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 <extdef.h>
  22
  23 #include <QApplication>
  24 #include <QFontMetrics>
  25 #include <QMouseEvent>
  26
  27 #include "ruler.hpp"
  28 #include "view.hpp"
  29
  30 #include <pv/util.hpp>
  31
  32 using namespace Qt;
  33
  34 using std::shared_ptr;
  35 using std::vector;
  36
  37 namespace pv {
  38 namespace view {
  39
  40 const float Ruler::RulerHeight = 2.5f;  // x Text Height
  41 const int Ruler::MinorTickSubdivision = 4;
  42
  43 const float Ruler::HoverArrowSize = 0.5f;  // x Text Height
  44
  45 Ruler::Ruler(View &parent) :
  46         MarginWidget(parent)
  47 {
  48         setMouseTracking(true);
  49
  50         connect(&view_, SIGNAL(hover_point_changed()),
  51                 this, SLOT(hover_point_changed()));
  52 }
  53
  54 QSize Ruler::sizeHint() const
  55 {
  56         const int text_height = calculate_text_height();
  57         return QSize(0, RulerHeight * text_height);
  58 }
  59
  60 QSize Ruler::extended_size_hint() const
  61 {
  62         QRectF max_rect;
  63         std::vector< std::shared_ptr<TimeItem> > items(view_.time_items());
  64         for (auto &i : items)
  65                 max_rect = max_rect.united(i->label_rect(QRect()));
  66         return QSize(0, sizeHint().height() - max_rect.top() / 2 +
  67                 ViewItem::HighlightRadius);
  68 }
  69
  70 vector< shared_ptr<ViewItem> > Ruler::items()
  71 {
  72         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
  73         return vector< shared_ptr<ViewItem> >(
  74                 time_items.begin(), time_items.end());
  75 }
  76
  77 shared_ptr<ViewItem> Ruler::get_mouse_over_item(const QPoint &pt)
  78 {
  79         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  80         for (auto i = items.rbegin(); i != items.rend(); i++)
  81                 if ((*i)->enabled() && (*i)->label_rect(rect()).contains(pt))
  82                         return *i;
  83         return nullptr;
  84 }
  85
  86 void Ruler::paintEvent(QPaintEvent*)
  87 {
  88         const int ValueMargin = 3;
  89
  90         QPainter p(this);
  91         p.setRenderHint(QPainter::Antialiasing);
  92
  93         const double tick_period = view_.tick_period();
  94
  95         // Draw the tick marks
  96         p.setPen(palette().color(foregroundRole()));
  97
  98         const double minor_tick_period = tick_period / MinorTickSubdivision;
  99         const pv::util::Timestamp first_major_division =
 100                 floor(view_.offset() / tick_period);
 101         const pv::util::Timestamp first_minor_division =
 102                 ceil(view_.offset() / minor_tick_period);
 103         const pv::util::Timestamp t0 = first_major_division * tick_period;
 104
 105         int division = (round(first_minor_division -
 106                 first_major_division * MinorTickSubdivision)).convert_to<int>() - 1;
 107
 108         const int text_height = calculate_text_height();
 109         const int ruler_height = RulerHeight * text_height;
 110         const int major_tick_y1 = text_height + ValueMargin * 2;
 111         const int minor_tick_y1 = (major_tick_y1 + ruler_height) / 2;
 112
 113         double x;
 114
 115         do {
 116                 const pv::util::Timestamp t = t0 + division * minor_tick_period;
 117                 x = ((t - view_.offset()) / view_.scale()).convert_to<double>();
 118
 119                 if (division % MinorTickSubdivision == 0)
 120                 {
 121                         // Draw a major tick
 122                         p.drawText(x, ValueMargin, 0, text_height,
 123                                 AlignCenter | AlignTop | TextDontClip,
 124                                 util::format_time(t, view_.tick_prefix(), view_.time_unit(),
 125                                         view_.tick_precision()));
 126                         p.drawLine(QPointF(x, major_tick_y1),
 127                                 QPointF(x, ruler_height));
 128                 }
 129                 else
 130                 {
 131                         // Draw a minor tick
 132                         p.drawLine(QPointF(x, minor_tick_y1),
 133                                 QPointF(x, ruler_height));
 134                 }
 135
 136                 division++;
 137         } while (x < width());
 138
 139         // Draw the hover mark
 140         draw_hover_mark(p, text_height);
 141
 142         // The cursor labels are not drawn with the arrows exactly on the
 143         // bottom line of the widget, because then the selection shadow
 144         // would be clipped away.
 145         const QRect r = rect().adjusted(0, 0, 0, -ViewItem::HighlightRadius);
 146
 147         // Draw the items
 148         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 149         for (auto &i : items) {
 150                 const bool highlight = !item_dragging_ &&
 151                         i->label_rect(r).contains(mouse_point_);
 152                 i->paint_label(p, r, highlight);
 153         }
 154 }
 155
 156 void Ruler::mouseDoubleClickEvent(QMouseEvent *e)
 157 {
 158         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
 159 }
 160
 161 void Ruler::draw_hover_mark(QPainter &p, int text_height)
 162 {
 163         const int x = view_.hover_point().x();
 164
 165         if (x == -1)
 166                 return;
 167
 168         p.setPen(QPen(Qt::NoPen));
 169         p.setBrush(QBrush(palette().color(foregroundRole())));
 170
 171         const int b = RulerHeight * text_height;
 172         const float hover_arrow_size = HoverArrowSize * text_height;
 173         const QPointF points[] = {
 174                 QPointF(x, b),
 175                 QPointF(x - hover_arrow_size, b - hover_arrow_size),
 176                 QPointF(x + hover_arrow_size, b - hover_arrow_size)
 177         };
 178         p.drawPolygon(points, countof(points));
 179 }
 180
 181 int Ruler::calculate_text_height() const
 182 {
 183         return QFontMetrics(font()).ascent();
 184 }
 185
 186 void Ruler::hover_point_changed()
 187 {
 188         update();
 189 }
 190
 191 } // namespace view
 192 } // namespace pv