MainWindow: Added format parameters to load_file
[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.hpp"
27 #include "pv/data/analog.hpp"
28 #include "pv/data/analogsegment.hpp"
29 #include "pv/view/view.hpp"
30
31 #include <libsigrokcxx/libsigrokcxx.hpp>
32
33 using std::max;
34 using std::make_pair;
35 using std::min;
36 using std::shared_ptr;
37 using std::deque;
38
39 using sigrok::Channel;
40
41 namespace pv {
42 namespace view {
43
44 const int AnalogSignal::NominalHeight = 80;
45
46 const QColor AnalogSignal::SignalColours[4] = {
47         QColor(0xC4, 0xA0, 0x00),       // Yellow
48         QColor(0x87, 0x20, 0x7A),       // Magenta
49         QColor(0x20, 0x4A, 0x87),       // Blue
50         QColor(0x4E, 0x9A, 0x06)        // Green
51 };
52
53 const float AnalogSignal::EnvelopeThreshold = 256.0f;
54
55 AnalogSignal::AnalogSignal(
56         pv::Session &session,
57         shared_ptr<Channel> channel,
58         shared_ptr<data::Analog> data) :
59         Signal(session, channel),
60         data_(data),
61         scale_(1.0f)
62 {
63         colour_ = SignalColours[channel_->index() % countof(SignalColours)];
64 }
65
66 AnalogSignal::~AnalogSignal()
67 {
68 }
69
70 shared_ptr<pv::data::SignalData> AnalogSignal::data() const
71 {
72         return data_;
73 }
74
75 shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
76 {
77         return data_;
78 }
79
80 void AnalogSignal::set_scale(float scale)
81 {
82         scale_ = scale;
83 }
84
85 std::pair<int, int> AnalogSignal::v_extents() const
86 {
87         return make_pair(-NominalHeight / 2, NominalHeight / 2);
88 }
89
90 void AnalogSignal::paint_back(QPainter &p, const ViewItemPaintParams &pp)
91 {
92         if (channel_->enabled())
93                 paint_axis(p, pp, get_visual_y());
94 }
95
96 void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
97 {
98         assert(data_);
99         assert(owner_);
100
101         const int y = get_visual_y();
102
103         if (!channel_->enabled())
104                 return;
105
106         const deque< shared_ptr<pv::data::AnalogSegment> > &segments =
107                 data_->analog_segments();
108         if (segments.empty())
109                 return;
110
111         const shared_ptr<pv::data::AnalogSegment> &segment =
112                 segments.front();
113
114         const double pixels_offset = pp.pixels_offset();
115         const double samplerate = segment->samplerate();
116         const double start_time = segment->start_time();
117         const int64_t last_sample = segment->get_sample_count() - 1;
118         const double samples_per_pixel = samplerate * pp.scale();
119         const double start = samplerate * (pp.offset() - start_time);
120         const double end = start + samples_per_pixel * pp.width();
121
122         const int64_t start_sample = min(max((int64_t)floor(start),
123                 (int64_t)0), last_sample);
124         const int64_t end_sample = min(max((int64_t)ceil(end) + 1,
125                 (int64_t)0), last_sample);
126
127         if (samples_per_pixel < EnvelopeThreshold)
128                 paint_trace(p, segment, y, pp.left(),
129                         start_sample, end_sample,
130                         pixels_offset, samples_per_pixel);
131         else
132                 paint_envelope(p, segment, y, pp.left(),
133                         start_sample, end_sample,
134                         pixels_offset, samples_per_pixel);
135 }
136
137 void AnalogSignal::paint_trace(QPainter &p,
138         const shared_ptr<pv::data::AnalogSegment> &segment,
139         int y, int left, const int64_t start, const int64_t end,
140         const double pixels_offset, const double samples_per_pixel)
141 {
142         const int64_t sample_count = end - start;
143
144         const float *const samples = segment->get_samples(start, end);
145         assert(samples);
146
147         p.setPen(colour_);
148
149         QPointF *points = new QPointF[sample_count];
150         QPointF *point = points;
151
152         for (int64_t sample = start; sample != end; sample++) {
153                 const float x = (sample / samples_per_pixel -
154                         pixels_offset) + left;
155                 *point++ = QPointF(x,
156                         y - samples[sample - start] * scale_);
157         }
158
159         p.drawPolyline(points, point - points);
160
161         delete[] samples;
162         delete[] points;
163 }
164
165 void AnalogSignal::paint_envelope(QPainter &p,
166         const shared_ptr<pv::data::AnalogSegment> &segment,
167         int y, int left, const int64_t start, const int64_t end,
168         const double pixels_offset, const double samples_per_pixel)
169 {
170         using pv::data::AnalogSegment;
171
172         AnalogSegment::EnvelopeSection e;
173         segment->get_envelope_section(e, start, end, samples_per_pixel);
174
175         if (e.length < 2)
176                 return;
177
178         p.setPen(QPen(Qt::NoPen));
179         p.setBrush(colour_);
180
181         QRectF *const rects = new QRectF[e.length];
182         QRectF *rect = rects;
183
184         for(uint64_t sample = 0; sample < e.length-1; sample++) {
185                 const float x = ((e.scale * sample + e.start) /
186                         samples_per_pixel - pixels_offset) + left;
187                 const AnalogSegment::EnvelopeSample *const s =
188                         e.samples + sample;
189
190                 // We overlap this sample with the next so that vertical
191                 // gaps do not appear during steep rising or falling edges
192                 const float b = y - max(s->max, (s+1)->min) * scale_;
193                 const float t = y - min(s->min, (s+1)->max) * scale_;
194
195                 float h = b - t;
196                 if(h >= 0.0f && h <= 1.0f)
197                         h = 1.0f;
198                 if(h <= 0.0f && h >= -1.0f)
199                         h = -1.0f;
200
201                 *rect++ = QRectF(x, t, 1.0f, h);
202         }
203
204         p.drawRects(rects, e.length);
205
206         delete[] rects;
207         delete[] e.samples;
208 }
209
210 } // namespace view
211 } // namespace pv