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.hpp"
27 #include "pv/data/analog.hpp"
28 #include "pv/data/analogsnapshot.hpp"
29 #include "pv/view/view.hpp"
31 #include <libsigrok/libsigrok.hpp>
36 using std::shared_ptr;
39 using sigrok::Channel;
44 const int AnalogSignal::NominalHeight = 80;
46 const QColor AnalogSignal::SignalColours[4] = {
47 QColor(0xC4, 0xA0, 0x00), // Yellow
48 QColor(0x87, 0x20, 0x7A), // Magenta
49 QColor(0x20, 0x4A, 0x87), // Blue
50 QColor(0x4E, 0x9A, 0x06) // Green
53 const float AnalogSignal::EnvelopeThreshold = 256.0f;
55 AnalogSignal::AnalogSignal(
57 shared_ptr<Channel> channel,
58 shared_ptr<data::Analog> data) :
59 Signal(session, channel),
63 colour_ = SignalColours[channel_->index() % countof(SignalColours)];
66 AnalogSignal::~AnalogSignal()
70 shared_ptr<pv::data::SignalData> AnalogSignal::data() const
75 shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
80 void AnalogSignal::set_scale(float scale)
85 std::pair<int, int> AnalogSignal::v_extents() const
87 return make_pair(-NominalHeight / 2, NominalHeight / 2);
90 void AnalogSignal::paint_back(QPainter &p, const RowItemPaintParams &pp)
92 if (channel_->enabled())
93 paint_axis(p, get_visual_y(), pp.left(), pp.right());
96 void AnalogSignal::paint_mid(QPainter &p, const RowItemPaintParams &pp)
101 const int y = get_visual_y();
103 const View *const view = owner_->view();
106 const double scale = view->scale();
109 const double offset = view->offset();
111 if (!channel_->enabled())
114 const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots =
115 data_->get_snapshots();
116 if (snapshots.empty())
119 const shared_ptr<pv::data::AnalogSnapshot> &snapshot =
122 const double pixels_offset = offset / scale;
123 const double samplerate = data_->samplerate();
124 const double start_time = data_->get_start_time();
125 const int64_t last_sample = snapshot->get_sample_count() - 1;
126 const double samples_per_pixel = samplerate * scale;
127 const double start = samplerate * (offset - start_time);
128 const double end = start + samples_per_pixel * pp.width();
130 const int64_t start_sample = min(max((int64_t)floor(start),
131 (int64_t)0), last_sample);
132 const int64_t end_sample = min(max((int64_t)ceil(end) + 1,
133 (int64_t)0), last_sample);
135 if (samples_per_pixel < EnvelopeThreshold)
136 paint_trace(p, snapshot, y, pp.left(),
137 start_sample, end_sample,
138 pixels_offset, samples_per_pixel);
140 paint_envelope(p, snapshot, y, pp.left(),
141 start_sample, end_sample,
142 pixels_offset, samples_per_pixel);
145 void AnalogSignal::paint_trace(QPainter &p,
146 const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
147 int y, int left, const int64_t start, const int64_t end,
148 const double pixels_offset, const double samples_per_pixel)
150 const int64_t sample_count = end - start;
152 const float *const samples = snapshot->get_samples(start, end);
157 QPointF *points = new QPointF[sample_count];
158 QPointF *point = points;
160 for (int64_t sample = start; sample != end; sample++) {
161 const float x = (sample / samples_per_pixel -
162 pixels_offset) + left;
163 *point++ = QPointF(x,
164 y - samples[sample - start] * scale_);
167 p.drawPolyline(points, point - points);
173 void AnalogSignal::paint_envelope(QPainter &p,
174 const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
175 int y, int left, const int64_t start, const int64_t end,
176 const double pixels_offset, const double samples_per_pixel)
178 using pv::data::AnalogSnapshot;
180 AnalogSnapshot::EnvelopeSection e;
181 snapshot->get_envelope_section(e, start, end, samples_per_pixel);
186 p.setPen(QPen(Qt::NoPen));
189 QRectF *const rects = new QRectF[e.length];
190 QRectF *rect = rects;
192 for(uint64_t sample = 0; sample < e.length-1; sample++) {
193 const float x = ((e.scale * sample + e.start) /
194 samples_per_pixel - pixels_offset) + left;
195 const AnalogSnapshot::EnvelopeSample *const s =
198 // We overlap this sample with the next so that vertical
199 // gaps do not appear during steep rising or falling edges
200 const float b = y - max(s->max, (s+1)->min) * scale_;
201 const float t = y - min(s->min, (s+1)->max) * scale_;
204 if(h >= 0.0f && h <= 1.0f)
206 if(h <= 0.0f && h >= -1.0f)
209 *rect++ = QRectF(x, t, 1.0f, h);
212 p.drawRects(rects, e.length);