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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 | ||
29 | using namespace boost; | |
30 | using namespace std; | |
31 | ||
32 | namespace pv { | |
33 | namespace view { | |
34 | ||
35 | AnalogSignal::AnalogSignal(QString name, shared_ptr<data::Analog> data) : | |
36 | Signal(name), | |
37 | _data(data) | |
38 | { | |
39 | _colour = Qt::blue; | |
40 | } | |
41 | ||
42 | void AnalogSignal::paint(QPainter &p, int y, int left, int right, double scale, | |
43 | double offset) | |
44 | { | |
45 | assert(scale > 0); | |
46 | assert(_data); | |
47 | assert(right >= left); | |
48 | ||
49 | paint_axis(p, y, left, right); | |
50 | ||
51 | const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots = | |
52 | _data->get_snapshots(); | |
53 | if (snapshots.empty()) | |
54 | return; | |
55 | ||
56 | const shared_ptr<pv::data::AnalogSnapshot> &snapshot = | |
57 | snapshots.front(); | |
58 | ||
59 | const double pixels_offset = offset / scale; | |
60 | const double samplerate = _data->get_samplerate(); | |
61 | const double start_time = _data->get_start_time(); | |
62 | const int64_t last_sample = snapshot->get_sample_count() - 1; | |
63 | const double samples_per_pixel = samplerate * scale; | |
64 | const double start = samplerate * (offset - start_time); | |
65 | const double end = start + samples_per_pixel * (right - left); | |
66 | ||
67 | const int64_t start_sample = min(max((int64_t)floor(start), | |
68 | (int64_t)0), last_sample); | |
69 | const int64_t end_sample = min(max((int64_t)ceil(end), | |
70 | (int64_t)0), last_sample); | |
71 | ||
72 | const float* samples = snapshot->get_samples(); | |
73 | assert(samples); | |
74 | ||
75 | QPointF *points = new QPointF[end_sample - start_sample]; | |
76 | QPointF *point = points; | |
77 | ||
78 | for (int64_t sample = start_sample; | |
79 | sample != end_sample; sample++) { | |
80 | const float x = (sample / samples_per_pixel - | |
81 | pixels_offset) + left; | |
82 | *point++ = QPointF(x, samples[sample] + y); | |
83 | } | |
84 | ||
85 | p.drawPoints(points, point - points); | |
86 | ||
87 | delete[] points; | |
88 | } | |
89 | ||
90 | } // namespace view | |
91 | } // namespace pv |