pv/view/analogsignal.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 <cassert>
  23 #include <cmath>
  24 #include <cstdlib>
  25 #include <limits>
  26
  27 #include <QApplication>
  28 #include <QCheckBox>
  29 #include <QComboBox>
  30 #include <QFormLayout>
  31 #include <QGridLayout>
  32 #include <QLabel>
  33 #include <QSpinBox>
  34 #include <QString>
  35
  36 #include "analogsignal.hpp"
  37 #include "pv/data/analog.hpp"
  38 #include "pv/data/analogsegment.hpp"
  39 #include "pv/data/signalbase.hpp"
  40 #include "pv/view/view.hpp"
  41
  42 #include <libsigrokcxx/libsigrokcxx.hpp>
  43
  44 using std::max;
  45 using std::make_pair;
  46 using std::min;
  47 using std::shared_ptr;
  48 using std::deque;
  49
  50 namespace pv {
  51 namespace views {
  52 namespace TraceView {
  53
  54 const QColor AnalogSignal::SignalColours[4] = {
  55         QColor(0xC4, 0xA0, 0x00),       // Yellow
  56         QColor(0x87, 0x20, 0x7A),       // Magenta
  57         QColor(0x20, 0x4A, 0x87),       // Blue
  58         QColor(0x4E, 0x9A, 0x06)        // Green
  59 };
  60
  61 const QColor AnalogSignal::GridMajorColor = QColor(0, 0, 0, 40*256/100);
  62 const QColor AnalogSignal::GridMinorColor = QColor(0, 0, 0, 20*256/100);
  63
  64 const float AnalogSignal::EnvelopeThreshold = 256.0f;
  65
  66 const int AnalogSignal::MaximumVDivs = 10;
  67 const int AnalogSignal::MinScaleIndex = -6;
  68 const int AnalogSignal::MaxScaleIndex = 7;
  69
  70 const int AnalogSignal::InfoTextMarginRight = 20;
  71 const int AnalogSignal::InfoTextMarginBottom = 5;
  72
  73 AnalogSignal::AnalogSignal(
  74         pv::Session &session,
  75         shared_ptr<data::SignalBase> base) :
  76         Signal(session, base),
  77         scale_index_(4), // 20 per div
  78         scale_index_drag_offset_(0),
  79         div_height_(3 * QFontMetrics(QApplication::font()).height()),
  80         pos_vdivs_(1),
  81         neg_vdivs_(1),
  82         resolution_(0),
  83         autoranging_(true)
  84 {
  85         pv::data::Analog* analog_data =
  86                 dynamic_cast<pv::data::Analog*>(data().get());
  87
  88         connect(analog_data, SIGNAL(samples_added(QObject*, uint64_t, uint64_t)),
  89                 this, SLOT(on_samples_added()));
  90
  91         base_->set_colour(SignalColours[base_->index() % countof(SignalColours)]);
  92         update_scale();
  93 }
  94
  95 shared_ptr<pv::data::SignalData> AnalogSignal::data() const
  96 {
  97         return base_->analog_data();
  98 }
  99
 100 void AnalogSignal::save_settings(QSettings &settings) const
 101 {
 102         settings.setValue("pos_vdivs", pos_vdivs_);
 103         settings.setValue("neg_vdivs", neg_vdivs_);
 104         settings.setValue("scale_index", scale_index_);
 105         settings.setValue("autoranging", autoranging_);
 106 }
 107
 108 void AnalogSignal::restore_settings(QSettings &settings)
 109 {
 110         if (settings.contains("pos_vdivs"))
 111                 pos_vdivs_ = settings.value("pos_vdivs").toInt();
 112
 113         if (settings.contains("neg_vdivs"))
 114                 neg_vdivs_ = settings.value("neg_vdivs").toInt();
 115
 116         if (settings.contains("scale_index")) {
 117                 scale_index_ = settings.value("scale_index").toInt();
 118                 update_scale();
 119         }
 120
 121         if (settings.contains("autoranging"))
 122                 autoranging_ = settings.value("autoranging").toBool();
 123 }
 124
 125 std::pair<int, int> AnalogSignal::v_extents() const
 126 {
 127         const int ph = pos_vdivs_ * div_height_;
 128         const int nh = neg_vdivs_ * div_height_;
 129         return make_pair(-ph, nh);
 130 }
 131
 132 int AnalogSignal::scale_handle_offset() const
 133 {
 134         const int h = (pos_vdivs_ + neg_vdivs_) * div_height_;
 135
 136         return ((scale_index_drag_offset_ - scale_index_) *
