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