D const & | v | ) | `[inline, explicit]`

| Explicit conversion Constructor.

## Member Function Documentation

reference operator * | ( |  | ) | const`[inline]`

| Access current point coordinate. Reimplemented from Diff2D.

index_reference operator() | ( | int const & | dx,
|  | int const & | dy
| ) | const`[inline]`

| Read point coordinate at an offset. Reimplemented from Diff2D.

Point2D& operator+= | ( | Diff2D const & | offset | ) | `[inline]`

| Increase point coordinates by specified offset. Reimplemented from Diff2D.

Point2D operator- | ( |  | ) | const`[inline]`

| Unary negation. Reimplemented from Diff2D.

Point2D& operator-= | ( | Diff2D const & | offset | ) | `[inline]`

| Decrease point coordinates by specified offset. Reimplemented from Diff2D.

pointer operator-> | ( |  | ) | const`[inline]`

| Access current point coordinate. Reimplemented from Diff2D.

Point2D& operator= | ( | Diff2D const & | v | ) | `[inline]`

| Copy Assigment. Reimplemented from Diff2D.

index_reference operator[] | ( | Diff2D const & | offset | ) | const`[inline]`

| Read point coordinate at an offset. Reimplemented from Diff2D.

int px | ( |  | ) | const`[inline]`

| Query the points' x coordinate

int py | ( |  | ) | const`[inline]`

| Query the points' y coordinate

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

- vigra/diff2d.hxx

© Ullrich Köthe (koethe@informatik.uni-hamburg.de) Cognitive Systems Group, University of Hamburg, Germany | html generated using doxygen and Python VIGRA 1.3.2 (27 Jan 2005)