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// Speed: angular units over time units.
// The Angle class is not used here since normalization is not what we want.
// Last modified by DWF 1998-05-11
// Once again we have unnecessary roundoff if rad_per_second is the wrong
// storage representation.
/*
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"
double
Speed::rad (units per) const {
switch (per) {
case SECOND:
return rad_per_second;
case HOUR:
return rad_per_second * 3600.0;
case JULIAN_CENTURY:
return rad_per_second * 3155760000.0;
default:
assert (0);
}
// Silence bogus SGI compiler warning
return 0.0;
}
double
Speed::deg (units per) const {
double deg_per_second = rad_per_second * 180.0 / M_PI;
switch (per) {
case SECOND:
return deg_per_second;
case HOUR:
return deg_per_second * 3600.0;
case JULIAN_CENTURY:
return deg_per_second * 3155760000.0;
default:
assert (0);
}
// Silence bogus SGI compiler warning
return 0.0;
}
void
Speed::rad (double inval, units per) {
switch (per) {
case SECOND:
rad_per_second = inval;
break;
case HOUR:
rad_per_second = inval / 3600.0;
break;
case JULIAN_CENTURY:
rad_per_second = inval / 3155760000.0;
break;
default:
assert (0);
}
}
void
Speed::deg (double inval, units per) {
double rad_per = inval * M_PI / 180.0;
switch (per) {
case SECOND:
rad_per_second = rad_per;
break;
case HOUR:
rad_per_second = rad_per / 3600.0;
break;
case JULIAN_CENTURY:
rad_per_second = rad_per / 3155760000.0;
break;
default:
assert (0);
}
}
Speed &
Speed::operator+= (Speed a) {
rad_per_second += a.rad_per_second;
return (*this);
}
Speed &
Speed::operator*= (double a) {
rad_per_second *= a;
return (*this);
}
Speed operator+ (Speed a, Speed b) {
Speed t;
t.rad (a.rad(Speed::SECOND) + b.rad(Speed::SECOND), Speed::SECOND);
return t;
}
Speed operator* (double a, Speed b) {
Speed t;
t.rad (b.rad(Speed::SECOND) * a, Speed::SECOND);
return t;
}
Dstr &
Speed::ppdeg (unsigned precision, units per) {
static Dstr retbuf;
double temp = deg (per);
int signflag = 0;
retbuf = "";
// It's too hard to do the anti-360.00 thing here because of the carryover.
// (See Angle::ppdeg)
if (temp <= -360.0 || temp >= 360.0) {
char tempbuf[80];
int revs = (int) (temp / 360.0);
temp = fmod (temp, 360.0);
sprintf (tempbuf, "%5d", revs);
retbuf += tempbuf;
retbuf += 'r';
signflag = 1;
} else
retbuf += " ";
char tempbuf[80];
int width = precision + 5;
assert (width < 80);
if (signflag)
sprintf (tempbuf, "%+*.*f", width, (int)(precision), temp);
else
sprintf (tempbuf, "%*.*f", width, (int)(precision), temp);
retbuf += tempbuf;
return retbuf;
}
DegreesPerJulianCentury::DegreesPerJulianCentury (double inval) {
deg (inval, JULIAN_CENTURY);
}
DegreesPerHour::DegreesPerHour (double inval) {
deg (inval, HOUR);
}
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