colorMaps.hpp 4.36 KB
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/*******************************************************************************
* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps  *
* version 0.1                                                                  *
* Copyright (C) 2009, IGG Team, LSIIT, University of Strasbourg                *
*                                                                              *
* This library is free software; you can redistribute it and/or modify it      *
* under the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation; either version 2.1 of the License, or (at your     *
* option) any later version.                                                   *
*                                                                              *
* This library 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 Lesser General Public License  *
* for more details.                                                            *
*                                                                              *
* You should have received a copy of the GNU Lesser General Public License     *
* along with this library; if not, write to the Free Software Foundation,      *
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.           *
*                                                                              *
* Web site: http://cgogn.unistra.fr/                                  *
* Contact information: cgogn@unistra.fr                                        *
*                                                                              *
*******************************************************************************/
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#include <algorithm>
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namespace CGoGN
{

namespace Utils
{
template <typename FUNC>
inline void createTableColor01(std::vector<Geom::Vec3f>& table, unsigned int nb, FUNC f)
{
	table.reserve(nb);
	for (unsigned int i=0; i< nb; ++i)
	{
		float p = float(i)/float(nb);
		table.push_back(f(p));
	}
}


inline Geom::Vec3f color_map_blue_green_red(float x)
{
	if (x < 0.0f)
		return Geom::Vec3f(0.0f, 0.0f, 1.0f) ;

	if (x < 0.5f)
		return Geom::Vec3f(0.0f, 2.0f * x, 1.0f - 2.0f * x);

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	if (x < 1.0f)
		return Geom::Vec3f(2.0f * x - 1.0f, 2.0f - 2.0f * x, 0.0f);
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	return Geom::Vec3f(1.0f, 0.0f, 0.0f) ;
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}

inline Geom::Vec3f color_map_BCGYR(float x)
{
	if (x < 0.0f)
		return Geom::Vec3f(0.0f, 0.0f, 1.0f) ;

	if (x < 0.25f)
		return Geom::Vec3f(0.0f, 4.0f * x, 1.0f);

	if (x < 0.5f)
		return Geom::Vec3f(0.0f, 1.0 , 2.0f - 4.0f * x);

	if (x < 0.75f)
		return Geom::Vec3f(4.0f * x - 2.0f, 1.0f, 0.0f);

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	if (x < 1.0f)
		return Geom::Vec3f(1.0f, 4.0f - 4.0f * x, 0.0f);
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	return Geom::Vec3f(1.0f, 0.0f, 0.0f) ;
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}

inline Geom::Vec3f color_map_blue_white_red(float x)
{
	if (x < 0.0f)
		return Geom::Vec3f(0.0f, 0.0f, 1.0f) ;

	if (x < 0.5f)
		return Geom::Vec3f(2.0f * x, 2.0f * x, 1.0f);

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	if (x < 1.0f)
		return Geom::Vec3f(1.0f, 2.0f - 2.0f * x, 2.0f - 2.0f * x);
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	return Geom::Vec3f(1.0f, 0.0f, 0.0f) ;
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}

inline Geom::Vec3f color_map_cyan_white_red(float x)
{
	if (x < 0.0f)
		return Geom::Vec3f(0.0f, 0.0f, 1.0f) ;

	if (x < 0.5f)
		return Geom::Vec3f(2.0f * x, 1.0f , 1.0f);

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	if (x < 1.0f)
		return Geom::Vec3f(1.0f, 2.0f - 2.0f * x, 2.0f - 2.0f * x);
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	return Geom::Vec3f(1.0f, 0.0f, 0.0f) ;
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}




inline float scale_expand_within_0_1(float x, int n)
{
	for (int i = 1; i <= n; i++)
		x = (1.0f - cos(M_PI * x)) / 2.0f;
	for (int i = -1; i >= n; i--)
		x = acos(1.0f - 2.0f * x) / M_PI;
	return x;
}

inline float scale_expand_towards_1(float x, int n)
{
	for (int i = 1; i <= n; i++)
		x = sin(x * M_PI / 2.0f);
	for (int i = -1; i >= n; i--)
		x = asin(x) * 2.0f / M_PI;
	return x;
}

inline float scale_to_0_1(float x, float min, float max)
{
	return (x - min) / (max - min);
}

inline float scale_and_clamp_to_0_1(float x, float min, float max)
{
	float v = (x - min) / (max - min);
	return v < 0.0f ? 0.0f : (v > 1.0f ? 1.0f : v);
}

inline void scale_centering_around_0(float& min, float& max)
{
	float new_max = std::max(max, -min);
	min = std::min(min, -max);
	max = new_max;
}

inline float scale_to_0_1_around_one_half(float x, float min, float max)
{
	float ma = std::max(max, -min);
	float mi = std::min(min, -max);
	return (x - mi) / (ma - mi);
}

} // namespace Utils

} // namespace CGoGN