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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <extdef.h>
  22
  23 #include <cassert>
  24 #include <cmath>
  25 #include <cstdlib>
  26 #include <limits>
  27
  28 #include <QApplication>
  29 #include <QComboBox>
  30 #include <QFormLayout>
  31 #include <QGridLayout>
  32 #include <QLabel>
  33 #include <QSpinBox>
  34
  35 #include "analogsignal.hpp"
  36 #include "pv/data/analog.hpp"
  37 #include "pv/data/analogsegment.hpp"
  38 #include "pv/view/view.hpp"
  39
  40 #include <libsigrokcxx/libsigrokcxx.hpp>
  41
  42 using std::max;
  43 using std::make_pair;
  44 using std::min;
  45 using std::shared_ptr;
  46 using std::deque;
  47
  48 using sigrok::Channel;
  49
  50 namespace pv {
  51 namespace view {
  52
  53 const QColor AnalogSignal::SignalColours[4] = {
  54         QColor(0xC4, 0xA0, 0x00),       // Yellow
  55         QColor(0x87, 0x20, 0x7A),       // Magenta
  56         QColor(0x20, 0x4A, 0x87),       // Blue
  57         QColor(0x4E, 0x9A, 0x06)        // Green
  58 };
  59
  60 const QColor AnalogSignal::GridMajorColor = QColor(0xB0, 0xB0, 0xB0);
  61 const QColor AnalogSignal::GridMinorColor = QColor(0xD0, 0xD0, 0xD0);
  62
  63 const float AnalogSignal::EnvelopeThreshold = 256.0f;
  64
  65 const int AnalogSignal::MaximumVDivs = 10;
  66 const int AnalogSignal::MinScaleIndex = -6;
  67 const int AnalogSignal::MaxScaleIndex = 7;
  68
  69 AnalogSignal::AnalogSignal(
  70         pv::Session &session,
  71         shared_ptr<Channel> channel,
  72         shared_ptr<data::Analog> data) :
  73         Signal(session, channel),
  74         data_(data),
  75         scale_index_(4), // 20 per div
  76         scale_index_drag_offset_(0),
  77         div_height_(3 * QFontMetrics(QApplication::font()).height()),
  78         vdivs_(1),
  79         resolution_(0)
  80 {
  81         set_colour(SignalColours[channel_->index() % countof(SignalColours)]);
  82         update_scale();
  83 }
  84
  85 shared_ptr<pv::data::SignalData> AnalogSignal::data() const
  86 {
  87         return data_;
  88 }
  89
  90 shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
  91 {
  92         return data_;
  93 }
  94
  95 std::pair<int, int> AnalogSignal::v_extents() const
  96 {
  97         const int h = vdivs_ * div_height_;
  98         return make_pair(-h, h);
  99 }
 100
 101 int AnalogSignal::scale_handle_offset() const
 102 {
 103         const int h = vdivs_ * div_height_;
 104
 105         return ((scale_index_drag_offset_ - scale_index_) *
 106                 h / 4) - h / 2;
 107 }
 108
 109 void AnalogSignal::scale_handle_dragged(int offset)
 110 {
 111         const int h = vdivs_ * div_height_;
 112
 113         scale_index_ = scale_index_drag_offset_ -
 114                 (offset + h / 2) / (h / 4);
 115
 116         update_scale();
 117 }
 118
 119 void AnalogSignal::scale_handle_drag_release()
 120 {
 121         scale_index_drag_offset_ = scale_index_;
 122         update_scale();
 123 }
 124
 125 void AnalogSignal::paint_back(QPainter &p, const ViewItemPaintParams &pp)
 126 {
 127         if (channel_->enabled()) {
 128                 Trace::paint_back(p, pp);
 129                 paint_axis(p, pp, get_visual_y());
 130         }
 131 }
 132
 133 void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
 134 {
 135         assert(data_);
 136         assert(owner_);
 137
 138         const int y = get_visual_y();
 139
 140         if (!channel_->enabled())
 141                 return;
 142
 143         paint_grid(p, y, pp.left(), pp.right());
 144
 145         const deque< shared_ptr<pv::data::AnalogSegment> > &segments =
 146                 data_->analog_segments();
 147         if (segments.empty())
 148                 return;
 149
 150         const shared_ptr<pv::data::AnalogSegment> &segment =
 151                 segments.front();
 152
 153         const double pixels_offset = pp.pixels_offset();
