2 * This file is part of the PulseView project.
4 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
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.
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.
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
25 #include "analogsignal.h"
26 #include "pv/data/analog.h"
27 #include "pv/data/analogsnapshot.h"
29 using namespace boost;
35 const QColor AnalogSignal::SignalColours[4] = {
36 QColor(0xC4, 0xA0, 0x00), // Yellow
37 QColor(0x87, 0x20, 0x7A), // Magenta
38 QColor(0x20, 0x4A, 0x87), // Blue
39 QColor(0x4E, 0x9A, 0x06) // Green
42 AnalogSignal::AnalogSignal(QString name, shared_ptr<data::Analog> data,
47 _colour = SignalColours[probe_index % countof(SignalColours)];
50 void AnalogSignal::paint(QPainter &p, int y, int left, int right, double scale,
55 assert(right >= left);
57 paint_axis(p, y, left, right);
59 const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots =
60 _data->get_snapshots();
61 if (snapshots.empty())
64 const shared_ptr<pv::data::AnalogSnapshot> &snapshot =
67 const double pixels_offset = offset / scale;
68 const double samplerate = _data->get_samplerate();
69 const double start_time = _data->get_start_time();
70 const int64_t last_sample = snapshot->get_sample_count() - 1;
71 const double samples_per_pixel = samplerate * scale;
72 const double start = samplerate * (offset - start_time);
73 const double end = start + samples_per_pixel * (right - left);
75 const int64_t start_sample = min(max((int64_t)floor(start),
76 (int64_t)0), last_sample);
77 const int64_t end_sample = min(max((int64_t)ceil(end),
78 (int64_t)0), last_sample);
79 const int64_t sample_count = end_sample - start_sample;
81 const float* samples = snapshot->get_samples(
82 start_sample, end_sample);
85 QPointF *points = new QPointF[sample_count];
86 QPointF *point = points;
88 for (int64_t sample = start_sample;
89 sample != end_sample; sample++) {
90 const float x = (sample / samples_per_pixel -
91 pixels_offset) + left;
93 samples[sample - start_sample] + y);
97 p.drawPoints(points, point - points);