 137                 h / 4) - h / 2;
 138 }
 139
 140 void AnalogSignal::scale_handle_dragged(int offset)
 141 {
 142         const int h = (pos_vdivs_ + neg_vdivs_) * div_height_;
 143
 144         scale_index_ = scale_index_drag_offset_ -
 145                 (offset + h / 2) / (h / 4);
 146
 147         update_scale();
 148 }
 149
 150 void AnalogSignal::scale_handle_drag_release()
 151 {
 152         scale_index_drag_offset_ = scale_index_;
 153         update_scale();
 154 }
 155
 156 void AnalogSignal::paint_back(QPainter &p, const ViewItemPaintParams &pp)
 157 {
 158         if (base_->enabled()) {
 159                 Trace::paint_back(p, pp);
 160                 paint_axis(p, pp, get_visual_y());
 161         }
 162 }
 163
 164 void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
 165 {
 166         assert(base_->analog_data());
 167         assert(owner_);
 168
 169         const int y = get_visual_y();
 170
 171         if (!base_->enabled())
 172                 return;
 173
 174         paint_grid(p, y, pp.left(), pp.right());
 175
 176         const deque< shared_ptr<pv::data::AnalogSegment> > &segments =
 177                 base_->analog_data()->analog_segments();
 178         if (segments.empty())
 179                 return;
 180
 181         const shared_ptr<pv::data::AnalogSegment> &segment =
 182                 segments.front();
 183
 184         const double pixels_offset = pp.pixels_offset();
 185         const double samplerate = max(1.0, segment->samplerate());
 186         const pv::util::Timestamp& start_time = segment->start_time();
 187         const int64_t last_sample = segment->get_sample_count() - 1;
 188         const double samples_per_pixel = samplerate * pp.scale();
 189         const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);
 190         const pv::util::Timestamp end = start + samples_per_pixel * pp.width();
 191
 192         const int64_t start_sample = min(max(floor(start).convert_to<int64_t>(),
 193                 (int64_t)0), last_sample);
 194         const int64_t end_sample = min(max((ceil(end) + 1).convert_to<int64_t>(),
 195                 (int64_t)0), last_sample);
 196
 197         if (samples_per_pixel < EnvelopeThreshold)
 198                 paint_trace(p, segment, y, pp.left(),
 199                         start_sample, end_sample,
 200                         pixels_offset, samples_per_pixel);
 201         else
 202                 paint_envelope(p, segment, y, pp.left(),
 203                         start_sample, end_sample,
 204                         pixels_offset, samples_per_pixel);
 205 }
 206
 207 void AnalogSignal::paint_fore(QPainter &p, const ViewItemPaintParams &pp)
 208 {
 209         if (!enabled())
 210                 return;
 211
 212         const int y = get_visual_y();
 213
 214         // Show the info section on the right side of the trace
 215         const QString infotext = QString("%1 V/div").arg(resolution_);
 216
 217         p.setPen(base_->colour());
 218         p.setFont(QApplication::font());
 219
 220         const QRectF bounding_rect = QRectF(pp.left(),
 221                         y + v_extents().first,
 222                         pp.width() - InfoTextMarginRight,
 223                         v_extents().second - v_extents().first - InfoTextMarginBottom);
 224
 225         p.drawText(bounding_rect, Qt::AlignRight | Qt::AlignBottom, infotext);
 226 }
 227
 228 void AnalogSignal::paint_grid(QPainter &p, int y, int left, int right)
 229 {
 230         p.setRenderHint(QPainter::Antialiasing, false);
 231
 232         if (pos_vdivs_ > 0) {
 233                 p.setPen(QPen(GridMajorColor, 1, Qt::DashLine));
 234                 for (int i = 1; i <= pos_vdivs_; i++) {
 235                         const float dy = i * div_height_;
 236                         p.drawLine(QLineF(left, y - dy, right, y - dy));
 237                 }
 238
