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Some folks might think: “you still use RCS”?!? And we will say, hey, at least we switched from SCCS to RCS back in … I think it was around 1994 ... at least we are keeping up! :-) :-) :-) Logs say that SCCS version 18 became RCS version 19 on 1994 March 18. RCS served us well. But now it is time to move on. And so we are switching to git. Calc releases produce a lot of file changes. In the 125 releases of calc since 1996, when I started managing calc releases, there have been 15473 file mods!
381 lines
7.4 KiB
Plaintext
381 lines
7.4 KiB
Plaintext
/*
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* dms - calculate in degrees, minutes, and seconds (based on deg)
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*
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* Copyright (C) 1999,2010 David I. Bell and Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 1990/02/15 01:50:33
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* File existed as early as: before 1990
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*
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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obj dms {deg, min, sec};
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define dms(deg, min, sec)
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{
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local obj dms ans; /* return value */
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/* default missing args to 0 */
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if (isnull(sec)) {
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sec = 0;
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}
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if (isnull(min)) {
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min = 0;
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}
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/* load object */
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ans.deg = deg;
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ans.min = min;
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ans.sec = sec;
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/* return properly formed object */
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ans = fixdms(ans);
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return ans;
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}
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define dms_add(a, b)
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{
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local obj dms ans; /* return value */
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/* initalize value to 1st arg */
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if (istype(a, ans)) {
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/* 1st arg is dms object, load it */
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ans.deg = a.deg;
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ans.min = a.min;
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ans.sec = a.sec;
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} else {
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/* 1st arg is not dms, assume scalar degrees */
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ans.deg = a;
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ans.min = 0;
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ans.sec = 0;
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}
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/* add value of 2nd arg */
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if (istype(b, ans)) {
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/* 2nd arg is dms object, add it */
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ans.deg += b.deg;
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ans.min += b.min;
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ans.sec += b.sec;
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} else {
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/* 2nd arg is not dms, add scalar degrees */
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ans.deg += b;
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}
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/* return normalized result */
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ans = fixdms(ans);
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return ans;
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}
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define dms_neg(a)
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{
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local obj dms ans; /* return value */
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/* negate argument */
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if (istype(a, ans)) {
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/* 1st arg is dms object, load it */
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ans.deg = -a.deg;
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ans.min = -a.min;
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ans.sec = -a.sec;
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} else {
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/* 2nd arg is not dms, negate scalar degrees */
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ans.deg = -a;
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ans.min = 0;
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ans.sec = 0;
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}
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/* return normalized result */
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ans = fixdms(ans);
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return ans;
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}
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define dms_sub(a, b)
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{
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local obj dms ans; /* return value */
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/* initalize value to 1st arg */
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if (istype(a, ans)) {
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/* 1st arg is dms object, load it */
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ans.deg = a.deg;
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ans.min = a.min;
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ans.sec = a.sec;
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} else {
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/* 1st arg is not dms, assume scalar degrees */
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ans.deg = a;
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ans.min = 0;
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ans.sec = 0;
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}
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/* subtract value of 2nd arg */
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if (istype(b, ans)) {
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/* 2nd arg is dms object, subtract it */
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ans.deg -= b.deg;
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ans.min -= b.min;
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ans.sec -= b.sec;
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} else {
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/* 2nd arg is not dms, subtract scalar degrees */
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ans.deg -= b;
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}
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/* return normalized result */
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ans = fixdms(ans);
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return ans;
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}
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define dms_mul(a, b)
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{
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local obj dms ans; /* return value */
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/* dms object multiplication */
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if (istype(a, ans) && istype(b, ans)) {
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ans.deg = dms_abs(a) * dms_abs(b);
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ans.min = 0;
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ans.sec = 0;
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/* scalar multiplication */
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} else if (istype(a, ans)) {
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ans.deg = a.deg * b;
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ans.min = a.min * b;
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ans.sec = a.sec * b;
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} else {
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ans.deg = b.deg * a;
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ans.min = b.min * a;
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ans.sec = b.sec * a;
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}
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/* return normalized result */
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ans = fixdms(ans);
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return ans;
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}
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define dms_print(a)
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{
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local obj dms ans; /* temp object for dms type testing */
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/* firewall - arg must be a dms object */
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if (! istype(a, ans)) {
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quit "dms_print called with non dms object";
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}
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/* print in dms form */
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print a.deg : 'd' : a.min : 'm' : a.sec : 's' :;
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}
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define dms_abs(a)
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{
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local obj dms ans; /* temp object for dms type testing */
