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 "analogsignal.hpp"
29 #include "pv/data/analog.hpp"
30 #include "pv/data/analogsegment.hpp"
31 #include "pv/view/view.hpp"
33 #include <libsigrokcxx/libsigrokcxx.hpp>
38 using std::shared_ptr;
41 using sigrok::Channel;
46 const int AnalogSignal::NominalHeight = 80;
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 float AnalogSignal::EnvelopeThreshold = 256.0f;
57 AnalogSignal::AnalogSignal(
59 shared_ptr<Channel> channel,
60 shared_ptr<data::Analog> data) :
61 Signal(session, channel),
64 scale_index_drag_offset_(0)
66 set_colour(SignalColours[channel_->index() % countof(SignalColours)]);
69 AnalogSignal::~AnalogSignal()
73 shared_ptr<pv::data::SignalData> AnalogSignal::data() const
78 shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
83 std::pair<int, int> AnalogSignal::v_extents() const
85 const int h = NominalHeight / 2;
86 return make_pair(-h, h);
89 int AnalogSignal::scale_handle_offset() const
91 return ((scale_index_drag_offset_ - scale_index_) *
92 NominalHeight / 4) - NominalHeight / 2;
95 void AnalogSignal::scale_handle_dragged(int offset)
97 scale_index_ = scale_index_drag_offset_ -
98 (offset + NominalHeight / 2) / (NominalHeight / 4);
101 void AnalogSignal::scale_handle_drag_release()
103 scale_index_drag_offset_ = scale_index_;
106 void AnalogSignal::paint_back(QPainter &p, const ViewItemPaintParams &pp)
108 if (channel_->enabled()) {
109 Trace::paint_back(p, pp);
110 paint_axis(p, pp, get_visual_y());
114 void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
119 const int y = get_visual_y();
121 if (!channel_->enabled())
124 const deque< shared_ptr<pv::data::AnalogSegment> > &segments =
125 data_->analog_segments();
126 if (segments.empty())
129 const shared_ptr<pv::data::AnalogSegment> &segment =
132 const double pixels_offset = pp.pixels_offset();
133 const double samplerate = max(1.0, segment->samplerate());
134 const pv::util::Timestamp& start_time = segment->start_time();
135 const int64_t last_sample = segment->get_sample_count() - 1;
136 const double samples_per_pixel = samplerate * pp.scale();
137 const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);
138 const pv::util::Timestamp end = start + samples_per_pixel * pp.width();
140 const int64_t start_sample = min(max(floor(start).convert_to<int64_t>(),
141 (int64_t)0), last_sample);
142 const int64_t end_sample = min(max((ceil(end) + 1).convert_to<int64_t>(),
143 (int64_t)0), last_sample);
145 if (samples_per_pixel < EnvelopeThreshold)
146 paint_trace(p, segment, y, pp.left(),
147 start_sample, end_sample,
148 pixels_offset, samples_per_pixel);
150 paint_envelope(p, segment, y, pp.left(),
151 start_sample, end_sample,
152 pixels_offset, samples_per_pixel);
155 void AnalogSignal::paint_trace(QPainter &p,
156 const shared_ptr<pv::data::AnalogSegment> &segment,
157 int y, int left, const int64_t start, const int64_t end,
158 const double pixels_offset, const double samples_per_pixel)
160 const float scale = this->scale();
161 const int64_t sample_count = end - start;
163 const float *const samples = segment->get_samples(start, end);
168 QPointF *points = new QPointF[sample_count];
169 QPointF *point = points;
171 for (int64_t sample = start; sample != end; sample++) {
172 const float x = (sample / samples_per_pixel -
173 pixels_offset) + left;
174 *point++ = QPointF(x,
175 y - samples[sample - start] * scale);
178 p.drawPolyline(points, point - points);
184 void AnalogSignal::paint_envelope(QPainter &p,
185 const shared_ptr<pv::data::AnalogSegment> &segment,
186 int y, int left, const int64_t start, const int64_t end,
187 const double pixels_offset, const double samples_per_pixel)
189 using pv::data::AnalogSegment;
191 const float scale = this->scale();
193 AnalogSegment::EnvelopeSection e;
194 segment->get_envelope_section(e, start, end, samples_per_pixel);
199 p.setPen(QPen(Qt::NoPen));
202 QRectF *const rects = new QRectF[e.length];
203 QRectF *rect = rects;
205 for (uint64_t sample = 0; sample < e.length-1; sample++) {
206 const float x = ((e.scale * sample + e.start) /
207 samples_per_pixel - pixels_offset) + left;
208 const AnalogSegment::EnvelopeSample *const s =
211 // We overlap this sample with the next so that vertical
212 // gaps do not appear during steep rising or falling edges
213 const float b = y - max(s->max, (s+1)->min) * scale;
214 const float t = y - min(s->min, (s+1)->max) * scale;
217 if (h >= 0.0f && h <= 1.0f)
219 if (h <= 0.0f && h >= -1.0f)
222 *rect++ = QRectF(x, t, 1.0f, h);
225 p.drawRects(rects, e.length);
231 float AnalogSignal::scale() const
233 const float seq[] = {1.0f, 2.0f, 5.0f};
234 const int offset = std::numeric_limits<int>::max() / (2 * countof(seq));
235 const std::div_t d = std::div(
236 (int)(scale_index_ + countof(seq) * offset),
238 return powf(10.0f, d.quot - offset) * seq[d.rem];