 239                 p.setPen(QPen(GridMinorColor, 1, Qt::DashLine));
 240                 for (int i = 0; i < pos_vdivs_; i++) {
 241                         const float dy = i * div_height_;
 242                         const float dy25 = dy + (0.25 * div_height_);
 243                         const float dy50 = dy + (0.50 * div_height_);
 244                         const float dy75 = dy + (0.75 * div_height_);
 245                         p.drawLine(QLineF(left, y - dy25, right, y - dy25));
 246                         p.drawLine(QLineF(left, y - dy50, right, y - dy50));
 247                         p.drawLine(QLineF(left, y - dy75, right, y - dy75));
 248                 }
 249         }
 250
 251         if (neg_vdivs_ > 0) {
 252                 p.setPen(QPen(GridMajorColor, 1, Qt::DashLine));
 253                 for (int i = 1; i <= neg_vdivs_; i++) {
 254                         const float dy = i * div_height_;
 255                         p.drawLine(QLineF(left, y + dy, right, y + dy));
 256                 }
 257
 258                 p.setPen(QPen(GridMinorColor, 1, Qt::DashLine));
 259                 for (int i = 0; i < neg_vdivs_; i++) {
 260                         const float dy = i * div_height_;
 261                         const float dy25 = dy + (0.25 * div_height_);
 262                         const float dy50 = dy + (0.50 * div_height_);
 263                         const float dy75 = dy + (0.75 * div_height_);
 264                         p.drawLine(QLineF(left, y + dy25, right, y + dy25));
 265                         p.drawLine(QLineF(left, y + dy50, right, y + dy50));
 266                         p.drawLine(QLineF(left, y + dy75, right, y + dy75));
 267                 }
 268         }
 269
 270         p.setRenderHint(QPainter::Antialiasing, true);
 271 }
 272
 273 void AnalogSignal::paint_trace(QPainter &p,
 274         const shared_ptr<pv::data::AnalogSegment> &segment,
 275         int y, int left, const int64_t start, const int64_t end,
 276         const double pixels_offset, const double samples_per_pixel)
 277 {
 278         p.setPen(base_->colour());
 279
 280         const int64_t points_count = end - start;
 281
 282         QPointF *points = new QPointF[points_count];
 283         QPointF *point = points;
 284
 285         pv::data::SegmentAnalogDataIterator* it =
 286                 segment->begin_sample_iteration(start);
 287
 288         for (int64_t sample = start; sample != end; sample++) {
 289                 const float x = (sample / samples_per_pixel -
 290                         pixels_offset) + left;
 291
 292                 *point++ = QPointF(x, y - *((float*)it->value) * scale_);
 293                 segment->continue_sample_iteration(it, 1);
 294         }
 295         segment->end_sample_iteration(it);
 296
 297         p.drawPolyline(points, points_count);
 298
 299         delete[] points;
 300 }
 301
 302 void AnalogSignal::paint_envelope(QPainter &p,
 303         const shared_ptr<pv::data::AnalogSegment> &segment,
 304         int y, int left, const int64_t start, const int64_t end,
 305         const double pixels_offset, const double samples_per_pixel)
 306 {
 307         using pv::data::AnalogSegment;
 308
 309         AnalogSegment::EnvelopeSection e;
 310         segment->get_envelope_section(e, start, end, samples_per_pixel);
 311
 312         if (e.length < 2)
 313                 return;
 314
 315         p.setPen(QPen(Qt::NoPen));
 316         p.setBrush(base_->colour());
 317
 318         QRectF *const rects = new QRectF[e.length];
 319         QRectF *rect = rects;
 320
 321         for (uint64_t sample = 0; sample < e.length-1; sample++) {
 322                 const float x = ((e.scale * sample + e.start) /
 323                         samples_per_pixel - pixels_offset) + left;
 324                 const AnalogSegment::EnvelopeSample *const s =
 325                         e.samples + sample;
 326
