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
28 #include <QApplication>
30 #include "analogsignal.hpp"
31 #include "pv/data/analog.hpp"
32 #include "pv/data/analogsegment.hpp"
33 #include "pv/view/view.hpp"
35 #include <libsigrokcxx/libsigrokcxx.hpp>
40 using std::shared_ptr;
43 using sigrok::Channel;
48 const QColor AnalogSignal::SignalColours[4] = {
49 QColor(0xC4, 0xA0, 0x00), // Yellow
50 QColor(0x87, 0x20, 0x7A), // Magenta
51 QColor(0x20, 0x4A, 0x87), // Blue
52 QColor(0x4E, 0x9A, 0x06) // Green
55 const QColor AnalogSignal::GridMajorColor = QColor(0xB0, 0xB0, 0xB0);
56 const QColor AnalogSignal::GridMinorColor = QColor(0xD0, 0xD0, 0xD0);
58 const float AnalogSignal::EnvelopeThreshold = 256.0f;
60 AnalogSignal::AnalogSignal(
62 shared_ptr<Channel> channel,
63 shared_ptr<data::Analog> data) :
64 Signal(session, channel),
66 scale_index_(4), // 20 per div
67 scale_index_drag_offset_(0),
68 div_height_(3 * QFontMetrics(QApplication::font()).height()),
72 set_colour(SignalColours[channel_->index() % countof(SignalColours)]);
76 shared_ptr<pv::data::SignalData> AnalogSignal::data() const
81 shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
86 std::pair<int, int> AnalogSignal::v_extents() const
88 const int h = vdivs_ * div_height_;
89 return make_pair(-h, h);
92 int AnalogSignal::scale_handle_offset() const
94 const int h = vdivs_ * div_height_;
96 return ((scale_index_drag_offset_ - scale_index_) *
100 void AnalogSignal::scale_handle_dragged(int offset)
102 const int h = vdivs_ * div_height_;
104 scale_index_ = scale_index_drag_offset_ -
105 (offset + h / 2) / (h / 4);
110 void AnalogSignal::scale_handle_drag_release()
112 scale_index_drag_offset_ = scale_index_;
116 void AnalogSignal::paint_back(QPainter &p, const ViewItemPaintParams &pp)
118 if (channel_->enabled()) {
119 Trace::paint_back(p, pp);
120 paint_axis(p, pp, get_visual_y());
124 void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
129 const int y = get_visual_y();
131 if (!channel_->enabled())
134 paint_grid(p, y, pp.left(), pp.right());
136 const deque< shared_ptr<pv::data::AnalogSegment> > &segments =
137 data_->analog_segments();
138 if (segments.empty())
141 const shared_ptr<pv::data::AnalogSegment> &segment =
144 const double pixels_offset = pp.pixels_offset();
145 const double samplerate = max(1.0, segment->samplerate());
146 const pv::util::Timestamp& start_time = segment->start_time();
147 const int64_t last_sample = segment->get_sample_count() - 1;
148 const double samples_per_pixel = samplerate * pp.scale();
149 const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);
150 const pv::util::Timestamp end = start + samples_per_pixel * pp.width();
152 const int64_t start_sample = min(max(floor(start).convert_to<int64_t>(),
153 (int64_t)0), last_sample);
154 const int64_t end_sample = min(max((ceil(end) + 1).convert_to<int64_t>(),
155 (int64_t)0), last_sample);
157 if (samples_per_pixel < EnvelopeThreshold)
158 paint_trace(p, segment, y, pp.left(),
159 start_sample, end_sample,
160 pixels_offset, samples_per_pixel);
162 paint_envelope(p, segment, y, pp.left(),
163 start_sample, end_sample,
164 pixels_offset, samples_per_pixel);
167 void AnalogSignal::paint_grid(QPainter &p, int y, int left, int right)
169 p.setPen(QPen(GridMajorColor, 0.5, Qt::DashLine));
170 for (int i = 1; i <= vdivs_; i++) {
171 const int dy = i * div_height_;
172 p.drawLine(QLineF(left, y - dy, right, y - dy));
173 p.drawLine(QLineF(left, y + dy, right, y + dy));
176 p.setPen(QPen(GridMinorColor, 0.5, Qt::DashLine));
177 for (int i = 0; i < vdivs_; i++) {
178 const int dy = i * div_height_;
179 const float dy25 = dy + (0.25 * div_height_);
180 const float dy50 = dy + (0.50 * div_height_);
181 const float dy75 = dy + (0.75 * div_height_);
182 p.drawLine(QLineF(left, y - dy25, right, y - dy25));
183 p.drawLine(QLineF(left, y + dy25, right, y + dy25));
184 p.drawLine(QLineF(left, y - dy50, right, y - dy50));
185 p.drawLine(QLineF(left, y + dy50, right, y + dy50));
186 p.drawLine(QLineF(left, y - dy75, right, y - dy75));
187 p.drawLine(QLineF(left, y + dy75, right, y + dy75));
191 void AnalogSignal::paint_trace(QPainter &p,
192 const shared_ptr<pv::data::AnalogSegment> &segment,
193 int y, int left, const int64_t start, const int64_t end,
194 const double pixels_offset, const double samples_per_pixel)
196 const int64_t sample_count = end - start;
198 const float *const samples = segment->get_samples(start, end);
203 QPointF *points = new QPointF[sample_count];
204 QPointF *point = points;
206 for (int64_t sample = start; sample != end; sample++) {
207 const float x = (sample / samples_per_pixel -
208 pixels_offset) + left;
209 *point++ = QPointF(x,
210 y - samples[sample - start] * scale_);
213 p.drawPolyline(points, point - points);
219 void AnalogSignal::paint_envelope(QPainter &p,
220 const shared_ptr<pv::data::AnalogSegment> &segment,
221 int y, int left, const int64_t start, const int64_t end,
222 const double pixels_offset, const double samples_per_pixel)
224 using pv::data::AnalogSegment;
226 AnalogSegment::EnvelopeSection e;
227 segment->get_envelope_section(e, start, end, samples_per_pixel);
232 p.setPen(QPen(Qt::NoPen));
235 QRectF *const rects = new QRectF[e.length];
236 QRectF *rect = rects;
238 for (uint64_t sample = 0; sample < e.length-1; sample++) {
239 const float x = ((e.scale * sample + e.start) /
240 samples_per_pixel - pixels_offset) + left;
241 const AnalogSegment::EnvelopeSample *const s =
244 // We overlap this sample with the next so that vertical
245 // gaps do not appear during steep rising or falling edges
246 const float b = y - max(s->max, (s+1)->min) * scale_;
247 const float t = y - min(s->min, (s+1)->max) * scale_;
250 if (h >= 0.0f && h <= 1.0f)
252 if (h <= 0.0f && h >= -1.0f)
255 *rect++ = QRectF(x, t, 1.0f, h);
258 p.drawRects(rects, e.length);
264 void AnalogSignal::update_scale()
266 const float seq[] = {1.0f, 2.0f, 5.0f};
268 const int offset = std::numeric_limits<int>::max() / (2 * countof(seq));
269 const std::div_t d = std::div(
270 (int)(scale_index_ + countof(seq) * offset),
273 resolution_ = powf(10.0f, d.quot - offset) * seq[d.rem];
274 scale_ = div_height_ / resolution_;