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/analogsegment.hpp"
29 #include "pv/view/view.hpp"
31 #include <libsigrokcxx/libsigrokcxx.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 std::pair<int, int> AnalogSignal::v_extents() const
82 return make_pair(-NominalHeight / 2, NominalHeight / 2);
85 void AnalogSignal::paint_back(QPainter &p, const ViewItemPaintParams &pp)
87 if (channel_->enabled())
88 paint_axis(p, pp, get_visual_y());
91 void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
96 const int y = get_visual_y();
98 if (!channel_->enabled())
101 const deque< shared_ptr<pv::data::AnalogSegment> > &segments =
102 data_->analog_segments();
103 if (segments.empty())
106 const shared_ptr<pv::data::AnalogSegment> &segment =
109 const double pixels_offset = pp.pixels_offset();
110 const double samplerate = segment->samplerate();
111 const pv::util::Timestamp& start_time = segment->start_time();
112 const int64_t last_sample = segment->get_sample_count() - 1;
113 const double samples_per_pixel = samplerate * pp.scale();
114 const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);
115 const pv::util::Timestamp end = start + samples_per_pixel * pp.width();
117 const int64_t start_sample = min(max(floor(start).convert_to<int64_t>(),
118 (int64_t)0), last_sample);
119 const int64_t end_sample = min(max((ceil(end) + 1).convert_to<int64_t>(),
120 (int64_t)0), last_sample);
122 if (samples_per_pixel < EnvelopeThreshold)
123 paint_trace(p, segment, y, pp.left(),
124 start_sample, end_sample,
125 pixels_offset, samples_per_pixel);
127 paint_envelope(p, segment, y, pp.left(),
128 start_sample, end_sample,
129 pixels_offset, samples_per_pixel);
132 void AnalogSignal::paint_trace(QPainter &p,
133 const shared_ptr<pv::data::AnalogSegment> &segment,
134 int y, int left, const int64_t start, const int64_t end,
135 const double pixels_offset, const double samples_per_pixel)
137 const int64_t sample_count = end - start;
139 const float *const samples = segment->get_samples(start, end);
144 QPointF *points = new QPointF[sample_count];
145 QPointF *point = points;
147 for (int64_t sample = start; sample != end; sample++) {
148 const float x = (sample / samples_per_pixel -
149 pixels_offset) + left;
150 *point++ = QPointF(x,
151 y - samples[sample - start] * scale_);
154 p.drawPolyline(points, point - points);
160 void AnalogSignal::paint_envelope(QPainter &p,
161 const shared_ptr<pv::data::AnalogSegment> &segment,
162 int y, int left, const int64_t start, const int64_t end,
163 const double pixels_offset, const double samples_per_pixel)
165 using pv::data::AnalogSegment;
167 AnalogSegment::EnvelopeSection e;
168 segment->get_envelope_section(e, start, end, samples_per_pixel);
173 p.setPen(QPen(Qt::NoPen));
176 QRectF *const rects = new QRectF[e.length];
177 QRectF *rect = rects;
179 for (uint64_t sample = 0; sample < e.length-1; sample++) {
180 const float x = ((e.scale * sample + e.start) /
181 samples_per_pixel - pixels_offset) + left;
182 const AnalogSegment::EnvelopeSample *const s =
185 // We overlap this sample with the next so that vertical
186 // gaps do not appear during steep rising or falling edges
187 const float b = y - max(s->max, (s+1)->min) * scale_;
188 const float t = y - min(s->min, (s+1)->max) * scale_;
191 if (h >= 0.0f && h <= 1.0f)
193 if (h <= 0.0f && h >= -1.0f)
196 *rect++ = QRectF(x, t, 1.0f, h);
199 p.drawRects(rects, e.length);