pv/view/ruler.cpp

   1 /*
   2  * This file is part of the PulseView 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 "ruler.h"
  22
  23 #include "cursor.h"
  24 #include "view.h"
  25 #include "viewport.h"
  26
  27 #include <extdef.h>
  28
  29 #include <assert.h>
  30 #include <math.h>
  31 #include <limits.h>
  32
  33 #include <QApplication>
  34 #include <QMouseEvent>
  35 #include <QPainter>
  36 #include <QTextStream>
  37
  38 #include <pv/widgets/popup.h>
  39
  40 using namespace Qt;
  41 using boost::shared_ptr;
  42
  43 namespace pv {
  44 namespace view {
  45
  46 const int Ruler::RulerHeight = 30;
  47 const int Ruler::MinorTickSubdivision = 4;
  48 const int Ruler::ScaleUnits[3] = {1, 2, 5};
  49
  50 const QString Ruler::SIPrefixes[9] =
  51         {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"};
  52 const int Ruler::FirstSIPrefixPower = -15;
  53
  54 const int Ruler::HoverArrowSize = 5;
  55
  56 Ruler::Ruler(View &parent) :
  57         MarginWidget(parent),
  58         _dragging(false)
  59 {
  60         setMouseTracking(true);
  61
  62         connect(&_view, SIGNAL(hover_point_changed()),
  63                 this, SLOT(hover_point_changed()));
  64 }
  65
  66 void Ruler::clear_selection()
  67 {
  68         CursorPair &cursors = _view.cursors();
  69         cursors.first()->select(false);
  70         cursors.second()->select(false);
  71         update();
  72 }
  73
  74 QString Ruler::format_time(double t, unsigned int prefix,
  75         unsigned int precision)
  76 {
  77         const double multiplier = pow(10.0,
  78                 (int)- prefix * 3 - FirstSIPrefixPower);
  79
  80         QString s;
  81         QTextStream ts(&s);
  82         ts.setRealNumberPrecision(precision);
  83         ts << fixed << forcesign << (t  * multiplier) <<
  84                 SIPrefixes[prefix] << "s";
  85         return s;
  86 }
  87
  88 QSize Ruler::sizeHint() const
  89 {
  90         return QSize(0, RulerHeight);
  91 }
  92
  93 void Ruler::paintEvent(QPaintEvent*)
  94 {
  95
  96         const double SpacingIncrement = 32.0f;
  97         const double MinValueSpacing = 32.0f;
  98         const int ValueMargin = 3;
  99
 100         QPainter p(this);
 101         p.setRenderHint(QPainter::Antialiasing);
 102
 103         double min_width = SpacingIncrement, typical_width;
 104         double tick_period;
 105         unsigned int prefix;
 106
 107         // Find tick spacing, and number formatting that does not cause
 108         // value to collide.
 109         do
 110         {
 111                 const double min_period = _view.scale() * min_width;
 112
 113                 const int order = (int)floorf(log10f(min_period));
 114                 const double order_decimal = pow(10.0, order);
 115
 116                 unsigned int unit = 0;
 117
 118                 do
 119                 {
 120                         tick_period = order_decimal * ScaleUnits[unit++];
 121                 } while (tick_period < min_period && unit < countof(ScaleUnits));
 122
 123                 prefix = (order - FirstSIPrefixPower) / 3;
 124                 assert(prefix < countof(SIPrefixes));
 125
 126
 127                 typical_width = p.boundingRect(0, 0, INT_MAX, INT_MAX,
 128                         AlignLeft | AlignTop, format_time(_view.offset(),
 129                         prefix)).width() + MinValueSpacing;
 130
 131                 min_width += SpacingIncrement;
 132
 133         } while(typical_width > tick_period / _view.scale());
 134
 135         const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX,
 136                 AlignLeft | AlignTop, "8").height();
 137
 138         // Draw the tick marks
 139         p.setPen(palette().color(foregroundRole()));
 140
 141         const double minor_tick_period = tick_period / MinorTickSubdivision;
 142         const double first_major_division =
 143                 floor(_view.offset() / tick_period);
 144         const double first_minor_division =
 145                 ceil(_view.offset() / minor_tick_period);
 146         const double t0 = first_major_division * tick_period;
 147
 148         int division = (int)round(first_minor_division -
 149                 first_major_division * MinorTickSubdivision) - 1;
 150
