pv/views/trace/cursorpair.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2013 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 <algorithm>
  21 #include <cassert>
  22
  23 #include <QColor>
  24 #include <QMenu>
  25 #include <QToolTip>
  26
  27 #include "cursorpair.hpp"
  28
  29 #include "pv/globalsettings.hpp"
  30 #include "pv/util.hpp"
  31 #include "ruler.hpp"
  32 #include "view.hpp"
  33
  34 using std::max;
  35 using std::make_pair;
  36 using std::min;
  37 using std::shared_ptr;
  38 using std::pair;
  39
  40 namespace pv {
  41 namespace views {
  42 namespace trace {
  43
  44 const int CursorPair::DeltaPadding = 8;
  45
  46 CursorPair::CursorPair(View &view) :
  47         TimeItem(view),
  48         first_(new Cursor(view, 0.0)),
  49         second_(new Cursor(view, 1.0)),
  50         label_incomplete_(true)
  51 {
  52         GlobalSettings::add_change_handler(this);
  53
  54         GlobalSettings settings;
  55         fill_color_ = QColor::fromRgba(settings.value(
  56                 GlobalSettings::Key_View_CursorFillColor).value<uint32_t>());
  57         show_frequency_ = settings.value(
  58                 GlobalSettings::Key_View_CursorShowFrequency).value<bool>();
  59         show_interval_ = settings.value(
  60                 GlobalSettings::Key_View_CursorShowInterval).value<bool>();
  61         show_samples_ = settings.value(
  62                 GlobalSettings::Key_View_CursorShowSamples).value<bool>();
  63
  64         connect(&view_, SIGNAL(hover_point_changed(const QWidget*, QPoint)),
  65                 this, SLOT(on_hover_point_changed(const QWidget*, QPoint)));
  66 }
  67
  68 CursorPair::~CursorPair()
  69 {
  70         GlobalSettings::remove_change_handler(this);
  71 }
  72
  73 bool CursorPair::enabled() const
  74 {
  75         return view_.cursors_shown();
  76 }
  77
  78 shared_ptr<Cursor> CursorPair::first() const
  79 {
  80         return first_;
  81 }
  82
  83 shared_ptr<Cursor> CursorPair::second() const
  84 {
  85         return second_;
  86 }
  87
  88 void CursorPair::set_time(const pv::util::Timestamp& time)
  89 {
  90         const pv::util::Timestamp delta = second_->time() - first_->time();
  91         first_->set_time(time);
  92         second_->set_time(time + delta);
  93 }
  94
  95 const pv::util::Timestamp CursorPair::time() const
  96 {
  97         return 0;
  98 }
  99
 100 float CursorPair::get_x() const
 101 {
 102         return (first_->get_x() + second_->get_x()) / 2.0f;
 103 }
 104
 105 const pv::util::Timestamp CursorPair::delta(const pv::util::Timestamp& other) const
 106 {
 107         if (other < second_->time())
 108                 return other - first_->time();
 109         else
 110                 return other - second_->time();
 111 }
 112
 113 QPoint CursorPair::drag_point(const QRect &rect) const
 114 {
 115         return first_->drag_point(rect);
 116 }
 117
 118 pv::widgets::Popup* CursorPair::create_popup(QWidget *parent)
 119 {
 120         (void)parent;
 121         return nullptr;
 122 }
 123
 124 QMenu *CursorPair::create_header_context_menu(QWidget *parent)
 125 {
 126         QMenu *menu = new QMenu(parent);
 127
 128         QAction *displayIntervalAction = new QAction(tr("Display interval"), this);
 129         displayIntervalAction->setCheckable(true);
 130         displayIntervalAction->setChecked(show_interval_);
 131         menu->addAction(displayIntervalAction);
 132
 133         connect(displayIntervalAction, &QAction::toggled, displayIntervalAction,
 134                 [=]{
 135                         GlobalSettings settings;
 136                         settings.setValue(GlobalSettings::Key_View_CursorShowInterval,
 137                                 !settings.value(GlobalSettings::Key_View_CursorShowInterval).value<bool>());
 138                 });
 139
 140         QAction *displayFrequencyAction = new QAction(tr("Display frequency"), this);
 141         displayFrequencyAction->setCheckable(true);
 142         displayFrequencyAction->setChecked(show_frequency_);
 143         menu->addAction(displayFrequencyAction);
 144
 145         connect(displayFrequencyAction, &QAction::toggled, displayFrequencyAction,
 146                 [=]{
 147                         GlobalSettings settings;
 148                         settings.setValue(GlobalSettings::Key_View_CursorShowFrequency,
