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 <QMouseEvent>
  27
  28 #include <boost/foreach.hpp>
  29
  30 using namespace boost;
  31 using namespace std;
  32
  33 const int SigView::SignalHeight = 50;
  34 const int SigView::LabelMarginWidth = 70;
  35
  36 SigView::SigView(SigSession &session, QWidget *parent) :
  37         QGLWidget(parent),
  38         _session(session),
  39         _scale(1e-6),
  40         _offset(0)
  41 {
  42         connect(&_session, SIGNAL(dataUpdated()),
  43                 this, SLOT(dataUpdated()));
  44
  45         setMouseTracking(true);
  46         setAutoFillBackground(false);
  47 }
  48
  49 void SigView::initializeGL()
  50 {
  51 }
  52
  53 void SigView::resizeGL(int width, int height)
  54 {
  55         setupViewport(width, height);
  56 }
  57
  58 void SigView::paintEvent(QPaintEvent *event)
  59 {
  60         int offset;
  61
  62         const vector< shared_ptr<Signal> > &sigs =
  63                 _session.get_signals();
  64
  65         // Prepare for OpenGL rendering
  66         makeCurrent();
  67         glMatrixMode(GL_MODELVIEW);
  68         glPushMatrix();
  69
  70         setupViewport(width(), height());
  71
  72         qglClearColor(Qt::white);
  73         glClear(GL_COLOR_BUFFER_BIT);
  74
  75         // Plot the signal
  76         offset = 0;
  77         BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
  78         {
  79                 assert(s);
  80
  81                 const QRect signal_rect(LabelMarginWidth, offset,
  82                         width() - LabelMarginWidth, SignalHeight);
  83
  84                 s->paint(*this, signal_rect, _scale, _offset);
  85
  86                 offset += SignalHeight;
  87         }
  88
  89         // Prepare for QPainter rendering
  90         glMatrixMode(GL_MODELVIEW);
  91         glPopMatrix();
  92
  93         QPainter painter(this);
  94         painter.setRenderHint(QPainter::Antialiasing);
  95
  96         // Paint the label
  97         offset = 0;
  98         BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
  99         {
 100                 assert(s);
 101
 102                 const QRect label_rect(0, offset,
 103                         LabelMarginWidth, SignalHeight);
 104                 s->paint_label(painter, label_rect);
 105
 106                 offset += SignalHeight;
 107         }
 108
 109         painter.end();
 110 }
 111
 112 void SigView::dataUpdated()
 113 {
 114         update();
 115 }
 116
 117 void SigView::mouseMoveEvent(QMouseEvent *event)
 118 {
 119         assert(event);
 120 }
 121
 122 void SigView::mousePressEvent(QMouseEvent *event)
 123 {
 124         assert(event);
 125 }
 126
 127 void SigView::mouseReleaseEvent(QMouseEvent *event)
 128 {
 129         assert(event);
 130
 131         const double cursor_offset = _offset + _scale * (double)event->x();
 132
 133         switch(event->button())
 134         {
 135         case Qt::LeftButton:
 136                 _scale *= 2.0 / 3.0;
 137                 break;
 138
 139         case Qt::RightButton:
 140                 _scale *= 3.0 / 2.0;
 141                 break;
 142         }
 143
 144         _offset = cursor_offset - _scale * (double)event->x();
 145
 146         update();
 147 }
 148
 149 void SigView::setupViewport(int width, int height)
 150 {
 151         glViewport(0, 0, (GLint)width, (GLint)height);
 152         glMatrixMode(GL_PROJECTION);
 153         glLoadIdentity();
 154         glOrtho(0, width, height, 0, -1, 1);
 155         glMatrixMode(GL_MODELVIEW);
 156 }