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 #include <QTextStream>
  30
  31 #include <math.h>
  32
  33 #include <boost/foreach.hpp>
  34
  35 using namespace boost;
  36 using namespace std;
  37
  38 const int SigView::SignalHeight = 50;
  39 const int SigView::LabelMarginWidth = 70;
  40 const int SigView::RulerHeight = 30;
  41
  42 const int SigView::ScaleUnits[3] = {1, 2, 5};
  43
  44 const QString SigView::SIPrefixes[9] =
  45         {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"};
  46 const int SigView::FirstSIPrefixPower = -15;
  47
  48 SigView::SigView(SigSession &session, QWidget *parent) :
  49         QGLWidget(parent),
  50         _session(session),
  51         _scale(1e-6),
  52         _offset(0)
  53 {
  54         connect(&_session, SIGNAL(dataUpdated()),
  55                 this, SLOT(dataUpdated()));
  56
  57         setMouseTracking(true);
  58         setAutoFillBackground(false);
  59 }
  60
  61 void SigView::initializeGL()
  62 {
  63 }
  64
  65 void SigView::resizeGL(int width, int height)
  66 {
  67         setupViewport(width, height);
  68 }
  69
  70 void SigView::paintEvent(QPaintEvent *event)
  71 {
  72         int offset;
  73
  74         const vector< shared_ptr<Signal> > &sigs =
  75                 _session.get_signals();
  76
  77         // Prepare for OpenGL rendering
  78         makeCurrent();
  79         glMatrixMode(GL_MODELVIEW);
  80         glPushMatrix();
  81
  82         setupViewport(width(), height());
  83
  84         qglClearColor(Qt::white);
  85         glClear(GL_COLOR_BUFFER_BIT);
  86
  87         // Plot the signal
  88         offset = RulerHeight;
  89         BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
  90         {
  91                 assert(s);
  92
  93                 const QRect signal_rect(LabelMarginWidth, offset,
  94                         width() - LabelMarginWidth, SignalHeight);
  95
  96                 s->paint(*this, signal_rect, _scale, _offset);
  97
  98                 offset += SignalHeight;
  99         }
 100
 101         // Prepare for QPainter rendering
 102         glMatrixMode(GL_MODELVIEW);
 103         glPopMatrix();
 104
 105         QPainter painter(this);
 106         painter.setRenderHint(QPainter::Antialiasing);
 107
 108         // Paint the labels
 109         offset = RulerHeight;
 110         BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
 111         {
 112                 assert(s);
 113
 114                 const QRect label_rect(0, offset,
 115                         LabelMarginWidth, SignalHeight);
 116                 s->paint_label(painter, label_rect);
 117
 118                 offset += SignalHeight;
 119         }
 120
 121         // Paint the ruler
 122         paintRuler(painter);
 123
 124         painter.end();
 125 }
 126
 127 void SigView::dataUpdated()
 128 {
 129         update();
 130 }
 131
 132 void SigView::mouseMoveEvent(QMouseEvent *event)
 133 {
 134         assert(event);
 135 }
 136
 137 void SigView::mousePressEvent(QMouseEvent *event)
 138 {
 139         assert(event);
 140 }
 141
 142 void SigView::mouseReleaseEvent(QMouseEvent *event)
 143 {
 144         assert(event);
 145
 146         const double cursor_offset = _offset + _scale * (double)event->x();
 147
 148         switch(event->button())
 149         {
 150         case Qt::LeftButton:
 151                 _scale *= 2.0 / 3.0;
 152                 break;
 153
 154         case Qt::RightButton:
 155                 _scale *= 3.0 / 2.0;
 156                 break;
 157         }
 158
 159         _offset = cursor_offset - _scale * (double)event->x();
 160
 161         update();
 162 }
 163
 164 void SigView::setupViewport(int width, int height)
 165 {
 166         glViewport(0, 0, (GLint)width, (GLint)height);
 167         glMatrixMode(GL_PROJECTION);
 168         glLoadIdentity();
 169         glOrtho(0, width, height, 0, -1, 1);
 170         glMatrixMode(GL_MODELVIEW);
 171 }
 172
 173 void SigView::paintRuler(QPainter &p)
 174 {
 175         const double MinSpacing = 80;
 176
 177         const double min_period = _scale * MinSpacing;
 178
 179         const int order = (int)floorf(log10f(min_period));
 180         const double order_decimal = pow(10, order);
 181
 182         int unit = 0;
 183         double tick_period = 0.0f;
 184
 185         do
 186         {
 187                 tick_period = order_decimal * ScaleUnits[unit++];
 188         } while(tick_period < min_period && unit < countof(ScaleUnits));
 189
 190         const int prefix = (order - FirstSIPrefixPower) / 3;
 191         assert(prefix >= 0);
 192         assert(prefix < countof(SIPrefixes));
 193
 194         const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX,
 195                 Qt::AlignLeft | Qt::AlignTop, "8").height();
 196
 197         // Draw the tick marks
 198         p.setPen(Qt::black);
 199
 200         double t = ceil(_offset / tick_period) * tick_period;
 201         double x = 0.0;
 202         while((x = (t - _offset) / _scale + LabelMarginWidth) < width())
 203         {
 204                 QString s;
 205                 QTextStream ts(&s);
 206                 ts << (t / order_decimal) << SIPrefixes[prefix] << "s";
 207                 p.drawText(x, 0, 0, text_height, Qt::AlignCenter | Qt::AlignTop |
 208                         Qt::TextDontClip, s);
 209                 p.drawLine(x, text_height, x, RulerHeight);
 210                 t += tick_period;
 211         }
 212 }