# MPoint Class Reference [OpenMaya - API module for common classes]

`#include <MPoint.h>`

Collaboration diagram for MPoint:

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## Detailed Description

Implementation of a point.

This class provides an implementation of a point. Numerous convienence operators are provided to help with the manipulation of points. This includes operators that work with the MVector and MMatrix classes.

All methods that query the point are threadsafe, all methods that modify the point are not threadsafe.

Examples:

## Public Member Functions

MPoint ()
MPoint (const MPoint &srcpt)
MPoint (const MFloatPoint &srcpt)
MPoint (const MVector &src)
MPoint (const MFloatVector &src)
MPoint (double xx, double yy, double zz=0.0, double ww=1.0)
MPoint (const double d[4])
MPoint (const float d[4])
~MPoint ()
MStatus get (double[4]) const
MStatus get (float[4]) const
double operator[] (unsigned int i) const
double operator() (unsigned int i) const
MPointoperator= (const MPoint &src)
MVector operator- (const MPoint &other) const
MPoint operator+ (const MVector &other) const
MPoint operator- (const MVector &other) const
MPointoperator+= (const MVector &vector)
MPointoperator-= (const MVector &vector)
MPoint operator* (const double scale) const
MPoint operator/ (const double scale) const
MPoint operator* (const MMatrix &) const
MPointoperator*= (const MMatrix &)
bool operator== (const MPoint &other) const
bool operator!= (const MPoint &other) const
MPointcartesianize ()
MPointrationalize ()
MPointhomogenize ()
double distanceTo (const MPoint &other) const
bool isEquivalent (const MPoint &other, double tolerance=1.0e-10) const
double & operator[] (unsigned int i)
NO SCRIPT SUPPORT.
double & operator() (unsigned int i)
NO SCRIPT SUPPORT.

## Public Attributes

double x
the x component of the point
double y
the y component of the point
double z
the z component of the point
double w
the w component of the point

## Static Public Attributes

static const MPoint origin

## Friends

OPENMAYA_EXPORT MPoint operator* (const MMatrix &, const MPoint &)
NO SCRIPT SUPPORT.
OPENMAYA_EXPORT std::ostream & operator<< (std::ostream &os, const MPoint &p)
NO SCRIPT SUPPORT.

## Constructor & Destructor Documentation

 MPoint::MPoint ( ) ` [inline]`

Default constructor. The instance is initialized to the origin.

 MPoint::MPoint ( const MPoint & srcpt ) ` [inline]`

Copy constructor. Creates an new instance and initializes it to the same point as the given point.

Parameters:
 [in] srcpt The point object to copy from.

 MPoint::MPoint ( const MFloatPoint & srcpt )

Class constructor. Creates an new instance and initializes it to the x, y, z, w values of the given point.

Parameters:
 [in] srcpt the point object to copy

 MPoint::MPoint ( const MVector & src )

Class constructor. Creates an new instance and initializes it to the x, y, z values of the given vector. The w value is set to 1.0.

Parameters:
 [in] src the vector object to copy

 MPoint::MPoint ( const MFloatVector & src )

Class constructor. Creates an new instance and initializes it to the x, y, z values of the given vector. The w value is set to 1.0.

Parameters:
 [in] src the vector object to copy

 MPoint::MPoint ( double xx, double yy, double zz = `0.0`, double ww = `1.0` ) ` [inline]`

Create a new instance and initialize it to the given position.

Parameters:
 [in] xx The initial value of x. [in] yy The initial value of y. [in] zz The initial value of z. [in] ww The initial value of w.

 MPoint::MPoint ( const double d[4] ) ` [inline]`

Create a new instance and initialize it to the given position.

Parameters:
 [in] d array of 4 doubles used to initialize x, y, z, and w respectively.

 MPoint::MPoint ( const float d[4] ) ` [inline]`

Create a new instance and initialize it to the given position.

Parameters:
 [in] d An array of 4 floats used to initialize x, y, z, and w respectively.

