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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 <algorithm> | |
28 | #include <sstream> | |
29 | ||
30 | #include <QTextStream> | |
31 | #include <QDebug> | |
32 | ||
33 | using namespace Qt; | |
34 | ||
35 | namespace pv { | |
36 | namespace util { | |
37 | ||
38 | static QTextStream& operator<<(QTextStream& stream, SIPrefix prefix) | |
39 | { | |
40 | switch (prefix) { | |
41 | case SIPrefix::yocto: return stream << 'y'; | |
42 | case SIPrefix::zepto: return stream << 'z'; | |
43 | case SIPrefix::atto: return stream << 'a'; | |
44 | case SIPrefix::femto: return stream << 'f'; | |
45 | case SIPrefix::pico: return stream << 'p'; | |
46 | case SIPrefix::nano: return stream << 'n'; | |
47 | case SIPrefix::micro: return stream << QChar(0x03BC); | |
48 | case SIPrefix::milli: return stream << 'm'; | |
49 | case SIPrefix::kilo: return stream << 'k'; | |
50 | case SIPrefix::mega: return stream << 'M'; | |
51 | case SIPrefix::giga: return stream << 'G'; | |
52 | case SIPrefix::tera: return stream << 'T'; | |
53 | case SIPrefix::peta: return stream << 'P'; | |
54 | case SIPrefix::exa: return stream << 'E'; | |
55 | case SIPrefix::zetta: return stream << 'Z'; | |
56 | case SIPrefix::yotta: return stream << 'Y'; | |
57 | ||
58 | default: return stream; | |
59 | } | |
60 | } | |
61 | ||
62 | int exponent(SIPrefix prefix) | |
63 | { | |
64 | return 3 * (static_cast<int>(prefix) - static_cast<int>(SIPrefix::none)); | |
65 | } | |
66 | ||
67 | static SIPrefix successor(SIPrefix prefix) | |
68 | { | |
69 | assert(prefix != SIPrefix::yotta); | |
70 | return static_cast<SIPrefix>(static_cast<int>(prefix) + 1); | |
71 | } | |
72 | ||
73 | // Insert the timestamp value into the stream in fixed-point notation | |
74 | // (and honor the precision) | |
75 | static QTextStream& operator<<(QTextStream& stream, const Timestamp& t) | |
76 | { | |
77 | // The multiprecision types already have a function and a stream insertion | |
78 | // operator to convert them to a string, however these functions abuse a | |
79 | // precision value of zero to print all available decimal places instead of | |
80 | // none, and the boost authors refuse to fix this because they don't want | |
81 | // to break buggy code that relies on this bug. | |
82 | // (https://svn.boost.org/trac/boost/ticket/10103) | |
83 | // Therefore we have to work around the case where precision is zero. | |
84 | ||
85 | int precision = stream.realNumberPrecision(); | |
86 | ||
87 | std::ostringstream ss; | |
88 | ss << std::fixed; | |
89 | ||
90 | if (stream.numberFlags() & QTextStream::ForceSign) | |
91 | ss << std::showpos; | |
92 | ||
93 | if (0 == precision) | |
94 | ss << std::setprecision(1) << round(t); | |
95 | else | |
96 | ss << std::setprecision(precision) << t; | |
97 | ||
98 | std::string str(ss.str()); | |
99 | if (0 == precision) { | |
100 | // remove the separator and the unwanted decimal place | |
101 | str.resize(str.size() - 2); | |
102 | } | |
103 | ||
104 | return stream << QString::fromStdString(str); | |
105 | } | |
106 | ||
107 | QString format_time_si( | |
108 | const Timestamp& v, | |
109 | SIPrefix prefix, | |
110 | unsigned int precision, | |
111 | QString unit, | |
112 | bool sign) | |
113 | { | |
114 | if (prefix == SIPrefix::unspecified) { | |
115 | // No prefix given, calculate it | |
116 | ||
117 | if (v.is_zero()) { | |
118 | prefix = SIPrefix::none; | |
119 | } else { | |
120 | int exp = exponent(SIPrefix::yotta); | |
121 | prefix = SIPrefix::yocto; | |
