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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 boost; | |
38 | using namespace std; | |
39 | ||
40 | namespace pv { | |
41 | namespace view { | |
42 | ||
43 | const int Ruler::MinorTickSubdivision = 4; | |
44 | const int Ruler::ScaleUnits[3] = {1, 2, 5}; | |
45 | ||
46 | const QString Ruler::SIPrefixes[9] = | |
47 | {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"}; | |
48 | const int Ruler::FirstSIPrefixPower = -15; | |
49 | ||
50 | const int Ruler::HoverArrowSize = 5; | |
51 | ||
52 | Ruler::Ruler(View &parent) : | |
53 | MarginWidget(parent), | |
54 | _dragging(false) | |
55 | { | |
56 | setMouseTracking(true); | |
57 | ||
58 | connect(&_view, SIGNAL(hover_point_changed()), | |
59 | this, SLOT(hover_point_changed())); | |
60 | } | |
61 | ||
62 | void Ruler::clear_selection() | |
63 | { | |
64 | CursorPair &cursors = _view.cursors(); | |
65 | cursors.first()->select(false); | |
66 | cursors.second()->select(false); | |
67 | update(); | |
68 | } | |
69 | ||
70 | QString Ruler::format_time(double t, unsigned int prefix, | |
71 | unsigned int precision) | |
72 | { | |
73 | const double multiplier = pow(10.0, | |
74 | - prefix * 3 - FirstSIPrefixPower); | |
75 | ||
76 | QString s; | |
77 | QTextStream ts(&s); | |
78 | ts.setRealNumberPrecision(precision); | |
79 | ts << fixed << forcesign << (t * multiplier) << | |
80 | SIPrefixes[prefix] << "s"; | |
81 | return s; | |
82 | } | |
83 | ||
84 | void Ruler::paintEvent(QPaintEvent*) | |
85 | { | |
86 | using namespace Qt; | |
87 | ||
88 | const double SpacingIncrement = 32.0f; | |
89 | const double MinValueSpacing = 32.0f; | |
90 | const int ValueMargin = 3; | |
91 | ||
92 | QPainter p(this); | |
93 | p.setRenderHint(QPainter::Antialiasing); | |
94 | ||
95 | double min_width = SpacingIncrement, typical_width; | |
96 | double tick_period; | |
97 | unsigned int prefix; | |
98 | ||
99 | // Find tick spacing, and number formatting that does not cause | |
100 | // value to collide. | |
101 | do | |
102 | { | |
103 | const double min_period = _view.scale() * min_width; | |
104 | ||
105 | const int order = (int)floorf(log10f(min_period)); | |
106 | const double order_decimal = pow(10, order); | |
107 | ||
108 | unsigned int unit = 0; | |
109 | ||
110 | do | |
111 | { | |
112 | tick_period = order_decimal * ScaleUnits[unit++]; | |
113 | } while (tick_period < min_period && unit < countof(ScaleUnits)); | |
114 | ||
115 | prefix = (order - FirstSIPrefixPower) / 3; | |
116 | assert(prefix < countof(SIPrefixes)); | |
117 | ||
118 | ||
119 | typical_width = p.boundingRect(0, 0, INT_MAX, INT_MAX, | |
120 | AlignLeft | AlignTop, format_time(_view.offset(), | |
121 | prefix)).width() + MinValueSpacing; | |
122 | ||
123 | min_width += SpacingIncrement; | |
124 | ||
125 | } while(typical_width > tick_period / _view.scale()); | |
126 | ||
127 | const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX, | |
128 | AlignLeft | AlignTop, "8").height(); | |
129 | ||
130 | // Draw the tick marks | |
131 | p.setPen(palette().color(foregroundRole())); | |
132 | ||
133 | const double minor_tick_period = tick_period / MinorTickSubdivision; | |
134 | const double first_major_division = | |
135 | floor(_view.offset() / tick_period); | |
136 | const double first_minor_division = | |
137 | ceil(_view.offset() / minor_tick_period); | |
138 | const double t0 = first_major_division * tick_period; | |
139 | ||
