hsbramp.c revision 546
/*
* Copyright (c) 1988-91 by Patrick J. Naughton.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation.
*
* This file is provided AS IS with no warranties of any kind. The author
* shall have no liability with respect to the infringement of copyrights,
* trade secrets or any patents by this file or any part thereof. In no
* event will the author be liable for any lost revenue or profits or
* other special, indirect and consequential damages.
*/
/*
* Copyright 1994 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* to whom the Software is furnished to do so, provided that the above
* copyright notice(s) and this permission notice appear in all copies of
* the Software and that both the above copyright notice(s) and this
* permission notice appear in supporting documentation.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
* OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Except as contained in this notice, the name of a copyright holder
* shall not be used in advertising or otherwise to promote the sale, use
* or other dealings in this Software without prior written authorization
* of the copyright holder.
*/
#ifndef lint
#endif
/*-
* hsbramp.c - Create an HSB ramp.
*
* Copyright (c) 1991 by Patrick J. Naughton.
*
* See xlock.c for copying information.
*
* Revision History:
* minor optimizations.
* 01-Sep-88: Written.
*/
#include <math.h>
void
hsb2rgb(H, S, B, r, g, b)
double H,
S,
B;
u_char *r,
*g,
*b;
{
int i;
double f;
double bb;
u_char p;
u_char q;
u_char t;
H -= floor(H); /* remove anything over 1 */
H *= 6.0;
i = floor(H); /* 0..5 */
f = H - (float) i; /* f = fractional part of H */
bb = 255.0 * B;
switch (i) {
case 0:
*g = t;
*b = p;
break;
case 1:
*r = q;
*b = p;
break;
case 2:
*r = p;
*b = t;
break;
case 3:
*r = p;
*g = q;
break;
case 4:
*r = t;
*g = p;
break;
case 5:
*g = p;
*b = q;
break;
}
}
/*
* Input is two points in HSB color space and a count
* of how many discreet rgb space values the caller wants.
*
* Output is that many rgb triples which describe a linear
* interpolate ramp between the two input colors.
*/
void
double h1,
s1,
b1,
h2,
s2,
b2;
int count;
*green,
*blue;
{
double dh;
double ds;
double db;
while (count--) {
}
}