 154         const double samplerate = max(1.0, segment->samplerate());
 155         const pv::util::Timestamp& start_time = segment->start_time();
 156         const int64_t last_sample = segment->get_sample_count() - 1;
 157         const double samples_per_pixel = samplerate * pp.scale();
 158         const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);
 159         const pv::util::Timestamp end = start + samples_per_pixel * pp.width();
 160
 161         const int64_t start_sample = min(max(floor(start).convert_to<int64_t>(),
 162                 (int64_t)0), last_sample);
 163         const int64_t end_sample = min(max((ceil(end) + 1).convert_to<int64_t>(),
 164                 (int64_t)0), last_sample);
 165
 166         if (samples_per_pixel < EnvelopeThreshold)
 167                 paint_trace(p, segment, y, pp.left(),
 168                         start_sample, end_sample,
 169                         pixels_offset, samples_per_pixel);
 170         else
 171                 paint_envelope(p, segment, y, pp.left(),
 172                         start_sample, end_sample,
 173                         pixels_offset, samples_per_pixel);
 174 }
 175
 176 void AnalogSignal::paint_grid(QPainter &p, int y, int left, int right)
 177 {
 178         p.setPen(QPen(GridMajorColor, 0.5, Qt::DashLine));
 179         for (int i = 1; i <= vdivs_; i++) {
 180                 const int dy = i * div_height_;
 181                 p.drawLine(QLineF(left, y - dy, right, y - dy));
 182                 p.drawLine(QLineF(left, y + dy, right, y + dy));
 183         }
 184
 185         p.setPen(QPen(GridMinorColor, 0.5, Qt::DashLine));
 186         for (int i = 0; i < vdivs_; i++) {
 187                 const int dy = i * div_height_;
 188                 const float dy25 = dy + (0.25 * div_height_);
 189                 const float dy50 = dy + (0.50 * div_height_);
 190                 const float dy75 = dy + (0.75 * div_height_);
 191                 p.drawLine(QLineF(left, y - dy25, right, y - dy25));
 192                 p.drawLine(QLineF(left, y + dy25, right, y + dy25));
 193                 p.drawLine(QLineF(left, y - dy50, right, y - dy50));
 194                 p.drawLine(QLineF(left, y + dy50, right, y + dy50));
 195                 p.drawLine(QLineF(left, y - dy75, right, y - dy75));
 196                 p.drawLine(QLineF(left, y + dy75, right, y + dy75));
 197         }
 198 }
 199
 200 void AnalogSignal::paint_trace(QPainter &p,
 201         const shared_ptr<pv::data::AnalogSegment> &segment,
 202         int y, int left, const int64_t start, const int64_t end,
 203         const double pixels_offset, const double samples_per_pixel)
 204 {
 205         const int64_t sample_count = end - start;
 206
 207         const float *const samples = segment->get_samples(start, end);
 208         assert(samples);
 209
 210         p.setPen(colour_);
 211
 212         QPointF *points = new QPointF[sample_count];
 213         QPointF *point = points;
 214
 215         for (int64_t sample = start; sample != end; sample++) {
 216                 const float x = (sample / samples_per_pixel -
 217                         pixels_offset) + left;
 218                 *point++ = QPointF(x,
 219                         y - samples[sample - start] * scale_);
 220         }
 221
 222         p.drawPolyline(points, point - points);
 223
 224         delete[] samples;
 225         delete[] points;
 226 }
 227
 228 void AnalogSignal::paint_envelope(QPainter &p,
 229         const shared_ptr<pv::data::AnalogSegment> &segment,
 230         int y, int left, const int64_t start, const int64_t end,
 231         const double pixels_offset, const double samples_per_pixel)
 232 {
 233         using pv::data::AnalogSegment;
 234
 235         AnalogSegment::EnvelopeSection e;
 236         segment->get_envelope_section(e, start, end, samples_per_pixel);
 237
 238         if (e.length < 2)
 239                 return;
 240
