2 * This file is part of the PulseView project.
4 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
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.
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.
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
26 #include "analogsignal.h"
27 #include "pv/data/analog.h"
28 #include "pv/data/analogsnapshot.h"
29 #include "pv/view/view.h"
31 #include <libsigrok/libsigrok.hpp>
35 using std::shared_ptr;
38 using sigrok::Channel;
43 const QColor AnalogSignal::SignalColours[4] = {
44 QColor(0xC4, 0xA0, 0x00), // Yellow
45 QColor(0x87, 0x20, 0x7A), // Magenta
46 QColor(0x20, 0x4A, 0x87), // Blue
47 QColor(0x4E, 0x9A, 0x06) // Green
50 const float AnalogSignal::EnvelopeThreshold = 256.0f;
52 AnalogSignal::AnalogSignal(
53 pv::SigSession &session,
54 shared_ptr<Channel> channel,
55 shared_ptr<data::Analog> data) :
56 Signal(session, channel),
60 _colour = SignalColours[_channel->index() % countof(SignalColours)];
63 AnalogSignal::~AnalogSignal()
67 shared_ptr<pv::data::SignalData> AnalogSignal::data() const
72 shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
77 void AnalogSignal::set_scale(float scale)
82 void AnalogSignal::paint_back(QPainter &p, int left, int right)
84 if (_channel->enabled())
85 paint_axis(p, get_y(), left, right);
88 void AnalogSignal::paint_mid(QPainter &p, int left, int right)
91 assert(right >= left);
94 const int y = _v_offset - _view->v_offset();
96 const double scale = _view->scale();
99 const double offset = _view->offset();
101 if (!_channel->enabled())
104 const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots =
105 _data->get_snapshots();
106 if (snapshots.empty())
109 const shared_ptr<pv::data::AnalogSnapshot> &snapshot =
112 const double pixels_offset = offset / scale;
113 const double samplerate = _data->samplerate();
114 const double start_time = _data->get_start_time();
115 const int64_t last_sample = snapshot->get_sample_count() - 1;
116 const double samples_per_pixel = samplerate * scale;
117 const double start = samplerate * (offset - start_time);
118 const double end = start + samples_per_pixel * (right - left);
120 const int64_t start_sample = min(max((int64_t)floor(start),
121 (int64_t)0), last_sample);
122 const int64_t end_sample = min(max((int64_t)ceil(end) + 1,
123 (int64_t)0), last_sample);
125 if (samples_per_pixel < EnvelopeThreshold)
126 paint_trace(p, snapshot, y, left,
127 start_sample, end_sample,
128 pixels_offset, samples_per_pixel);
130 paint_envelope(p, snapshot, y, left,
131 start_sample, end_sample,
132 pixels_offset, samples_per_pixel);
135 void AnalogSignal::paint_trace(QPainter &p,
136 const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
137 int y, int left, const int64_t start, const int64_t end,
138 const double pixels_offset, const double samples_per_pixel)
140 const int64_t sample_count = end - start;
142 const float *const samples = snapshot->get_samples(start, end);
147 QPointF *points = new QPointF[sample_count];
148 QPointF *point = points;
150 for (int64_t sample = start; sample != end; sample++) {
151 const float x = (sample / samples_per_pixel -
152 pixels_offset) + left;
153 *point++ = QPointF(x,
154 y - samples[sample - start] * _scale);
157 p.drawPolyline(points, point - points);
163 void AnalogSignal::paint_envelope(QPainter &p,
164 const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
165 int y, int left, const int64_t start, const int64_t end,
166 const double pixels_offset, const double samples_per_pixel)
168 using pv::data::AnalogSnapshot;
170 AnalogSnapshot::EnvelopeSection e;
171 snapshot->get_envelope_section(e, start, end, samples_per_pixel);
176 p.setPen(QPen(Qt::NoPen));
179 QRectF *const rects = new QRectF[e.length];
180 QRectF *rect = rects;
182 for(uint64_t sample = 0; sample < e.length-1; sample++) {
183 const float x = ((e.scale * sample + e.start) /
184 samples_per_pixel - pixels_offset) + left;
185 const AnalogSnapshot::EnvelopeSample *const s =
188 // We overlap this sample with the next so that vertical
189 // gaps do not appear during steep rising or falling edges
190 const float b = y - max(s->max, (s+1)->min) * _scale;
191 const float t = y - min(s->min, (s+1)->max) * _scale;
194 if(h >= 0.0f && h <= 1.0f)
196 if(h <= 0.0f && h >= -1.0f)
199 *rect++ = QRectF(x, t, 1.0f, h);
202 p.drawRects(rects, e.length);