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1 | /* | |
2 | * This file is part of the PulseView project. | |
3 | * | |
4 | * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk> | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | */ | |
20 | ||
21 | #include "util.h" | |
22 | ||
23 | #include <extdef.h> | |
24 | ||
25 | #include <assert.h> | |
26 | ||
27 | #include <QTextStream> | |
28 | #include <QDebug> | |
29 | ||
30 | using namespace Qt; | |
31 | ||
32 | namespace pv { | |
33 | namespace util { | |
34 | ||
35 | static const QString SIPrefixes[9] = | |
36 | {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"}; | |
37 | const int FirstSIPrefixPower = -15; | |
38 | ||
39 | QString format_time(double t, unsigned int prefix, | |
40 | unsigned int precision, bool sign) | |
41 | { | |
42 | assert(prefix < countof(SIPrefixes)); | |
43 | ||
44 | const double multiplier = pow(10.0, | |
45 | (int)- prefix * 3 - FirstSIPrefixPower); | |
46 | ||
47 | QString s; | |
48 | QTextStream ts(&s); | |
49 | if (sign) { | |
50 | ts << forcesign; | |
51 | } | |
52 | ts << fixed << qSetRealNumberPrecision(precision) | |
53 | << (t * multiplier) << SIPrefixes[prefix] << "s"; | |
54 | ||
55 | return s; | |
56 | } | |
57 | ||
58 | QString format_second(double second) | |
59 | { | |
60 | unsigned int i = 0; | |
61 | int exp = - FirstSIPrefixPower; | |
62 | ||
63 | while ((second * pow(10.0, exp)) > 999.0 && i < countof(SIPrefixes) - 1) { | |
64 | i++; | |
65 | exp -= 3; | |
66 | } | |
67 | ||
68 | return format_time(second, i, 0, false); | |
69 | } | |
70 | ||
71 | } // namespace util | |
72 | } // namespace pv |