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 const int Signal::LabelHitPadding = 2;
  29
  30 Signal::Signal(QString name) :
  31         _name(name)
  32 {
  33 }
  34
  35 QString Signal::get_name() const
  36 {
  37         return _name;
  38 }
  39
  40 void Signal::paint_label(QPainter &p, const QRect &rect, bool hover)
  41 {
  42         p.setBrush(get_colour());
  43
  44         const QColor colour = get_colour();
  45         const float nominal_offset = get_nominal_offset(rect);
  46
  47         compute_text_size(p);
  48         const QRectF label_rect = get_label_rect(rect);
  49
  50         // Paint the label
  51         const QPointF points[] = {
  52                 label_rect.topLeft(),
  53                 label_rect.topRight(),
  54                 QPointF(rect.right(), nominal_offset),
  55                 label_rect.bottomRight(),
  56                 label_rect.bottomLeft()
  57         };
  58
  59         const QPointF highlight_points[] = {
  60                 QPointF(label_rect.left() + 1, label_rect.top() + 1),
  61                 QPointF(label_rect.right(), label_rect.top() + 1),
  62                 QPointF(rect.right() - 1, nominal_offset),
  63                 QPointF(label_rect.right(), label_rect.bottom() - 1),
  64                 QPointF(label_rect.left() + 1, label_rect.bottom() - 1)
  65         };
  66
  67         p.setPen(Qt::transparent);
  68         p.setBrush(hover ? colour.lighter() : colour);
  69         p.drawPolygon(points, countof(points));
  70
  71         p.setPen(colour.lighter());
  72         p.setBrush(Qt::transparent);
  73         p.drawPolygon(highlight_points, countof(highlight_points));
  74
  75         p.setPen(colour.darker());
  76         p.setBrush(Qt::transparent);
  77         p.drawPolygon(points, countof(points));
  78
  79         // Paint the text
  80         p.setPen((colour.lightness() > 64) ? Qt::black : Qt::white);
  81         p.drawText(label_rect, Qt::AlignCenter | Qt::AlignVCenter, _name);
  82 }
  83
  84 bool Signal::pt_in_label_rect(const QRect &rect, const QPoint &point)
  85 {
  86         const QRectF label = get_label_rect(rect);
  87         return QRectF(
  88                 QPointF(label.left() - LabelHitPadding,
  89                         label.top() - LabelHitPadding),
  90                 QPointF(rect.right(),
  91                         label.bottom() + LabelHitPadding)
  92                 ).contains(point);
  93 }
  94
  95 void Signal::compute_text_size(QPainter &p)
  96 {
  97         _text_size = p.boundingRect(QRectF(), 0, _name).size();
  98 }
  99
 100 QRectF Signal::get_label_rect(const QRect &rect)
 101 {
 102         const float nominal_offset = get_nominal_offset(rect);
 103         const QSizeF label_size(
 104                 _text_size.width() + LabelPadding.width() * 2,
 105                 _text_size.height() + LabelPadding.height() * 2);
 106         const float label_arrow_length = label_size.height() / 2;
 107         return QRectF(
 108                 rect.right() - label_arrow_length - label_size.width(),
 109                 nominal_offset - label_size.height() / 2,
 110                 label_size.width(), label_size.height());
 111 }
 112
 113 } // namespace pv