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