122 | while ((fabs(v) * pow(Timestamp(10), exp)) > 999 && | |
123 | prefix < SIPrefix::yotta) { | |
124 | prefix = successor(prefix); | |
125 | exp -= 3; | |
126 | } | |
127 | } | |
128 | } | |
129 | ||
130 | assert(prefix >= SIPrefix::yocto); | |
131 | assert(prefix <= SIPrefix::yotta); | |
132 | ||
133 | const Timestamp multiplier = pow(Timestamp(10), -exponent(prefix)); | |
134 | ||
135 | QString s; | |
136 | QTextStream ts(&s); | |
137 | if (sign && !v.is_zero()) | |
138 | ts << forcesign; | |
139 | ts | |
140 | << qSetRealNumberPrecision(precision) | |
141 | << (v * multiplier) | |
142 | << ' ' | |
143 | << prefix | |
144 | << unit; | |
145 | ||
146 | return s; | |
147 | } | |
148 | ||
149 | QString format_time_si_adjusted( | |
150 | const Timestamp& t, | |
151 | SIPrefix prefix, | |
152 | unsigned precision, | |
153 | QString unit, | |
154 | bool sign) | |
155 | { | |
156 | // The precision is always given without taking the prefix into account | |
157 | // so we need to deduct the number of decimals the prefix might imply | |
158 | const int prefix_order = -exponent(prefix); | |
159 | ||
160 | const unsigned int relative_prec = | |
161 | (prefix >= SIPrefix::none) ? precision : | |
162 | std::max((int)(precision - prefix_order), 0); | |
163 | ||
164 | return format_time_si(t, prefix, relative_prec, unit, sign); | |
165 | } | |
166 | ||
167 | ||
168 | // Helper for 'format_time_minutes()'. | |
169 | static QString pad_number(unsigned int number, int length) | |
170 | { | |
171 | return QString("%1").arg(number, length, 10, QChar('0')); | |
172 | } | |
173 | ||
174 | QString format_time_minutes(const Timestamp& t, signed precision, bool sign) | |
175 | { | |
176 | const Timestamp whole_seconds = floor(abs(t)); | |
177 | const Timestamp days = floor(whole_seconds / (60 * 60 * 24)); | |
178 | const unsigned int hours = fmod(whole_seconds / (60 * 60), 24).convert_to<uint>(); | |
179 | const unsigned int minutes = fmod(whole_seconds / 60, 60).convert_to<uint>(); | |
180 | const unsigned int seconds = fmod(whole_seconds, 60).convert_to<uint>(); | |
181 | ||
182 | QString s; | |
183 | QTextStream ts(&s); | |
184 | ||
185 | if (t < 0) | |
186 | ts << "-"; | |
187 | else if (sign) | |
188 | ts << "+"; | |
189 | ||
190 | bool use_padding = false; | |
191 | ||
192 | // DD | |
193 | if (days) { | |
194 | ts << days.str().c_str() << ":"; | |
195 | use_padding = true; | |
196 | } | |
197 | ||
198 | // HH | |
199 | if (hours || days) { | |
200 | ts << pad_number(hours, use_padding ? 2 : 0) << ":"; | |
201 | use_padding = true; | |
202 | } | |
203 | ||
204 | // MM | |
205 | ts << pad_number(minutes, use_padding ? 2 : 0); | |
206 | ||
207 | ts << ":"; | |
208 | ||
209 | // SS | |
210 | ts << pad_number(seconds, 2); | |
211 | ||
212 | if (precision) { | |
213 | ts << "."; | |
214 | ||
215 | const Timestamp fraction = fabs(t) - whole_seconds; | |
216 | ||
217 | std::ostringstream ss; | |
218 | ss | |
219 | << std::fixed | |
220 | << std::setprecision(precision) | |
221 | << std::setfill('0') | |
222 | << fraction; | |
223 | std::string fs = ss.str(); | |
224 | ||
225 | // Copy all digits, inserting spaces as unit separators | |
226 | for (int i = 1; i <= precision; i++) { | |
227 | // Start at index 2 to skip the "0." at the beginning | |
228 | ts << fs.at(1 + i); | |
229 | ||
230 | if ((i > 0) && (i % 3 == 0) && (i != precision)) | |
231 | ts << " "; | |
232 | } | |
233 | } | |
234 | ||
235 | return s; | |
236 | } | |
237 | ||
238 | } // namespace util | |
239 | } // namespace pv |