 151         const int major_tick_y1 = text_height + ValueMargin * 2;
 152         const int tick_y2 = height();
 153         const int minor_tick_y1 = (major_tick_y1 + tick_y2) / 2;
 154
 155         double x;
 156
 157         do {
 158                 const double t = t0 + division * minor_tick_period;
 159                 x = (t - _view.offset()) / _view.scale();
 160
 161                 if (division % MinorTickSubdivision == 0)
 162                 {
 163                         // Draw a major tick
 164                         p.drawText(x, ValueMargin, 0, text_height,
 165                                 AlignCenter | AlignTop | TextDontClip,
 166                                 format_time(t, prefix));
 167                         p.drawLine(QPointF(x, major_tick_y1),
 168                                 QPointF(x, tick_y2));
 169                 }
 170                 else
 171                 {
 172                         // Draw a minor tick
 173                         p.drawLine(QPointF(x, minor_tick_y1),
 174                                 QPointF(x, tick_y2));
 175                 }
 176
 177                 division++;
 178
 179         } while (x < width());
 180
 181         // Draw the cursors
 182         if (_view.cursors_shown())
 183                 _view.cursors().draw_markers(p, rect(), prefix);
 184
 185         // Draw the hover mark
 186         draw_hover_mark(p);
 187
 188         p.end();
 189 }
 190
 191 void Ruler::mouseMoveEvent(QMouseEvent *e)
 192 {
 193         if (!(e->buttons() & Qt::LeftButton))
 194                 return;
 195
 196         if ((e->pos() - _mouse_down_point).manhattanLength() <
 197                 QApplication::startDragDistance())
 198                 return;
 199
 200         _dragging = true;
 201
 202         if (shared_ptr<TimeMarker> m = _grabbed_marker.lock())
 203                 m->set_time(_view.offset() +
 204                         ((double)e->x() + 0.5) * _view.scale());
 205 }
 206
 207 void Ruler::mousePressEvent(QMouseEvent *e)
 208 {
 209         if (e->buttons() & Qt::LeftButton)
 210         {
 211                 _mouse_down_point = e->pos();
 212
 213                 _grabbed_marker.reset();
 214
 215                 clear_selection();
 216
 217                 if (_view.cursors_shown()) {
 218                         CursorPair &cursors = _view.cursors();
 219                         if (cursors.first()->get_label_rect(
 220                                 rect()).contains(e->pos()))
 221                                 _grabbed_marker = cursors.first();
 222                         else if (cursors.second()->get_label_rect(
 223                                 rect()).contains(e->pos()))
 224                                 _grabbed_marker = cursors.second();
 225                 }
 226
 227                 if (shared_ptr<TimeMarker> m = _grabbed_marker.lock())
 228                         m->select();
 229
 230                 selection_changed();
 231         }
 232 }
 233
 234 void Ruler::mouseReleaseEvent(QMouseEvent *)
 235 {
 236         using pv::widgets::Popup;
 237
 238         if (!_dragging)
 239                 if (shared_ptr<TimeMarker> m = _grabbed_marker.lock()) {
 240                         Popup *const p = m->create_popup(&_view);
 241                         p->set_position(mapToGlobal(QPoint(m->get_x(),
 242                                 height())), Popup::Bottom);
 243                         p->show();
 244                 }
 245
 246         _dragging = false;
 247         _grabbed_marker.reset();
 248 }
 249
 250 void Ruler::draw_hover_mark(QPainter &p)
 251 {
 252         const int x = _view.hover_point().x();
 253
 254         if (x == -1 || _dragging)
 255                 return;
 256
 257         p.setPen(QPen(Qt::NoPen));
 258         p.setBrush(QBrush(palette().color(foregroundRole())));
 259
 260         const int b = height() - 1;
 261         const QPointF points[] = {
 262                 QPointF(x, b),
 263                 QPointF(x - HoverArrowSize, b - HoverArrowSize),
 264                 QPointF(x + HoverArrowSize, b - HoverArrowSize)
 265         };
 266         p.drawPolygon(points, countof(points));
 267 }
 268
 269 void Ruler::hover_point_changed()
 270 {
 271         update();
 272 }
 273
 274 } // namespace view
 275 } // namespace pv