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 <math.h>
  24
  25 #include "analogsignal.h"
  26 #include "pv/data/analog.h"
  27 #include "pv/data/analogsnapshot.h"
  28
  29 using namespace boost;
  30 using namespace std;
  31
  32 namespace pv {
  33 namespace view {
  34
  35 const QColor AnalogSignal::SignalColours[4] = {
  36         QColor(0xC4, 0xA0, 0x00),       // Yellow
  37         QColor(0x87, 0x20, 0x7A),       // Magenta
  38         QColor(0x20, 0x4A, 0x87),       // Blue
  39         QColor(0x4E, 0x9A, 0x06)        // Green
  40 };
  41
  42 const float AnalogSignal::EnvelopeThreshold = 256.0f;
  43
  44 AnalogSignal::AnalogSignal(const sr_probe *const probe,
  45         shared_ptr<data::Analog> data) :
  46         Signal(probe),
  47         _data(data),
  48         _scale(1.0f)
  49 {
  50         _colour = SignalColours[probe->index % countof(SignalColours)];
  51 }
  52
  53 AnalogSignal::~AnalogSignal()
  54 {
  55 }
  56
  57 const list<QAction*> AnalogSignal::get_context_bar_actions()
  58 {
  59         list<QAction*> actions;
  60         return actions;
  61 }
  62
  63 void AnalogSignal::set_scale(float scale)
  64 {
  65         _scale = scale;
  66 }
  67
  68 void AnalogSignal::paint(QPainter &p, int y, int left, int right, double scale,
  69         double offset)
  70 {
  71         assert(scale > 0);
  72         assert(_data);
  73         assert(right >= left);
  74
  75         if (!_probe->enabled)
  76                 return;
  77
  78         paint_axis(p, y, left, right);
  79
  80         const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots =
  81                 _data->get_snapshots();
  82         if (snapshots.empty())
  83                 return;
  84
  85         const shared_ptr<pv::data::AnalogSnapshot> &snapshot =
  86                 snapshots.front();
  87
  88         const double pixels_offset = offset / scale;
  89         const double samplerate = _data->get_samplerate();
  90         const double start_time = _data->get_start_time();
  91         const int64_t last_sample = snapshot->get_sample_count() - 1;
  92         const double samples_per_pixel = samplerate * scale;
  93         const double start = samplerate * (offset - start_time);
  94         const double end = start + samples_per_pixel * (right - left);
  95
  96         const int64_t start_sample = min(max((int64_t)floor(start),
  97                 (int64_t)0), last_sample);
  98         const int64_t end_sample = min(max((int64_t)ceil(end) + 1,
  99                 (int64_t)0), last_sample);
 100
 101         if (samples_per_pixel < EnvelopeThreshold)
 102                 paint_trace(p, snapshot, y, left,
 103                         start_sample, end_sample,
 104                         pixels_offset, samples_per_pixel);
 105         else
 106                 paint_envelope(p, snapshot, y, left,
 107                         start_sample, end_sample,
 108                         pixels_offset, samples_per_pixel);
 109 }
 110
 111 void AnalogSignal::paint_trace(QPainter &p,
 112         const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
 113         int y, int left, const int64_t start, const int64_t end,
 114         const double pixels_offset, const double samples_per_pixel)
 115 {
 116         const int64_t sample_count = end - start;
 117
 118         const float *const samples = snapshot->get_samples(start, end);
 119         assert(samples);
 120
 121         p.setPen(_colour);
 122
 123         QPointF *points = new QPointF[sample_count];
 124         QPointF *point = points;
 125
 126         for (int64_t sample = start; sample != end; sample++) {
 127                 const float x = (sample / samples_per_pixel -
 128                         pixels_offset) + left;
 129                 *point++ = QPointF(x,
 130                         y - samples[sample - start] * _scale);
 131         }
 132
 133         p.drawPolyline(points, point - points);
 134
 135         delete[] samples;
 136         delete[] points;
 137 }
 138
 139 void AnalogSignal::paint_envelope(QPainter &p,
 140         const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
 141         int y, int left, const int64_t start, const int64_t end,
 142         const double pixels_offset, const double samples_per_pixel)
 143 {
 144         using namespace Qt;
 145         using pv::data::AnalogSnapshot;
 146
 147         AnalogSnapshot::EnvelopeSection e;
 148         snapshot->get_envelope_section(e, start, end, samples_per_pixel);
 149
 150         if (e.length < 2)
 151                 return;
 152
 153         p.setPen(QPen(NoPen));
 154         p.setBrush(_colour);
 155
 156         QRectF *const rects = new QRectF[e.length];
 157         QRectF *rect = rects;
 158
 159         for(uint64_t sample = 0; sample < e.length-1; sample++) {
 160                 const float x = ((e.scale * sample + e.start) /
 161                         samples_per_pixel - pixels_offset) + left;
 162                 const AnalogSnapshot::EnvelopeSample *const s =
 163                         e.samples + sample;
 164
 165                 // We overlap this sample with the next so that vertical
 166                 // gaps do not appear during steep rising or falling edges
 167                 const float b = y - max(s->max, (s+1)->min) * _scale;
 168                 const float t = y - min(s->min, (s+1)->max) * _scale;
 169
 170                 float h = b - t;
 171                 if(h >= 0.0f && h <= 1.0f)
 172                         h = 1.0f;
 173                 if(h <= 0.0f && h >= -1.0f)
 174                         h = -1.0f;
 175
 176                 *rect++ = QRectF(x, t, 1.0f, h);
 177         }
 178
 179         p.drawRects(rects, e.length);
 180
 181         delete[] rects;
 182         delete[] e.samples;
 183 }
 184
 185 } // namespace view
 186 } // namespace pv