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