2 * This file is part of the PulseView project.
4 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
27 #include <QTextStream>
35 static const QString SIPrefixes[17] =
36 {"y", "z", "a", "f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G",
37 "T", "P", "E", "Z", "Y"};
38 const int FirstSIPrefixPower = -24;
40 QString format_si_value(double v, QString unit, int prefix,
41 unsigned int precision, bool sign)
44 int exp = -FirstSIPrefixPower;
47 while ((fabs(v) * pow(10.0, exp)) > 999.0 &&
48 prefix < (int)(countof(SIPrefixes) - 1)) {
55 assert(prefix < (int)countof(SIPrefixes));
57 const double multiplier = pow(10.0,
58 (int)- prefix * 3 - FirstSIPrefixPower);
64 ts << fixed << qSetRealNumberPrecision(precision) <<
65 (v * multiplier) << " " << SIPrefixes[prefix] << unit;
70 QString format_time(double t, int prefix,
71 unsigned int precision, bool sign)
73 return format_si_value(t, "s", prefix, precision, sign);
76 QString format_second(double second)
78 return format_si_value(second, "s", -1, 0, false);