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