blob: 16e52fb819b0996a305e1459f9f1788c02d827ce (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "shadoweffect.h"
#include <math.h>
ShadowEffect::ShadowEffect(QGraphicsItem *item, QGraphicsItem *source)
: QGraphicsDropShadowEffect()
, item(item), m_lightSource(source)
{
setBlurRadius(8);
m_color = color();
}
void ShadowEffect::adjustForItem()
{
QPointF delta = item->pos() - m_lightSource->pos();
setOffset(delta.toPoint() / 30);
qreal dx = delta.x();
qreal dy = delta.y();
qreal dd = sqrt(dx * dx + dy * dy);
m_color.setAlphaF(qBound(0.4, 1 - dd / 200.0, 0.7));
setColor(m_color);
}
QRectF ShadowEffect::boundingRectFor(const QRectF &rect) const
{
const_cast<ShadowEffect *>(this)->adjustForItem();
return QGraphicsDropShadowEffect::boundingRectFor(rect);
}
void ShadowEffect::draw(QPainter *painter, QGraphicsEffectSource *source)
{
adjustForItem();
QGraphicsDropShadowEffect::draw(painter, source);
}
|
