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tdeedu/kstars/kstars/dms.h

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/***************************************************************************
dms.h - K Desktop Planetarium
-------------------
begin : Sun Feb 11 2001
copyright : (C) 2001 by Jason Harris
email : jharris@30doradus.org
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifndef DMS_H
#define DMS_H
#include <math.h>
#include <tqstring.h>
#include <kdebug.h>
//TODO: Remove these when KStarsDateTime is added!
#define J2000 2451545.0 //Julian Date for noon on Jan 1, 2000 (epoch J2000)
//defined here because this file is included in every other class.
#define B1950 2433282.4235 // Julian date for Jan 0.9235, 1950
/**@class dms
*@short An angle, stored as degrees, but expressible in many ways.
*@author Jason Harris
*@version 1.0
*dms encapsulates an angle. The angle is stored as a double,
*equal to the value of the angle in degrees. Methods are available
*for setting/getting the angle as a floating-point measured in
*Degrees or Hours, or as integer triplets (degrees, arcminutes,
*arcseconds or hours, minutes, seconds). There is also a method
*to set the angle according to a radian value, and to return the
*angle expressed in radians. Finally, a SinCos() method computes
*the sin and cosine of the angle. Once computed, the sin and cos
*values are stored, so that subsequent SinCos() calls will be faster.
*/
class dms {
public:
/**@short Default Constructor.
*
*Set the floating-point value of the angle according to the four integer arguments.
*@param d degree portion of angle (int). Defaults to zero.
*@param m arcminute portion of angle (int). Defaults to zero.
*@param s arcsecond portion of angle (int). Defaults to zero.
*@param ms arcsecond portion of angle (int). Defaults to zero.
*/
dms( const int &d=0, const int &m=0, const int &s=0, const int &ms=0 ) { setD( d, m, s, ms ); }
/**@short Construct an angle from a double value.
*
*Creates an angle whose value in Degrees is equal to the argument.
*@param x angle expressed as a floating-point number (in degrees)
*/
dms( const double &x ) { setD( x ); }
/**@short Construct an angle from a string representation.
*
*Attempt to create the angle according to the string argument. If the string
*cannot be parsed as an angle value, the angle is set to zero.
*
*@warning There is not an unambiguous notification that it failed to parse the string,
*since the string could have been a valid representation of zero degrees.
*If this is a concern, use the setFromString() function directly instead.
*
*@param s the string to parse as a dms value.
*@param isDeg if true, value is in degrees; if false, value is in hours.
*@sa setFromString()
*/
dms( const TQString &s, bool isDeg=true ) { setFromString( s, isDeg ); }
/**Destructor (empty).
*/
~dms() {}
/**@return integer degrees portion of the angle
*/
const int degree() const { return int( D ) ; }
/**@return integer arcminutes portion of the angle.
*@note an arcminute is 1/60 degree.
*/
const int arcmin() const;
/**@return integer arcseconds portion of the angle
*@note an arcsecond is 1/60 arcmin, or 1/3600 degree.
*/
const int arcsec() const;
/**@return integer milliarcseconds portion of the angle
*@note a milliarcsecond is 1/1000 arcsecond.
*/
const int marcsec() const;
/**@return angle in degrees expressed as a double.
*/
const double& Degrees() const { return D; }
/**@return integer hours portion of the angle
*@note an angle can be measured in degrees/arcminutes/arcseconds
*or hours/minutes/seconds. An hour is equal to 15 degrees.
*/
const int hour() const { return int( reduce().Degrees()/15.0 ); }
/**@return integer minutes portion of the angle
*@note a minute is 1/60 hour (not the same as an arcminute)
*/
const int minute() const;
/**@return integer seconds portion of the angle
*@note a second is 1/3600 hour (not the same as an arcsecond)
*/
const int second() const;
/**@return integer milliseconds portion of the angle
*@note a millisecond is 1/1000 second (not the same as a milliarcsecond)
*/
const int msecond() const;
/**@return angle in hours expressed as a double.
