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         const unsigned int prefix = view_.tick_prefix();
  95
  96         // Draw the tick marks
  97         p.setPen(palette().color(foregroundRole()));
  98
  99         const double minor_tick_period = tick_period / MinorTickSubdivision;
 100         const double first_major_division =
 101                 floor(view_.offset() / tick_period);
 102         const double first_minor_division =
 103                 ceil(view_.offset() / minor_tick_period);
 104         const double t0 = first_major_division * tick_period;
 105
 106         int division = (int)round(first_minor_division -
 107                 first_major_division * MinorTickSubdivision) - 1;
 108
 109         const int text_height = calculate_text_height();
 110         const int ruler_height = RulerHeight * text_height;
 111         const int major_tick_y1 = text_height + ValueMargin * 2;
 112         const int minor_tick_y1 = (major_tick_y1 + ruler_height) / 2;
 113
 114         double x;
 115
 116         do {
 117                 const double t = t0 + division * minor_tick_period;
 118                 x = (t - view_.offset()) / view_.scale();
 119
 120                 if (division % MinorTickSubdivision == 0)
 121                 {
 122                         // Draw a major tick
 123                         p.drawText(x, ValueMargin, 0, text_height,
 124                                 AlignCenter | AlignTop | TextDontClip,
 125                                 pv::util::format_time(t, prefix));
 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
 138         } while (x < width());
 139
 140         // Draw the hover mark
 141         draw_hover_mark(p, text_height);
 142
 143         // The cursor labels are not drawn with the arrows exactly on the
 144         // bottom line of the widget, because then the selection shadow
 145         // would be clipped away.
 146         const QRect r = rect().adjusted(0, 0, 0, -ViewItem::HighlightRadius);
 147
 148         // Draw the items
 149         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 150         for (auto &i : items) {
 151                 const bool highlight = !item_dragging_ &&
 152                         i->label_rect(r).contains(mouse_point_);
 153                 i->paint_label(p, r, highlight);
 154         }
 155 }
 156
 157 void Ruler::mouseDoubleClickEvent(QMouseEvent *e)
 158 {
 159         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
 160 }
 161
 162 void Ruler::draw_hover_mark(QPainter &p, int text_height)
 163 {
 164         const int x = view_.hover_point().x();
 165
 166         if (x == -1)
 167                 return;
 168
 169         p.setPen(QPen(Qt::NoPen));
 170         p.setBrush(QBrush(palette().color(foregroundRole())));
 171
 172         const int b = RulerHeight * text_height;
 173         const float hover_arrow_size = HoverArrowSize * text_height;
 174         const QPointF points[] = {
 175                 QPointF(x, b),
 176                 QPointF(x - hover_arrow_size, b - hover_arrow_size),
 177                 QPointF(x + hover_arrow_size, b - hover_arrow_size)
 178         };
 179         p.drawPolygon(points, countof(points));
 180 }
 181
 182 int Ruler::calculate_text_height() const
 183 {
 184         return QFontMetrics(font()).ascent();
 185 }
 186
 187 void Ruler::hover_point_changed()
 188 {
 189         update();
 190 }
 191
 192 } // namespace view
 193 } // namespace pv