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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 "ruler.h" | |
22 | ||
23 | #include "cursor.h" | |
24 | #include "view.h" | |
25 | #include "viewport.h" | |
26 | ||
27 | #include <extdef.h> | |
28 | ||
29 | #include <assert.h> | |
30 | #include <math.h> | |
31 | #include <limits.h> | |
32 | ||
33 | #include <QMouseEvent> | |
34 | #include <QPainter> | |
35 | #include <QTextStream> | |
36 | ||
37 | using namespace std; | |
38 | ||
39 | namespace pv { | |
40 | namespace view { | |
41 | ||
42 | const int Ruler::MinorTickSubdivision = 4; | |
43 | const int Ruler::ScaleUnits[3] = {1, 2, 5}; | |
44 | ||
45 | const QString Ruler::SIPrefixes[9] = | |
46 | {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"}; | |
47 | const int Ruler::FirstSIPrefixPower = -15; | |
48 | ||
49 | const int Ruler::HoverArrowSize = 5; | |
50 | ||
51 | Ruler::Ruler(View &parent) : | |
52 | QWidget(&parent), | |
53 | _view(parent), | |
54 | _grabbed_marker(NULL) | |
55 | { | |
56 | setMouseTracking(true); | |
57 | ||
58 | connect(&_view, SIGNAL(hover_point_changed()), | |
59 | this, SLOT(hover_point_changed())); | |
60 | } | |
61 | ||
62 | QString Ruler::format_time(double t, unsigned int prefix, | |
63 | unsigned int precision) | |
64 | { | |
65 | const double multiplier = pow(10.0, | |
66 | - prefix * 3 - FirstSIPrefixPower); | |
67 | ||
68 | QString s; | |
69 | QTextStream ts(&s); | |
70 | ts.setRealNumberPrecision(precision); | |
71 | ts << fixed << forcesign << (t * multiplier) << | |
72 | SIPrefixes[prefix] << "s"; | |
73 | return s; | |
74 | } | |
75 | ||
76 | void Ruler::paintEvent(QPaintEvent*) | |
77 | { | |
78 | using namespace Qt; | |
79 | ||
80 | const double SpacingIncrement = 32.0f; | |
81 | const double MinValueSpacing = 32.0f; | |
82 | const int ValueMargin = 3; | |
83 | ||
84 | QPainter p(this); | |
85 | p.setRenderHint(QPainter::Antialiasing); | |
86 | ||
87 | double min_width = SpacingIncrement, typical_width; | |
88 | double tick_period; | |
89 | unsigned int prefix; | |
90 | ||
91 | // Find tick spacing, and number formatting that does not cause | |
92 | // value to collide. | |
93 | do | |
94 | { | |
95 | const double min_period = _view.scale() * min_width; | |
96 | ||
97 | const int order = (int)floorf(log10f(min_period)); | |
98 | const double order_decimal = pow(10, order); | |
99 | ||
100 | unsigned int unit = 0; | |
101 | ||
102 | do | |
103 | { | |
104 | tick_period = order_decimal * ScaleUnits[unit++]; | |
105 | } while (tick_period < min_period && unit < countof(ScaleUnits)); | |
106 | ||
107 | prefix = (order - FirstSIPrefixPower) / 3; | |
108 | assert(prefix < countof(SIPrefixes)); | |
109 | ||
110 | ||
111 | typical_width = p.boundingRect(0, 0, INT_MAX, INT_MAX, | |
112 | AlignLeft | AlignTop, format_time(_view.offset(), | |
113 | prefix)).width() + MinValueSpacing; | |
114 | ||
115 | min_width += SpacingIncrement; | |
116 | ||
117 | } while(typical_width > tick_period / _view.scale()); | |
118 | ||
119 | const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX, | |
120 | AlignLeft | AlignTop, "8").height(); | |
121 | ||
122 | // Draw the tick marks | |
123 | p.setPen(palette().color(foregroundRole())); | |
124 | ||
125 | const double minor_tick_period = tick_period / MinorTickSubdivision; | |
126 | const double first_major_division = | |
127 | floor(_view.offset() / tick_period); | |
128 | const double first_minor_division = | |
