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radeccoord.h
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radeccoord.h
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#ifndef RADECCOORD_H
#define RADECCOORD_H
#include <string>
#include <sstream>
#include <stdexcept>
#include <cstdlib>
#include <cmath>
class RaDecCoord
{
public:
static long double ParseRA(const std::string &str)
{
char *cstr;
bool sign = false;
for(size_t i=0; i!=str.size(); ++i)
{
if(str[i] == '-')
{
sign = true;
break;
} else if(str[i] != ' ')
{
sign = false;
break;
}
}
long double secs=0.0, mins=0.0,
hrs = strtol(str.c_str(), &cstr, 10);
// Parse format '00h00m00.0s'
if(*cstr == 'h')
{
++cstr;
mins = strtol(cstr, &cstr, 10);
if(*cstr == 'm')
{
++cstr;
secs = strtold(cstr, &cstr);
if(*cstr == 's')
++cstr;
else throw std::runtime_error("Missing 's'");
} else throw std::runtime_error("Missing 'm'");
}
// Parse format '00:00:00.0'
else if(*cstr == ':')
{
++cstr;
mins = strtol(cstr, &cstr, 10);
if(*cstr == ':')
{
++cstr;
secs = strtold(cstr, &cstr);
} else throw std::runtime_error("Missing ':' after minutes");
}
else throw std::runtime_error("Missing 'h' or ':'");
if(*cstr != 0)
throw std::runtime_error("Could not parse RA (string contains more tokens than expected)");
if(sign)
return (hrs/24.0 - mins/(24.0*60.0) - secs/(24.0*60.0*60.0))*2.0*M_PI;
else
return (hrs/24.0 + mins/(24.0*60.0) + secs/(24.0*60.0*60.0))*2.0*M_PI;
}
static long double ParseDec(const std::string &str)
{
char *cstr;
bool sign = false;
for(size_t i=0; i!=str.size(); ++i)
{
if(str[i] == '-')
{
sign = true;
break;
} else if(str[i] != ' ')
{
sign = false;
break;
}
}
long double secs=0.0, mins=0.0,
degs = strtol(str.c_str(), &cstr, 10);
// Parse format '00d00m00.0s'
if(*cstr == 'd')
{
++cstr;
mins = strtol(cstr, &cstr, 10);
if(*cstr == 'm')
{
++cstr;
secs = strtold(cstr, &cstr);
if(*cstr == 's')
++cstr;
else throw std::runtime_error("Missing 's'");
} else throw std::runtime_error("Missing 'm'");
}
// Parse format '00.00.00.0'
else if(*cstr == '.')
{
++cstr;
mins = strtol(cstr, &cstr, 10);
if(*cstr == '.')
{
++cstr;
secs = strtold(cstr, &cstr);
} else throw std::runtime_error("Missing '.' after minutes");
}
else throw std::runtime_error("Missing 'd' or '.' after degrees");
if(*cstr != 0)
throw std::runtime_error("Could not parse Dec (string contains more tokens than expected)");
else if(sign)
return (degs/360.0 - mins/(360.0*60.0) - secs/(360.0*60.0*60.0))*2.0*M_PI;
else
return (degs/360.0 + mins/(360.0*60.0) + secs/(360.0*60.0*60.0))*2.0*M_PI;
}
static std::string RAToString(long double ra)
{
long double hrs = ra * (12.0L / M_PIl);
hrs = round(hrs * 60.0L*60.0L*10.0L)/(60.0L*60.0L*10.0L);
std::stringstream s;
if(hrs < 0) {
hrs = -hrs;
s << '-';
}
hrs = ((round(hrs*60.0L*60.0L*10.0L))+0.5) / (60.0L*60.0L*10.0L);
int hrsInt = int(floor(hrs)), minInt = int(floor(fmod(hrs,1.0L)*60.0L)),
secInt = int(floor(fmod(hrs*60.0L,1.0L)*(60.0L))),
subSecInt = int(floor(fmod(hrs*(60.0L*60.0L),1.0L)*(10.0L)));
s << (char) ((hrsInt/10)+'0') << (char) ((hrsInt%10)+'0') << 'h'
<< (char) ((minInt/10)+'0') << (char) ((minInt%10)+'0') << 'm'
<< (char) ((secInt/10)+'0') << (char) ((secInt%10)+'0')
<< '.' << (char) (subSecInt+'0') << 's';
return s.str();
}
static std::string DecToString(long double dec)
{
long double deg = dec * (180.0 / M_PI);
deg = round(deg * 60.0*60.0)/(60.0*60.0);
std::stringstream s;
if(deg < 0) {
deg = -deg;
s << '-';
}
deg = (round(deg*60.0L*60.0L)+0.5) / (60.0L*60.0L);
int degInt = int(floor(deg)), minInt = int(floor(fmod(deg,1.0)*60.0)),
secInt = int(floor(fmod(deg,1.0/60.0)*(60.0*60.0)));
s << (char) ((degInt/10)+'0') << (char) ((degInt%10)+'0') << 'd'
<< (char) ((minInt/10)+'0') << (char) ((minInt%10)+'0') << 'm'
<< (char) ((secInt/10)+'0') << (char) ((secInt%10)+'0') << 's';
return s.str();
}
private:
RaDecCoord() { }
};
#endif