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 AnalogSignal::AnalogSignal(QString name, shared_ptr<data::Analog> data) :
42 void AnalogSignal::paint(QPainter &p, const QRect &rect, double scale,
48 const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots =
49 _data->get_snapshots();
50 if (snapshots.empty())
53 const shared_ptr<pv::data::AnalogSnapshot> &snapshot =
56 const double pixels_offset = offset / scale;
57 const double samplerate = _data->get_samplerate();
58 const double start_time = _data->get_start_time();
59 const int64_t last_sample = snapshot->get_sample_count() - 1;
60 const double samples_per_pixel = samplerate * scale;
61 const double start = samplerate * (offset - start_time);
62 const double end = start + samples_per_pixel * rect.width();
64 const int64_t start_sample = min(max((int64_t)floor(start),
65 (int64_t)0), last_sample);
66 const int64_t end_sample = min(max((int64_t)ceil(end),
67 (int64_t)0), last_sample);
69 const int y_offset = rect.center().y();
71 const float* samples = snapshot->get_samples();
74 QPointF *points = new QPointF[end_sample - start_sample];
75 QPointF *point = points;
77 for (int64_t sample = start_sample;
78 sample != end_sample; sample++) {
79 const float x = (sample / samples_per_pixel -
80 pixels_offset) + rect.left();
81 const float y = samples[sample] + y_offset;
82 *point++ = QPointF(x, y);
85 p.drawPoints(points, point - points);
90 int AnalogSignal::get_nominal_offset(const QRect &rect) const
92 return rect.center().y();