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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 | #include "pv/util.h" | |
27 | ||
28 | #include <extdef.h> | |
29 | ||
30 | #include <QApplication> | |
31 | #include <QMouseEvent> | |
32 | #include <QPainter> | |
33 | #include <QTextStream> | |
34 | ||
35 | #include <pv/widgets/popup.h> | |
36 | ||
37 | using namespace Qt; | |
38 | using std::shared_ptr; | |
39 | ||
40 | namespace pv { | |
41 | namespace view { | |
42 | ||
43 | const int Ruler::RulerHeight = 30; | |
44 | const int Ruler::MinorTickSubdivision = 4; | |
45 | const int Ruler::ScaleUnits[3] = {1, 2, 5}; | |
46 | ||
47 | const int Ruler::HoverArrowSize = 5; | |
48 | ||
49 | Ruler::Ruler(View &parent) : | |
50 | MarginWidget(parent), | |
51 | _dragging(false) | |
52 | { | |
53 | setMouseTracking(true); | |
54 | ||
55 | connect(&_view, SIGNAL(hover_point_changed()), | |
56 | this, SLOT(hover_point_changed())); | |
57 | } | |
58 | ||
59 | void Ruler::clear_selection() | |
60 | { | |
61 | CursorPair &cursors = _view.cursors(); | |
62 | cursors.first()->select(false); | |
63 | cursors.second()->select(false); | |
64 | update(); | |
65 | } | |
66 | ||
67 | ||
68 | QSize Ruler::sizeHint() const | |
69 | { | |
70 | return QSize(0, RulerHeight); | |
71 | } | |
72 | ||
73 | void Ruler::paintEvent(QPaintEvent*) | |
74 | { | |
75 | ||
76 | const double SpacingIncrement = 32.0f; | |
77 | const double MinValueSpacing = 32.0f; | |
78 | const int ValueMargin = 3; | |
79 | ||
80 | QPainter p(this); | |
81 | p.setRenderHint(QPainter::Antialiasing); | |
82 | ||
83 | double min_width = SpacingIncrement, typical_width; | |
84 | double tick_period; | |
85 | unsigned int prefix; | |
86 | ||
87 | // Find tick spacing, and number formatting that does not cause | |
88 | // value to collide. | |
89 | do | |
90 | { | |
91 | const double min_period = _view.scale() * min_width; | |
92 | ||
93 | const int order = (int)floorf(log10f(min_period)); | |
94 | const double order_decimal = pow(10.0, order); | |
95 | ||
96 | unsigned int unit = 0; | |
97 | ||
98 | do | |
99 | { | |
100 | tick_period = order_decimal * ScaleUnits[unit++]; | |
101 | } while (tick_period < min_period && unit < countof(ScaleUnits)); | |
102 | ||
103 | prefix = (order - pv::util::FirstSIPrefixPower) / 3; | |
104 | ||
105 | typical_width = p.boundingRect(0, 0, INT_MAX, INT_MAX, | |
106 | AlignLeft | AlignTop, pv::util::format_time(_view.offset(), | |
107 | prefix)).width() + MinValueSpacing; | |
108 | ||
109 | min_width += SpacingIncrement; | |
110 | ||
111 | } while(typical_width > tick_period / _view.scale()); | |
112 | ||
113 | const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX, | |
114 | AlignLeft | AlignTop, "8").height(); | |
115 | ||
116 | // Draw the tick marks | |
117 | p.setPen(palette().color(foregroundRole())); | |
118 | ||
119 | const double minor_tick_period = tick_period / MinorTickSubdivision; | |
120 | const double first_major_division = | |
121 | floor(_view.offset() / tick_period); | |
122 | const double first_minor_division = | |
123 | ceil(_view.offset() / minor_tick_period); | |
124 | const double t0 = first_major_division * tick_period; | |
125 | ||
126 | int division = (int)round(first_minor_division - | |
127 | first_major_division * MinorTickSubdivision) - 1; | |
128 | ||
129 | const int major_tick_y1 = text_height + ValueMargin * 2; | |
130 | const int tick_y2 = height(); | |
131 | const int minor_tick_y1 = (major_tick_y1 + tick_y2) / 2; | |
