[556] | 1 | /****************************************************************************
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| 2 | **
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[846] | 3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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[556] | 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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[846] | 9 | ** $QT_BEGIN_LICENSE:BSD$
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| 10 | ** You may use this file under the terms of the BSD license as follows:
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[556] | 11 | **
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[846] | 12 | ** "Redistribution and use in source and binary forms, with or without
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| 13 | ** modification, are permitted provided that the following conditions are
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| 14 | ** met:
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| 15 | ** * Redistributions of source code must retain the above copyright
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| 16 | ** notice, this list of conditions and the following disclaimer.
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| 17 | ** * Redistributions in binary form must reproduce the above copyright
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| 18 | ** notice, this list of conditions and the following disclaimer in
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| 19 | ** the documentation and/or other materials provided with the
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| 20 | ** distribution.
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| 21 | ** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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| 22 | ** the names of its contributors may be used to endorse or promote
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| 23 | ** products derived from this software without specific prior written
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| 24 | ** permission.
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[556] | 25 | **
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[846] | 26 | ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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| 27 | ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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| 28 | ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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| 29 | ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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| 30 | ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 31 | ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 32 | ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 33 | ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 34 | ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 35 | ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 36 | ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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[556] | 37 | ** $QT_END_LICENSE$
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| 38 | **
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| 39 | ****************************************************************************/
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| 40 |
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| 41 | #include "lighting.h"
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| 42 |
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| 43 | #include <QtGui>
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| 44 |
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| 45 | #ifndef M_PI
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| 46 | #define M_PI 3.14159265358979323846
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| 47 | #endif
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| 48 |
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| 49 | Lighting::Lighting(QWidget *parent): QGraphicsView(parent), angle(0.0)
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| 50 | {
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| 51 | setScene(&m_scene);
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| 52 |
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| 53 | setupScene();
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| 54 |
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| 55 | QTimer *timer = new QTimer(this);
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| 56 | connect(timer, SIGNAL(timeout()), SLOT(animate()));
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| 57 | timer->setInterval(30);
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| 58 | timer->start();
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| 59 |
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| 60 | setRenderHint(QPainter::Antialiasing, true);
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| 61 | setFrameStyle(QFrame::NoFrame);
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| 62 | }
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| 63 |
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| 64 | void Lighting::setupScene()
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| 65 | {
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| 66 | m_scene.setSceneRect(-300, -200, 600, 460);
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| 67 |
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| 68 | QLinearGradient linearGrad(QPointF(-100, -100), QPointF(100, 100));
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| 69 | linearGrad.setColorAt(0, QColor(255, 255, 255));
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| 70 | linearGrad.setColorAt(1, QColor(192, 192, 255));
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| 71 | setBackgroundBrush(linearGrad);
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| 72 |
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| 73 | QRadialGradient radialGrad(30, 30, 30);
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| 74 | radialGrad.setColorAt(0, Qt::yellow);
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| 75 | radialGrad.setColorAt(0.2, Qt::yellow);
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| 76 | radialGrad.setColorAt(1, Qt::transparent);
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| 77 | QPixmap pixmap(60, 60);
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| 78 | pixmap.fill(Qt::transparent);
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| 79 | QPainter painter(&pixmap);
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| 80 | painter.setPen(Qt::NoPen);
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| 81 | painter.setBrush(radialGrad);
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| 82 | painter.drawEllipse(0, 0, 60, 60);
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| 83 | painter.end();
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| 84 |
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| 85 | m_lightSource = m_scene.addPixmap(pixmap);
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| 86 | m_lightSource->setZValue(2);
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| 87 |
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| 88 | for (int i = -2; i < 3; ++i)
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| 89 | for (int j = -2; j < 3; ++j) {
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| 90 | QAbstractGraphicsShapeItem *item;
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| 91 | if ((i + j) & 1)
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| 92 | item = new QGraphicsEllipseItem(0, 0, 50, 50);
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| 93 | else
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| 94 | item = new QGraphicsRectItem(0, 0, 50, 50);
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| 95 |
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| 96 | item->setPen(QPen(Qt::black, 1));
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| 97 | item->setBrush(QBrush(Qt::white));
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| 98 | QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect;
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| 99 | effect->setBlurRadius(8);
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| 100 | item->setGraphicsEffect(effect);
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| 101 | item->setZValue(1);
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| 102 | item->setPos(i * 80, j * 80);
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| 103 | m_scene.addItem(item);
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| 104 | m_items << item;
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| 105 | }
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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 | void Lighting::animate()
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| 111 | {
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| 112 | angle += (M_PI / 30);
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| 113 | qreal xs = 200 * sin(angle) - 40 + 25;
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| 114 | qreal ys = 200 * cos(angle) - 40 + 25;
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| 115 | m_lightSource->setPos(xs, ys);
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| 116 |
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| 117 | for (int i = 0; i < m_items.size(); ++i) {
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| 118 | QGraphicsItem *item = m_items.at(i);
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| 119 | Q_ASSERT(item);
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| 120 | QGraphicsDropShadowEffect *effect = static_cast<QGraphicsDropShadowEffect *>(item->graphicsEffect());
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| 121 | Q_ASSERT(effect);
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| 122 |
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| 123 | QPointF delta(item->x() - xs, item->y() - ys);
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| 124 | effect->setOffset(delta.toPoint() / 30);
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| 125 |
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| 126 | qreal dx = delta.x();
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| 127 | qreal dy = delta.y();
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| 128 | qreal dd = sqrt(dx * dx + dy * dy);
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| 129 | QColor color = effect->color();
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| 130 | color.setAlphaF(qBound(0.4, 1 - dd / 200.0, 0.7));
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| 131 | effect->setColor(color);
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| 132 | }
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| 133 |
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| 134 | m_scene.update();
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| 135 | }
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| 136 |
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