pv/view/viewport.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 "view.h"
  22 #include "viewport.h"
  23
  24 #include "../../sigsession.h"
  25 #include "../../signal.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 namespace pv {
  40 namespace view {
  41
  42 const int Viewport::SignalHeight = 50;
  43
  44 const int Viewport::MinorTickSubdivision = 4;
  45 const int Viewport::ScaleUnits[3] = {1, 2, 5};
  46
  47 const QString Viewport::SIPrefixes[9] =
  48         {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"};
  49 const int Viewport::FirstSIPrefixPower = -15;
  50
  51 Viewport::Viewport(View &parent) :
  52         QGLWidget(&parent),
  53         _view(parent)
  54 {
  55         setMouseTracking(true);
  56         setAutoFillBackground(false);
  57 }
  58
  59 int Viewport::get_total_height() const
  60 {
  61         int height = 0;
  62         BOOST_FOREACH(const shared_ptr<Signal> s,
  63                 _view._session.get_signals()) {
  64                 assert(s);
  65                 height += SignalHeight;
  66         }
  67
  68         return height;
  69 }
  70
  71 void Viewport::initializeGL()
  72 {
  73 }
  74
  75 void Viewport::resizeGL(int width, int height)
  76 {
  77         setup_viewport(width, height);
  78 }
  79
  80 void Viewport::paintEvent(QPaintEvent *event)
  81 {
  82         int offset;
  83
  84         const vector< shared_ptr<Signal> > &sigs =
  85                 _view._session.get_signals();
  86
  87         // Prepare for OpenGL rendering
  88         makeCurrent();
  89         glMatrixMode(GL_MODELVIEW);
  90         glPushMatrix();
  91
  92         setup_viewport(width(), height());
  93
  94         qglClearColor(Qt::white);
  95         glClear(GL_COLOR_BUFFER_BIT);
  96
  97         // Plot the signal
  98         glEnable(GL_SCISSOR_TEST);
  99         glScissor(View::LabelMarginWidth, 0, width(), height());
 100         offset = View::RulerHeight - _view.v_offset();
 101         BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
 102         {
 103                 assert(s);
 104
 105                 const QRect signal_rect(View::LabelMarginWidth, offset,
 106                         width() - View::LabelMarginWidth, SignalHeight);
 107
 108                 s->paint(*this, signal_rect, _view.scale(), _view.offset());
 109
 110                 offset += SignalHeight;
 111         }
 112
 113         glDisable(GL_SCISSOR_TEST);
 114
 115         // Prepare for QPainter rendering
 116         glMatrixMode(GL_MODELVIEW);
 117         glPopMatrix();
 118
 119         QPainter painter(this);
 120         painter.setRenderHint(QPainter::Antialiasing);
 121
 122         // Paint the labels
 123         offset = View::RulerHeight - _view.v_offset();
 124         BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
 125         {
 126                 assert(s);
 127
 128                 const QRect label_rect(0, offset,
 129                         View::LabelMarginWidth, SignalHeight);
 130                 s->paint_label(painter, label_rect);
 131
 132                 offset += SignalHeight;
 133         }
 134
 135         // Paint the ruler
 136         paint_ruler(painter);
 137
 138         painter.end();
 139 }
 140
 141 void Viewport::mousePressEvent(QMouseEvent *event)
 142 {
 143         assert(event);
 144
 145         _mouse_down_point = event->pos();
 146         _mouse_down_offset = _view.offset();
 147 }
 148
 149 void Viewport::mouseMoveEvent(QMouseEvent *event)
 150 {
 151         assert(event);
 152
 153         if(event->buttons() & Qt::LeftButton)
 154         {
 155                 _view.set_scale_offset(_view.scale(),
 156                         _mouse_down_offset +
 157                         (_mouse_down_point - event->pos()).x() *
 158                         _view.scale());
 159         }
 160 }
 161
 162 void Viewport::mouseReleaseEvent(QMouseEvent *event)
 163 {
 164         assert(event);
 165 }
 166
 167 void Viewport::wheelEvent(QWheelEvent *event)
 168 {
 169         assert(event);
 170         _view.zoom(event->delta() / 120, event->x() -
 171                 View::LabelMarginWidth);
 172 }
 173
 174 void Viewport::setup_viewport(int width, int height)
 175 {
 176         glViewport(0, 0, (GLint)width, (GLint)height);
 177         glMatrixMode(GL_PROJECTION);
 178         glLoadIdentity();
 179         glOrtho(0, width, height, 0, -1, 1);
 180         glMatrixMode(GL_MODELVIEW);
 181 }
 182
 183 void Viewport::paint_ruler(QPainter &p)
 184 {
 185         const double MinSpacing = 80;
 186
 187         const double min_period = _view.scale() * MinSpacing;
 188
 189         const int order = (int)floorf(log10f(min_period));
 190         const double order_decimal = pow(10, order);
 191
 192         int unit = 0;
 193         double tick_period = 0.0f;
 194
 195         do
 196         {
 197                 tick_period = order_decimal * ScaleUnits[unit++];
 198         } while(tick_period < min_period && unit < countof(ScaleUnits));
 199
 200         const int prefix = (order - FirstSIPrefixPower) / 3;
 201         assert(prefix >= 0);
 202         assert(prefix < countof(SIPrefixes));
 203
 204         const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX,
 205                 Qt::AlignLeft | Qt::AlignTop, "8").height();
 206
 207         // Draw the tick marks
 208         p.setPen(Qt::black);
 209
 210         const double minor_tick_period = tick_period / MinorTickSubdivision;
 211         const double first_major_division =
 212                 floor(_view.offset() / tick_period);
 213         const double first_minor_division =
 214                 ceil(_view.offset() / minor_tick_period);
 215         const double t0 = first_major_division * tick_period;
 216
 217         int division = (int)round(first_minor_division -
 218                 first_major_division * MinorTickSubdivision);
 219         while(1)
 220         {
 221                 const double t = t0 + division * minor_tick_period;
 222                 const double x = (t - _view.offset()) / _view.scale() +
 223                         View::LabelMarginWidth;
 224
 225                 if(x >= width())
 226                         break;
 227
 228                 if(division % MinorTickSubdivision == 0)
 229                 {
 230                         // Draw a major tick
 231                         QString s;
 232                         QTextStream ts(&s);
 233                         ts << (t / order_decimal) << SIPrefixes[prefix] << "s";
 234                         p.drawText(x, 0, 0, text_height, Qt::AlignCenter | Qt::AlignTop |
 235                                 Qt::TextDontClip, s);
 236                         p.drawLine(x, text_height, x, View::RulerHeight);
 237                 }
 238                 else
 239                 {
 240                         // Draw a minor tick
 241                         p.drawLine(x,
 242                                 (text_height + View::RulerHeight) / 2, x,
 243                                 View::RulerHeight);
 244                 }
 245
 246                 division++;
 247         }
 248 }
 249
 250 } // namespace view
 251 } // namespace pv