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
30 #include <QTextStream>
38 static const QString SIPrefixes[17] = {
41 "n", QChar(0x03BC), "m",
46 const int EmptySIPrefix = 8;
47 const int FirstSIPrefixPower = -(EmptySIPrefix * 3);
49 // Insert the timestamp value into the stream in fixed-point notation
50 // (and honor the precision)
51 static QTextStream& operator<<(QTextStream& stream, const Timestamp& t)
53 // The multiprecision types already have a function and a stream insertion
54 // operator to convert them to a string, however these functions abuse a
55 // precision value of zero to print all available decimal places instead of
56 // none, and the boost authors refuse to fix this because they don't want
57 // to break buggy code that relies on this bug.
58 // (https://svn.boost.org/trac/boost/ticket/10103)
59 // Therefore we have to work around the case where precision is zero.
61 int precision = stream.realNumberPrecision();
63 std::ostringstream ss;
66 if (stream.numberFlags() & QTextStream::ForceSign) {
72 << std::setprecision(1)
76 << std::setprecision(precision)
80 std::string str(ss.str());
82 // remove the separator and the unwanted decimal place
83 str.resize(str.size() - 2);
86 return stream << QString::fromStdString(str);
89 QString format_si_value(const Timestamp& v, QString unit, int prefix,
90 unsigned int precision, bool sign)
93 // No prefix given, calculate it
96 prefix = EmptySIPrefix;
98 int exp = -FirstSIPrefixPower;
101 while ((fabs(v) * pow(10.0, exp)) > 999.0 &&
102 prefix < (int)(countof(SIPrefixes) - 1)) {
110 assert(prefix < (int)countof(SIPrefixes));
112 const Timestamp multiplier = pow(Timestamp(10),
113 (int)- prefix * 3 - FirstSIPrefixPower);
117 if (sign && !v.is_zero())
120 << qSetRealNumberPrecision(precision)
123 << SIPrefixes[prefix]
129 static QString pad_number(unsigned int number, int length)
131 return QString("%1").arg(number, length, 10, QChar('0'));
134 static QString format_time_in_full(const Timestamp& t, signed precision)
136 const Timestamp whole_seconds = floor(abs(t));
137 const Timestamp days = floor(whole_seconds / (60 * 60 * 24));
138 const unsigned int hours = fmod(whole_seconds / (60 * 60), 24).convert_to<uint>();
139 const unsigned int minutes = fmod(whole_seconds / 60, 60).convert_to<uint>();
140 const unsigned int seconds = fmod(whole_seconds, 60).convert_to<uint>();
150 bool use_padding = false;
153 ts << days.str().c_str() << ":";
158 ts << pad_number(hours, use_padding ? 2 : 0) << ":";
162 if (minutes || hours || days) {
163 ts << pad_number(minutes, use_padding ? 2 : 0);
166 // We're not showing any seconds with a negative precision
171 // precision < 0: Use DD:HH:MM format
172 // precision = 0: Use DD:HH:MM:SS format
173 // precision > 0: Use DD:HH:MM:SS.mmm nnn ppp fff format
174 if (precision >= 0) {
175 ts << pad_number(seconds, use_padding ? 2 : 0);
177 const Timestamp fraction = fabs(t) - whole_seconds;
179 if (precision > 0 && precision < 1000) {
180 std::ostringstream ss;
183 << std::setprecision(2 + precision)
186 std::string fs = ss.str();
190 // Copy all digits, inserting spaces as unit separators
191 for (int i = 1; i <= precision; i++) {
192 // Start at index 2 to skip the "0." at the beginning
195 if ((i > 0) && (i % 3 == 0) && (i != precision))
204 static QString format_time_with_si(const Timestamp& t, QString unit,
205 int prefix, unsigned int precision)
207 // The precision is always given without taking the prefix into account
208 // so we need to deduct the number of decimals the prefix might imply
209 const int prefix_order =
210 -(prefix * 3 + pv::util::FirstSIPrefixPower);
212 const unsigned int relative_prec =
213 (prefix >= EmptySIPrefix) ? precision :
214 std::max((int)(precision - prefix_order), 0);
216 return format_si_value(t, unit, prefix, relative_prec);
219 QString format_time(const Timestamp& t, int prefix, TimeUnit unit,
220 unsigned int precision)
222 // Make 0 appear as 0, not random +0 or -0
226 // If we have to use samples then we have no alternative formats
228 return format_time_with_si(t, "sa", prefix, precision);
230 // View in "normal" range -> medium precision, medium step size
231 // -> HH:MM:SS.mmm... or xxxx (si unit) if less than 60 seconds
232 // View zoomed way in -> high precision (>3), low step size (<1s)
233 // -> HH:MM:SS.mmm... or xxxx (si unit) if less than 60 seconds
235 return format_time_with_si(t, "s", prefix, precision);
237 return format_time_in_full(t, precision);
240 QString format_second(const Timestamp& second)
242 return format_si_value(second, "s", -1, 0, false);