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 const float AnalogSignal::EnvelopeThreshold = 256.0f;
44 AnalogSignal::AnalogSignal(const sr_probe *const probe,
45 shared_ptr<data::Analog> data) :
50 _colour = SignalColours[probe->index % countof(SignalColours)];
53 AnalogSignal::~AnalogSignal()
57 void AnalogSignal::set_scale(float scale)
62 void AnalogSignal::paint(QPainter &p, int y, int left, int right, double scale,
67 assert(right >= left);
72 paint_axis(p, y, left, right);
74 const deque< shared_ptr<pv::data::AnalogSnapshot> > &snapshots =
75 _data->get_snapshots();
76 if (snapshots.empty())
79 const shared_ptr<pv::data::AnalogSnapshot> &snapshot =
82 const double pixels_offset = offset / scale;
83 const double samplerate = _data->get_samplerate();
84 const double start_time = _data->get_start_time();
85 const int64_t last_sample = snapshot->get_sample_count() - 1;
86 const double samples_per_pixel = samplerate * scale;
87 const double start = samplerate * (offset - start_time);
88 const double end = start + samples_per_pixel * (right - left);
90 const int64_t start_sample = min(max((int64_t)floor(start),
91 (int64_t)0), last_sample);
92 const int64_t end_sample = min(max((int64_t)ceil(end) + 1,
93 (int64_t)0), last_sample);
95 if (samples_per_pixel < EnvelopeThreshold)
96 paint_trace(p, snapshot, y, left,
97 start_sample, end_sample,
98 pixels_offset, samples_per_pixel);
100 paint_envelope(p, snapshot, y, left,
101 start_sample, end_sample,
102 pixels_offset, samples_per_pixel);
105 void AnalogSignal::paint_trace(QPainter &p,
106 const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
107 int y, int left, const int64_t start, const int64_t end,
108 const double pixels_offset, const double samples_per_pixel)
110 const int64_t sample_count = end - start;
112 const float *const samples = snapshot->get_samples(start, end);
117 QPointF *points = new QPointF[sample_count];
118 QPointF *point = points;
120 for (int64_t sample = start; sample != end; sample++) {
121 const float x = (sample / samples_per_pixel -
122 pixels_offset) + left;
123 *point++ = QPointF(x,
124 y - samples[sample - start] * _scale);
127 p.drawPolyline(points, point - points);
133 void AnalogSignal::paint_envelope(QPainter &p,
134 const shared_ptr<pv::data::AnalogSnapshot> &snapshot,
135 int y, int left, const int64_t start, const int64_t end,
136 const double pixels_offset, const double samples_per_pixel)
139 using pv::data::AnalogSnapshot;
141 AnalogSnapshot::EnvelopeSection e;
142 snapshot->get_envelope_section(e, start, end, samples_per_pixel);
147 p.setPen(QPen(NoPen));
150 QRectF *const rects = new QRectF[e.length];
151 QRectF *rect = rects;
153 for(uint64_t sample = 0; sample < e.length-1; sample++) {
154 const float x = ((e.scale * sample + e.start) /
155 samples_per_pixel - pixels_offset) + left;
156 const AnalogSnapshot::EnvelopeSample *const s =
159 // We overlap this sample with the next so that vertical
160 // gaps do not appear during steep rising or falling edges
161 const float b = y - max(s->max, (s+1)->min) * _scale;
162 const float t = y - min(s->min, (s+1)->max) * _scale;
165 if(h >= 0.0f && h <= 1.0f)
167 if(h <= 0.0f && h >= -1.0f)
170 *rect++ = QRectF(x, t, 1.0f, h);
173 p.drawRects(rects, e.length);