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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 | ||
29 | #include <QTextStream> | |
30 | #include <QDebug> | |
31 | ||
32 | using namespace Qt; | |
33 | ||
34 | namespace pv { | |
35 | namespace util { | |
36 | ||
37 | static const QString SIPrefixes[17] = | |
38 | {"y", "z", "a", "f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G", | |
39 | "T", "P", "E", "Z", "Y"}; | |
40 | const int FirstSIPrefix = 8; | |
41 | const int FirstSIPrefixPower = -(FirstSIPrefix * 3); | |
42 | const double MinTimeDelta = 1e-15; // Anything below 1 fs can be considered zero | |
43 | ||
44 | QString format_si_value(double v, QString unit, int prefix, | |
45 | unsigned int precision, bool sign) | |
46 | { | |
47 | if (prefix < 0) { | |
48 | int exp = -FirstSIPrefixPower; | |
49 | ||
50 | prefix = 0; | |
51 | while ((fabs(v) * pow(10.0, exp)) > 999.0 && | |
52 | prefix < (int)(countof(SIPrefixes) - 1)) { | |
53 | prefix++; | |
54 | exp -= 3; | |
55 | } | |
56 | } | |
57 | ||
58 | assert(prefix >= 0); | |
59 | assert(prefix < (int)countof(SIPrefixes)); | |
60 | ||
61 | const double multiplier = pow(10.0, | |
62 | (int)- prefix * 3 - FirstSIPrefixPower); | |
63 | ||
64 | QString s; | |
65 | QTextStream ts(&s); | |
66 | if (sign) | |
67 | ts << forcesign; | |
68 | ts << fixed << qSetRealNumberPrecision(precision) << | |
69 | (v * multiplier) << " " << SIPrefixes[prefix] << unit; | |
70 | ||
71 | return s; | |
72 | } | |
73 | ||
74 | static QString pad_number(unsigned int number, int length) | |
75 | { | |
76 | return QString("%1").arg(number, length, 10, QChar('0')); | |
77 | } | |
78 | ||
79 | static QString format_time_in_full(double t, signed precision, bool force_sign) | |
80 | { | |
81 | const unsigned int whole_seconds = abs((int) t); | |
82 | const unsigned int days = whole_seconds / (60 * 60 * 24); | |
83 | const unsigned int hours = (whole_seconds / (60 * 60)) % 24; | |
84 | const unsigned int minutes = (whole_seconds / 60) % 60; | |
85 | const unsigned int seconds = whole_seconds % 60; | |
86 | ||
87 | QString s; | |
88 | QTextStream ts(&s); | |
89 | ||
90 | if (force_sign && (t >= 0)) | |
91 | ts << "+"; | |
92 | if (t < 0) | |
93 | ts << "-"; | |
94 | ||
95 | bool use_padding = false; | |
96 | ||
97 | if (days) { | |
98 | ts << days << ":"; | |
99 | use_padding = true; | |
100 | } | |
101 | ||
102 | if (hours || days) { | |
103 | ts << pad_number(hours, use_padding ? 2 : 0) << ":"; | |
104 | use_padding = true; | |
105 | } | |
106 | ||
107 | if (minutes || hours || days) { | |
108 | ts << pad_number(minutes, use_padding ? 2 : 0); | |
109 | use_padding = true; | |
110 | ||
111 | // We're not showing any seconds with a negative precision | |
112 | if (precision >= 0) | |
113 | ts << ":"; | |
114 | } | |
115 | ||
116 | // precision < 0: Use DD:HH:MM format | |
117 | // precision = 0: Use DD:HH:MM:SS format | |
118 | // precision > 0: Use DD:HH:MM:SS.mmm nnn ppp fff format | |
119 | if (precision >= 0) { | |
120 | ts << pad_number(seconds, use_padding ? 2 : 0); | |
121 | ||
122 | const double fraction = fabs(t - whole_seconds); | |
123 | ||
124 | if (precision > 0 && precision < 1000) { | |
125 | QString fs = QString("%1").arg(fraction, -(2 + precision), 'f', | |
126 | precision, QChar('0')); | |
127 | ||
128 | ts << "."; | |
129 | ||
130 | // Copy all digits, inserting spaces as unit separators | |
131 | for (int i = 1; i <= precision; i++) { | |
132 | // Start at index 2 to skip the "0." at the beginning | |
133 | ts << fs[1 + i]; | |
134 | ||
135 | if ((i > 0) && (i % 3 == 0)) | |
136 | ts << " "; | |
137 | } | |
138 | } | |
139 | } | |
140 | ||
141 | return s; | |
142 | } | |
143 | ||
144 | static QString format_time_with_si(double t, QString unit, int prefix, | |
145 | unsigned int precision, bool sign) | |
146 | { | |
147 | // The precision is always given without taking the prefix into account | |
148 | // so we need to deduct the number of decimals the prefix might imply | |
149 | const int prefix_order = | |
150 | -(prefix * 3 + pv::util::FirstSIPrefixPower); | |
151 | ||
152 | const unsigned int relative_prec = | |
153 | (prefix >= pv::util::FirstSIPrefix) ? precision : | |
154 | std::max((int)(precision - prefix_order), 0); | |
155 | ||
156 | return format_si_value(t, unit, prefix, relative_prec, sign); | |
157 | } | |
158 | ||
159 | QString format_time(double t, int prefix, TimeUnit unit, | |
160 | unsigned int precision, double step_size, bool sign) | |
161 | { | |
162 | // Make 0 appear as 0, not random +0 or -0 | |
163 | if (fabs(t) < MinTimeDelta) | |
164 | return "0"; | |
165 | ||
166 | // If we have to use samples then we have no alternative formats | |
167 | if (unit == Samples) | |
168 | return format_time_with_si(t, "sa", prefix, precision, sign); | |
169 | ||
170 | // View zoomed way out -> low precision (0), high step size (>=60s) | |
171 | // -> DD:HH:MM | |
172 | if ((precision == 0) && (step_size >= 60)) | |
173 | return format_time_in_full(t, -1, sign); | |
174 | ||
175 | // View in "normal" range -> medium precision, medium step size | |
176 | // -> HH:MM:SS.mmm... or xxxx (si unit) if less than 60 seconds | |
177 | // View zoomed way in -> high precision (>3), low step size (<1s) | |
178 | // -> HH:MM:SS.mmm... or xxxx (si unit) if less than 60 seconds | |
179 | if (abs(t) < 60) | |
180 | return format_time_with_si(t, "s", prefix, precision, sign); | |
181 | else | |
182 | return format_time_in_full(t, precision, sign); | |
183 | } | |
184 | ||
185 | QString format_second(double second) | |
186 | { | |
187 | return format_si_value(second, "s", -1, 0, false); | |
188 | } | |
189 | ||
190 | } // namespace util | |
191 | } // namespace pv |