colorMaps.h 4.23 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
/*******************************************************************************
* 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.           *
*                                                                              *
20
* Web site: http://cgogn.unistra.fr/                                  *
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
* Contact information: cgogn@unistra.fr                                        *
*                                                                              *
*******************************************************************************/

#ifndef __COLOR_MAPS_H__
#define __COLOR_MAPS_H__

namespace CGoGN
{

namespace Utils
{

inline Geom::Vec3f color_map_blue_green_red(float x)
{
	Geom::Vec3f r(0.0f) ;
	if (x < 0.0f)
		r[2] = 1.0f;
	else if (x < 0.5f)
	{
		r[1] = 2.0f * x;
		r[2] = 1.0f - 2.0f * x;
	}
	else if (x < 1.0f)
	{
		r[0] = 2.0f * x - 1.0f;
		r[1] = 2.0f - 2.0f * x;
	}
	else
		r[0] = 1.0f;
	return r;
}

inline Geom::Vec3f color_map_BCGYR(float x)
{
	Geom::Vec3f r(0.0f) ;
	if (x < 0.0f)
		r[2] = 1.0f;
	else if (x < 0.25f)
	{
		r[0] = 0.0f;
		r[1] = 4.0f * x;
		r[2] = 1.0f;
	}
	else if (x < 0.5f)
	{
		r[0] = 0.0f;
		r[1] = 1.0f;
		r[2] = 2.0f - 4.0f * x;
	}
	else if (x < 0.75f)
	{
		r[0] = 4.0f * x - 2.0f;
		r[1] = 1.0f;
		r[2] = 0.0f;
	}
	else if (x < 1.0f)
	{
		r[0] = 1.0f;
		r[1] = 4.0f - 4.0f * x;
		r[2] = 0.0f;
	}
	else
		r[0] = 1.0f;
	return r;
}

inline Geom::Vec3f color_map_blue_white_red(float x)
{
	Geom::Vec3f r(0.0f);
	if (x < 0.0f)
		r[2] = 1.0f;
	else if (x < 0.5f)
	{
		r[0] = 2.0f * x;
		r[1] = 2.0f * x;
		r[2] = 1.0f;
	}
	else if (x < 1.0f)
	{
		r[0] = 1.0f;
		r[1] = 2.0f - 2.0f * x;
		r[2] = 2.0f - 2.0f * x;
	}
	else
		r[0] = 1.0f;
	return r;
}

inline Geom::Vec3f color_map_cyan_white_red(float x)
{
	Geom::Vec3f r(0.0f);
	if (x < 0.0f)
		r[2] = 1.0f;
	else if (x < 0.5f)
	{
		r[0] = 2.0f * x;
		r[1] = 1.0f;
		r[2] = 1.0f;
	}
	else if (x < 1.0f)
	{
		r[0] = 1.0f;
		r[1] = 2.0f - 2.0f * x;
		r[2] = 2.0f - 2.0f * x;
	}
	else
		r[0] = 1.0f;
	return r;
}

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

#endif