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#include <vector>
// THIS CLASS IS A TRANSLATION TO C++11 FROM THE REFERENCE
// JAVA IMPLEMENTATION OF THE IMPROVED PERLIN FUNCTION (see http://mrl.nyu.edu/~perlin/noise/)
// THE ORIGINAL JAVA IMPLEMENTATION IS COPYRIGHT 2002 KEN PERLIN
// I ADDED AN EXTRA METHOD THAT GENERATES A NEW PERMUTATION VECTOR (THIS IS NOT PRESENT IN THE ORIGINAL IMPLEMENTATION)
#ifndef PERLINNOISE_H
#define PERLINNOISE_H
class PerlinNoise {
// The permutation vector
std::vector<int> p;
public:
// Initialize with the reference values for the permutation vector
PerlinNoise();
// Generate a new permutation vector based on the value of seed
PerlinNoise(unsigned int seed);
// Get a noise value, for 2D images z can have any value
double noise(double x, double y, double z);
private:
double fade(double t);
double lerp(double t, double a, double b);
double grad(int hash, double x, double y, double z);
};
#endif
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