*@note an angle can be measured in degrees/arcminutes/arcseconds
*or hours/minutes/seconds. An hour is equal to 15 degrees.
*/
const double Hours() const { return reduce().Degrees()/15.0; }
/**Sets integer degrees portion of angle, leaving the arcminute and
*arcsecond values intact.
*@param d new integer degrees value
*/
void setDeg( const int &d ) { setD( d, arcmin(), arcsec() ); }
/**Sets integer arcminutes portion of angle, leaving the degrees
*and arcsecond values intact.
*@param m new integer arcminutes value
*/
void setArcMin( const int &m ) { setD( degree(), m, arcsec() ); }
/**Sets integer arcseconds portion of angle, leaving the degrees
*and arcminute values intact.
*@param s new integer arcseconds value
*/
void setArcSec( const int &s ) { setD( degree(), arcmin(), s ); }
/**Sets floating-point value of angle, in degrees.
*@param x new angle (double)
*/
void setD( const double &x );
/**@short Sets floating-point value of angle, in degrees.
*
*This is an overloaded member function; it behaves essentially
*like the above function. The floating-point value of the angle
*(D) is determined from the following formulae:
*
*\f$ fabs(D) = fabs(d) + \frac{(m + (s/60))}{60} \f$
*\f$ sgn(D) = sgn(d) \f$
*
*@param d integer degrees portion of angle
*@param m integer arcminutes portion of angle
*@param s integer arcseconds portion of angle
*@param ms integer arcseconds portion of angle
*/
void setD( const int &d, const int &m, const int &s, const int &ms=0 );
/**Sets integer hours portion of angle, leaving the minutes and
*seconds values intact.
*@param h new integer hours value
*@sa setH() setDeg()
*/
void setHour( const int &h ) { setH( h, minute(), second() ); }
/**Sets integer minutes portion of angle, leaving the hours and
*seconds values intact.
*@param m new integer minutes value
*@sa setArcMin()
*/
void setHMin( const int &m ) { setH( hour(), m, second() ); }
/**Sets integer seconds portion of angle, leaving the hours and
*minutes values intact.
*@param s new integer seconds value
*@sa setArcSec()
*/
void setHSec( const int &s ) { setH( hour(), minute(), s ); }
/**@short Sets floating-point value of angle, in hours.
*
*Converts argument from hours to degrees, then
*sets floating-point value of angle, in degrees.
*@param x new angle, in hours (double)
*@sa setD()
*/
void setH( const double &x );
/**@short Sets floating-point value of angle, in hours.
*
*Converts argument values from hours to degrees, then
*sets floating-point value of angle, in degrees.
*This is an overloaded member function, provided for convenience. It
*behaves essentially like the above function.
*@param h integer hours portion of angle
*@param m integer minutes portion of angle
*@param s integer seconds portion of angle
*@param ms integer milliseconds portion of angle
*@sa setD()
*/
void setH( const int &h, const int &m, const int &s, const int &ms=0 );
/**@short Copy value of another dms angle
*@param d set angle according to this dms object
*/
void set( const dms &d ) { setD( d.Degrees() ); }
/**Copy value of another dms angle. Differs from above function only
*in argument type. Identical to setD(double d).
*@param d set angle according to this double value
*@sa setD()
*/
void set( const double &d ) { setD( d ); }
/**@short Attempt to parse the string argument as a dms value, and set the dms object
*accordingly.
*@param s the string to be parsed as a dms value. The string can be an int or
*floating-point value, or a triplet of values (d/h, m, s) separated by spaces or colons.
*@param isDeg if true, the value is in degrees. Otherwise, it is in hours.
*@return true if sting was parsed successfully. Otherwise, set the dms value
*to 0.0 and return false.
*/
bool setFromString( const TQString &s, bool isDeg=true );
/**
*Addition operator. Add two dms objects.
