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Fix float data conversion to string

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Fixes precision digits, closing #430
Also avoids forcing a trailing '.0', closing #1627
This commit is contained in:
Sandro Santilli 2012-12-06 11:59:28 +01:00
parent 3d7575c282
commit 19522ac509
1 changed files with 6 additions and 2 deletions
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8
include/mapnik/util/conversions.hpp
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@ -68,7 +68,11 @@ struct double_policy : boost::spirit::karma::real_policies<T>
{
typedef boost::spirit::karma::real_policies<T> base_type;
static int floatfield(T n) { return base_type::fmtflags::fixed; }
static unsigned precision(T n) { return 16 ;}
static unsigned precision(T n) { return 15 - trunc(log10(n)); }
template <typename OutputIterator>
static bool dot(OutputIterator& sink, T n, unsigned precision) {
return n ? *sink = '.', true : false;
}
};
@ -77,7 +81,7 @@ template <>
inline bool to_string(std::string & str, double value)
{
namespace karma = boost::spirit::karma;
typedef boost::spirit::karma::real_generator<double, double_policy<double> > double_type;
typedef karma::real_generator<double, double_policy<double> > double_type;
std::back_insert_iterator<std::string> sink(str);
return karma::generate(sink, double_type(), value);
}