132 | ||
133 | double x; | |
134 | ||
135 | do { | |
136 | const double t = t0 + division * minor_tick_period; | |
137 | x = (t - _view.offset()) / _view.scale(); | |
138 | ||
139 | if (division % MinorTickSubdivision == 0) | |
140 | { | |
141 | // Draw a major tick | |
142 | p.drawText(x, ValueMargin, 0, text_height, | |
143 | AlignCenter | AlignTop | TextDontClip, | |
144 | pv::util::format_time(t, prefix)); | |
145 | p.drawLine(QPointF(x, major_tick_y1), | |
146 | QPointF(x, tick_y2)); | |
147 | } | |
148 | else | |
149 | { | |
150 | // Draw a minor tick | |
151 | p.drawLine(QPointF(x, minor_tick_y1), | |
152 | QPointF(x, tick_y2)); | |
153 | } | |
154 | ||
155 | division++; | |
156 | ||
157 | } while (x < width()); | |
158 | ||
159 | // Draw the cursors | |
160 | if (_view.cursors_shown()) | |
161 | _view.cursors().draw_markers(p, rect(), prefix); | |
162 | ||
163 | // Draw the hover mark | |
164 | draw_hover_mark(p); | |
165 | ||
166 | p.end(); | |
167 | } | |
168 | ||
169 | void Ruler::mouseMoveEvent(QMouseEvent *e) | |
170 | { | |
171 | if (!(e->buttons() & Qt::LeftButton)) | |
172 | return; | |
173 | ||
174 | if ((e->pos() - _mouse_down_point).manhattanLength() < | |
175 | QApplication::startDragDistance()) | |
176 | return; | |
177 | ||
178 | _dragging = true; | |
179 | ||
180 | if (shared_ptr<TimeMarker> m = _grabbed_marker.lock()) | |
181 | m->set_time(_view.offset() + | |
182 | ((double)e->x() + 0.5) * _view.scale()); | |
183 | } | |
184 | ||
185 | void Ruler::mousePressEvent(QMouseEvent *e) | |
186 | { | |
187 | if (e->buttons() & Qt::LeftButton) | |
188 | { | |
189 | _mouse_down_point = e->pos(); | |
190 | ||
191 | _grabbed_marker.reset(); | |
192 | ||
193 | clear_selection(); | |
194 | ||
195 | if (_view.cursors_shown()) { | |
196 | CursorPair &cursors = _view.cursors(); | |
197 | if (cursors.first()->get_label_rect( | |
198 | rect()).contains(e->pos())) | |
199 | _grabbed_marker = cursors.first(); | |
200 | else if (cursors.second()->get_label_rect( | |
201 | rect()).contains(e->pos())) | |
202 | _grabbed_marker = cursors.second(); | |
203 | } | |
204 | ||
205 | if (shared_ptr<TimeMarker> m = _grabbed_marker.lock()) | |
206 | m->select(); | |
207 | ||
208 | selection_changed(); | |
209 | } | |
210 | } | |
211 | ||
212 | void Ruler::mouseReleaseEvent(QMouseEvent *) | |
213 | { | |
214 | using pv::widgets::Popup; | |
215 | ||
216 | if (!_dragging) | |
217 | if (shared_ptr<TimeMarker> m = _grabbed_marker.lock()) { | |
218 | Popup *const p = m->create_popup(&_view); | |
219 | p->set_position(mapToGlobal(QPoint(m->get_x(), | |
220 | height())), Popup::Bottom); | |
221 | p->show(); | |
222 | } | |
223 | ||
224 | _dragging = false; | |
225 | _grabbed_marker.reset(); | |
226 | } | |
227 | ||
228 | void Ruler::draw_hover_mark(QPainter &p) | |
229 | { | |
230 | const int x = _view.hover_point().x(); | |
231 | ||
232 | if (x == -1 || _dragging) | |
233 | return; | |
234 | ||
235 | p.setPen(QPen(Qt::NoPen)); | |
236 | p.setBrush(QBrush(palette().color(foregroundRole()))); | |
237 | ||
238 | const int b = height() - 1; | |
239 | const QPointF points[] = { | |
240 | QPointF(x, b), | |
241 | QPointF(x - HoverArrowSize, b - HoverArrowSize), | |
242 | QPointF(x + HoverArrowSize, b - HoverArrowSize) | |
243 | }; | |
244 | p.drawPolygon(points, countof(points)); | |
245 | } | |
246 | ||
247 | void Ruler::hover_point_changed() | |
248 | { | |
249 | update(); | |
250 | } | |
251 | ||
252 | } // namespace view | |
253 | } // namespace pv |