return stream << QString::fromStdString(str);
}
-QString format_time_si(const Timestamp& v, SIPrefix prefix,
- unsigned int precision, QString unit, bool sign)
+SIPrefix determine_value_prefix(double v)
{
- if (prefix == SIPrefix::unspecified) {
- // No prefix given, calculate it
-
- if (v.is_zero()) {
- prefix = SIPrefix::none;
- } else {
- int exp = exponent(SIPrefix::yotta);
- prefix = SIPrefix::yocto;
- while ((fabs(v) * pow(Timestamp(10), exp)) > 999 &&
- prefix < SIPrefix::yotta) {
- prefix = successor(prefix);
- exp -= 3;
- }
+ SIPrefix prefix;
+
+ if (v == 0) {
+ prefix = SIPrefix::none;
+ } else {
+ int exp = exponent(SIPrefix::yotta);
+ prefix = SIPrefix::yocto;
+ while ((fabs(v) * pow(10, exp)) > 999 &&
+ prefix < SIPrefix::yotta) {
+ prefix = successor(prefix);
+ exp -= 3;
}
}
+ return prefix;
+}
+
+QString format_time_si(const Timestamp& v, SIPrefix prefix,
+ unsigned int precision, QString unit, bool sign)
+{
+ if (prefix == SIPrefix::unspecified)
+ prefix = determine_value_prefix(v.convert_to<double>());
+
assert(prefix >= SIPrefix::yocto);
assert(prefix <= SIPrefix::yotta);
QString s;
QTextStream ts(&s);
if (sign && !v.is_zero())
- ts << forcesign;
- ts << qSetRealNumberPrecision(precision) << (v * multiplier) << ' '
- << prefix << unit;
+ ts.setNumberFlags(ts.numberFlags() | QTextStream::ForceSign);
+ ts << qSetRealNumberPrecision(precision) << (v * multiplier);
+ ts << ' ' << prefix << unit;
+
+ return s;
+}
+
+QString format_value_si(double v, SIPrefix prefix, unsigned precision,
+ QString unit, bool sign)
+{
+ if (prefix == SIPrefix::unspecified) {
+ prefix = determine_value_prefix(v);
+
+ const int prefix_order = -exponent(prefix);
+ precision = (prefix >= SIPrefix::none) ? max((int)(precision + prefix_order), 0) :
+ max((int)(precision - prefix_order), 0);
+ }
+
+ assert(prefix >= SIPrefix::yocto);
+ assert(prefix <= SIPrefix::yotta);
+
+ const double multiplier = pow(10.0, -exponent(prefix));
+
+ QString s;
+ QTextStream ts(&s);
+ if (sign && (v != 0))
+ ts.setNumberFlags(ts.numberFlags() | QTextStream::ForceSign);
+ ts.setRealNumberNotation(QTextStream::FixedNotation);
+ ts.setRealNumberPrecision(precision);
+ ts << (v * multiplier) << ' ' << prefix << unit;
return s;
}
}
/**
- * Split a string into tokens at occurances of the separator.
+ * Split a string into tokens at occurences of the separator.
*
- * @param[in] text the input string to split
- * @param[in] separator the delimiter between tokens
+ * @param[in] text The input string to split.
+ * @param[in] separator The delimiter between tokens.
*
- * @return a vector of broken down tokens
+ * @return A vector of broken down tokens.
*/
vector<string> split_string(string text, string separator)
{
return result;
}
+/**
+ * Return the width of a string in a given font.
+ *
+ * @param[in] metric metrics of the font
+ * @param[in] string the string whose width should be determined
+ *
+ * @return width of the string in pixels
+ */
+std::streamsize text_width(const QFontMetrics &metric, const QString &string)
+{
+#if QT_VERSION >= QT_VERSION_CHECK(5, 11, 0)
+ return metric.horizontalAdvance(string);
+#else
+ return metric.width(string);
+#endif
+}
+
} // namespace util
} // namespace pv