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, int left, int right)
92 if (channel_->enabled())
93 paint_axis(p, get_visual_y(), left, right);
96 void AnalogSignal::paint_mid(QPainter &p, int left, int right)
99 assert(right >= left);
102 const int y = get_visual_y();
104 const View *const view = owner_->view();
107 const double scale = view->scale();
110 const double offset = view->offset();
112 if (!channel_->enabled())
115 const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots =
116 data_->get_snapshots();
117 if (snapshots.empty())
120 const shared_ptr<pv::data::AnalogSnapshot> &snapshot =
123 const double pixels_offset = offset / scale;
124 const double samplerate = data_->samplerate();
125 const double start_time = data_->get_start_time();
126 const int64_t last_sample = snapshot->get_sample_count() - 1;
127 const double samples_per_pixel = samplerate * scale;
128 const double start = samplerate * (offset - start_time);
129 const double end = start + samples_per_pixel * (right - left);
131 const int64_t start_sample = min(max((int64_t)floor(start),
132 (int64_t)0), last_sample);
133 const int64_t end_sample = min(max((int64_t)ceil(end) + 1,
134 (int64_t)0), last_sample);
136 if (samples_per_pixel < EnvelopeThreshold)
137 paint_trace(p, snapshot, y, left,
138 start_sample, end_sample,
139 pixels_offset, samples_per_pixel);
141 paint_envelope(p, snapshot, y, left,
142 start_sample, end_sample,
143 pixels_offset, samples_per_pixel);
146 void AnalogSignal::paint_trace(QPainter &p,
147 const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
148 int y, int left, const int64_t start, const int64_t end,
149 const double pixels_offset, const double samples_per_pixel)
151 const int64_t sample_count = end - start;
153 const float *const samples = snapshot->get_samples(start, end);
158 QPointF *points = new QPointF[sample_count];
159 QPointF *point = points;
161 for (int64_t sample = start; sample != end; sample++) {
162 const float x = (sample / samples_per_pixel -
163 pixels_offset) + left;
164 *point++ = QPointF(x,
165 y - samples[sample - start] * scale_);
168 p.drawPolyline(points, point - points);
174 void AnalogSignal::paint_envelope(QPainter &p,
175 const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
176 int y, int left, const int64_t start, const int64_t end,
177 const double pixels_offset, const double samples_per_pixel)
179 using pv::data::AnalogSnapshot;
181 AnalogSnapshot::EnvelopeSection e;
182 snapshot->get_envelope_section(e, start, end, samples_per_pixel);
187 p.setPen(QPen(Qt::NoPen));
190 QRectF *const rects = new QRectF[e.length];
191 QRectF *rect = rects;
193 for(uint64_t sample = 0; sample < e.length-1; sample++) {
194 const float x = ((e.scale * sample + e.start) /
195 samples_per_pixel - pixels_offset) + left;
196 const AnalogSnapshot::EnvelopeSample *const s =
199 // We overlap this sample with the next so that vertical
200 // gaps do not appear during steep rising or falling edges
201 const float b = y - max(s->max, (s+1)->min) * scale_;
202 const float t = y - min(s->min, (s+1)->max) * scale_;
205 if(h >= 0.0f && h <= 1.0f)
207 if(h <= 0.0f && h >= -1.0f)
210 *rect++ = QRectF(x, t, 1.0f, h);
213 p.drawRects(rects, e.length);