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