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