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local deg; /* return scalar value */
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/* firewall - just absolute value non dms objects */
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if (! istype(a, ans)) {
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return abs(a);
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}
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/* compute degrees */
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deg = a.deg + a.min / 60 + a.sec / 3600;
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/* return degrees */
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return deg;
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}
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define dms_norm(a)
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{
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local obj dms ans; /* temp object for dms type testing */
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local deg; /* degrees */
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/* firewall - arg must be a dms object */
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if (! istype(a, ans)) {
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quit "dms_norm called with non dms object";
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}
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/* square degrees (norm is the square of absolute value */
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deg = dms_abs(a);
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/* return degrees */
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return deg*deg;
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}
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define dms_test(a)
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{
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local obj dms ans; /* temp value */
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/* firewall - arg must be a dms object */
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if (! istype(a, ans)) {
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quit "dms_test called with non dms object";
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}
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/* return false of non-zero */
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ans = fixdms(a);
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if (ans.deg == 0 && ans.min == 0 && ans.sec == 0) {
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/* false */
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return 0;
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}
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/* true */
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return 1;
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}
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define dms_int(a)
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{
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local obj dms ans; /* return value */
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/* firewall - arg must be a dms object */
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if (! istype(a, ans)) {
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quit "dms_int called with non dms object";
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}
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/* normalize the argument */
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ans = fixdms(a);
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/* truncate to the nearest second */
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ans.sec = int(ans.sec);
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/* return value to the nearest second */
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return ans;
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}
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define dms_frac(a)
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{
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local obj dms ans; /* return value */
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/* firewall - arg must be a dms object */
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if (! istype(a, ans)) {
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quit "dms_frac called with non dms object";
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}
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/* normalize the argument */
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ans = fixdms(a);
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/* remove all but fractional seconds */
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ans.deg = 0;
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ans.min = 0;
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ans.sec = frac(ans.sec);
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/* return value to the second fraction */
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return ans;
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}
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define dms_rel(a,b)
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{
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local abs_a, abs_b; /* scalars of the arguments */
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/* compute scalars of the arguments */
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abs_a = dms_abs(a);
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abs_b = dms_abs(b);
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/* return the comparison */
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return cmp(abs_a, abs_b);
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}
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define dms_cmp(a,b)
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{
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local abs_a, abs_b; /* scalars of the arguments */
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/* compute scalars of the arguments */
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abs_a = dms_abs(a);
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abs_b = dms_abs(b);
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/* return the equality comparison */
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return (abs_a == abs_b);
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}
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define dms_inc(a)
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{
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local obj dms ans; /* return value */
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/* increment a dms object */
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if (istype(a, ans)) {
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ans = a;
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++ans.sec;
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/* return normalized result */
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ans = fixdms(ans);
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return ans;
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}
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/* increment a scalar */
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return a+1;
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}
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define dms_dec(a)
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{
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local obj dms ans; /* return value */
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/* decrement a dms object */
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if (istype(a, ans)) {
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ans = a;
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--ans.sec;
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/* return normalized result */
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ans = fixdms(ans);
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return ans;
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}
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/* decrement a scalar */
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return a-1;
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}
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define fixdms(a)
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{
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local obj dms ans; /* temp value */
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/* firewall */
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if (! istype(a, ans)) {
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quit "attempt to fix a non dms object";
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}
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/* force minutes to be intergral */
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a.min += frac(a.deg) * 60;
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a.deg = int(a.deg);
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/* force degrees to be intergral */
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a.sec += frac(a.min) * 60;
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a.min = int(a.min);
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/* carry excess seconds into minutes */
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a.min += a.sec // 60;
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a.sec %= 60;
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/* carry excess minutes into degrees */
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a.deg += a.min // 60;
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a.min %= 60;
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/* round degrees :-) */
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a.deg %= 360;
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/* return normalized result */
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return a;
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}
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if (config("resource_debug") & 3) {
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print "obj dms {deg, min, sec} defined";
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}
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