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| Current File : //usr/share/calc/dms.cal |
/*
* dms - calculate in degrees, minutes, and seconds (based on deg)
*
* Copyright (C) 1999,2010 David I. Bell and Landon Curt Noll
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* Calc 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.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Under source code control: 1990/02/15 01:50:33
* File existed as early as: before 1990
*
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
obj dms {deg, min, sec};
define dms(deg, min, sec)
{
local obj dms ans; /* return value */
/* default missing args to 0 */
if (isnull(sec)) {
sec = 0;
}
if (isnull(min)) {
min = 0;
}
/* load object */
ans.deg = deg;
ans.min = min;
ans.sec = sec;
/* return properly formed object */
ans = fixdms(ans);
return ans;
}
define dms_add(a, b)
{
local obj dms ans; /* return value */
/* initalize value to 1st arg */
if (istype(a, ans)) {
/* 1st arg is dms object, load it */
ans.deg = a.deg;
ans.min = a.min;
ans.sec = a.sec;
} else {
/* 1st arg is not dms, assume scalar degrees */
ans.deg = a;
ans.min = 0;
ans.sec = 0;
}
/* add value of 2nd arg */
if (istype(b, ans)) {
/* 2nd arg is dms object, add it */
ans.deg += b.deg;
ans.min += b.min;
ans.sec += b.sec;
} else {
/* 2nd arg is not dms, add scalar degrees */
ans.deg += b;
}
/* return normalized result */
ans = fixdms(ans);
return ans;
}
define dms_neg(a)
{
local obj dms ans; /* return value */
/* negate argument */
if (istype(a, ans)) {
/* 1st arg is dms object, load it */
ans.deg = -a.deg;
ans.min = -a.min;
ans.sec = -a.sec;
} else {
/* 2nd arg is not dms, negate scalar degrees */
ans.deg = -a;
ans.min = 0;
ans.sec = 0;
}
/* return normalized result */
ans = fixdms(ans);
return ans;
}
define dms_sub(a, b)
{
local obj dms ans; /* return value */
/* initalize value to 1st arg */
if (istype(a, ans)) {
/* 1st arg is dms object, load it */
ans.deg = a.deg;
ans.min = a.min;
ans.sec = a.sec;
} else {
/* 1st arg is not dms, assume scalar degrees */
ans.deg = a;
ans.min = 0;
ans.sec = 0;
}
/* subtract value of 2nd arg */
if (istype(b, ans)) {
/* 2nd arg is dms object, subtract it */
ans.deg -= b.deg;
ans.min -= b.min;
ans.sec -= b.sec;
} else {
/* 2nd arg is not dms, subtract scalar degrees */
ans.deg -= b;
}
/* return normalized result */
ans = fixdms(ans);
return ans;
}
define dms_mul(a, b)
{
local obj dms ans; /* return value */
/* dms object multiplication */
if (istype(a, ans) && istype(b, ans)) {
ans.deg = dms_abs(a) * dms_abs(b);
ans.min = 0;
ans.sec = 0;
/* scalar multiplication */
} else if (istype(a, ans)) {
ans.deg = a.deg * b;
ans.min = a.min * b;
ans.sec = a.sec * b;
} else {
ans.deg = b.deg * a;
ans.min = b.min * a;
ans.sec = b.sec * a;
}
/* return normalized result */
ans = fixdms(ans);
return ans;
}
define dms_print(a)
{
local obj dms ans; /* temp object for dms type testing */
/* firewall - arg must be a dms object */
if (! istype(a, ans)) {
quit "dms_print called with non dms object";
}
/* print in dms form */
print a.deg : 'd' : a.min : 'm' : a.sec : 's' :;
}
define dms_abs(a)
{
local obj dms ans; /* temp object for dms type testing */
local deg; /* return scalar value */
/* firewall - just absolute value non dms objects */
if (! istype(a, ans)) {
return abs(a);
}
/* compute degrees */
deg = a.deg + a.min / 60 + a.sec / 3600;
/* return degrees */
return deg;
}
define dms_norm(a)
{
local obj dms ans; /* temp object for dms type testing */
local deg; /* degrees */
/* firewall - arg must be a dms object */
if (! istype(a, ans)) {
quit "dms_norm called with non dms object";
}
/* square degrees (norm is the square of absolute value */
deg = dms_abs(a);
/* return degrees */
return deg*deg;
}
define dms_test(a)
{
local obj dms ans; /* temp value */
/* firewall - arg must be a dms object */
if (! istype(a, ans)) {
quit "dms_test called with non dms object";
}
/* return false of non-zero */
ans = fixdms(a);
if (ans.deg == 0 && ans.min == 0 && ans.sec == 0) {
/* false */
return 0;
}
/* true */
return 1;
}
define dms_int(a)
{
local obj dms ans; /* return value */
/* firewall - arg must be a dms object */
if (! istype(a, ans)) {
quit "dms_int called with non dms object";
}
/* normalize the argument */
ans = fixdms(a);
/* truncate to the nearest second */
ans.sec = int(ans.sec);
/* return value to the nearest second */
return ans;
}
define dms_frac(a)
{
local obj dms ans; /* return value */
/* firewall - arg must be a dms object */
if (! istype(a, ans)) {
quit "dms_frac called with non dms object";
}
/* normalize the argument */
ans = fixdms(a);
/* remove all but fractional seconds */
ans.deg = 0;
ans.min = 0;
ans.sec = frac(ans.sec);
/* return value to the second fraction */
return ans;
}
define dms_rel(a,b)
{
local abs_a, abs_b; /* scalars of the arguments */
/* compute scalars of the arguments */
abs_a = dms_abs(a);
abs_b = dms_abs(b);
/* return the comparison */
return cmp(abs_a, abs_b);
}
define dms_cmp(a,b)
{
local abs_a, abs_b; /* scalars of the arguments */
/* compute scalars of the arguments */
abs_a = dms_abs(a);
abs_b = dms_abs(b);
/* return the equality comparison */
return (abs_a == abs_b);
}
define dms_inc(a)
{
local obj dms ans; /* return value */
/* increment a dms object */
if (istype(a, ans)) {
ans = a;
++ans.sec;
/* return normalized result */
ans = fixdms(ans);
return ans;
}
/* increment a scalar */
return a+1;
}
define dms_dec(a)
{
local obj dms ans; /* return value */
/* decrement a dms object */
if (istype(a, ans)) {
ans = a;
--ans.sec;
/* return normalized result */
ans = fixdms(ans);
return ans;
}
/* decrement a scalar */
return a-1;
}
define fixdms(a)
{
local obj dms ans; /* temp value */
/* firewall */
if (! istype(a, ans)) {
quit "attempt to fix a non dms object";
}
/* force minutes to be intergral */
a.min += frac(a.deg) * 60;
a.deg = int(a.deg);
/* force degrees to be intergral */
a.sec += frac(a.min) * 60;
a.min = int(a.min);
/* carry excess seconds into minutes */
a.min += a.sec // 60;
a.sec %= 60;
/* carry excess minutes into degrees */
a.deg += a.min // 60;
a.min %= 60;
/* round degrees :-) */
a.deg %= 360;
/* return normalized result */
return a;
}
if (config("resource_debug") & 3) {
print "obj dms {deg, min, sec} defined";
}