sigviewport.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 "sigviewport.h"
  22
  23 #include "sigsession.h"
  24 #include "signal.h"
  25 #include "sigview.h"
  26
  27 #include "extdef.h"
  28
  29 #include <QMouseEvent>
  30 #include <QTextStream>
  31
  32 #include <math.h>
  33
  34 #include <boost/foreach.hpp>
  35
  36 using namespace boost;
  37 using namespace std;
  38
  39 const int SigViewport::SignalHeight = 50;
  40
  41 const int SigViewport::MinorTickSubdivision = 4;
  42 const int SigViewport::ScaleUnits[3] = {1, 2, 5};
  43
  44 const QString SigViewport::SIPrefixes[9] =
  45         {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"};
  46 const int SigViewport::FirstSIPrefixPower = -15;
  47
  48 SigViewport::SigViewport(SigView &parent) :
  49         QGLWidget(&parent),
  50         _view(parent)
  51 {
  52         setMouseTracking(true);
  53         setAutoFillBackground(false);
  54 }
  55
  56 int SigViewport::get_total_height() const
  57 {
  58         int height = 0;
  59         BOOST_FOREACH(const shared_ptr<Signal> s,
  60                 _view._session.get_signals()) {
  61                 assert(s);
  62                 height += SignalHeight;
  63         }
  64
  65         return height;
  66 }
  67
  68 void SigViewport::initializeGL()
  69 {
  70 }
  71
  72 void SigViewport::resizeGL(int width, int height)
  73 {
  74         setup_viewport(width, height);
  75 }
  76
  77 void SigViewport::paintEvent(QPaintEvent *event)
  78 {
  79         int offset;
  80
  81         const vector< shared_ptr<Signal> > &sigs =
  82                 _view._session.get_signals();
  83
  84         // Prepare for OpenGL rendering
  85         makeCurrent();
  86         glMatrixMode(GL_MODELVIEW);
  87         glPushMatrix();
  88
  89         setup_viewport(width(), height());
  90
  91         qglClearColor(Qt::white);
  92         glClear(GL_COLOR_BUFFER_BIT);
  93
  94         // Plot the signal
  95         glEnable(GL_SCISSOR_TEST);
  96         glScissor(SigView::LabelMarginWidth, 0, width(), height());
  97         offset = SigView::RulerHeight - _view.v_offset();
  98         BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
  99         {
 100                 assert(s);
 101
 102                 const QRect signal_rect(SigView::LabelMarginWidth, offset,
 103                         width() - SigView::LabelMarginWidth, SignalHeight);
 104
 105                 s->paint(*this, signal_rect, _view.scale(), _view.offset());
 106
 107                 offset += SignalHeight;
 108         }
 109
 110         glDisable(GL_SCISSOR_TEST);
 111
 112         // Prepare for QPainter rendering
 113         glMatrixMode(GL_MODELVIEW);
 114         glPopMatrix();
 115
 116         QPainter painter(this);
 117         painter.setRenderHint(QPainter::Antialiasing);
 118
 119         // Paint the labels
 120         offset = SigView::RulerHeight - _view.v_offset();
 121         BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
 122         {
 123                 assert(s);
 124
 125                 const QRect label_rect(0, offset,
 126                         SigView::LabelMarginWidth, SignalHeight);
 127                 s->paint_label(painter, label_rect);
 128
 129                 offset += SignalHeight;
 130         }
 131
 132         // Paint the ruler
 133         paint_ruler(painter);
 134
 135         painter.end();
 136 }
 137
 138 void SigViewport::mousePressEvent(QMouseEvent *event)
 139 {
 140         assert(event);
 141
 142         _mouse_down_point = event->pos();
 143         _mouse_down_offset = _view.offset();
 144 }
 145
 146 void SigViewport::mouseMoveEvent(QMouseEvent *event)
 147 {
 148         assert(event);
 149
 150         if(event->buttons() & Qt::LeftButton)
 151         {
 152                 _view.set_scale_offset(_view.scale(),
 153                         _mouse_down_offset +
 154                         (_mouse_down_point - event->pos()).x() *
 155                         _view.scale());
 156         }
 157 }
 158
 159 void SigViewport::mouseReleaseEvent(QMouseEvent *event)
 160 {
 161         assert(event);
 162 }
 163
 164 void SigViewport::wheelEvent(QWheelEvent *event)
 165 {
 166         assert(event);
 167         _view.zoom(event->delta() / 120, event->x() -
 168                 SigView::LabelMarginWidth);
 169 }
 170
 171 void SigViewport::setup_viewport(int width, int height)
 172 {
 173         glViewport(0, 0, (GLint)width, (GLint)height);
 174         glMatrixMode(GL_PROJECTION);
 175         glLoadIdentity();
 176         glOrtho(0, width, height, 0, -1, 1);
 177         glMatrixMode(GL_MODELVIEW);
 178 }
 179
 180 void SigViewport::paint_ruler(QPainter &p)
 181 {
 182         const double MinSpacing = 80;
 183
 184         const double min_period = _view.scale() * MinSpacing;
 185
 186         const int order = (int)floorf(log10f(min_period));
 187         const double order_decimal = pow(10, order);
 188
 189         int unit = 0;
 190         double tick_period = 0.0f;
 191
 192         do
 193         {
 194                 tick_period = order_decimal * ScaleUnits[unit++];
 195         } while(tick_period < min_period && unit < countof(ScaleUnits));
 196
 197         const int prefix = (order - FirstSIPrefixPower) / 3;
 198         assert(prefix >= 0);
 199         assert(prefix < countof(SIPrefixes));
 200
 201         const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX,
 202                 Qt::AlignLeft | Qt::AlignTop, "8").height();
 203
 204         // Draw the tick marks
 205         p.setPen(Qt::black);
 206
 207         const double minor_tick_period = tick_period / MinorTickSubdivision;
 208         const double first_major_division =
 209                 floor(_view.offset() / tick_period);
 210         const double first_minor_division =
 211                 ceil(_view.offset() / minor_tick_period);
 212         const double t0 = first_major_division * tick_period;
 213
 214         int division = (int)round(first_minor_division -
 215                 first_major_division * MinorTickSubdivision);
 216         while(1)
 217         {
 218                 const double t = t0 + division * minor_tick_period;
 219                 const double x = (t - _view.offset()) / _view.scale() +
 220                         SigView::LabelMarginWidth;
 221
 222                 if(x >= width())
 223                         break;
 224
 225                 if(division % MinorTickSubdivision == 0)
 226                 {
 227                         // Draw a major tick
 228                         QString s;
 229                         QTextStream ts(&s);
 230                         ts << (t / order_decimal) << SIPrefixes[prefix] << "s";
 231                         p.drawText(x, 0, 0, text_height, Qt::AlignCenter | Qt::AlignTop |
 232                                 Qt::TextDontClip, s);
 233                         p.drawLine(x, text_height, x, SigView::RulerHeight);
 234                 }
 235                 else
 236                 {
 237                         // Draw a minor tick
 238                         p.drawLine(x,
 239                                 (text_height + SigView::RulerHeight) / 2, x,
 240                                 SigView::RulerHeight);
 241                 }
 242
 243                 division++;
 244         }
 245 }