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 "analogsignal.hpp"
  29 #include "pv/data/analog.hpp"
  30 #include "pv/data/analogsegment.hpp"
  31 #include "pv/view/view.hpp"
  32
  33 #include <libsigrokcxx/libsigrokcxx.hpp>
  34
  35 using std::max;
  36 using std::make_pair;
  37 using std::min;
  38 using std::shared_ptr;
  39 using std::deque;
  40
  41 using sigrok::Channel;
  42
  43 namespace pv {
  44 namespace view {
  45
  46 const int AnalogSignal::NominalHeight = 80;
  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 float AnalogSignal::EnvelopeThreshold = 256.0f;
  56
  57 AnalogSignal::AnalogSignal(
  58         pv::Session &session,
  59         shared_ptr<Channel> channel,
  60         shared_ptr<data::Analog> data) :
  61         Signal(session, channel),
  62         data_(data),
  63         scale_index_(0),
  64         scale_index_drag_offset_(0)
  65 {
  66         colour_ = SignalColours[channel_->index() % countof(SignalColours)];
  67 }
  68
  69 AnalogSignal::~AnalogSignal()
  70 {
  71 }
  72
  73 shared_ptr<pv::data::SignalData> AnalogSignal::data() const
  74 {
  75         return data_;
  76 }
  77
  78 shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
  79 {
  80         return data_;
  81 }
  82
  83 std::pair<int, int> AnalogSignal::v_extents() const
  84 {
  85         const int h = NominalHeight / 2;
  86         return make_pair(-h, h);
  87 }
  88
  89 int AnalogSignal::scale_handle_offset() const
  90 {
  91         return ((scale_index_drag_offset_ - scale_index_) *
  92                 NominalHeight / 4) - NominalHeight / 2;
  93 }
  94
  95 void AnalogSignal::scale_handle_dragged(int offset)
  96 {
  97         scale_index_ = scale_index_drag_offset_ -
  98                 (offset + NominalHeight / 2) / (NominalHeight / 4);
  99 }
 100
 101 void AnalogSignal::scale_handle_drag_release()
 102 {
 103         scale_index_drag_offset_ = scale_index_;
 104 }
 105
 106 void AnalogSignal::paint_back(QPainter &p, const ViewItemPaintParams &pp)
 107 {
 108         if (channel_->enabled())
 109                 paint_axis(p, pp, get_visual_y());
 110 }
 111
 112 void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
 113 {
 114         assert(data_);
 115         assert(owner_);
 116
 117         const int y = get_visual_y();
 118
 119         if (!channel_->enabled())
 120                 return;
 121
 122         const deque< shared_ptr<pv::data::AnalogSegment> > &segments =
 123                 data_->analog_segments();
 124         if (segments.empty())
 125                 return;
 126
 127         const shared_ptr<pv::data::AnalogSegment> &segment =
 128                 segments.front();
 129
 130         const double pixels_offset = pp.pixels_offset();
 131         const double samplerate = segment->samplerate();
 132         const pv::util::Timestamp& start_time = segment->start_time();
 133         const int64_t last_sample = segment->get_sample_count() - 1;
 134         const double samples_per_pixel = samplerate * pp.scale();
 135         const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);
 136         const pv::util::Timestamp end = start + samples_per_pixel * pp.width();
 137
 138         const int64_t start_sample = min(max(floor(start).convert_to<int64_t>(),
 139                 (int64_t)0), last_sample);
 140         const int64_t end_sample = min(max((ceil(end) + 1).convert_to<int64_t>(),
 141                 (int64_t)0), last_sample);
 142
 143         if (samples_per_pixel < EnvelopeThreshold)
 144                 paint_trace(p, segment, y, pp.left(),
 145                         start_sample, end_sample,
 146                         pixels_offset, samples_per_pixel);
 147         else
 148                 paint_envelope(p, segment, y, pp.left(),
 149                         start_sample, end_sample,
 150                         pixels_offset, samples_per_pixel);
 151 }
 152
 153 void AnalogSignal::paint_trace(QPainter &p,
 154         const shared_ptr<pv::data::AnalogSegment> &segment,
 155         int y, int left, const int64_t start, const int64_t end,
 156         const double pixels_offset, const double samples_per_pixel)
 157 {
 158         const float scale = this->scale();
 159         const int64_t sample_count = end - start;
 160
 161         const float *const samples = segment->get_samples(start, end);
 162         assert(samples);
 163
 164         p.setPen(colour_);
 165
 166         QPointF *points = new QPointF[sample_count];
 167         QPointF *point = points;
 168
 169         for (int64_t sample = start; sample != end; sample++) {
 170                 const float x = (sample / samples_per_pixel -
 171                         pixels_offset) + left;
 172                 *point++ = QPointF(x,
 173                         y - samples[sample - start] * scale);
 174         }
 175
 176         p.drawPolyline(points, point - points);
 177
 178         delete[] samples;
 179         delete[] points;
 180 }
 181
 182 void AnalogSignal::paint_envelope(QPainter &p,
 183         const shared_ptr<pv::data::AnalogSegment> &segment,
 184         int y, int left, const int64_t start, const int64_t end,
 185         const double pixels_offset, const double samples_per_pixel)
 186 {
 187         using pv::data::AnalogSegment;
 188
 189         const float scale = this->scale();
 190
 191         AnalogSegment::EnvelopeSection e;
 192         segment->get_envelope_section(e, start, end, samples_per_pixel);
 193
 194         if (e.length < 2)
 195                 return;
 196
 197         p.setPen(QPen(Qt::NoPen));
 198         p.setBrush(colour_);
 199
 200         QRectF *const rects = new QRectF[e.length];
 201         QRectF *rect = rects;
 202
 203         for (uint64_t sample = 0; sample < e.length-1; sample++) {
 204                 const float x = ((e.scale * sample + e.start) /
 205                         samples_per_pixel - pixels_offset) + left;
 206                 const AnalogSegment::EnvelopeSample *const s =
 207                         e.samples + sample;
 208
 209                 // We overlap this sample with the next so that vertical
 210                 // gaps do not appear during steep rising or falling edges
 211                 const float b = y - max(s->max, (s+1)->min) * scale;
 212                 const float t = y - min(s->min, (s+1)->max) * scale;
 213
 214                 float h = b - t;
 215                 if (h >= 0.0f && h <= 1.0f)
 216                         h = 1.0f;
 217                 if (h <= 0.0f && h >= -1.0f)
 218                         h = -1.0f;
 219
 220                 *rect++ = QRectF(x, t, 1.0f, h);
 221         }
 222
 223         p.drawRects(rects, e.length);
 224
 225         delete[] rects;
 226         delete[] e.samples;
 227 }
 228
 229 float AnalogSignal::scale() const
 230 {
 231         const float seq[] = {1.0f, 2.0f, 5.0f};
 232         const int offset = std::numeric_limits<int>::max() / (2 * countof(seq));
 233         const std::div_t d = std::div(
 234                 (int)(scale_index_ + countof(seq) * offset),
 235                 countof(seq));
 236         return powf(10.0f, d.quot - offset) * seq[d.rem];
 237 }
 238
 239 } // namespace view
 240 } // namespace pv