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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2016 Mario Luzeiro <mrluzeiro@ua.pt>
* Copyright (C) 1992-2016 KiCad Developers, see AUTHORS.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* @file PerlinNoise.h
* @brief This source code comes from the project:
* https://github.com/sol-prog/Perlin_Noise
*
* It was changed to work with floats instead of doubles
*
* Original copyright notice:
*
* Perlin_Noise
* "Here you could find the code for "Perlin noise in C++11",
* for more informations visit the project webpage:
* http://solarianprogrammer.com/2012/07/18/perlin-noise-cpp-11/
* You could use this program under the terms of GPL v3, for more details see:
* http://www.gnu.org/copyleft/gpl.html
* Copyright 2012 Sol from www.solarianprogrammer.com"
*/
#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 );
// Returns between 0.0f and 1.0f
float noise( float x, float y, float z ) const;
float noise( float x, float y ) const;
private:
float fade( float t ) const;
float lerp( float t, float a, float b ) const;
float grad( int hash, float x, float y, float z ) const;
float grad( int hash, float x, float y ) const;
};
#endif
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