]> sigrok.org Git - pulseview.git/blob - pv/views/trace/ruler.cpp
Revert 33d5aa61e77e61f700a8 to re-enable A2L conversion
[pulseview.git] / pv / views / trace / ruler.cpp
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, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include <extdef.h>
21
22 #include <QApplication>
23 #include <QFontMetrics>
24 #include <QMouseEvent>
25
26 #include "ruler.hpp"
27 #include "view.hpp"
28
29 using namespace Qt;
30
31 using std::function;
32 using std::shared_ptr;
33 using std::vector;
34
35 namespace pv {
36 namespace views {
37 namespace trace {
38
39 const float Ruler::RulerHeight = 2.5f; // x Text Height
40 const int Ruler::MinorTickSubdivision = 4;
41
42 const float Ruler::HoverArrowSize = 0.5f; // x Text Height
43
44 Ruler::Ruler(View &parent) :
45         MarginWidget(parent)
46 {
47         setMouseTracking(true);
48
49         connect(&view_, SIGNAL(hover_point_changed()),
50                 this, SLOT(hover_point_changed()));
51         connect(&view_, SIGNAL(offset_changed()),
52                 this, SLOT(invalidate_tick_position_cache()));
53         connect(&view_, SIGNAL(scale_changed()),
54                 this, SLOT(invalidate_tick_position_cache()));
55         connect(&view_, SIGNAL(tick_prefix_changed()),
56                 this, SLOT(invalidate_tick_position_cache()));
57         connect(&view_, SIGNAL(tick_precision_changed()),
58                 this, SLOT(invalidate_tick_position_cache()));
59         connect(&view_, SIGNAL(tick_period_changed()),
60                 this, SLOT(invalidate_tick_position_cache()));
61         connect(&view_, SIGNAL(time_unit_changed()),
62                 this, SLOT(invalidate_tick_position_cache()));
63 }
64
65 QSize Ruler::sizeHint() const
66 {
67         const int text_height = calculate_text_height();
68         return QSize(0, RulerHeight * text_height);
69 }
70
71 QSize Ruler::extended_size_hint() const
72 {
73         QRectF max_rect;
74         vector< shared_ptr<TimeItem> > items(view_.time_items());
75         for (auto &i : items)
76                 max_rect = max_rect.united(i->label_rect(QRect()));
77         return QSize(0, sizeHint().height() - max_rect.top() / 2 +
78                 ViewItem::HighlightRadius);
79 }
80
81 QString Ruler::format_time_with_distance(
82         const pv::util::Timestamp& distance,
83         const pv::util::Timestamp& t,
84         pv::util::SIPrefix prefix,
85         pv::util::TimeUnit unit,
86         unsigned precision,
87         bool sign)
88 {
89         const unsigned limit = 60;
90
91         if (t.is_zero())
92                 return "0";
93
94         // If we have to use samples then we have no alternative formats
95         if (unit == pv::util::TimeUnit::Samples)
96                 return pv::util::format_time_si_adjusted(t, prefix, precision, "sa", sign);
97
98         // View zoomed way out -> low precision (0), big distance (>=60s)
99         // -> DD:HH:MM
100         if ((precision == 0) && (distance >= limit))
101                 return pv::util::format_time_minutes(t, 0, sign);
102
103         // View in "normal" range -> medium precision, medium step size
104         // -> HH:MM:SS.mmm... or xxxx (si unit) if less than limit seconds
105         // View zoomed way in -> high precision (>3), low step size (<1s)
106         // -> HH:MM:SS.mmm... or xxxx (si unit) if less than limit seconds
107         if (abs(t) < limit)
108                 return pv::util::format_time_si_adjusted(t, prefix, precision, "s", sign);
109         else
110                 return pv::util::format_time_minutes(t, precision, sign);
111 }
112
113 vector< shared_ptr<ViewItem> > Ruler::items()
114 {
115         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
116         return vector< shared_ptr<ViewItem> >(
117                 time_items.begin(), time_items.end());
118 }
119
120 shared_ptr<ViewItem> Ruler::get_mouse_over_item(const QPoint &pt)
121 {
122         const vector< shared_ptr<TimeItem> > items(view_.time_items());
123         for (auto i = items.rbegin(); i != items.rend(); i++)
124                 if ((*i)->enabled() && (*i)->label_rect(rect()).contains(pt))
125                         return *i;
126         return nullptr;
127 }
128
129 void Ruler::paintEvent(QPaintEvent*)
130 {
131         if (!tick_position_cache_) {
132                 auto ffunc = [this](const pv::util::Timestamp& t) {
133                         return format_time_with_distance(
134                                 this->view_.tick_period(),
135                                 t,
136                                 this->view_.tick_prefix(),
137                                 this->view_.time_unit(),
138                                 this->view_.tick_precision());
139                 };
140
141                 tick_position_cache_ = calculate_tick_positions(
142                         view_.tick_period(),