140 | int division = (int)round(first_minor_division - | |
141 | first_major_division * MinorTickSubdivision) - 1; | |
142 | ||
143 | const int major_tick_y1 = text_height + ValueMargin * 2; | |
144 | const int tick_y2 = height(); | |
145 | const int minor_tick_y1 = (major_tick_y1 + tick_y2) / 2; | |
146 | ||
147 | double x; | |
148 | ||
149 | do { | |
150 | const double t = t0 + division * minor_tick_period; | |
151 | x = (t - _view.offset()) / _view.scale(); | |
152 | ||
153 | if (division % MinorTickSubdivision == 0) | |
154 | { | |
155 | // Draw a major tick | |
156 | p.drawText(x, ValueMargin, 0, text_height, | |
157 | AlignCenter | AlignTop | TextDontClip, | |
158 | format_time(t, prefix)); | |
159 | p.drawLine(QPointF(x, major_tick_y1), | |
160 | QPointF(x, tick_y2)); | |
161 | } | |
162 | else | |
163 | { | |
164 | // Draw a minor tick | |
165 | p.drawLine(QPointF(x, minor_tick_y1), | |
166 | QPointF(x, tick_y2)); | |
167 | } | |
168 | ||
169 | division++; | |
170 | ||
171 | } while (x < width()); | |
172 | ||
173 | // Draw the cursors | |
174 | if (_view.cursors_shown()) | |
175 | _view.cursors().draw_markers(p, rect(), prefix); | |
176 | ||
177 | // Draw the hover mark | |
178 | draw_hover_mark(p); | |
179 | ||
180 | p.end(); | |
181 | } | |
182 | ||
183 | void Ruler::mouseMoveEvent(QMouseEvent *e) | |
184 | { | |
185 | if (!(e->buttons() & Qt::LeftButton)) | |
186 | return; | |
187 | ||
188 | if ((e->pos() - _mouse_down_point).manhattanLength() < | |
189 | QApplication::startDragDistance()) | |
190 | return; | |
191 | ||
192 | _dragging = true; | |
193 | ||
194 | if (shared_ptr<TimeMarker> m = _grabbed_marker.lock()) | |
195 | m->set_time(_view.offset() + | |
196 | ((double)e->x() + 0.5) * _view.scale()); | |
197 | } | |
198 | ||
199 | void Ruler::mousePressEvent(QMouseEvent *e) | |
200 | { | |
201 | if (e->buttons() & Qt::LeftButton) | |
202 | { | |
203 | _mouse_down_point = e->pos(); | |
204 | ||
205 | _grabbed_marker.reset(); | |
206 | ||
207 | clear_selection(); | |
208 | ||
209 | if (_view.cursors_shown()) { | |
210 | CursorPair &cursors = _view.cursors(); | |
211 | if (cursors.first()->get_label_rect( | |
212 | rect()).contains(e->pos())) | |
213 | _grabbed_marker = cursors.first(); | |
214 | else if (cursors.second()->get_label_rect( | |
215 | rect()).contains(e->pos())) | |
216 | _grabbed_marker = cursors.second(); | |
217 | } | |
218 | ||
219 | if (shared_ptr<TimeMarker> m = _grabbed_marker.lock()) | |
220 | m->select(); | |
221 | ||
222 | selection_changed(); | |
223 | } | |
224 | } | |
225 | ||
226 | void Ruler::mouseReleaseEvent(QMouseEvent *) | |
227 | { | |
228 | _dragging = false; | |
229 | _grabbed_marker.reset(); | |
230 | } | |
231 | ||
232 | void Ruler::draw_hover_mark(QPainter &p) | |
233 | { | |
234 | const int x = _view.hover_point().x(); | |
235 | ||
236 | if (x == -1 || _dragging) | |
237 | return; | |
238 | ||
239 | p.setPen(QPen(Qt::NoPen)); | |
240 | p.setBrush(QBrush(palette().color(foregroundRole()))); | |
241 | ||
242 | const int b = height() - 1; | |
243 | const QPointF points[] = { | |
244 | QPointF(x, b), | |
245 | QPointF(x - HoverArrowSize, b - HoverArrowSize), | |
246 | QPointF(x + HoverArrowSize, b - HoverArrowSize) | |
247 | }; | |
248 | p.drawPolygon(points, countof(points)); | |
249 | } | |
250 | ||
251 | void Ruler::hover_point_changed() | |
252 | { | |
253 | update(); | |
254 | } | |
255 | ||
256 | } // namespace view | |
257 | } // namespace pv |