Util: Fix issue where t=0 randomly shows up as +0 or -0

diff --git a/pv/util.cpp b/pv/util.cpp
index 6772b040defddb3660e4cb46d52019a737f1456e..133317e0b9d98b0b074d688f9919da3ce5f65df0 100644 (file)
--- a/pv/util.cpp
+++ b/pv/util.cpp
@@ -39,6 +39,7 @@ static const QString SIPrefixes[17] =
        "T", "P", "E", "Z", "Y"};
 const int FirstSIPrefix = 8;
 const int FirstSIPrefixPower = -(FirstSIPrefix * 3);
+const double MinTimeDelta = 1e-15; // Anything below 1 fs can be considered zero
 
 QString format_si_value(double v, QString unit, int prefix,
        unsigned int precision, bool sign)
@@ -158,6 +159,10 @@ static QString format_time_with_si(double t, QString unit, int prefix,
 QString format_time(double t, int prefix, TimeUnit unit,
        unsigned int precision, double step_size, bool sign)
 {
+       // Make 0 appear as 0, not random +0 or -0
+       if (fabs(t) < MinTimeDelta)
+               return "0";
+
        // If we have to use samples then we have no alternative formats
        if (unit == Samples)
                return format_time_with_si(t, "sa", prefix, precision, sign);