pv/view/logicsignal.cpp

   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 "logicsignal.h"
  26 #include "view.h"
  27 #include "pv/data/logic.h"
  28 #include "pv/data/logicsnapshot.h"
  29
  30 using namespace boost;
  31 using namespace std;
  32
  33 namespace pv {
  34 namespace view {
  35
  36 const float LogicSignal::Oversampling = 2.0f;
  37
  38 const QColor LogicSignal::EdgeColour(0x80, 0x80, 0x80);
  39 const QColor LogicSignal::HighColour(0x00, 0xC0, 0x00);
  40 const QColor LogicSignal::LowColour(0xC0, 0x00, 0x00);
  41
  42 const QColor LogicSignal::SignalColours[10] = {
  43         QColor(0x16, 0x19, 0x1A),       // Black
  44         QColor(0x8F, 0x52, 0x02),       // Brown
  45         QColor(0xCC, 0x00, 0x00),       // Red
  46         QColor(0xF5, 0x79, 0x00),       // Orange
  47         QColor(0xED, 0xD4, 0x00),       // Yellow
  48         QColor(0x73, 0xD2, 0x16),       // Green
  49         QColor(0x34, 0x65, 0xA4),       // Blue
  50         QColor(0x75, 0x50, 0x7B),       // Violet
  51         QColor(0x88, 0x8A, 0x85),       // Grey
  52         QColor(0xEE, 0xEE, 0xEC),       // White
  53 };
  54
  55 LogicSignal::LogicSignal(QString name, shared_ptr<data::Logic> data,
  56         int probe_index) :
  57         Signal(name),
  58         _probe_index(probe_index),
  59         _data(data)
  60 {
  61         assert(_probe_index >= 0);
  62         _colour = SignalColours[_probe_index % countof(SignalColours)];
  63 }
  64
  65 void LogicSignal::paint(QPainter &p, int y, int left, int right,
  66                 double scale, double offset)
  67 {
  68         using pv::view::View;
  69
  70         QLineF *line;
  71
  72         vector< pair<int64_t, bool> > edges;
  73
  74         assert(scale > 0);
  75         assert(_data);
  76         assert(right >= left);
  77
  78         paint_axis(p, y, left, right);
  79
  80         const float high_offset = y - View::SignalHeight + 0.5f;
  81         const float low_offset = y + 0.5f;
  82
  83         const deque< shared_ptr<pv::data::LogicSnapshot> > &snapshots =
  84                 _data->get_snapshots();
  85         if (snapshots.empty())
  86                 return;
  87
  88         const shared_ptr<pv::data::LogicSnapshot> &snapshot =
  89                 snapshots.front();
  90
  91         double samplerate = _data->get_samplerate();
  92
  93         // Show sample rate as 1Hz when it is unknown
  94         if (samplerate == 0.0)
  95                 samplerate = 1.0;
  96
  97         const double pixels_offset = offset / scale;
  98         const double start_time = _data->get_start_time();
  99         const int64_t last_sample = snapshot->get_sample_count() - 1;
 100         const double samples_per_pixel = samplerate * scale;
 101         const double start = samplerate * (offset - start_time);
 102         const double end = start + samples_per_pixel * (right - left);
 103
 104         snapshot->get_subsampled_edges(edges,
 105                 min(max((int64_t)floor(start), (int64_t)0), last_sample),
 106                 min(max((int64_t)ceil(end), (int64_t)0), last_sample),
 107                 samples_per_pixel / Oversampling, _probe_index);
 108         assert(edges.size() >= 2);
 109
 110         // Paint the edges
 111         const unsigned int edge_count = edges.size() - 2;
 112         QLineF *const edge_lines = new QLineF[edge_count];
 113         line = edge_lines;
 114
 115         for (vector<pv::data::LogicSnapshot::EdgePair>::const_iterator i =
 116                         edges.begin() + 1;
 117                 i != edges.end() - 1; i++) {
 118                 const float x = ((*i).first / samples_per_pixel -
 119                         pixels_offset) + left;
 120                 *line++ = QLineF(x, high_offset, x, low_offset);
 121         }
 122
 123         p.setPen(EdgeColour);
 124         p.drawLines(edge_lines, edge_count);
 125         delete[] edge_lines;
 126
 127         // Paint the caps
 128         const unsigned int max_cap_line_count = (edges.size() - 1);
 129         QLineF *const cap_lines = new QLineF[max_cap_line_count];
 130
 131         p.setPen(HighColour);
 132         paint_caps(p, cap_lines, edges, true, samples_per_pixel,
 133                 pixels_offset, left, high_offset);
 134         p.setPen(LowColour);
 135         paint_caps(p, cap_lines, edges, false, samples_per_pixel,
 136                 pixels_offset, left, low_offset);
 137
 138         delete[] cap_lines;
 139 }
 140
 141 void LogicSignal::paint_caps(QPainter &p, QLineF *const lines,
 142         vector< pair<int64_t, bool> > &edges, bool level,
 143         double samples_per_pixel, double pixels_offset, float x_offset,
 144         float y_offset)
 145 {
 146         QLineF *line = lines;
 147
 148         for (vector<pv::data::LogicSnapshot::EdgePair>::const_iterator i =
 149                 edges.begin(); i != (edges.end() - 1); i++)
 150                 if ((*i).second == level) {
 151                         *line++ = QLineF(
 152                                 ((*i).first / samples_per_pixel -
 153                                         pixels_offset) + x_offset, y_offset,
 154                                 ((*(i+1)).first / samples_per_pixel -
 155                                         pixels_offset) + x_offset, y_offset);
 156                 }
 157
 158         p.drawLines(lines, line - lines);
 159 }
 160
 161 } // namespace view
 162 } // namespace pv