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