signal.cpp

   1 /*
   2  * This file is part of the sigrok 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 "signal.h"
  22
  23 #include "extdef.h"
  24
  25 const QSizeF Signal::LabelPadding(4, 0);
  26
  27 Signal::Signal(QString name) :
  28         _name(name)
  29 {
  30 }
  31
  32 QString Signal::get_name() const
  33 {
  34         return _name;
  35 }
  36
  37 void Signal::paint_label(QPainter &p, const QRect &rect)
  38 {
  39         p.setBrush(get_colour());
  40
  41         const QString text(_name);
  42         const QColor colour = get_colour();
  43
  44         const QSizeF text_size = p.boundingRect(
  45                 QRectF(0, 0, rect.width(), 0), 0, text).size();
  46
  47         const float nominal_offset = get_nominal_offset(rect);
  48         const QSizeF label_size(
  49                 text_size.width() + LabelPadding.width() * 2,
  50                 text_size.height() + LabelPadding.height() * 2);
  51         const float label_arrow_length = label_size.height() / 2;
  52         const QRectF label_rect(
  53                 rect.right() - label_arrow_length - label_size.width(),
  54                 nominal_offset - label_size.height() / 2,
  55                 label_size.width(), label_size.height());
  56
  57         // Paint the label
  58         const QPointF points[] = {
  59                 label_rect.topLeft(),
  60                 label_rect.topRight(),
  61                 QPointF(rect.right(), nominal_offset),
  62                 label_rect.bottomRight(),
  63                 label_rect.bottomLeft()
  64         };
  65
  66         const QPointF highlight_points[] = {
  67                 QPointF(label_rect.left() + 1, label_rect.top() + 1),
  68                 QPointF(label_rect.right(), label_rect.top() + 1),
  69                 QPointF(rect.right() - 1, nominal_offset),
  70                 QPointF(label_rect.right(), label_rect.bottom() - 1),
  71                 QPointF(label_rect.left() + 1, label_rect.bottom() - 1)
  72         };
  73
  74         p.setPen(Qt::transparent);
  75         p.setBrush(colour);
  76         p.drawPolygon(points, countof(points));
  77
  78         p.setPen(colour.lighter());
  79         p.setBrush(Qt::transparent);
  80         p.drawPolygon(highlight_points, countof(highlight_points));
  81
  82         p.setPen(colour.darker());
  83         p.setBrush(Qt::transparent);
  84         p.drawPolygon(points, countof(points));
  85
  86         // Paint the text
  87         p.setPen((colour.lightness() > 64) ? Qt::black : Qt::white);
  88         p.drawText(label_rect, Qt::AlignCenter | Qt::AlignVCenter, text);
  89 }