 327                 // We overlap this sample with the next so that vertical
 328                 // gaps do not appear during steep rising or falling edges
 329                 const float b = y - max(s->max, (s+1)->min) * scale_;
 330                 const float t = y - min(s->min, (s+1)->max) * scale_;
 331
 332                 float h = b - t;
 333                 if (h >= 0.0f && h <= 1.0f)
 334                         h = 1.0f;
 335                 if (h <= 0.0f && h >= -1.0f)
 336                         h = -1.0f;
 337
 338                 *rect++ = QRectF(x, t, 1.0f, h);
 339         }
 340
 341         p.drawRects(rects, e.length);
 342
 343         delete[] rects;
 344         delete[] e.samples;
 345 }
 346
 347 float AnalogSignal::get_resolution(int scale_index)
 348 {
 349         const float seq[] = {1.0f, 2.0f, 5.0f};
 350
 351         const int offset = std::numeric_limits<int>::max() / (2 * countof(seq));
 352         const std::div_t d = std::div(
 353                 (int)(scale_index + countof(seq) * offset),
 354                 countof(seq));
 355
 356         return powf(10.0f, d.quot - offset) * seq[d.rem];
 357 }
 358
 359 void AnalogSignal::update_scale()
 360 {
 361         resolution_ = get_resolution(scale_index_);
 362         scale_ = div_height_ / resolution_;
 363 }
 364
 365 void AnalogSignal::perform_autoranging(bool force_update)
 366 {
 367         const deque< shared_ptr<pv::data::AnalogSegment> > &segments =
 368                 base_->analog_data()->analog_segments();
 369
 370         if (segments.empty())
 371                 return;
 372
 373         static double prev_min = 0, prev_max = 0;
 374         double min = 0, max = 0;
 375
 376         for (shared_ptr<pv::data::AnalogSegment> segment : segments) {
 377                 std::pair<double, double> mm = segment->get_min_max();
 378                 min = std::min(min, mm.first);
 379                 max = std::max(max, mm.second);
 380         }
 381
 382         if ((min == prev_min) && (max == prev_max) && !force_update)
 383                 return;
 384
 385         prev_min = min;
 386         prev_max = max;
 387
 388         // Use all divs for the positive range if there are no negative values
 389         if ((min == 0) && (neg_vdivs_ > 0)) {
 390                 pos_vdivs_ += neg_vdivs_;
 391                 neg_vdivs_ = 0;
 392         }
 393
 394         // Split up the divs if there are negative values but no negative divs
 395         if ((min < 0) && (neg_vdivs_ == 0)) {
 396                 neg_vdivs_ = pos_vdivs_ / 2;
 397                 pos_vdivs_ -= neg_vdivs_;
 398         }
 399
 400         double min_value_per_div;
 401         if ((pos_vdivs_ > 0) && (neg_vdivs_ >  0))
 402                 min_value_per_div = std::max(max / pos_vdivs_, -min / neg_vdivs_);
 403         else if (pos_vdivs_ > 0)
 404                 min_value_per_div = max / pos_vdivs_;
 405         else
 406                 min_value_per_div = -min / neg_vdivs_;
 407
 408         // Find first scale value that is bigger than the value we need
 409         for (int i = MinScaleIndex; i < MaxScaleIndex; i++)
 410                 if (get_resolution(i) > min_value_per_div) {
 411                         scale_index_ = i;
 412                         break;
 413                 }
 414
 415         update_scale();
 416 }
 417
 418 void AnalogSignal::populate_popup_form(QWidget *parent, QFormLayout *form)
 419 {
 420         // Add the standard options
 421         Signal::populate_popup_form(parent, form);
 422
 423         QFormLayout *const layout = new QFormLayout;
 424
 425         // Add the number of vdivs
 426         QSpinBox *pvdiv_sb = new QSpinBox(parent);
 427         pvdiv_sb->setRange(0, MaximumVDivs);
 428         pvdiv_sb->setValue(pos_vdivs_);
 429         connect(pvdiv_sb, SIGNAL(valueChanged(int)),
 430                 this, SLOT(on_pos_vdivs_changed(int)));
