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 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 ViewItemPaintParams &pp)
92 if (channel_->enabled())
93 paint_axis(p, pp, get_visual_y());
96 void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
101 const int y = get_visual_y();
103 if (!channel_->enabled())
106 const deque< shared_ptr<pv::data::AnalogSegment> > &segments =
107 data_->analog_segments();
108 if (segments.empty())
111 const shared_ptr<pv::data::AnalogSegment> &segment =
114 const double pixels_offset = pp.pixels_offset();
115 const double samplerate = segment->samplerate();
116 const double start_time = segment->start_time();
117 const int64_t last_sample = segment->get_sample_count() - 1;
118 const double samples_per_pixel = samplerate * pp.scale();
119 const double start = samplerate * (pp.offset() - start_time);
120 const double end = start + samples_per_pixel * pp.width();
122 const int64_t start_sample = min(max((int64_t)floor(start),
123 (int64_t)0), last_sample);
124 const int64_t end_sample = min(max((int64_t)ceil(end) + 1,
125 (int64_t)0), last_sample);
127 if (samples_per_pixel < EnvelopeThreshold)
128 paint_trace(p, segment, y, pp.left(),
129 start_sample, end_sample,
130 pixels_offset, samples_per_pixel);
132 paint_envelope(p, segment, y, pp.left(),
133 start_sample, end_sample,
134 pixels_offset, samples_per_pixel);
137 void AnalogSignal::paint_trace(QPainter &p,
138 const shared_ptr<pv::data::AnalogSegment> &segment,
139 int y, int left, const int64_t start, const int64_t end,
140 const double pixels_offset, const double samples_per_pixel)
142 const int64_t sample_count = end - start;
144 const float *const samples = segment->get_samples(start, end);
149 QPointF *points = new QPointF[sample_count];
150 QPointF *point = points;
152 for (int64_t sample = start; sample != end; sample++) {
153 const float x = (sample / samples_per_pixel -
154 pixels_offset) + left;
155 *point++ = QPointF(x,
156 y - samples[sample - start] * scale_);
159 p.drawPolyline(points, point - points);
165 void AnalogSignal::paint_envelope(QPainter &p,
166 const shared_ptr<pv::data::AnalogSegment> &segment,
167 int y, int left, const int64_t start, const int64_t end,
168 const double pixels_offset, const double samples_per_pixel)
170 using pv::data::AnalogSegment;
172 AnalogSegment::EnvelopeSection e;
173 segment->get_envelope_section(e, start, end, samples_per_pixel);
178 p.setPen(QPen(Qt::NoPen));
181 QRectF *const rects = new QRectF[e.length];
182 QRectF *rect = rects;
184 for(uint64_t sample = 0; sample < e.length-1; sample++) {
185 const float x = ((e.scale * sample + e.start) /
186 samples_per_pixel - pixels_offset) + left;
187 const AnalogSegment::EnvelopeSample *const s =
190 // We overlap this sample with the next so that vertical
191 // gaps do not appear during steep rising or falling edges
192 const float b = y - max(s->max, (s+1)->min) * scale_;
193 const float t = y - min(s->min, (s+1)->max) * scale_;
196 if(h >= 0.0f && h <= 1.0f)
198 if(h <= 0.0f && h >= -1.0f)
201 *rect++ = QRectF(x, t, 1.0f, h);
204 p.drawRects(rects, e.length);