143                         view_.offset(),
144                         view_.scale(),
145                         width(),
146                         ffunc);
147         }
148
149         const int ValueMargin = 3;
150
151         const int text_height = calculate_text_height();
152         const int ruler_height = RulerHeight * text_height;
153         const int major_tick_y1 = text_height + ValueMargin * 2;
154         const int minor_tick_y1 = (major_tick_y1 + ruler_height) / 2;
155
156         QPainter p(this);
157
158         // Draw the tick marks
159         p.setPen(palette().color(foregroundRole()));
160
161         for (const auto& tick: tick_position_cache_->major) {
162                 p.drawText(tick.first, ValueMargin, 0, text_height,
163                                 AlignCenter | AlignTop | TextDontClip, tick.second);
164                 p.drawLine(QPointF(tick.first, major_tick_y1),
165                         QPointF(tick.first, ruler_height));
166         }
167
168         for (const auto& tick: tick_position_cache_->minor) {
169                 p.drawLine(QPointF(tick, minor_tick_y1),
170                                 QPointF(tick, ruler_height));
171         }
172
173         // Draw the hover mark
174         draw_hover_mark(p, text_height);
175
176         p.setRenderHint(QPainter::Antialiasing);
177
178         // The cursor labels are not drawn with the arrows exactly on the
179         // bottom line of the widget, because then the selection shadow
180         // would be clipped away.
181         const QRect r = rect().adjusted(0, 0, 0, -ViewItem::HighlightRadius);
182
183         // Draw the items
184         const vector< shared_ptr<TimeItem> > items(view_.time_items());
185         for (auto &i : items) {
186                 const bool highlight = !item_dragging_ &&
187                         i->label_rect(r).contains(mouse_point_);
188                 i->paint_label(p, r, highlight);
189         }
190 }
191
192 Ruler::TickPositions Ruler::calculate_tick_positions(
193         const pv::util::Timestamp& major_period,
194         const pv::util::Timestamp& offset,
195         const double scale,
196         const int width,
197         function<QString(const pv::util::Timestamp&)> format_function)
198 {
199         TickPositions tp;
200
201         const pv::util::Timestamp minor_period = major_period / MinorTickSubdivision;
202         const pv::util::Timestamp first_major_division = floor(offset / major_period);
203         const pv::util::Timestamp first_minor_division = ceil(offset / minor_period);
204         const pv::util::Timestamp t0 = first_major_division * major_period;
205
206         int division = (round(first_minor_division -
207                 first_major_division * MinorTickSubdivision)).convert_to<int>() - 1;
208
209         double x;
210
211         do {
212                 pv::util::Timestamp t = t0 + division * minor_period;
213                 x = ((t - offset) / scale).convert_to<double>();
214
215                 if (division % MinorTickSubdivision == 0) {
216                         // Recalculate 't' without using 'minor_period' which is a fraction
217                         t = t0 + division / MinorTickSubdivision * major_period;
218                         tp.major.emplace_back(x, format_function(t));
219                 } else {
220                         tp.minor.emplace_back(x);
221                 }
222
223                 division++;
224         } while (x < width);
225
226         return tp;
227 }
228
229 void Ruler::mouseDoubleClickEvent(QMouseEvent *event)
230 {
231         view_.add_flag(view_.offset() + ((double)event->x() + 0.5) * view_.scale());
232 }
233
234 void Ruler::draw_hover_mark(QPainter &p, int text_height)
235 {
236         const int x = view_.hover_point().x();
237
238         if (x == -1)
239                 return;
240
241         p.setPen(QPen(Qt::NoPen));
242         p.setBrush(QBrush(palette().color(foregroundRole())));
243
244         const int b = RulerHeight * text_height;
245         const float hover_arrow_size = HoverArrowSize * text_height;
246         const QPointF points[] = {
247                 QPointF(x, b),
248                 QPointF(x - hover_arrow_size, b - hover_arrow_size),
249                 QPointF(x + hover_arrow_size, b - hover_arrow_size)
250         };
251         p.drawPolygon(points, countof(points));
252 }
253
254 int Ruler::calculate_text_height() const
255 {
256         return QFontMetrics(font()).ascent();
257 }
258
259 void Ruler::hover_point_changed()
260 {
261         update();
262 }
263
264 void Ruler::invalidate_tick_position_cache()
265 {
266         tick_position_cache_ = boost::none;
267 }
268
269 void Ruler::resizeEvent(QResizeEvent*)
270 {
271         // the tick calculation depends on the width of this widget
272         invalidate_tick_position_cache();
273 }
274
275 } // namespace trace
276 } // namespace views
277 } // namespace pv