*@param d add to current angle
*@return sum of two angles, in a dms object
*/
// dms operator+ ( dms d );
/**
*Subtraction operator. Subtract two dms objects.
*@param d subtract from current angle
*@return difference of two angles, in a dms object
*/
// dms operator- ( dms d );
/**
*Assignment operator. Assign value of argument to current angle.
*I wanted to pass the argument by reference, but I couldn't figure
*out a good way to do it without generating an error or warning message.
*@param a dms object to get angle value from
*@return dms object, copy of argument.
*/
// dms operator= ( const dms a ) { return a; }
/**
*Assignment operator. Assign value of argument to current angle.
*@param d floating-point number to get angle value from
*@return dms object, same value as argument.
*/
// dms operator= ( const double &d ) { return (dms( d )); }
/**@short Compute Sine and Cosine of the angle simultaneously.
*On machines using glibc >= 2.1, calling SinCos() is somewhat faster
*than calling sin() and cos() separately.
*The values are returned through the arguments (passed by reference).
*The Sin and Cos values are stored internally; on subsequent calls
*to SinCos(), the stored values are returned directly (unless the
*angle's value has changed).
*@param s Sine of the angle
*@param c Cosine of the angle
*@sa sin() cos()
*/
void SinCos( double &s, double &c ) const;
/**@short Compute the Angle's Sine.
*
*If the Sine/Cosine values have already been computed, then this
*function simply returns the stored value. Otherwise, it will compute
*and store the values first.
*@return the Sine of the angle.
*@sa cos()
*/
const double& sin( void ) const;
/**@short Compute the Angle's Cosine.
*
*If the Sine/Cosine values have already been computed, then this
*function simply returns the stored value. Otherwise, it will compute
*and store the values first.
*@return the Cosine of the angle.
*@sa sin()
*/
const double& cos( void ) const;
/**@short Express the angle in radians.
*The computed Radians value is stored internally. On subsequent calls,
*the stored value is returned directly (unless the angle's value has
*changed).
*@return the angle in radians (double)
*/
const double& radians( void ) const;
/**@short Set angle according to the argument, in radians.
*
*This function converts the argument to degrees, then sets the angle
*with setD().
*@param a angle in radians
*/
void setRadians( const double &a );
/**return the equivalent angle between 0 and 360 degrees.
*@warning does not change the value of the parent angle itself.
*/
const dms reduce( void ) const;
/**@return a nicely-formatted string representation of the angle
*in degrees, arcminutes, and arcseconds.
*/
const TQString toDMSString(const bool forceSign = false) const;
/**@return a nicely-formatted string representation of the angle
*in hours, minutes, and seconds.
*/
const TQString toHMSString() const;
/**PI is a const static member; it's public so that it can be used anywhere,
*as long as dms.h is included.
*/
static const double PI;
/**DegToRad is a const static member equal to the number of radians in
*one degree (dms::PI/180.0).
*/
static const double DegToRad;
/**@short Static function to create a DMS object from a TQString.
*
*There are several ways to specify the angle:
*@li Integer numbers ( 5 or -33 )
*@li Floating-point numbers ( 5.0 or -33.0 )
*@li colon-delimited integers ( 5:0:0 or -33:0:0 )
*@li colon-delimited with float seconds ( 5:0:0.0 or -33:0:0.0 )
*@li colon-delimited with float minutes ( 5:0.0 or -33:0.0 )
*@li space-delimited ( 5 0 0; -33 0 0 ) or ( 5 0.0 or -33 0.0 )
*@li space-delimited, with unit labels ( 5h 0m 0s or -33d 0m 0s )
*@param s the string to be parsed as an angle value
*@param deg if TRUE, s is expressed in degrees; if FALSE, s is expressed in hours
*@return a dms object whose value is parsed from the string argument
*/
static dms fromString(TQString & s, bool deg);
private:
double D;
mutable double Radians;
mutable double Sin, Cos;
mutable bool scDirty, rDirty;
};
#endif