pv/view/cursor.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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "cursor.hpp"
  21
  22 #include "ruler.hpp"
  23 #include "view.hpp"
  24 #include "pv/util.hpp"
  25
  26 #include <QApplication>
  27 #include <QBrush>
  28 #include <QPainter>
  29 #include <QPointF>
  30 #include <QRect>
  31 #include <QRectF>
  32
  33 #include <cassert>
  34 #include <cstdio>
  35 #include <limits>
  36
  37 using std::abs; // Force usage of std::abs() instead of C's abs().
  38 using std::shared_ptr;
  39
  40 namespace pv {
  41 namespace views {
  42 namespace TraceView {
  43
  44 const QColor Cursor::FillColour(52, 101, 164);
  45
  46 Cursor::Cursor(View &view, double time) :
  47         TimeMarker(view, FillColour, time)
  48 {
  49 }
  50
  51 bool Cursor::enabled() const
  52 {
  53         return view_.cursors_shown();
  54 }
  55
  56 QString Cursor::get_text() const
  57 {
  58         const shared_ptr<Cursor> other = get_other_cursor();
  59         const pv::util::Timestamp& diff = abs(time_ - other->time_);
  60
  61         return Ruler::format_time_with_distance(
  62                 diff, time_, view_.tick_prefix(), view_.time_unit(), view_.tick_precision());
  63 }
  64
  65 QRectF Cursor::label_rect(const QRectF &rect) const
  66 {
  67         const shared_ptr<Cursor> other(get_other_cursor());
  68         assert(other);
  69
  70         const float x = ((time_ - view_.offset())/ view_.scale()).convert_to<float>();
  71
  72         QFontMetrics m(QApplication::font());
  73         QSize text_size = m.boundingRect(get_text()).size();
  74
  75         const QSizeF label_size(
  76                 text_size.width() + LabelPadding.width() * 2,
  77                 text_size.height() + LabelPadding.height() * 2);
  78         const float top = rect.height() - label_size.height() -
  79                 TimeMarker::ArrowSize - 0.5f;
  80         const float height = label_size.height();
  81
  82         const pv::util::Timestamp& other_time = other->time();
  83
  84         if (time_ > other_time ||
  85                 (abs(time_ - other_time).is_zero() && this > other.get()))
  86                 return QRectF(x, top, label_size.width(), height);
  87         else
  88                 return QRectF(x - label_size.width(), top, label_size.width(), height);
  89 }
  90
  91 shared_ptr<Cursor> Cursor::get_other_cursor() const
  92 {
  93         const shared_ptr<CursorPair> cursors(view_.cursors());
  94         assert(cursors);
  95         return (cursors->first().get() == this) ?
  96                 cursors->second() : cursors->first();
  97 }
  98
  99 } // namespace TraceView
 100 } // namespace views
 101 } // namespace pv