logicsignal.cpp

   1 /*
   2  * This file is part of the sigrok 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 <math.h>
  22
  23 #include "extdef.h"
  24
  25 #include "logicdata.h"
  26 #include "logicdatasnapshot.h"
  27 #include "logicsignal.h"
  28
  29 using namespace boost;
  30 using namespace std;
  31
  32 const float LogicSignal::Margin = 10.0f;
  33
  34 const QColor LogicSignal::EdgeColour(0x80, 0x80, 0x80);
  35 const QColor LogicSignal::HighColour(0x00, 0xC0, 0x00);
  36 const QColor LogicSignal::LowColour(0xC0, 0x00, 0x00);
  37
  38 const QColor LogicSignal::LogicSignalColours[10] = {
  39         QColor(0x16, 0x19, 0x1A),       // Black
  40         QColor(0x8F, 0x52, 0x02),       // Brown
  41         QColor(0xCC, 0x00, 0x00),       // Red
  42         QColor(0xF5, 0x79, 0x00),       // Orange
  43         QColor(0xED, 0xD4, 0x00),       // Yellow
  44         QColor(0x73, 0xD2, 0x16),       // Green
  45         QColor(0x34, 0x65, 0xA4),       // Blue
  46         QColor(0x75, 0x50, 0x7B),       // Violet
  47         QColor(0x88, 0x8A, 0x85),       // Grey
  48         QColor(0xEE, 0xEE, 0xEC),       // White
  49 };
  50
  51 LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data,
  52         int probe_index) :
  53         Signal(name),
  54         _data(data),
  55         _probe_index(probe_index)
  56 {
  57         assert(_probe_index >= 0);
  58 }
  59
  60 void LogicSignal::paint(QPainter &p, const QRect &rect, double scale,
  61         double offset)
  62 {
  63         QLineF *line;
  64
  65         vector< pair<int64_t, bool> > edges;
  66
  67         assert(scale > 0);
  68         assert(_data);
  69
  70         const float high_offset = rect.top() + Margin;
  71         const float low_offset = rect.bottom() - Margin;
  72
  73         const deque< shared_ptr<LogicDataSnapshot> > &snapshots =
  74                 _data->get_snapshots();
  75         if(snapshots.empty())
  76                 return;
  77
  78         const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front();
  79
  80         const double pixels_offset = offset / scale;
  81         const double samplerate = _data->get_samplerate();
  82         const double start_time = _data->get_start_time();
  83         const int64_t last_sample = snapshot->get_sample_count() - 1;
  84         const double samples_per_pixel = samplerate * scale;
  85         const double start = samplerate * (offset - start_time);
  86         const double end = start + samples_per_pixel * rect.width();
  87
  88         snapshot->get_subsampled_edges(edges,
  89                 min(max((int64_t)floor(start), (int64_t)0), last_sample),
  90                 min(max((int64_t)ceil(end), (int64_t)0), last_sample),
  91                 samples_per_pixel, _probe_index);
  92         assert(edges.size() >= 2);
  93
  94         // Paint the edges
  95         const unsigned int edge_count = edges.size() - 2;
  96         QLineF *const edge_lines = new QLineF[edge_count];
  97         line = edge_lines;
  98
  99         for(vector<LogicDataSnapshot::EdgePair>::const_iterator i =
 100                         edges.begin() + 1;
 101                 i != edges.end() - 1; i++) {
 102                 const int x = (int)((*i).first / samples_per_pixel -
 103                         pixels_offset) + rect.left();
 104                 *line++ = QLineF(x, high_offset, x, low_offset);
 105         }
 106
 107         p.setPen(EdgeColour);
 108         p.drawLines(edge_lines, edge_count);
 109         delete[] edge_lines;
 110
 111         // Paint the caps
 112         const unsigned int max_cap_line_count = (edges.size() - 1);
 113         QLineF *const cap_lines = new QLineF[max_cap_line_count];
 114
 115         p.setPen(HighColour);
 116         paint_caps(p, cap_lines, edges, true, samples_per_pixel,
 117                 pixels_offset, rect.left(), high_offset);
 118         p.setPen(LowColour);
 119         paint_caps(p, cap_lines, edges, false, samples_per_pixel,
 120                 pixels_offset, rect.left(), low_offset);
 121
 122         delete[] cap_lines;
 123 }
 124
 125 int LogicSignal::paint_caps(QPainter &p, QLineF *const lines,
 126         vector< pair<int64_t, bool> > &edges, bool level,
 127         double samples_per_pixel, double pixels_offset, int x_offset,
 128         int y_offset)
 129 {
 130         QLineF *line = lines;
 131
 132         for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin();
 133             i != (edges.end() - 1); i++)
 134                 if((*i).second == level) {
 135                         *line++ = QLineF(
 136                                 (int)((*i).first / samples_per_pixel -
 137                                         pixels_offset) + x_offset, y_offset,
 138                                 (int)((*(i+1)).first / samples_per_pixel -
 139                                         pixels_offset) + x_offset, y_offset);
 140                 }
 141
 142         p.drawLines(lines, line - lines);
 143 }
 144
 145 QColor LogicSignal::get_colour() const
 146 {
 147         return LogicSignalColours[_probe_index % countof(LogicSignalColours)];
 148 }
 149
 150 int LogicSignal::get_nominal_offset(const QRect &rect) const
 151 {
 152         return rect.bottom() - Margin;
 153 }