man SbVec2f (Fonctions bibliothèques) -

NAME

SbVec2f -

SYNOPSIS



#include <Inventor/SbLinear.h>

Detailed Description

The SbVec2f class is a 2 dimensional vector with floating point coordinates.

This vector class is used by many other classes in Coin. It provides storage for a vector in 2 dimensions aswell as simple floating point arithmetic operations on this vector.

See also: SbVec2s, SbVec3s, SbVec3f, SbVec4f

Public Member Functions

SbVec2f (void)

SbVec2f (const float v[2])

SbVec2f (const float x, const float y)

float dot (const SbVec2f &v) const

SbBool equals (const SbVec2f &v, const float tolerance) const

const float * getValue (void) const

void getValue (float &x, float &y) const

float length (void) const

void negate (void)

float normalize (void)

SbVec2f & setValue (const float v[2])

SbVec2f & setValue (const float x, const float y)

float & operator[] (const int i)

const float & operator[] (const int i) const

SbVec2f & operator *= (const float d)

SbVec2f & operator/= (const float d)

SbVec2f & operator+= (const SbVec2f &u)

SbVec2f & operator-= (const SbVec2f &u)

SbVec2f operator- (void) const

void print (FILE *fp) const

Friends

SbVec2f operator * (const SbVec2f &v, const float d)

SbVec2f operator * (const float d, const SbVec2f &v)

SbVec2f operator/ (const SbVec2f &v, const float d)

SbVec2f operator+ (const SbVec2f &v1, const SbVec2f &v2)

SbVec2f operator- (const SbVec2f &v1, const SbVec2f &v2)

int operator== (const SbVec2f &v1, const SbVec2f &v2)

int operator!= (const SbVec2f &v1, const SbVec2f &v2)

Constructor & Destructor Documentation

SbVec2f::SbVec2f (void)

The default constructor does nothing. The vector coordinates will be uninitialized until you do a setValue().

SbVec2f::SbVec2f (const float v[2])

Constructs an SbVec2f instance with initial values from v.

SbVec2f::SbVec2f (const float x, const float y)

Constructs an SbVec2f instance with the initial vector endpoints from x and y.

Member Function Documentation

float SbVec2f::dot (const SbVec2f & v) const

Calculates and returns the result of taking the dot product of this vector and v.

SbBool SbVec2f::equals (const SbVec2f & v, const float tolerance) const

Compares the vector with v and returns TRUE if the distance between the vectors is smaller or equal to the square root of tolerance.

const float * SbVec2f::getValue (void) const

Returns a pointer to an array of two floats containing the x and y coordinates of the vector.

See also: setValue().

void SbVec2f::getValue (float & x, float & y) const

Returns the x and y coordinates of the vector.

See also: setValue().

float SbVec2f::length (void) const

Return length of vector.

void SbVec2f::negate (void)

Negate the vector (i.e. point it in the opposite direction).

float SbVec2f::normalize (void)

Normalize the vector to unit length. Return value is the original length of the vector before normalization.

SbVec2f & SbVec2f::setValue (const float v[2])

Set new x and y coordinates for the vector from v. Returns reference to self.

See also: getValue().

SbVec2f & SbVec2f::setValue (const float x, const float y)

Set new x and y coordinates for the vector. Returns reference to self.

See also: getValue().

float & SbVec2f::operator[] (const int i)

Index operator. Returns modifiable x or y coordinate.

See also: getValue() and setValue().

const float & SbVec2f::operator[] (const int i) const

Index operator. Returns x or y coordinate.

See also: getValue().

SbVec2f & SbVec2f::operator *= (const float d)

Multiply components of vector with value d. Returns reference to self.

SbVec2f & SbVec2f::operator/= (const float d)

Divides components of vector with value d. Returns reference to self.

SbVec2f & SbVec2f::operator+= (const SbVec2f & u)

Adds this vector and vector u. Returns reference to self.

SbVec2f & SbVec2f::operator-= (const SbVec2f & u)

Subtracts vector u from this vector. Returns reference to self.

SbVec2f SbVec2f::operator- (void) const

Non-destructive negation operator. Returns a new SbVec2f instance which points in the opposite direction of this vector.

See also: negate().

void SbVec2f::print (FILE * fp) const

Dump the state of this object to the file stream. Only works in debug version of library, method does nothing in an optimized compile.

Friends And Related Function Documentation

SbVec2f operator * (const SbVec2f & v, const float d) [friend]

Returns an SbVec2f instance which is the components of vector v multiplied with d.

SbVec2f operator * (const float d, const SbVec2f & v) [friend]

Returns an SbVec2f instance which is the components of vector v multiplied with d.

SbVec2f operator/ (const SbVec2f & v, const float d) [friend]

Returns an SbVec2f instance which is the components of vector v divided on the scalar factor d.

SbVec2f operator+ (const SbVec2f & v1, const SbVec2f & v2) [friend]

Returns an SbVec2f instance which is the sum of vectors v1 and v2.

SbVec2f operator- (const SbVec2f & v1, const SbVec2f & v2) [friend]

Returns an SbVec2f instance which is vector v2 subtracted from vector v1.

int operator== (const SbVec2f & v1, const SbVec2f & v2) [friend]

Returns 1 if v1 and v2 are equal, 0 otherwise.

See also: equals().

int operator!= (const SbVec2f & v1, const SbVec2f & v2) [friend]

Returns 1 if v1 and v2 are not equal, 0 if they are equal.

See also: equals().

Author

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