0
|
1 |
/****************************************************************************
|
|
2 |
**
|
|
3 |
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
|
|
4 |
** All rights reserved.
|
|
5 |
** Contact: Nokia Corporation (qt-info@nokia.com)
|
|
6 |
**
|
|
7 |
** This file is part of the examples of the Qt Toolkit.
|
|
8 |
**
|
|
9 |
** $QT_BEGIN_LICENSE:LGPL$
|
|
10 |
** No Commercial Usage
|
|
11 |
** This file contains pre-release code and may not be distributed.
|
|
12 |
** You may use this file in accordance with the terms and conditions
|
|
13 |
** contained in the Technology Preview License Agreement accompanying
|
|
14 |
** this package.
|
|
15 |
**
|
|
16 |
** GNU Lesser General Public License Usage
|
|
17 |
** Alternatively, this file may be used under the terms of the GNU Lesser
|
|
18 |
** General Public License version 2.1 as published by the Free Software
|
|
19 |
** Foundation and appearing in the file LICENSE.LGPL included in the
|
|
20 |
** packaging of this file. Please review the following information to
|
|
21 |
** ensure the GNU Lesser General Public License version 2.1 requirements
|
|
22 |
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
|
|
23 |
**
|
|
24 |
** In addition, as a special exception, Nokia gives you certain additional
|
|
25 |
** rights. These rights are described in the Nokia Qt LGPL Exception
|
|
26 |
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
|
|
27 |
**
|
|
28 |
** If you have questions regarding the use of this file, please contact
|
|
29 |
** Nokia at qt-info@nokia.com.
|
|
30 |
**
|
|
31 |
**
|
|
32 |
**
|
|
33 |
**
|
|
34 |
**
|
|
35 |
**
|
|
36 |
**
|
|
37 |
**
|
|
38 |
** $QT_END_LICENSE$
|
|
39 |
**
|
|
40 |
****************************************************************************/
|
|
41 |
|
|
42 |
#include "lighting.h"
|
|
43 |
|
|
44 |
#include <QtGui>
|
|
45 |
|
|
46 |
#ifndef M_PI
|
|
47 |
#define M_PI 3.14159265358979323846
|
|
48 |
#endif
|
|
49 |
|
|
50 |
Lighting::Lighting(QWidget *parent): QGraphicsView(parent), angle(0.0)
|
|
51 |
{
|
|
52 |
setScene(&m_scene);
|
|
53 |
|
|
54 |
setupScene();
|
|
55 |
|
|
56 |
QTimer *timer = new QTimer(this);
|
|
57 |
connect(timer, SIGNAL(timeout()), SLOT(animate()));
|
|
58 |
timer->setInterval(30);
|
|
59 |
timer->start();
|
|
60 |
|
|
61 |
setRenderHint(QPainter::Antialiasing, true);
|
|
62 |
setFrameStyle(QFrame::NoFrame);
|
|
63 |
}
|
|
64 |
|
|
65 |
void Lighting::setupScene()
|
|
66 |
{
|
|
67 |
m_scene.setSceneRect(-300, -200, 600, 460);
|
|
68 |
|
|
69 |
QLinearGradient linearGrad(QPointF(-100, -100), QPointF(100, 100));
|
|
70 |
linearGrad.setColorAt(0, QColor(255, 255, 255));
|
|
71 |
linearGrad.setColorAt(1, QColor(192, 192, 255));
|
|
72 |
setBackgroundBrush(linearGrad);
|
|
73 |
|
|
74 |
QRadialGradient radialGrad(30, 30, 30);
|
|
75 |
radialGrad.setColorAt(0, Qt::yellow);
|
|
76 |
radialGrad.setColorAt(0.2, Qt::yellow);
|
|
77 |
radialGrad.setColorAt(1, Qt::transparent);
|
|
78 |
QPixmap pixmap(60, 60);
|
|
79 |
pixmap.fill(Qt::transparent);
|
|
80 |
QPainter painter(&pixmap);
|
|
81 |
painter.setPen(Qt::NoPen);
|
|
82 |
painter.setBrush(radialGrad);
|
|
83 |
painter.drawEllipse(0, 0, 60, 60);
|
|
84 |
painter.end();
|
|
85 |
|
|
86 |
m_lightSource = m_scene.addPixmap(pixmap);
|
|
87 |
m_lightSource->setZValue(2);
|
|
88 |
|
|
89 |
for (int i = -2; i < 3; ++i)
|
|
90 |
for (int j = -2; j < 3; ++j) {
|
|
91 |
QAbstractGraphicsShapeItem *item;
|
|
92 |
if ((i + j) & 1)
|
|
93 |
item = new QGraphicsEllipseItem(0, 0, 50, 50);
|
|
94 |
else
|
|
95 |
item = new QGraphicsRectItem(0, 0, 50, 50);
|
|
96 |
|
|
97 |
item->setPen(QPen(Qt::black));
|
|
98 |
item->setBrush(QBrush(Qt::white));
|
|
99 |
QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect;
|
|
100 |
effect->setBlurRadius(8);
|
|
101 |
item->setGraphicsEffect(effect);
|
|
102 |
item->setZValue(1);
|
|
103 |
item->setPos(i * 80, j * 80);
|
|
104 |
m_scene.addItem(item);
|
|
105 |
m_items << item;
|
|
106 |
}
|
|
107 |
|
|
108 |
|
|
109 |
}
|
|
110 |
|
|
111 |
void Lighting::animate()
|
|
112 |
{
|
|
113 |
angle += (M_PI / 30);
|
|
114 |
qreal xs = 200 * sin(angle) - 40 + 25;
|
|
115 |
qreal ys = 200 * cos(angle) - 40 + 25;
|
|
116 |
m_lightSource->setPos(xs, ys);
|
|
117 |
|
|
118 |
for (int i = 0; i < m_items.size(); ++i) {
|
|
119 |
QGraphicsItem *item = m_items.at(i);
|
|
120 |
Q_ASSERT(item);
|
|
121 |
QGraphicsDropShadowEffect *effect = static_cast<QGraphicsDropShadowEffect *>(item->graphicsEffect());
|
|
122 |
Q_ASSERT(effect);
|
|
123 |
|
|
124 |
QPointF delta(item->x() - xs, item->y() - ys);
|
|
125 |
effect->setOffset(delta.toPoint() / 30);
|
|
126 |
|
|
127 |
qreal dx = delta.x();
|
|
128 |
qreal dy = delta.y();
|
|
129 |
qreal dd = sqrt(dx * dx + dy * dy);
|
|
130 |
QColor color = effect->color();
|
|
131 |
color.setAlphaF(qBound(0.4, 1 - dd / 200.0, 0.7));
|
|
132 |
effect->setColor(color);
|
|
133 |
}
|
|
134 |
|
|
135 |
m_scene.update();
|
|
136 |
}
|
|
137 |
|