sigview.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 "sigview.h"
  22
  23 #include "sigsession.h"
  24 #include "signal.h"
  25
  26 #include "extdef.h"
  27
  28 #include <QMouseEvent>
  29
  30 #include <math.h>
  31
  32 #include <boost/foreach.hpp>
  33
  34 using namespace boost;
  35 using namespace std;
  36
  37 const int SigView::SignalHeight = 50;
  38 const int SigView::LabelMarginWidth = 70;
  39 const int SigView::RulerHeight = 30;
  40
  41 const int SigView::ScaleUnits[3] = {1, 2, 5};
  42
  43 SigView::SigView(SigSession &session, QWidget *parent) :
  44         QGLWidget(parent),
  45         _session(session),
  46         _scale(1e-6),
  47         _offset(0)
  48 {
  49         connect(&_session, SIGNAL(dataUpdated()),
  50                 this, SLOT(dataUpdated()));
  51
  52         setMouseTracking(true);
  53         setAutoFillBackground(false);
  54 }
  55
  56 void SigView::initializeGL()
  57 {
  58 }
  59
  60 void SigView::resizeGL(int width, int height)
  61 {
  62         setupViewport(width, height);
  63 }
  64
  65 void SigView::paintEvent(QPaintEvent *event)
  66 {
  67         int offset;
  68
  69         const vector< shared_ptr<Signal> > &sigs =
  70                 _session.get_signals();
  71
  72         // Prepare for OpenGL rendering
  73         makeCurrent();
  74         glMatrixMode(GL_MODELVIEW);
  75         glPushMatrix();
  76
  77         setupViewport(width(), height());
  78
  79         qglClearColor(Qt::white);
  80         glClear(GL_COLOR_BUFFER_BIT);
  81
  82         // Plot the signal
  83         offset = RulerHeight;
  84         BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
  85         {
  86                 assert(s);
  87
  88                 const QRect signal_rect(LabelMarginWidth, offset,
  89                         width() - LabelMarginWidth, SignalHeight);
  90
  91                 s->paint(*this, signal_rect, _scale, _offset);
  92
  93                 offset += SignalHeight;
  94         }
  95
  96         // Prepare for QPainter rendering
  97         glMatrixMode(GL_MODELVIEW);
  98         glPopMatrix();
  99
 100         QPainter painter(this);
 101         painter.setRenderHint(QPainter::Antialiasing);
 102
 103         // Paint the labels
 104         offset = RulerHeight;
 105         BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
 106         {
 107                 assert(s);
 108
 109                 const QRect label_rect(0, offset,
 110                         LabelMarginWidth, SignalHeight);
 111                 s->paint_label(painter, label_rect);
 112
 113                 offset += SignalHeight;
 114         }
 115
 116         // Paint the ruler
 117         paintRuler(painter);
 118
 119         painter.end();
 120 }
 121
 122 void SigView::dataUpdated()
 123 {
 124         update();
 125 }
 126
 127 void SigView::mouseMoveEvent(QMouseEvent *event)
 128 {
 129         assert(event);
 130 }
 131
 132 void SigView::mousePressEvent(QMouseEvent *event)
 133 {
 134         assert(event);
 135 }
 136
 137 void SigView::mouseReleaseEvent(QMouseEvent *event)
 138 {
 139         assert(event);
 140
 141         const double cursor_offset = _offset + _scale * (double)event->x();
 142
 143         switch(event->button())
 144         {
 145         case Qt::LeftButton:
 146                 _scale *= 2.0 / 3.0;
 147                 break;
 148
 149         case Qt::RightButton:
 150                 _scale *= 3.0 / 2.0;
 151                 break;
 152         }
 153
 154         _offset = cursor_offset - _scale * (double)event->x();
 155
 156         update();
 157 }
 158
 159 void SigView::setupViewport(int width, int height)
 160 {
 161         glViewport(0, 0, (GLint)width, (GLint)height);
 162         glMatrixMode(GL_PROJECTION);
 163         glLoadIdentity();
 164         glOrtho(0, width, height, 0, -1, 1);
 165         glMatrixMode(GL_MODELVIEW);
 166 }
 167
 168 void SigView::paintRuler(QPainter &p)
 169 {
 170         const double MinSpacing = 20;
 171
 172         double tick_period = 0.0f;
 173         const double min_period = _scale * MinSpacing;
 174
 175         double order = 10e-15;
 176         while(tick_period < min_period)
 177         {
 178                 int unit = 0;
 179                 while(tick_period < min_period &&
 180                         unit < countof(ScaleUnits))
 181                         tick_period = order * ScaleUnits[unit++];
 182                 order *= 10;
 183         }
 184
 185         const double tick_seperation = tick_period / _scale;
 186
 187         p.setPen(Qt::transparent);
 188         p.setBrush(QColor(0xC0, 0xC0, 0xC0));
 189         p.drawRect(LabelMarginWidth, 0,
 190                 width() - LabelMarginWidth, RulerHeight);
 191
 192         p.setPen(Qt::black);
 193
 194         const double offset_ticks = -_offset / tick_period;
 195         double x = (offset_ticks - floor(offset_ticks)) *
 196                 tick_seperation + LabelMarginWidth;
 197         while(x < width())
 198         {
 199                 p.drawLine(x, 0, x, RulerHeight);
 200                 x += tick_seperation;
 201         }
 202 }