Moved view classes into the pv::view:: namespace
[pulseview.git] / 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 }