]> sigrok.org Git - pulseview.git/blob - pv/view/analogsignal.cpp
7b49bbd2b7d454606d2ac5d51e482a331ca1b01c
[pulseview.git] / pv / view / analogsignal.cpp
1 /*
2  * This file is part of the PulseView project.
3  *
4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
5  *
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.
10  *
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.
15  *
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
19  */
20
21 #include <extdef.h>
22
23 #include <cassert>
24 #include <cmath>
25
26 #include "analogsignal.h"
27 #include "pv/data/analog.h"
28 #include "pv/data/analogsnapshot.h"
29 #include "pv/view/view.h"
30
31 #include <libsigrok/libsigrok.hpp>
32
33 using std::max;
34 using std::min;
35 using std::shared_ptr;
36 using std::deque;
37
38 using sigrok::Channel;
39
40 namespace pv {
41 namespace view {
42
43 const QColor AnalogSignal::SignalColours[4] = {
44         QColor(0xC4, 0xA0, 0x00),       // Yellow
45         QColor(0x87, 0x20, 0x7A),       // Magenta
46         QColor(0x20, 0x4A, 0x87),       // Blue
47         QColor(0x4E, 0x9A, 0x06)        // Green
48 };
49
50 const float AnalogSignal::EnvelopeThreshold = 256.0f;
51
52 AnalogSignal::AnalogSignal(shared_ptr<Channel> channel,
53         shared_ptr<data::Analog> data) :
54         Signal(channel),
55         _data(data),
56         _scale(1.0f)
57 {
58         _colour = SignalColours[_channel->index() % countof(SignalColours)];
59 }
60
61 AnalogSignal::~AnalogSignal()
62 {
63 }
64
65 shared_ptr<pv::data::SignalData> AnalogSignal::data() const
66 {
67         return _data;
68 }
69
70 shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
71 {
72         return _data;
73 }
74
75 void AnalogSignal::set_scale(float scale)
76 {
77         _scale = scale;
78 }
79
80 void AnalogSignal::paint_back(QPainter &p, int left, int right)
81 {
82         if (_channel->enabled())
83                 paint_axis(p, get_y(), left, right);
84 }
85
86 void AnalogSignal::paint_mid(QPainter &p, int left, int right)
87 {
88         assert(_data);
89         assert(right >= left);
90
91         assert(_view);
92         const int y = _v_offset - _view->v_offset();
93
94         const double scale = _view->scale();
95         assert(scale > 0);
96
97         const double offset = _view->offset();
98
99         if (!_channel->enabled())
100                 return;
101
102         const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots =
103                 _data->get_snapshots();
104         if (snapshots.empty())
105                 return;
106
107         const shared_ptr<pv::data::AnalogSnapshot> &snapshot =
108                 snapshots.front();
109
110         const double pixels_offset = offset / scale;
111         const double samplerate = _data->samplerate();
112         const double start_time = _data->get_start_time();
113         const int64_t last_sample = snapshot->get_sample_count() - 1;
114         const double samples_per_pixel = samplerate * scale;
115         const double start = samplerate * (offset - start_time);
116         const double end = start + samples_per_pixel * (right - left);
117
118         const int64_t start_sample = min(max((int64_t)floor(start),
119                 (int64_t)0), last_sample);
120         const int64_t end_sample = min(max((int64_t)ceil(end) + 1,
121                 (int64_t)0), last_sample);
122
123         if (samples_per_pixel < EnvelopeThreshold)
124                 paint_trace(p, snapshot, y, left,
125                         start_sample, end_sample,
126                         pixels_offset, samples_per_pixel);
127         else
128                 paint_envelope(p, snapshot, y, left,
129                         start_sample, end_sample,
130                         pixels_offset, samples_per_pixel);
131 }
132
133 void AnalogSignal::paint_trace(QPainter &p,
134         const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
135         int y, int left, const int64_t start, const int64_t end,
136         const double pixels_offset, const double samples_per_pixel)
137 {
138         const int64_t sample_count = end - start;
139
140         const float *const samples = snapshot->get_samples(start, end);
141         assert(samples);
142
143         p.setPen(_colour);
144
145         QPointF *points = new QPointF[sample_count];
146         QPointF *point = points;
147
148         for (int64_t sample = start; sample != end; sample++) {
149                 const float x = (sample / samples_per_pixel -
150                         pixels_offset) + left;
151                 *point++ = QPointF(x,
152                         y - samples[sample - start] * _scale);
153         }
154
155         p.drawPolyline(points, point - points);
156
157         delete[] samples;
158         delete[] points;
159 }
160
161 void AnalogSignal::paint_envelope(QPainter &p,
162         const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
163         int y, int left, const int64_t start, const int64_t end,
164         const double pixels_offset, const double samples_per_pixel)
165 {
166         using pv::data::AnalogSnapshot;
167
168         AnalogSnapshot::EnvelopeSection e;
169         snapshot->get_envelope_section(e, start, end, samples_per_pixel);
170
171         if (e.length < 2)
172                 return;
173
174         p.setPen(QPen(Qt::NoPen));
175         p.setBrush(_colour);
176
177         QRectF *const rects = new QRectF[e.length];
178         QRectF *rect = rects;
179
180         for(uint64_t sample = 0; sample < e.length-1; sample++) {
181                 const float x = ((e.scale * sample + e.start) /
182                         samples_per_pixel - pixels_offset) + left;
183                 const AnalogSnapshot::EnvelopeSample *const s =
184                         e.samples + sample;
185
186                 // We overlap this sample with the next so that vertical
187                 // gaps do not appear during steep rising or falling edges
188                 const float b = y - max(s->max, (s+1)->min) * _scale;
189                 const float t = y - min(s->min, (s+1)->max) * _scale;
190
191                 float h = b - t;
192                 if(h >= 0.0f && h <= 1.0f)
193                         h = 1.0f;
194                 if(h <= 0.0f && h >= -1.0f)
195                         h = -1.0f;
196
197                 *rect++ = QRectF(x, t, 1.0f, h);
198         }
199
200         p.drawRects(rects, e.length);
201
202         delete[] rects;
203         delete[] e.samples;
204 }
205
206 } // namespace view
207 } // namespace pv