1 | /****************************************************************************
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2 | **
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3 | ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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4 | ** All rights reserved.
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5 | ** Contact: Nokia Corporation (qt-info@nokia.com)
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6 | **
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7 | ** This file is part of the examples of the Qt Toolkit.
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8 | **
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9 | ** $QT_BEGIN_LICENSE:LGPL$
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10 | ** Commercial Usage
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11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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12 | ** accordance with the Qt Commercial License Agreement provided with the
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13 | ** Software or, alternatively, in accordance with the terms contained in
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14 | ** a written agreement between you and Nokia.
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15 | **
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16 | ** GNU Lesser General Public License Usage
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17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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18 | ** General Public License version 2.1 as published by the Free Software
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19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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20 | ** packaging of this file. Please review the following information to
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21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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23 | **
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24 | ** In addition, as a special exception, Nokia gives you certain additional
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25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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27 | **
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28 | ** GNU General Public License Usage
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29 | ** Alternatively, this file may be used under the terms of the GNU
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30 | ** General Public License version 3.0 as published by the Free Software
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31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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32 | ** packaging of this file. Please review the following information to
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33 | ** ensure the GNU General Public License version 3.0 requirements will be
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34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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35 | **
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36 | ** If you have questions regarding the use of this file, please contact
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37 | ** Nokia at qt-info@nokia.com.
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38 | ** $QT_END_LICENSE$
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39 | **
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40 | ****************************************************************************/
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41 |
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42 | #include "lighting.h"
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43 |
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44 | #include <QtGui>
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45 |
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46 | #ifndef M_PI
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47 | #define M_PI 3.14159265358979323846
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48 | #endif
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49 |
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50 | Lighting::Lighting(QWidget *parent): QGraphicsView(parent), angle(0.0)
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51 | {
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52 | setScene(&m_scene);
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53 |
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54 | setupScene();
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55 |
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56 | QTimer *timer = new QTimer(this);
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57 | connect(timer, SIGNAL(timeout()), SLOT(animate()));
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58 | timer->setInterval(30);
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59 | timer->start();
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60 |
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61 | setRenderHint(QPainter::Antialiasing, true);
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62 | setFrameStyle(QFrame::NoFrame);
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63 | }
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64 |
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65 | void Lighting::setupScene()
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66 | {
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67 | m_scene.setSceneRect(-300, -200, 600, 460);
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68 |
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69 | QLinearGradient linearGrad(QPointF(-100, -100), QPointF(100, 100));
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70 | linearGrad.setColorAt(0, QColor(255, 255, 255));
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71 | linearGrad.setColorAt(1, QColor(192, 192, 255));
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72 | setBackgroundBrush(linearGrad);
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73 |
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74 | QRadialGradient radialGrad(30, 30, 30);
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75 | radialGrad.setColorAt(0, Qt::yellow);
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76 | radialGrad.setColorAt(0.2, Qt::yellow);
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77 | radialGrad.setColorAt(1, Qt::transparent);
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78 | QPixmap pixmap(60, 60);
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79 | pixmap.fill(Qt::transparent);
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80 | QPainter painter(&pixmap);
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81 | painter.setPen(Qt::NoPen);
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82 | painter.setBrush(radialGrad);
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83 | painter.drawEllipse(0, 0, 60, 60);
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84 | painter.end();
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85 |
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86 | m_lightSource = m_scene.addPixmap(pixmap);
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87 | m_lightSource->setZValue(2);
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88 |
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89 | for (int i = -2; i < 3; ++i)
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90 | for (int j = -2; j < 3; ++j) {
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91 | QAbstractGraphicsShapeItem *item;
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92 | if ((i + j) & 1)
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93 | item = new QGraphicsEllipseItem(0, 0, 50, 50);
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94 | else
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95 | item = new QGraphicsRectItem(0, 0, 50, 50);
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96 |
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97 | item->setPen(QPen(Qt::black, 1));
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98 | item->setBrush(QBrush(Qt::white));
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99 | QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect;
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100 | effect->setBlurRadius(8);
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101 | item->setGraphicsEffect(effect);
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102 | item->setZValue(1);
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103 | item->setPos(i * 80, j * 80);
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104 | m_scene.addItem(item);
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105 | m_items << item;
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106 | }
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107 |
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108 |
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109 | }
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110 |
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111 | void Lighting::animate()
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112 | {
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113 | angle += (M_PI / 30);
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114 | qreal xs = 200 * sin(angle) - 40 + 25;
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115 | qreal ys = 200 * cos(angle) - 40 + 25;
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116 | m_lightSource->setPos(xs, ys);
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117 |
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118 | for (int i = 0; i < m_items.size(); ++i) {
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119 | QGraphicsItem *item = m_items.at(i);
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120 | Q_ASSERT(item);
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121 | QGraphicsDropShadowEffect *effect = static_cast<QGraphicsDropShadowEffect *>(item->graphicsEffect());
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122 | Q_ASSERT(effect);
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123 |
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124 | QPointF delta(item->x() - xs, item->y() - ys);
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125 | effect->setOffset(delta.toPoint() / 30);
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126 |
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127 | qreal dx = delta.x();
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128 | qreal dy = delta.y();
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129 | qreal dd = sqrt(dx * dx + dy * dy);
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130 | QColor color = effect->color();
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131 | color.setAlphaF(qBound(0.4, 1 - dd / 200.0, 0.7));
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132 | effect->setColor(color);
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133 | }
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134 |
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135 | m_scene.update();
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136 | }
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137 |
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