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Skunkware 5
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deg.cal
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1995-07-17
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/*
* Copyright (c) 1993 David I. Bell
* Permission is granted to use, distribute, or modify this source,
* provided that this copyright notice remains intact.
*
* Calculate in degrees, minutes, and seconds.
*/
obj dms {deg, min, sec};
define dms(deg, min, sec)
{
local ans;
if (isnull(sec))
sec = 0;
if (isnull(min))
min = 0;
obj dms ans;
ans.deg = deg;
ans.min = min;
ans.sec = sec;
fixdms(&ans);
return ans;
}
define dms_add(a, b)
{
local obj dms ans;
ans.deg = 0;
ans.min = 0;
ans.sec = 0;
if (istype(a, ans)) {
ans.deg += a.deg;
ans.min += a.min;
ans.sec += a.sec;
} else
ans.deg += a;
if (istype(b, ans)) {
ans.deg += b.deg;
ans.min += b.min;
ans.sec += b.sec;
} else
ans.deg += b;
fixdms(&ans);
return ans;
}
define dms_neg(a)
{
local obj dms ans;
ans.deg = -ans.deg;
ans.min = -ans.min;
ans.sec = -ans.sec;
return ans;
}
define dms_sub(a, b)
{
return a - b;
}
define dms_mul(a, b)
{
local obj dms ans;
if (istype(a, ans) && istype(b, ans))
quit "Cannot multiply degrees together";
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;
}
fixdms(&ans);
return ans;
}
define dms_print(a)
{
print a.deg : 'd' : a.min : 'm' : a.sec : 's' :;
}
define dms_abs(a)
{
return a.deg + a.min / 60 + a.sec / 3600;
}
define fixdms(a)
{
a.min += frac(a.deg) * 60;
a.deg = int(a.deg);
a.sec += frac(a.min) * 60;
a.min = int(a.min);
a.min += a.sec // 60;
a.sec %= 60;
a.deg += a.min // 60;
a.min %= 60;
a.deg %= 360;
}
global lib_debug;
if (lib_debug >= 0) {
print "obj dms {deg, min, sec} defined";
print "dms(deg, min, sec) defined";
print "dms_add(a, b) defined";
print "dms_neg(a) defined";
print "dms_sub(a, b) defined";
print "dms_mul(a, b) defined";
print "dms_print(a) defined";
print "dms_abs(a) defined";
}