Header, Viewport: Don't manually invoke on_signals_changed on construction
[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(
53         pv::SigSession &session,
54         shared_ptr<Channel> channel,
55         shared_ptr<data::Analog> data) :
56         Signal(session, channel),
57         _data(data),
58         _scale(1.0f)
59 {
60         _colour = SignalColours[_channel->index() % countof(SignalColours)];
61 }
62
63 AnalogSignal::~AnalogSignal()
64 {
65 }
66
67 shared_ptr<pv::data::SignalData> AnalogSignal::data() const
68 {
69         return _data;
70 }
71
72 shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
73 {
74         return _data;
75 }
76
77 void AnalogSignal::set_scale(float scale)
78 {
79         _scale = scale;
80 }
81
82 void AnalogSignal::paint_back(QPainter &p, int left, int right)
83 {
84         if (_channel->enabled())
85                 paint_axis(p, get_y(), left, right);
86 }
87
88 void AnalogSignal::paint_mid(QPainter &p, int left, int right)
89 {
90         assert(_data);
91         assert(right >= left);
92         assert(_owner);
93
94         const int y = get_y();
95
96         const View *const view = _owner->view();
97         assert(view);
98
99         const double scale = view->scale();
100         assert(scale > 0);
101
102         const double offset = view->offset();
103
104         if (!_channel->enabled())
105                 return;
106
107         const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots =
108                 _data->get_snapshots();
109         if (snapshots.empty())
110                 return;
111
112         const shared_ptr<pv::data::AnalogSnapshot> &snapshot =
113                 snapshots.front();
114
115         const double pixels_offset = offset / scale;
116         const double samplerate = _data->samplerate();
117         const double start_time = _data->get_start_time();
118         const int64_t last_sample = snapshot->get_sample_count() - 1;
119         const double samples_per_pixel = samplerate * scale;
120         const double start = samplerate * (offset - start_time);
121         const double end = start + samples_per_pixel * (right - left);
122
123         const int64_t start_sample = min(max((int64_t)floor(start),
124                 (int64_t)0), last_sample);
125         const int64_t end_sample = min(max((int64_t)ceil(end) + 1,
126                 (int64_t)0), last_sample);
127
128         if (samples_per_pixel < EnvelopeThreshold)
129                 paint_trace(p, snapshot, y, left,
130                         start_sample, end_sample,
131                         pixels_offset, samples_per_pixel);
132         else
133                 paint_envelope(p, snapshot, y, left,
134                         start_sample, end_sample,
135                         pixels_offset, samples_per_pixel);
136 }
137
138 void AnalogSignal::paint_trace(QPainter &p,
139         const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
140         int y, int left, const int64_t start, const int64_t end,
141         const double pixels_offset, const double samples_per_pixel)
142 {
143         const int64_t sample_count = end - start;
144
145         const float *const samples = snapshot->get_samples(start, end);
146         assert(samples);
147
148         p.setPen(_colour);
149
150         QPointF *points = new QPointF[sample_count];
151         QPointF *point = points;
152
153         for (int64_t sample = start; sample != end; sample++) {
154                 const float x = (sample / samples_per_pixel -
155                         pixels_offset) + left;
156                 *point++ = QPointF(x,
157                         y - samples[sample - start] * _scale);
158         }
159
160         p.drawPolyline(points, point - points);
161
162         delete[] samples;
163         delete[] points;
164 }
165
166 void AnalogSignal::paint_envelope(QPainter &p,
167         const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
168         int y, int left, const int64_t start, const int64_t end,
169         const double pixels_offset, const double samples_per_pixel)
170 {
171         using pv::data::AnalogSnapshot;
172
173         AnalogSnapshot::EnvelopeSection e;
174         snapshot->get_envelope_section(e, start, end, samples_per_pixel);
175
176         if (e.length < 2)
177                 return;
178
179         p.setPen(QPen(Qt::NoPen));
180         p.setBrush(_colour);
181
182         QRectF *const rects = new QRectF[e.length];
183         QRectF *rect = rects;
184
185         for(uint64_t sample = 0; sample < e.length-1; sample++) {
186                 const float x = ((e.scale * sample + e.start) /
187                         samples_per_pixel - pixels_offset) + left;
188                 const AnalogSnapshot::EnvelopeSample *const s =
189                         e.samples + sample;
190
191                 // We overlap this sample with the next so that vertical
192                 // gaps do not appear during steep rising or falling edges
193                 const float b = y - max(s->max, (s+1)->min) * _scale;
194                 const float t = y - min(s->min, (s+1)->max) * _scale;
195
196                 float h = b - t;
197                 if(h >= 0.0f && h <= 1.0f)
198                         h = 1.0f;
199                 if(h <= 0.0f && h >= -1.0f)
200                         h = -1.0f;
201
202                 *rect++ = QRectF(x, t, 1.0f, h);
203         }
204
205         p.drawRects(rects, e.length);
206
207         delete[] rects;
208         delete[] e.samples;
209 }
210
211 } // namespace view
212 } // namespace pv