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// $Id: Interval.cc,v 1.3 2002/12/19 18:40:45 flaterco Exp $
// Interval: what you get if you subtract two timestamps.
/*
Copyright (C) 1998 David Flater.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "common.hh"
Interval::Interval (interval_rep_t in_seconds) {
seconds = in_seconds;
}
Interval::Interval () {
seconds = 0;
}
// Takes meridian string of the form [-]HH:MM
Interval::Interval (const Dstr &in_meridian) {
int h, m;
char s;
char *hhmm = in_meridian.aschar();
if (sscanf (hhmm, "%d:%d", &h, &m) != 2) {
Dstr details ("The offending string was ");
details += in_meridian;
barf (BADHHMM, details);
}
if (sscanf (hhmm, "%c", &s) != 1) {
Dstr details ("The offending string was ");
details += in_meridian;
barf (BADHHMM, details);
}
if (h < 0 || s == '-')
m = -m;
seconds = h*HOURSECONDS + m*60;
}
interval_rep_t Interval::in_seconds () const {
return seconds;
}
// Convert seconds to Julian centuries (36525 days)
double Interval::in_Julian_centuries () const {
return ((double)seconds) / 3155760000.0;
}
Interval operator * (Interval a, unsigned b) {
return Interval (a.in_seconds() * b);
}
Interval operator * (Interval a, double b) {
return Interval ((interval_rep_t)(a.in_seconds() * b));
}
Angle operator* (Interval a, Speed b) {
return Radians (a.in_seconds() * b.rad (Speed::SECOND));
}
Angle operator* (Speed b, Interval a) {
return a * b;
}
Interval abs (Interval a) {
return Interval (labs (a.in_seconds()));
}
Interval operator- (Interval a) {
return Interval (- (a.in_seconds()));
}
int operator> (Interval a, Interval b) {
if (a.in_seconds() > b.in_seconds())
return 1;
return 0;
}
int operator< (Interval a, Interval b) {
if (a.in_seconds() < b.in_seconds())
return 1;
return 0;
}
int operator<= (Interval a, Interval b) {
if (a.in_seconds() <= b.in_seconds())
return 1;
return 0;
}
int operator== (Interval a, Interval b) {
if (a.in_seconds() == b.in_seconds())
return 1;
return 0;
}
Interval operator/ (Interval a, int b) {
return Interval (a.in_seconds() / b);
}
double operator/ (Interval a, Interval b) {
return ((double)(a.in_seconds()) / (double)(b.in_seconds()));
}
Interval operator+ (Interval a, Interval b) {
return Interval (a.in_seconds() + b.in_seconds());
}
Interval operator- (Interval a, Interval b) {
// Potential overflow/underflow
return Interval (a.in_seconds() - b.in_seconds());
}
void
Interval::operator-= (Interval a) {
// Potential overflow/underflow
seconds -= a.in_seconds();
}
#if 0
// This is not used anymore so it's not worth fixing the overflow.
void
Interval::as_hhmmss (Dstr &hhmmss_out) {
interval_rep_t temp = seconds;
hhmmss_out = (char *)NULL;
if (temp < 0) {
hhmmss_out += '-';
temp = -temp;
}
long hours = temp / HOURSECONDS;
temp %= HOURSECONDS;
long minutes = temp / 60;
long secs = temp % 60;
if (hours < 10)
hhmmss_out += '0';
hhmmss_out += hours;
hhmmss_out += ':';
if (minutes < 10)
hhmmss_out += '0';
hhmmss_out += minutes;
hhmmss_out += ':';
if (secs < 10)
hhmmss_out += '0';
hhmmss_out += secs;
}
ostream &operator<< (ostream &out, Interval a) {
Dstr temp;
a.as_hhmmss (temp);
out << temp;
return out;
}
#endif
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