 149                                 !settings.value(GlobalSettings::Key_View_CursorShowFrequency).value<bool>());
 150                 });
 151
 152         QAction *displaySamplesAction = new QAction(tr("Display samples"), this);
 153         displaySamplesAction->setCheckable(true);
 154         displaySamplesAction->setChecked(show_samples_);
 155         menu->addAction(displaySamplesAction);
 156
 157         connect(displaySamplesAction, &QAction::toggled, displaySamplesAction,
 158                 [=]{
 159                         GlobalSettings settings;
 160                         settings.setValue(GlobalSettings::Key_View_CursorShowSamples,
 161                                 !settings.value(GlobalSettings::Key_View_CursorShowSamples).value<bool>());
 162                 });
 163
 164         return menu;
 165 }
 166
 167 QRectF CursorPair::label_rect(const QRectF &rect) const
 168 {
 169         const QSizeF label_size(text_size_ + LabelPadding * 2);
 170         const pair<float, float> offsets(get_cursor_offsets());
 171         const pair<float, float> normal_offsets(
 172                 (offsets.first < offsets.second) ? offsets :
 173                 make_pair(offsets.second, offsets.first));
 174
 175         const float height = label_size.height();
 176         const float left = max(normal_offsets.first + DeltaPadding, -height);
 177         const float right = min(normal_offsets.second - DeltaPadding,
 178                 (float)rect.width() + height);
 179
 180         return QRectF(left, rect.height() - label_size.height() -
 181                 TimeMarker::ArrowSize - 0.5f,
 182                 right - left, height);
 183 }
 184
 185 void CursorPair::paint_label(QPainter &p, const QRect &rect, bool hover)
 186 {
 187         assert(first_);
 188         assert(second_);
 189
 190         if (!enabled())
 191                 return;
 192
 193         const QColor text_color = ViewItem::select_text_color(Cursor::FillColor);
 194         p.setPen(text_color);
 195
 196         QRectF delta_rect(label_rect(rect));
 197         const int radius = delta_rect.height() / 2;
 198         QRectF text_rect(delta_rect.intersected(rect).adjusted(radius, 0, -radius, 0));
 199
 200         QString text = format_string(text_rect.width(),
 201                 [&p](const QString& s) -> double { return p.boundingRect(QRectF(), 0, s).width(); });
 202
 203         text_size_ = p.boundingRect(QRectF(), 0, text).size();
 204
 205         if (selected()) {
 206                 p.setBrush(Qt::transparent);
 207                 p.setPen(highlight_pen());
 208                 p.drawRoundedRect(delta_rect, radius, radius);
 209         }
 210
 211         p.setBrush(hover ? Cursor::FillColor.lighter() : Cursor::FillColor);
 212         p.setPen(Cursor::FillColor.darker());
 213         p.drawRoundedRect(delta_rect, radius, radius);
 214
 215         delta_rect.adjust(1, 1, -1, -1);
 216         p.setPen(Cursor::FillColor.lighter());
 217         const int highlight_radius = delta_rect.height() / 2 - 2;
 218         p.drawRoundedRect(delta_rect, highlight_radius, highlight_radius);
 219         label_area_ = delta_rect;
 220
 221         p.setPen(text_color);
 222         p.drawText(text_rect, Qt::AlignCenter | Qt::AlignVCenter, text);
 223 }
 224
 225 void CursorPair::paint_back(QPainter &p, ViewItemPaintParams &pp)
 226 {
 227         if (!enabled())
 228                 return;
 229
 230         p.setPen(Qt::NoPen);
 231         p.setBrush(fill_color_);
 232
 233         const pair<float, float> offsets(get_cursor_offsets());
 234         const int l = (int)max(min(offsets.first, offsets.second), 0.0f);
 235         const int r = (int)min(max(offsets.first, offsets.second), (float)pp.width());
 236
 237         p.drawRect(l, pp.top(), r - l, pp.height());
 238 }
 239
 240 QString CursorPair::format_string(int max_width, std::function<double(const QString&)> query_size)
 241 {
 242         int time_precision = 12;
 243         int freq_precision = 12;
 244
 245         QString s = format_string_sub(time_precision, freq_precision);
 246
 247         // Try full "{time} s / {freq} Hz" format
 248         if ((max_width <= 0) || (query_size(s) <= max_width)) {
 249                 label_incomplete_ = false;
 250                 return s;
 251         }
 252
 253         label_incomplete_ = true;
 254
 255         // Gradually reduce time precision to match frequency precision
 256         while (time_precision > freq_precision) {