 431         layout->addRow(tr("Number of pos vertical divs"), pvdiv_sb);
 432
 433         QSpinBox *nvdiv_sb = new QSpinBox(parent);
 434         nvdiv_sb->setRange(0, MaximumVDivs);
 435         nvdiv_sb->setValue(neg_vdivs_);
 436         connect(nvdiv_sb, SIGNAL(valueChanged(int)),
 437                 this, SLOT(on_neg_vdivs_changed(int)));
 438         layout->addRow(tr("Number of neg vertical divs"), nvdiv_sb);
 439
 440         // Add the vertical resolution
 441         resolution_cb_ = new QComboBox(parent);
 442
 443         for (int i = MinScaleIndex; i < MaxScaleIndex; i++) {
 444                 const QString label = QString("%1").arg(get_resolution(i));
 445                 resolution_cb_->insertItem(0, label, QVariant(i));
 446         }
 447
 448         const int cur_idx = resolution_cb_->findData(QVariant(scale_index_));
 449         resolution_cb_->setCurrentIndex(cur_idx);
 450
 451         connect(resolution_cb_, SIGNAL(currentIndexChanged(int)),
 452                 this, SLOT(on_resolution_changed(int)));
 453
 454         QGridLayout *const vdiv_layout = new QGridLayout;
 455         QLabel *const vdiv_unit = new QLabel(tr("V/div"));
 456         vdiv_layout->addWidget(resolution_cb_, 0, 0);
 457         vdiv_layout->addWidget(vdiv_unit, 0, 1);
 458
 459         layout->addRow(tr("Vertical resolution"), vdiv_layout);
 460
 461         // Add the autoranging checkbox
 462         QCheckBox* autoranging_cb = new QCheckBox();
 463         autoranging_cb->setCheckState(autoranging_ ? Qt::Checked : Qt::Unchecked);
 464
 465         connect(autoranging_cb, SIGNAL(stateChanged(int)),
 466                 this, SLOT(on_autoranging_changed(int)));
 467
 468         layout->addRow(tr("Autoranging"), autoranging_cb);
 469
 470         form->addRow(layout);
 471 }
 472
 473 void AnalogSignal::on_samples_added()
 474 {
 475         perform_autoranging();
 476
 477         if (owner_) {
 478                 // Call order is important, otherwise the lazy event handler won't work
 479                 owner_->extents_changed(false, true);
 480                 owner_->row_item_appearance_changed(false, true);
 481         }
 482 }
 483
 484 void AnalogSignal::on_pos_vdivs_changed(int vdivs)
 485 {
 486         pos_vdivs_ = vdivs;
 487
 488         if (autoranging_)
 489                 perform_autoranging(true);
 490
 491         if (owner_) {
 492                 // Call order is important, otherwise the lazy event handler won't work
 493                 owner_->extents_changed(false, true);
 494                 owner_->row_item_appearance_changed(false, true);
 495         }
 496 }
 497
 498 void AnalogSignal::on_neg_vdivs_changed(int vdivs)
 499 {
 500         neg_vdivs_ = vdivs;
 501
 502         if (autoranging_)
 503                 perform_autoranging(true);
 504
 505         if (owner_) {
 506                 // Call order is important, otherwise the lazy event handler won't work
 507                 owner_->extents_changed(false, true);
 508                 owner_->row_item_appearance_changed(false, true);
 509         }
 510 }
 511
 512 void AnalogSignal::on_resolution_changed(int index)
 513 {
 514         scale_index_ = resolution_cb_->itemData(index).toInt();
 515         update_scale();
 516
 517         if (owner_)
 518                 owner_->row_item_appearance_changed(false, true);
 519 }
 520
 521 void AnalogSignal::on_autoranging_changed(int state)
 522 {
 523         autoranging_ = (state == Qt::Checked);
 524
 525         if (autoranging_)
 526                 perform_autoranging(true);
 527
 528         if (owner_) {
 529                 // Call order is important, otherwise the lazy event handler won't work
 530                 owner_->extents_changed(false, true);
 531                 owner_->row_item_appearance_changed(false, true);
 532         }
 533 }
 534
 535 } // namespace TraceView
 536 } // namespace views
 537 } // namespace pv