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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 <cassert> | |
24 | #include <cmath> | |
25 | ||
26 | #include "analogsignal.hpp" | |
27 | #include "pv/data/analog.hpp" | |
28 | #include "pv/data/analogsnapshot.hpp" | |
29 | #include "pv/view/view.hpp" | |
30 | ||
31 | #include <libsigrok/libsigrok.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, int left, int right) | |
91 | { | |
92 | if (channel_->enabled()) | |
93 | paint_axis(p, get_visual_y(), left, right); | |
94 | } | |
95 | ||
96 | void AnalogSignal::paint_mid(QPainter &p, int left, int right) | |
97 | { | |
98 | assert(data_); | |
99 | assert(right >= left); | |
100 | assert(owner_); | |
101 | ||
102 | const int y = get_visual_y(); | |
103 | ||
104 | const View *const view = owner_->view(); | |
105 | assert(view); | |
106 | ||
107 | const double scale = view->scale(); | |
108 | assert(scale > 0); | |
109 | ||
110 | const double offset = view->offset(); | |
111 | ||
112 | if (!channel_->enabled()) | |
113 | return; | |
114 | ||
115 | const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots = | |
116 | data_->get_snapshots(); | |
117 | if (snapshots.empty()) | |
118 | return; | |
119 | ||
120 | const shared_ptr<pv::data::AnalogSnapshot> &snapshot = | |
121 | snapshots.front(); | |
122 | ||
123 | const double pixels_offset = offset / scale; | |
124 | const double samplerate = data_->samplerate(); | |
125 | const double start_time = data_->get_start_time(); | |
126 | const int64_t last_sample = snapshot->get_sample_count() - 1; | |
127 | const double samples_per_pixel = samplerate * scale; | |
128 | const double start = samplerate * (offset - start_time); | |
129 | const double end = start + samples_per_pixel * (right - left); | |
130 | ||
131 | const int64_t start_sample = min(max((int64_t)floor(start), | |
132 | (int64_t)0), last_sample); | |
133 | const int64_t end_sample = min(max((int64_t)ceil(end) + 1, | |
134 | (int64_t)0), last_sample); | |
135 | ||
136 | if (samples_per_pixel < EnvelopeThreshold) | |
137 | paint_trace(p, snapshot, y, left, | |
138 | start_sample, end_sample, | |
139 | pixels_offset, samples_per_pixel); | |
140 | else | |
141 | paint_envelope(p, snapshot, y, left, | |
142 | start_sample, end_sample, | |
143 | pixels_offset, samples_per_pixel); | |
144 | } | |
145 | ||
146 | void AnalogSignal::paint_trace(QPainter &p, | |
147 | const shared_ptr<pv::data::AnalogSnapshot> &snapshot, | |
148 | int y, int left, const int64_t start, const int64_t end, | |
149 | const double pixels_offset, const double samples_per_pixel) | |
150 | { | |
151 | const int64_t sample_count = end - start; | |
152 | ||
153 | const float *const samples = snapshot->get_samples(start, end); | |
154 | assert(samples); | |
155 | ||
156 | p.setPen(colour_); | |
157 | ||
158 | QPointF *points = new QPointF[sample_count]; | |
159 | QPointF *point = points; | |
160 | ||
161 | for (int64_t sample = start; sample != end; sample++) { | |
162 | const float x = (sample / samples_per_pixel - | |
163 | pixels_offset) + left; | |
164 | *point++ = QPointF(x, | |
165 | y - samples[sample - start] * scale_); | |
166 | } | |
167 | ||
168 | p.drawPolyline(points, point - points); | |
169 | ||
170 | delete[] samples; | |
171 | delete[] points; | |
172 | } | |
173 | ||
174 | void AnalogSignal::paint_envelope(QPainter &p, | |
175 | const shared_ptr<pv::data::AnalogSnapshot> &snapshot, | |
176 | int y, int left, const int64_t start, const int64_t end, | |
177 | const double pixels_offset, const double samples_per_pixel) | |
178 | { | |
179 | using pv::data::AnalogSnapshot; | |
180 | ||
181 | AnalogSnapshot::EnvelopeSection e; | |
182 | snapshot->get_envelope_section(e, start, end, samples_per_pixel); | |
183 | ||
184 | if (e.length < 2) | |
185 | return; | |
186 | ||
187 | p.setPen(QPen(Qt::NoPen)); | |
188 | p.setBrush(colour_); | |
189 | ||
190 | QRectF *const rects = new QRectF[e.length]; | |
191 | QRectF *rect = rects; | |
192 | ||
193 | for(uint64_t sample = 0; sample < e.length-1; sample++) { | |
194 | const float x = ((e.scale * sample + e.start) / | |
195 | samples_per_pixel - pixels_offset) + left; | |
196 | const AnalogSnapshot::EnvelopeSample *const s = | |
197 | e.samples + sample; | |
198 | ||
199 | // We overlap this sample with the next so that vertical | |
200 | // gaps do not appear during steep rising or falling edges | |
201 | const float b = y - max(s->max, (s+1)->min) * scale_; | |
202 | const float t = y - min(s->min, (s+1)->max) * scale_; | |
203 | ||
204 | float h = b - t; | |
205 | if(h >= 0.0f && h <= 1.0f) | |
206 | h = 1.0f; | |
207 | if(h <= 0.0f && h >= -1.0f) | |
208 | h = -1.0f; | |
209 | ||
210 | *rect++ = QRectF(x, t, 1.0f, h); | |
211 | } | |
212 | ||
213 | p.drawRects(rects, e.length); | |
214 | ||
215 | delete[] rects; | |
216 | delete[] e.samples; | |
217 | } | |
218 | ||
219 | } // namespace view | |
220 | } // namespace pv |