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101 lines
3.1 KiB
101 lines
3.1 KiB
2 years ago
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C The author of this software is Eric Grosse.
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C Permission to use, copy, modify, and distribute this software for any
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C purpose without fee is hereby granted, provided that this entire notice
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C is included in all copies of any software which is or includes a copy
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C or modification of this software and in all copies of the supporting
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C documentation for such software.
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C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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C This routine computes colors suitable for use in color level plots.
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C Typically s=v=1 and h varies from 0 (red) to 1 (blue) in
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C equally spaced steps. (h=.5 gives green; 1<h<1.5 gives magenta.)
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C To convert for frame buffer, use R = floor(255.999*pow(*r,1/gamma)) etc.
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C To get tables calibrated for other devices or to report complaints,
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C contact ehg@research.att.com.
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subroutine rainbow(h, s, v, r, g, b)
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real h, s, v
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real r, g, b
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INTEGER i
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REAL huettab(0:60)
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DATA huettab /0.0000, 0.0062, 0.0130, 0.0202, 0.0280,
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* 0.0365, 0.0457, 0.0559, 0.0671, 0.0796,
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* 0.0936, 0.1095, 0.1275, 0.1482, 0.1806,
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* 0.2113, 0.2393, 0.2652, 0.2892, 0.3119,
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* 0.3333, 0.3556, 0.3815, 0.4129, 0.4526,
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* 0.5060, 0.5296, 0.5501, 0.5679, 0.5834,
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* 0.5970, 0.6088, 0.6191, 0.6281, 0.6361,
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* 0.6430, 0.6490, 0.6544, 0.6590, 0.6631,
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* 0.6667, 0.6713, 0.6763, 0.6815, 0.6873,
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* 0.6937, 0.7009, 0.7092, 0.7190, 0.7308,
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* 0.7452, 0.7631, 0.7856, 0.8142, 0.8621,
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* 0.9029, 0.9344, 0.9580, 0.9755, 0.9889, 1.0000/
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C computed from the FMC-1 color difference formula
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C Barco monitor, max(r,g,b)=1, n=61 magenta, 2 Jan 1986
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H = 60.0 * MOD(H / 1.5, 1.)
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I = INT(H)
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H = huettab(i) + (huettab(i+1) - huettab(i)) * (h - i)
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CALL dhsv2rgb(h, s, v, r, g, b)
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RETURN
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END
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SUBROUTINE dhsv2rgb(h, s, v, r, g, b)
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C...hexcone model...
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REAL h, s, v
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REAL r, g, b
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C...all variables in range [0,1[
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C...here, h=.667 gives blue, h=0 or 1 gives red.
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C...see Alvy Ray Smith, Color Gamut Transform Pairs, SIGGRAPH '78
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INTEGER i
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REAL f, m, n, k
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h = 6 * mod(h, 1.)
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i = int(h)
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f = h - i
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m = (1 - s)
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n = (1 - s * f)
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k = (1 - (s * (1 - f)))
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if (i .eq. 0) then
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r = 1
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g = k
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b = m
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else if (i .eq. 1) then
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r = n
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g = 1
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b = m
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else if (i .eq. 2) then
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r = m
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g = 1
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b = k
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else if (i .eq. 3) then
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r = m
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g = n
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b = 1
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else if (i .eq. 4) then
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r = k
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g = m
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b = 1
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else if (i .eq. 5) then
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r = 1
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g = m
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b = n
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end if
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f = max(r, g, b)
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f = v / f
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r = r * f
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g = g * f
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b = b * f
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return
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end
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