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Nasal Math: add precision to floor(), add trunc()

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To simplify various rounding / truncation operations, especially when
dealing with frequency values, give floor() the same precision control
already present in math.round(), and add math.trunc() which always 
truncates towards zero.
This commit is contained in:
James Turner
2021-11-16 10:59:01 +00:00
parent ddea2de3a0
commit 6562546771
1 changed files with 15 additions and 1 deletions
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16
simgear/nasal/mathlib.c
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@@ -88,7 +88,20 @@ static naRef f_floor(naContext c, naRef me, int argc, naRef* args)
naRef a = naNumValue(argc > 0 ? args[0] : naNil());
if(naIsNil(a))
naRuntimeError(c, "non numeric argument to floor()");
a.num = floor(a.num);
naRef b = naNumValue(argc > 1 ? args[1] : naNil());
double divisor = naIsNil(b) ? 1.0 : b.num;
a.num = floor(a.num / divisor) * divisor;
return VALIDATE(a);
}
static naRef f_trunc(naContext c, naRef me, int argc, naRef* args)
{
naRef a = naNumValue(argc > 0 ? args[0] : naNil());
if (naIsNil(a))
naRuntimeError(c, "non numeric argument to trunv()");
naRef b = naNumValue(argc > 1 ? args[1] : naNil());
double divisor = naIsNil(b) ? 1.0 : b.num;
a.num = trunc(a.num / divisor) * divisor;
return VALIDATE(a);
}
@@ -221,6 +234,7 @@ static naCFuncItem funcs[] = {
{ "atan", f_atan },
{ "floor", f_floor },
{ "ceil", f_ceil },
{ "trunc", f_trunc },
{ "fmod", f_fmod },
{ "clamp", f_clamp },
{ "periodic", f_periodic },