 MPoint::~MPoint ( ) ` [inline]`

Class destructor.

## Member Function Documentation

 MStatus MPoint::get ( double dest[4] ) const` [inline]`

Copy the values of x, y, z, and w from the instance to the four elements of the given array of doubles.

Parameters:
 [out] dest The four element array of doubles.
Returns:
MS::kSuccess if dest is a non-zero pointer and MS::kFailure otherwise.

 MStatus MPoint::get ( float dest[4] ) const` [inline]`

Copy the values of x, y, z, and w from the instance to the four elements of the given array of floats.

Parameters:
 [out] dest The four element array of floats.
Returns:
MS::kSuccess if dest is a non-zero pointer and MS::kFailure otherwise.

 double MPoint::operator[] ( unsigned int i ) const` [inline]`

The index operator.

• If the argument is 0 it will return the x component of the constant instance.
• If the argument is 1 it will return the y component of the constant instance.
• If the argument is 2 it will return the z component of the constant instance.
• If the argument is 3 it will return the w component of the constant instance.
• Otherwise it will return the x component of the point.
Parameters:
 [in] i Value indicating which component to return.
Returns:
The value of the indicated component of the instance.

 double MPoint::operator() ( unsigned int i ) const` [inline]`

The index operator.

• If the argument is 0 it will return the x component of the constant instance.
• If the argument is 1 it will return the y component of the constant instance.
• If the argument is 2 it will return the z component of the constant instance.
• If the argument is 3 it will return the w component of the constant instance.
• Otherwise it will return the x component of the point.
Parameters:
 [in] i Value indicating which component to return.
Returns:
The value of the indicated component of the instance.

 MPoint & MPoint::operator= ( const MPoint & src ) ` [inline]`

The assignment operator.

Parameters:
 [in] src Point to copy from.
Returns:
A reference to the assigned point.

 MVector MPoint::operator- ( const MPoint & other ) const` [inline]`

The subtraction operator for two MPoints. The result is the MVector from the other point to this instance.

Parameters:
 [in] other The other point.
Returns:
MVector from the other point to this point

 MPoint MPoint::operator+ ( const MVector & other ) const` [inline]`

The addition operator for adding an MVector to an MPoint. A new point is returned whose position is that of the original point translated by the vector.

Parameters:
Returns:
The resulting point.

 MPoint MPoint::operator- ( const MVector & other ) const` [inline]`

The addition operator for subtracting an MVector from an MPoint. A new point is returned whose position is that of the original point translated by the inverse of the vector.

Parameters:
 [in] other Vector to substract.
Returns:
The resulting point.

 MPoint & MPoint::operator+= ( const MVector & vector ) ` [inline]`

The in-place addition operator for adding an MVector to an MPoint. The current instance is translated from its original position by the vector.

Parameters:
Returns:
A reference to the resulting point.

 MPoint & MPoint::operator-= ( const MVector & vector ) ` [inline]`

The in-place subtraction operator for subtracting an MVector from an MPoint. The current instance is translated from its original position by the inverse of the vector.

Parameters:
 [in] vector Vector to substract.
Returns:
A reference to the resulting point.

 MPoint MPoint::operator* ( const double scale ) const` [inline]`

The multipication operator that allows the vector to by scaled by the given double parameter. The x, y, and z components are each multiplied by the parameter. The w component remains unchanged.

Parameters:
 [in] scale The scale parameter.
Returns:
The resulting point.

 MPoint MPoint::operator/ ( const double scale ) const` [inline]`

The division operator that allows the vector to by scaled by the given double parameter. The x, y, and z components are each divided by the parameter. The w component remains unchanged.

Parameters:
 [in] scale The scale parameter.
Returns:
The resulting point.

 MPoint MPoint::operator* ( const MMatrix & right ) const

The multiplication operator for computing the product of this point instance with the given matrix.

Parameters:
 [in] right the MMatrix to right multiply by
Returns:
A point representing the product

 MPoint & MPoint::operator*= ( const MMatrix & right )

The in-place multiplication operator for computing the product of this point instance with the given matrix.