 257                 time_precision--;
 258
 259                 s = format_string_sub(time_precision, freq_precision);
 260                 if (query_size(s) <= max_width)
 261                         return s;
 262         }
 263
 264         // Gradually reduce both precisions down to zero
 265         while (time_precision > 0) {
 266                 time_precision--;
 267                 freq_precision--;
 268
 269                 s = format_string_sub(time_precision, freq_precision);
 270                 if (query_size(s) <= max_width)
 271                         return s;
 272         }
 273
 274         // Try no trailing digits and drop the unit to at least display something
 275         s = format_string_sub(0, 0, false);
 276
 277         if (query_size(s) <= max_width)
 278                 return s;
 279
 280         // Give up
 281         return "...";
 282 }
 283
 284 pair<float, float> CursorPair::get_cursor_offsets() const
 285 {
 286         assert(first_);
 287         assert(second_);
 288
 289         return pair<float, float>(first_->get_x(), second_->get_x());
 290 }
 291
 292 void CursorPair::on_setting_changed(const QString &key, const QVariant &value)
 293 {
 294         if (key == GlobalSettings::Key_View_CursorFillColor)
 295                 fill_color_ = QColor::fromRgba(value.value<uint32_t>());
 296
 297         if (key == GlobalSettings::Key_View_CursorShowFrequency)
 298                 show_frequency_ = value.value<bool>();
 299
 300         if (key == GlobalSettings::Key_View_CursorShowInterval)
 301                 show_interval_ = value.value<bool>();
 302
 303         if (key == GlobalSettings::Key_View_CursorShowSamples)
 304                 show_samples_ = value.value<bool>();
 305 }
 306
 307 void CursorPair::on_hover_point_changed(const QWidget* widget, const QPoint& hp)
 308 {
 309         if (widget != view_.ruler())
 310                 return;
 311
 312         if (!label_incomplete_)
 313                 return;
 314
 315         if (label_area_.contains(hp))
 316                 QToolTip::showText(view_.mapToGlobal(hp), format_string());
 317         else
 318                 QToolTip::hideText();  // TODO Will break other tooltips when there can be others
 319 }
 320
 321 QString CursorPair::format_string_sub(int time_precision, int freq_precision, bool show_unit)
 322 {
 323         QString s = " ";
 324
 325         const pv::util::SIPrefix prefix = view_.tick_prefix();
 326         const pv::util::Timestamp diff = abs(second_->time() - first_->time());
 327
 328         const QString time = Ruler::format_time_with_distance(
 329                 diff, diff, prefix, (show_unit ? view_.time_unit() : pv::util::TimeUnit::None),
 330                 time_precision, false);
 331
 332         // We can only show a frequency when there's a time base
 333         if (view_.time_unit() == pv::util::TimeUnit::Time) {
 334                 int items = 0;
 335
 336                 if (show_frequency_) {
 337                         const QString freq = util::format_value_si(
 338                                 1 / diff.convert_to<double>(), pv::util::SIPrefix::unspecified,
 339                                 freq_precision, (show_unit ? "Hz" : nullptr), false);
 340                         s = QString("%1").arg(freq);
 341                         items++;
 342                 }
 343
 344                 if (show_interval_) {
 345                         if (items > 0)
 346                                 s = QString("%1 / %2").arg(s, time);
 347                         else
 348                                 s = QString("%1").arg(time);
 349                         items++;
 350                 }
 351
 352                 if (show_samples_) {
 353                         const QString samples = QString::number(
 354                                 (diff * view_.session().get_samplerate()).convert_to<uint64_t>());
 355                         if (items > 0)
 356                                 s = QString("%1 / %2").arg(s, samples);
 357                         else
 358                                 s = QString("%1").arg(samples);
 359                 }
 360         } else
 361                 // In this case, we return the number of samples, really
 362                 s = time;
 363
 364         return s;
 365 }
 366
 367 } // namespace trace
 368 } // namespace views
 369 } // namespace pv