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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.hpp" | |
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[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; | |
39 | ||
40 | QString format_si_value(double v, QString unit, int prefix, | |
41 | unsigned int precision, bool sign) | |
42 | { | |
43 | if (prefix < 0) { | |
44 | int exp = -FirstSIPrefixPower; | |
45 | ||
46 | prefix = 0; | |
47 | while ((fabs(v) * pow(10.0, exp)) > 999.0 && | |
48 | prefix < (int)(countof(SIPrefixes) - 1)) { | |
49 | prefix++; | |
50 | exp -= 3; | |
51 | } | |
52 | } | |
53 | ||
54 | assert(prefix >= 0); | |
55 | assert(prefix < (int)countof(SIPrefixes)); | |
56 | ||
57 | const double multiplier = pow(10.0, | |
58 | (int)- prefix * 3 - FirstSIPrefixPower); | |
59 | ||
60 | QString s; | |
61 | QTextStream ts(&s); | |
62 | if (sign) | |
63 | ts << forcesign; | |
64 | ts << fixed << qSetRealNumberPrecision(precision) << | |
65 | (v * multiplier) << " " << SIPrefixes[prefix] << unit; | |
66 | ||
67 | return s; | |
68 | } | |
69 | ||
70 | QString format_time(double t, int prefix, | |
71 | unsigned int precision, bool sign) | |
72 | { | |
73 | return format_si_value(t, "s", prefix, precision, sign); | |
74 | } | |
75 | ||
76 | QString format_second(double second) | |
77 | { | |
78 | return format_si_value(second, "s", -1, 0, false); | |
79 | } | |
80 | ||
81 | } // namespace util | |
82 | } // namespace pv |