Parameters:
 [in] right the MMatrix to right multiply by
Returns:
A point representing the product

 bool MPoint::operator== ( const MPoint & other ) const` [inline]`

The equality operator.

Parameters:
 [in] other Point to compare with.
Returns:
True if all of the x, y, z components of the two points are identical.

 bool MPoint::operator!= ( const MPoint & other ) const` [inline]`

The inequality operator.

Parameters:
 [in] other Point to compare with.
Returns:
True if any of the x, y, z components of the two points are not identical.

 MPoint & MPoint::cartesianize ( )

If this point instance is of the form P(W*x, W*y, W*z, W), for some scale factor W != 0, then it is reset to be P(x, y, z, 1). This will only work correctly if the point is in homogenous form or cartesian form. If the point is in rational form, the results are not defined.

 MPoint & MPoint::rationalize ( )

If this point instance is of the form P(W*x, W*y, W*z, W) (ie. is in homogenous or (for W==1) cartesian form), for some scale factor W != 0, then it is reset to be P(x, y, z, W). This will only work correctly if the point is in homogenous or cartesian form. If the point is already in rational form, the resultsare not defined.

 MPoint & MPoint::homogenize ( )

If this point instance is of the form P(x, y, z, W) (ie. is in rational or (for W==1) cartesian form), for some scale factor W != 0, then it is reset to be P(W*x, W*y, W*z, W).

Examples:

 double MPoint::distanceTo ( const MPoint & other ) const` [inline]`

Return the distance between this instance and the point passed as an argument.

Parameters:
 [in] other The point to compute the distance to.
Returns:
The distance between the two points.
Examples:

 bool MPoint::isEquivalent ( const MPoint & other, double tol = `1.0e-10` ) const` [inline]`

Returns true if this instance of the point passed as an argument represent the same position within the specified tolerance.

Parameters:
 [in] other The other point to compare to. [in] tol The tolerance to use during the comparison.
Returns:
True if the points are equal within the given tolerance and false otherwise.

 double & MPoint::operator[] ( unsigned int i ) ` [inline]`

NO SCRIPT SUPPORT.

The index operator.

• If the argument is 0 it will return the x component of the instance.
• If the argument is 1 it will return the y component of the instance.
• If the argument is 2 it will return the z component of the instance.
• If the argument is 3 it will return the w component of the instance.
• Otherwise it will return the x component of the instance.
Parameters:
 [in] i Value indicating which component to return.
Returns:
The value of the indicated component of the instance.

 double & MPoint::operator() ( unsigned int i ) ` [inline]`

NO SCRIPT SUPPORT.

The index operator. If the argument is 0 it will return the x component of the instance. If the argument is 1 it will return the y component of the instance. If the argument is 2 it will return the z component of the instance. If the argument is 3 it will return the w component of the instance. Otherwise it will return the x component of the instance.

Parameters:
 [in] i Value indicating which component to return.
Returns:
The value of the indicated component of the instance.

## Friends And Related Function Documentation

 OPENMAYA_EXPORT MPoint operator* ( const MMatrix & left, const MPoint & right ) ` [friend]`

NO SCRIPT SUPPORT.

The multiplication operator for computing the product of this point instance with the given matrix that allows the matrix to be on the left side of the operator.

Parameters:
 [in] left the MMatrix to right multiply by [in] right this point instance
Returns:
A point representing the product

 OPENMAYA_EXPORT std::ostream& operator<< ( std::ostream & os, const MPoint & p ) ` [friend]`

NO SCRIPT SUPPORT.

Print the contents of the given MPoint on the given ostream. The format used is [x, y, z, w].

Parameters:
 [in] os the ostream to print to [in] p the MPoint whose value is to be printed
Returns:
The ostream reference, s, provided as the first parameter.

## Member Data Documentation

 const MPoint MPoint::origin` [static]`

A constant representing the origin - (0,0,0,1).

Examples: