terminus::PerlinNoise Class Reference

The PerlinNoise class implements a two dimensional noise function using multiple selectable gradient vector grids (layers). More...

#include <perlinnoise.h>

Public Member Functions
	PerlinNoise ()
	PerlinNoise (unsigned int seed)
void	seed (unsigned int seed)
	seeds the underlying random number generator and invalidates the previously generated gradient grids More...
unsigned int	seed () const
float	noise (int layer, float x, float y) const
	evaluates the noise function at the given coordinates More...
float	symmetricRnd () const
float	asymmetricRnd () const

Protected Member Functions
float	dotGradient (int layer, int iX, int iY, float x, float y) const
int	gradientIndex (int iX, int iY) const
void	generateGradients (int layer) const
std::vector< QVector2D > &	gradients (int layer) const

Protected Attributes
unsigned int	m_seed
std::default_random_engine	m_rng
std::uniform_real_distribution< float >	m_distSym
std::uniform_real_distribution< float >	m_distAsym
int	m_gradientCount
std::map< int, std::vector< QVector2D > >	m_gradientGrid

Static Protected Attributes
static const float	fScale = sqrt(2.f) / 2.f

Detailed Description

The PerlinNoise class implements a two dimensional noise function using multiple selectable gradient vector grids (layers).

Constructor & Destructor Documentation

terminus::PerlinNoise::PerlinNoise

(

)

terminus::PerlinNoise::PerlinNoise

(

unsigned int

seed

)

Member Function Documentation

float terminus::PerlinNoise::asymmetricRnd

(

)

const

Returns

a single random value from [0.0;1.0]

float terminus::PerlinNoise::dotGradient ( int  layer, int  iX, int  iY, float  x, float  y  ) const

protected

void terminus::PerlinNoise::generateGradients ( int  layer ) const

protected

int terminus::PerlinNoise::gradientIndex ( int  iX, int  iY  ) const

protected

std::vector< QVector2D > & terminus::PerlinNoise::gradients ( int  layer ) const

protected

float terminus::PerlinNoise::noise	(	int	layer,
		float	x,
		float	y
	)		const

evaluates the noise function at the given coordinates

Parameters

layer
x
y

Returns

noise value

The coordinates can exceed the size of the gradient grid, as they will be wrapped.

void terminus::PerlinNoise::seed

(

unsigned int

seed

)

seeds the underlying random number generator and invalidates the previously generated gradient grids

Parameters

seed

unsigned int terminus::PerlinNoise::seed

(

)

const

Returns

the seed that was last used to seed the underlying random number generator

float terminus::PerlinNoise::symmetricRnd

(

)

const

Returns

a single random value from [-1.0;1.0]

Member Data Documentation

const float terminus::PerlinNoise::fScale = sqrt(2.f) / 2.f

staticprotected

std::uniform_real_distribution<float> terminus::PerlinNoise::m_distAsym

mutableprotected

std::uniform_real_distribution<float> terminus::PerlinNoise::m_distSym

mutableprotected

int terminus::PerlinNoise::m_gradientCount

protected

std::map<int,std::vector<QVector2D> > terminus::PerlinNoise::m_gradientGrid

mutableprotected

std::default_random_engine terminus::PerlinNoise::m_rng

mutableprotected

unsigned int terminus::PerlinNoise::m_seed

protected

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

• source/util/perlinnoise.h
• source/util/perlinnoise.cpp