+ const Timestamp whole_seconds = floor(abs(t));
+ const Timestamp days = floor(whole_seconds / (60 * 60 * 24));
+ const unsigned int hours = fmod(whole_seconds / (60 * 60), 24).convert_to<uint>();
+ const unsigned int minutes = fmod(whole_seconds / 60, 60).convert_to<uint>();
+ const unsigned int seconds = fmod(whole_seconds, 60).convert_to<uint>();
+
+ QString s;
+ QTextStream ts(&s);
+
+ if (t >= 0)
+ ts << "+";
+ else
+ ts << "-";
+
+ bool use_padding = false;
+
+ if (days) {
+ ts << days.str().c_str() << ":";
+ use_padding = true;
+ }
+
+ if (hours || days) {
+ ts << pad_number(hours, use_padding ? 2 : 0) << ":";
+ use_padding = true;
+ }
+
+ if (minutes || hours || days) {
+ ts << pad_number(minutes, use_padding ? 2 : 0);
+ use_padding = true;
+
+ // We're not showing any seconds with a negative precision
+ if (precision >= 0)
+ ts << ":";
+ }
+
+ // precision < 0: Use DD:HH:MM format
+ // precision = 0: Use DD:HH:MM:SS format
+ // precision > 0: Use DD:HH:MM:SS.mmm nnn ppp fff format
+ if (precision >= 0) {
+ ts << pad_number(seconds, use_padding ? 2 : 0);
+
+ const Timestamp fraction = fabs(t) - whole_seconds;
+
+ if (precision > 0 && precision < 1000) {
+ std::ostringstream ss;
+ ss
+ << std::fixed
+ << std::setprecision(2 + precision)
+ << std::setfill('0')
+ << fraction;
+ std::string fs = ss.str();
+
+ ts << ".";
+
+ // Copy all digits, inserting spaces as unit separators
+ for (int i = 1; i <= precision; i++) {
+ // Start at index 2 to skip the "0." at the beginning
+ ts << fs[1 + i];
+
+ if ((i > 0) && (i % 3 == 0) && (i != precision))
+ ts << " ";
+ }
+ }
+ }
+
+ return s;
+}
+
+static QString format_time_with_si(const Timestamp& t, QString unit,
+ SIPrefix prefix, unsigned int precision)
+{
+ // The precision is always given without taking the prefix into account
+ // so we need to deduct the number of decimals the prefix might imply
+ const int prefix_order = -exponent(prefix);
+
+ const unsigned int relative_prec =
+ (prefix >= SIPrefix::none) ? precision :
+ std::max((int)(precision - prefix_order), 0);
+
+ return format_si_value(t, unit, prefix, relative_prec);
+}
+
+QString format_time(const Timestamp& t, SIPrefix prefix, TimeUnit unit,
+ unsigned int precision)
+{
+ // Make 0 appear as 0, not random +0 or -0
+ if (t.is_zero())
+ return "0";
+
+ // If we have to use samples then we have no alternative formats
+ if (unit == TimeUnit::Samples)
+ return format_time_with_si(t, "sa", prefix, precision);
+
+ // View in "normal" range -> medium precision, medium step size
+ // -> HH:MM:SS.mmm... or xxxx (si unit) if less than 60 seconds
+ // View zoomed way in -> high precision (>3), low step size (<1s)
+ // -> HH:MM:SS.mmm... or xxxx (si unit) if less than 60 seconds
+ if (abs(t) < 60)
+ return format_time_with_si(t, "s", prefix, precision);