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// $Id: PredictionValue.cc 2641 2007-09-02 21:31:02Z flaterco $
/*
PredictionValue: A quantity in units of feet, meters, knots, or
knots squared. See also, Amplitude.
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "common.hh"
PredictionValue::PredictionValue ():
_value(0.0),
_units(Units::zulu) {}
PredictionValue::PredictionValue (Units::PredictionUnits units,
double value):
_value(value),
_units(units) {
assert (value == 0.0 || units != Units::zulu);
}
PredictionValue::PredictionValue (Amplitude a):
_value(a.val()),
_units(a.Units()) {}
PredictionValue::PredictionValue (NullablePredictionValue npv):
_value(npv.val()),
_units(npv.Units()) {}
// No return.
static void convbarf (Units::PredictionUnits fromunits,
Units::PredictionUnits tounits) {
Dstr details ("From ");
details += Units::longName (fromunits);
details += " to ";
details += Units::longName (tounits);
Global::barf (Error::IMPOSSIBLE_CONVERSION, details);
}
void PredictionValue::Units (Units::PredictionUnits units) {
if (_units == units)
Global::barf (Error::NO_CONVERSION, Error::nonfatal);
else {
switch (_units) {
case Units::zulu:
assert (_value == 0.0);
break;
case Units::feet:
if (units == Units::meters)
_value *= 0.3048;
else
convbarf (_units, units);
break;
case Units::meters:
if (units == Units::feet)
_value /= 0.3048;
else
convbarf (_units, units);
break;
case Units::knotsSquared:
if (units == Units::knots) {
// This is not mathematically correct, but it is tidematically correct.
if (_value < 0)
_value = -sqrt(fabs(_value));
else
_value = sqrt(_value);
} else
convbarf (_units, units);
break;
case Units::knots:
if (units == Units::knotsSquared) {
// This is used only in Station::predictTideEvents to set up
// the mark level.
// This is not mathematically correct, but it is tidematically correct.
if (_value < 0)
_value = -(_value*_value);
else
_value *= _value;
} else
convbarf (_units, units);
break;
default:
assert (false);
}
_units = units;
}
}
void PredictionValue::operator-= (PredictionValue subtrahend) {
operator+= (-subtrahend);
}
void PredictionValue::operator/= (double divisor) {
_value /= divisor;
}
void PredictionValue::convertAndAdd (PredictionValue addend) {
if (addend._units == Units::zulu) {
assert (addend._value == 0.0);
return;
}
if (_units != Units::zulu && _units != addend._units)
addend.Units (_units);
operator+= (addend);
}
// These insist that both values must have exactly the same units.
// 0 Zulu semantics are not (yet) implemented for these operations.
const PredictionValue operator+ (PredictionValue a, PredictionValue b) {
assert (a.Units() == b.Units());
return PredictionValue (a.Units(), a.val()+b.val());
}
const PredictionValue operator- (PredictionValue a, PredictionValue b) {
assert (a.Units() == b.Units());
return PredictionValue (a.Units(), a.val()-b.val());
}
const double operator/ (PredictionValue a, PredictionValue b) {
assert (a.Units() == b.Units());
return a.val()/b.val();
}
const PredictionValue operator/ (PredictionValue b, double a) {
b /= a;
return b;
}
static void harmonize (PredictionValue &a, PredictionValue &b) {
if (a.Units() != b.Units()) {
if (a.Units() == Units::zulu)
a.Units (b.Units());
else
b.Units (a.Units());
}
}
const bool operator> (PredictionValue a, PredictionValue b) {
harmonize (a, b);
return (a.val() > b.val());
}
const bool operator< (PredictionValue a, PredictionValue b) {
harmonize (a, b);
return (a.val() < b.val());
}
const bool operator<= (PredictionValue a, PredictionValue b) {
harmonize (a, b);
return (a.val() <= b.val());
}
const bool operator>= (PredictionValue a, PredictionValue b) {
harmonize (a, b);
return (a.val() >= b.val());
}
const bool operator== (PredictionValue a, PredictionValue b) {
harmonize (a, b);
return (a.val() == b.val());
}
const bool operator!= (PredictionValue a, PredictionValue b) {
harmonize (a, b);
return (a.val() != b.val());
}
const PredictionValue operator- (PredictionValue a) {
return PredictionValue (a.Units(), -a.val());
}
const PredictionValue abs (PredictionValue a) {
return PredictionValue (a.Units(), fabs(a.val()));
}
// Print in the form -XX.YY units (padding as needed)
void PredictionValue::print (Dstr &text_out) const {
char temp[80];
sprintf (temp, "% 6.2f %s", _value, Units::longName(_units));
text_out = temp;
}
void PredictionValue::printnp (Dstr &text_out) const {
char temp[80];
sprintf (temp, "%2.2f %s", _value, Units::shortName(_units));
text_out = temp;
}
// Cleanup2006 Done
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