 241         p.setPen(QPen(Qt::NoPen));
 242         p.setBrush(colour_);
 243
 244         QRectF *const rects = new QRectF[e.length];
 245         QRectF *rect = rects;
 246
 247         for (uint64_t sample = 0; sample < e.length-1; sample++) {
 248                 const float x = ((e.scale * sample + e.start) /
 249                         samples_per_pixel - pixels_offset) + left;
 250                 const AnalogSegment::EnvelopeSample *const s =
 251                         e.samples + sample;
 252
 253                 // We overlap this sample with the next so that vertical
 254                 // gaps do not appear during steep rising or falling edges
 255                 const float b = y - max(s->max, (s+1)->min) * scale_;
 256                 const float t = y - min(s->min, (s+1)->max) * scale_;
 257
 258                 float h = b - t;
 259                 if (h >= 0.0f && h <= 1.0f)
 260                         h = 1.0f;
 261                 if (h <= 0.0f && h >= -1.0f)
 262                         h = -1.0f;
 263
 264                 *rect++ = QRectF(x, t, 1.0f, h);
 265         }
 266
 267         p.drawRects(rects, e.length);
 268
 269         delete[] rects;
 270         delete[] e.samples;
 271 }
 272
 273 float AnalogSignal::get_resolution(int scale_index)
 274 {
 275         const float seq[] = {1.0f, 2.0f, 5.0f};
 276
 277         const int offset = std::numeric_limits<int>::max() / (2 * countof(seq));
 278         const std::div_t d = std::div(
 279                 (int)(scale_index + countof(seq) * offset),
 280                 countof(seq));
 281
 282         return powf(10.0f, d.quot - offset) * seq[d.rem];
 283 }
 284
 285 void AnalogSignal::update_scale()
 286 {
 287         resolution_ = get_resolution(scale_index_);
 288         scale_ = div_height_ / resolution_;
 289 }
 290
 291 void AnalogSignal::populate_popup_form(QWidget *parent, QFormLayout *form)
 292 {
 293         // Add the standard options
 294         Signal::populate_popup_form(parent, form);
 295
 296         QFormLayout *const layout = new QFormLayout;
 297
 298         // Add the number of vdivs
 299         QSpinBox *vdiv_sb = new QSpinBox(parent);
 300         vdiv_sb->setRange(1, MaximumVDivs);
 301         vdiv_sb->setValue(vdivs_);
 302         connect(vdiv_sb, SIGNAL(valueChanged(int)),
 303                 this, SLOT(on_vdivs_changed(int)));
 304         layout->addRow(tr("Number of vertical divs"), vdiv_sb);
 305
 306         // Add the vertical resolution
 307         resolution_cb_ = new QComboBox(parent);
 308
 309         for (int i = MinScaleIndex; i < MaxScaleIndex; i++) {
 310                 const QString label = QString("%1").arg(get_resolution(i));
 311                 resolution_cb_->insertItem(0, label, QVariant(i));
 312         }
 313
 314         const int cur_idx = resolution_cb_->findData(QVariant(scale_index_));
 315         resolution_cb_->setCurrentIndex(cur_idx);
 316
 317         connect(resolution_cb_, SIGNAL(currentIndexChanged(int)),
 318                 this, SLOT(on_resolution_changed(int)));
 319
 320         QGridLayout *const vdiv_layout = new QGridLayout;
 321         QLabel *const vdiv_unit = new QLabel(tr("V/div"));
 322         vdiv_layout->addWidget(resolution_cb_, 0, 0);
 323         vdiv_layout->addWidget(vdiv_unit, 0, 1);
 324
 325         layout->addRow(tr("Vertical resolution"), vdiv_layout);
 326
 327         form->addRow(layout);
 328 }
 329
 330 void AnalogSignal::on_vdivs_changed(int vdivs)
 331 {
 332         vdivs_ = vdivs;
 333
 334         if (owner_)
 335                 owner_->extents_changed(false, true);
 336 }
 337
 338 void AnalogSignal::on_resolution_changed(int index)
 339 {
 340         scale_index_ = resolution_cb_->itemData(index).toInt();
 341         update_scale();
 342
 343         if (owner_)
 344                 owner_->row_item_appearance_changed(false, true);
 345 }
 346
 347 } // namespace view
 348 } // namespace pv