129 | ceil(_view.offset() / minor_tick_period); | |
130 | const double t0 = first_major_division * tick_period; | |
131 | ||
132 | int division = (int)round(first_minor_division - | |
133 | first_major_division * MinorTickSubdivision); | |
134 | ||
135 | const int major_tick_y1 = text_height + ValueMargin * 2; | |
136 | const int tick_y2 = height(); | |
137 | const int minor_tick_y1 = (major_tick_y1 + tick_y2) / 2; | |
138 | ||
139 | while (1) | |
140 | { | |
141 | const double t = t0 + division * minor_tick_period; | |
142 | const double x = (t - _view.offset()) / _view.scale(); | |
143 | ||
144 | if (x >= width()) | |
145 | break; | |
146 | ||
147 | if (division % MinorTickSubdivision == 0) | |
148 | { | |
149 | // Draw a major tick | |
150 | p.drawText(x, ValueMargin, 0, text_height, | |
151 | AlignCenter | AlignTop | TextDontClip, | |
152 | format_time(t, prefix)); | |
153 | p.drawLine(QPointF(x, major_tick_y1), | |
154 | QPointF(x, tick_y2)); | |
155 | } | |
156 | else | |
157 | { | |
158 | // Draw a minor tick | |
159 | p.drawLine(QPointF(x, minor_tick_y1), | |
160 | QPointF(x, tick_y2)); | |
161 | } | |
162 | ||
163 | division++; | |
164 | } | |
165 | ||
166 | // Draw the cursors | |
167 | draw_cursors(p, prefix); | |
168 | ||
169 | // Draw the hover mark | |
170 | draw_hover_mark(p); | |
171 | ||
172 | p.end(); | |
173 | } | |
174 | ||
175 | void Ruler::mouseMoveEvent(QMouseEvent *e) | |
176 | { | |
177 | if (!_grabbed_marker) | |
178 | return; | |
179 | ||
180 | _grabbed_marker->set_time(_view.offset() + | |
181 | ((double)e->x() + 0.5) * _view.scale()); | |
182 | } | |
183 | ||
184 | void Ruler::mousePressEvent(QMouseEvent *e) | |
185 | { | |
186 | if (e->buttons() & Qt::LeftButton) { | |
187 | _grabbed_marker = NULL; | |
188 | ||
189 | if (_view.cursors_shown()) { | |
190 | std::pair<Cursor, Cursor> &cursors = | |
191 | _view.cursors(); | |
192 | if (cursors.first.get_label_rect( | |
193 | rect()).contains(e->pos())) | |
194 | _grabbed_marker = &cursors.first; | |
195 | else if (cursors.second.get_label_rect( | |
196 | rect()).contains(e->pos())) | |
197 | _grabbed_marker = &cursors.second; | |
198 | } | |
199 | } | |
200 | } | |
201 | ||
202 | void Ruler::mouseReleaseEvent(QMouseEvent *) | |
203 | { | |
204 | _grabbed_marker = NULL; | |
205 | } | |
206 | ||
207 | void Ruler::draw_cursors(QPainter &p, unsigned int prefix) | |
208 | { | |
209 | if (!_view.cursors_shown()) | |
210 | return; | |
211 | ||
212 | const QRect r = rect(); | |
213 | pair<Cursor, Cursor> &cursors = _view.cursors(); | |
214 | cursors.first.paint_label(p, r, prefix); | |
215 | cursors.second.paint_label(p, r, prefix); | |
216 | } | |
217 | ||
218 | void Ruler::draw_hover_mark(QPainter &p) | |
219 | { | |
220 | const int x = _view.hover_point().x(); | |
221 | ||
222 | if (x == -1 || _grabbed_marker) | |
223 | return; | |
224 | ||
225 | p.setPen(QPen(Qt::NoPen)); | |
226 | p.setBrush(QBrush(palette().color(foregroundRole()))); | |
227 | ||
228 | const int b = height() - 1; | |
229 | const QPointF points[] = { | |
230 | QPointF(x, b), | |
231 | QPointF(x - HoverArrowSize, b - HoverArrowSize), | |
232 | QPointF(x + HoverArrowSize, b - HoverArrowSize) | |
233 | }; | |
234 | p.drawPolygon(points, countof(points)); | |
235 | } | |
236 | ||
237 | void Ruler::hover_point_changed() | |
238 | { | |
239 | update(); | |
240 | } | |
241 | ||
242 | } // namespace view | |
243 | } // namespace pv |