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#ifndef ANGLE_H
#define ANGLE_H
#include <string>
#include <sstream>
#include <stdexcept>
#include <cmath>
#include <boost/algorithm/string/case_conv.hpp>
class Angle
{
public:
enum Unit { Radians, Degrees, Arcminutes, Arcseconds, Milliarcseconds };
/**
* Parse the string as an angle, possibly with unit specification, and return in radians.
* @return The angle
*/
static double Parse(const std::string& s, const std::string& valueDescription, Unit defaultUnit);
static std::string ToNiceString(double angleRad);
private:
static size_t findNumberEnd(const std::string& s);
static bool isDigit(const char c) { return c>='0' && c<='9'; }
static bool isWhitespace(const char c) { return c==' ' || c=='\t'; }
};
inline std::string Angle::ToNiceString(double angleRad)
{
std::ostringstream str;
double degAngle = angleRad * 180.0 / M_PI;
if(degAngle >= 2.0)
{
str << round(degAngle*100.0)/100.0 << " deg";
}
else {
double minAngle = angleRad * 180.0 * 60.0 / M_PI;
if(minAngle >= 2.0)
{
str << round(minAngle*100.0)/100.0 << "'";
}
else {
double secAngle = angleRad * 180.0 * 60.0 * 60.0 / M_PI;
if(secAngle >= 1.0)
{
str << round(secAngle*100.0)/100.0 << "''";
}
else {
str << round (secAngle*100.0*1000.0)/100.0 << " masec";
}
}
}
return str.str();
}
inline double Angle::Parse(const std::string& s, const std::string& valueDescription, Unit defaultUnit)
{
size_t end = findNumberEnd(s);
if(end == 0)
throw std::runtime_error("Error parsing " + valueDescription);
std::string number = s.substr(0, end);
double val = atof(number.c_str());
// Skip whitespace after number
const char *c = s.c_str();
while(isWhitespace(c[end]))
++end;
std::string unitStr = std::string(&c[end]);
boost::to_lower(unitStr);
// Unit string empty? Than use default unit.
if(unitStr.empty())
{
switch(defaultUnit)
{
case Radians:
return val;
case Degrees:
return val * M_PI/180.0;
case Arcminutes:
return val * M_PI/(180.0*60.0);
case Arcseconds:
return val * M_PI/(180.0*60.0*60.0);
case Milliarcseconds:
return val * M_PI/(180.0*60.0*60.0*1000.0);
}
}
// In degrees?
else if(unitStr=="deg" || unitStr=="degrees")
return val * M_PI/180.0;
// In arcmin?
else if(unitStr.empty() || unitStr=="amin" || unitStr=="arcmin" || unitStr=="\'")
return val * M_PI/(180.0*60.0);
// In arcsec?
else if(unitStr.empty() || unitStr=="asec" || unitStr=="arcsec" || unitStr=="\'\'")
return val * M_PI/(180.0*60.0*60.0);
// In marcsec?
else if(unitStr.empty() || unitStr=="masec" || unitStr=="marcsec")
return val * M_PI/(180.0*60.0*60.0*1000.0);
// In radians
else if(unitStr.empty() || unitStr=="rad" || unitStr=="radians")
return val;
throw std::runtime_error("Invalid unit specification in angle given for " + valueDescription);
}
inline size_t Angle::findNumberEnd(const std::string& s)
{
const char* c = s.c_str();
size_t pos = 0;
while(isWhitespace(c[pos]))
++pos;
while(isDigit(c[pos]))
++pos;
if(c[pos]=='.')
++pos;
while(isDigit(c[pos]))
++pos;
if(c[pos]=='e' || c[pos]=='E')
{
++pos;
if(c[pos]=='-' || c[pos]=='+')
++pos;
while(isDigit(c[pos]))
++pos;
}
return pos;
}
#endif
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