SquareGameLiberationFront/F.E.I.S
1
0
Fork 0
mirror of https://gitlab.com/square-game-liberation-front/F.E.I.S.git synced 2025-02-28 23:41:33 +01:00
Code Releases Wiki Activity

Fix fraction to decimal conversion function

Browse Source
This commit is contained in:
Stepland 2022-04-13 10:36:31 +02:00
parent 65388c8335
commit bed3817534
1 changed files with 7 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
src/special_numeric_types.cpp
View File

@ -192,29 +192,13 @@ Fraction floor_beats(Fraction beats, std::uint64_t denominator) {
};
Decimal convert_to_decimal(const Fraction& f, unsigned int decimal_places) {
const auto abs_f = f > 0 ? f : -1 * f;
std::int64_t precision = 0;
if (abs_f > 1) {
const std::int64_t numerator_digits = mpz_sizeinbase(f.numerator().get_mpz_t(), 10);
const std::int64_t denominator_digits = mpz_sizeinbase(f.denominator().get_mpz_t(), 10);
if (numerator_digits == denominator_digits) {
precision = decimal_places;
} else {
precision = numerator_digits - denominator_digits + decimal_places + 1;
}
const auto numerator = Decimal{f.numerator().get_str()};
const auto denominator = Decimal{f.denominator().get_str()};
const auto divided = numerator / denominator;
if (decimal_places == 0) {
return divided.to_integral();
} else {
const auto first_non_zero_place = -static_cast<std::int64_t>(std::log10(static_cast<double>(abs_f)));
if (decimal_places < first_non_zero_place) {
return Decimal{0};
} else {
precision = decimal_places - first_non_zero_place;
}
}
decimal::Context c{precision};
if (f < 0) {
return -1 * Decimal{convert_to_u64((-1 * f).numerator())}.div(convert_to_u64(f.denominator()), c);
} else {
return Decimal{convert_to_u64(f.numerator())}.div(convert_to_u64(f.denominator()), c);
const auto quantizer = Decimal{fmt::format("1.{:0{}}", 0, decimal_places)};
return divided.quantize(quantizer);
}
}