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Use 15 significant digits for float to string conversion

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Fixes printing of numbers like 67.65 or 67.35. Closes #1811
This commit is contained in:
Sandro Santilli 2013-04-17 11:00:27 +02:00
parent bb0133e929
commit c930807b9f
2 changed files with 12 additions and 4 deletions
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2
include/mapnik/util/conversions.hpp
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@ -83,7 +83,7 @@ struct double_policy : boost::spirit::karma::real_policies<T>
static unsigned precision(T n) {
if ( n == 0.0 ) return 0;
using namespace boost::spirit; // for traits
return static_cast<unsigned>(15 - boost::math::trunc(log10(traits::get_absolute_value(n))));
return static_cast<unsigned>(14 - boost::math::trunc(log10(traits::get_absolute_value(n))));
}
template <typename OutputIterator>

14
tests/cpp_tests/conversions_test.cpp
View file

@ -82,14 +82,22 @@ int main( int, char*[] )
BOOST_TEST_EQ( out, "-1000000000000000" );
out.clear();
to_string(out, double(100000000000000.1));
BOOST_TEST_EQ( out, "100000000000000.1" );
to_string(out, double(10000000000000.1));
BOOST_TEST_EQ( out, "10000000000000.1" );
out.clear();
to_string(out, double(1.00001));
BOOST_TEST_EQ( out, "1.00001" );
out.clear();
to_string(out, double(67.65));
BOOST_TEST_EQ( out, "67.65" );
out.clear();
to_string(out, double(67.35));
BOOST_TEST_EQ( out, "67.35" );
out.clear();
to_string(out, double(1234000000000000));
BOOST_TEST_EQ( out, "1234000000000000" );
out.clear();