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/*
* Demo of the gltt graphics library
* Copyright (C) 1998 Stephane Rehel
*
* January 1998
*/
#include <math.h>
#include "hsv_to_rgb.h"
/////////////////////////////////////////////////////////////////////////////
void hsv_to_rgb( double h, double s, double v,
double* r, double* g, double* b )
{
double xh = fmod( h*360., 360 ) / 60.0,
i = floor(xh),
f = xh - i,
p1 = v * (1 - s),
p2 = v * (1 -(s * f)),
p3 = v * (1 -(s * (1 - f)));
switch( (int) i )
{
case 0: *r= v; *g= p3; *b= p1; break;
case 1: *r= p2; *g= v; *b= p1; break;
case 2: *r= p1; *g= v; *b= p3; break;
case 3: *r= p1; *g= p2; *b= v; break;
case 4: *r= p3; *g= p1; *b= v; break;
case 5: *r= v; *g= p1; *b= p2; break;
}
}
/////////////////////////////////////////////////////////////////////////////
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