pv/signal.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 "signal.h"
  24
  25 namespace pv {
  26
  27 const QSizeF Signal::LabelPadding(4, 0);
  28
  29 Signal::Signal(QString name) :
  30         _name(name)
  31 {
  32 }
  33
  34 QString Signal::get_name() const
  35 {
  36         return _name;
  37 }
  38
  39 QRectF Signal::get_label_rect(QPainter &p, const QRect &rect)
  40 {
  41         const QSizeF text_size = p.boundingRect(
  42                 QRectF(0, 0, rect.width(), 0), 0, _name).size();
  43
  44         const float nominal_offset = get_nominal_offset(rect);
  45         const QSizeF label_size(
  46                 text_size.width() + LabelPadding.width() * 2,
  47                 text_size.height() + LabelPadding.height() * 2);
  48         const float label_arrow_length = label_size.height() / 2;
  49         return QRectF(
  50                 rect.right() - label_arrow_length - label_size.width(),
  51                 nominal_offset - label_size.height() / 2,
  52                 label_size.width(), label_size.height());
  53 }
  54
  55 void Signal::paint_label(QPainter &p, const QRect &rect)
  56 {
  57         p.setBrush(get_colour());
  58
  59         const QColor colour = get_colour();
  60         const float nominal_offset = get_nominal_offset(rect);
  61         const QRectF label_rect = get_label_rect(p, rect);
  62
  63         // Paint the label
  64         const QPointF points[] = {
  65                 label_rect.topLeft(),
  66                 label_rect.topRight(),
  67                 QPointF(rect.right(), nominal_offset),
  68                 label_rect.bottomRight(),
  69                 label_rect.bottomLeft()
  70         };
  71
  72         const QPointF highlight_points[] = {
  73                 QPointF(label_rect.left() + 1, label_rect.top() + 1),
  74                 QPointF(label_rect.right(), label_rect.top() + 1),
  75                 QPointF(rect.right() - 1, nominal_offset),
  76                 QPointF(label_rect.right(), label_rect.bottom() - 1),
  77                 QPointF(label_rect.left() + 1, label_rect.bottom() - 1)
  78         };
  79
  80         p.setPen(Qt::transparent);
  81         p.setBrush(colour);
  82         p.drawPolygon(points, countof(points));
  83
  84         p.setPen(colour.lighter());
  85         p.setBrush(Qt::transparent);
  86         p.drawPolygon(highlight_points, countof(highlight_points));
  87
  88         p.setPen(colour.darker());
  89         p.setBrush(Qt::transparent);
  90         p.drawPolygon(points, countof(points));
  91
  92         // Paint the text
  93         p.setPen((colour.lightness() > 64) ? Qt::black : Qt::white);
  94         p.drawText(label_rect, Qt::AlignCenter | Qt::AlignVCenter, _name);
  95 }
  96
  97 } // namespace pv