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