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