/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the examples of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "mouse.h"+
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+
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#include <QGraphicsScene>+
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#include <QPainter>+
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#include <QStyleOption>+
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+
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#include <math.h>+
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+
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static const double Pi = 3.14159265358979323846264338327950288419717;+
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static double TwoPi = 2.0 * Pi;+
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+
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static qreal normalizeAngle(qreal angle)+
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{+
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    while (angle < 0)+
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        angle += TwoPi;+
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    while (angle > TwoPi)+
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        angle -= TwoPi;+
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    return angle;+
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}+
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+
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//! [0]+
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Mouse::Mouse()+
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    : angle(0), speed(0), mouseEyeDirection(0),+
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      color(qrand() % 256, qrand() % 256, qrand() % 256)+
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{+
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    setRotation(qrand() % (360 * 16));+
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}+
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//! [0]+
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+
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//! [1]+
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QRectF Mouse::boundingRect() const+
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{+
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    qreal adjust = 0.5;+
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    return QRectF(-18 - adjust, -22 - adjust,+
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                  36 + adjust, 60 + adjust);+
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}+
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//! [1]+
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+
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//! [2]+
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QPainterPath Mouse::shape() const+
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{+
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    QPainterPath path;+
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    path.addRect(-10, -20, 20, 40);+
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    return path;+
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}+
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//! [2]+
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+
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//! [3]+
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void Mouse::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)+
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{+
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    // Body+
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    painter->setBrush(color);+
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    painter->drawEllipse(-10, -20, 20, 40);+
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+
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    // Eyes+
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    painter->setBrush(Qt::white);+
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    painter->drawEllipse(-10, -17, 8, 8);+
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    painter->drawEllipse(2, -17, 8, 8);+
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+
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    // Nose+
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    painter->setBrush(Qt::black);+
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    painter->drawEllipse(QRectF(-2, -22, 4, 4));+
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+
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    // Pupils+
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    painter->drawEllipse(QRectF(-8.0 + mouseEyeDirection, -17, 4, 4));+
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    painter->drawEllipse(QRectF(4.0 + mouseEyeDirection, -17, 4, 4));+
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+
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    // Ears+
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    painter->setBrush(scene()->collidingItems(this).isEmpty() ? Qt::darkYellow : Qt::red);+
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    painter->drawEllipse(-17, -12, 16, 16);+
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    painter->drawEllipse(1, -12, 16, 16);+
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+
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    // Tail+
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    QPainterPath path(QPointF(0, 20));+
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    path.cubicTo(-5, 22, -5, 22, 0, 25);+
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    path.cubicTo(5, 27, 5, 32, 0, 30);+
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    path.cubicTo(-5, 32, -5, 42, 0, 35);+
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    painter->setBrush(Qt::NoBrush);+
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    painter->drawPath(path);+
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}+
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//! [3]+
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+
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//! [4]+
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void Mouse::advance(int step)+
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{+
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    if (!step)+
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        return;+
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//! [4]+
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    // Don't move too far away+
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//! [5]+
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    QLineF lineToCenter(QPointF(0, 0), mapFromScene(0, 0));+
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    if (lineToCenter.length() > 150) {+
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        qreal angleToCenter = ::acos(lineToCenter.dx() / lineToCenter.length());+
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        if (lineToCenter.dy() < 0)+
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            angleToCenter = TwoPi - angleToCenter;+
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        angleToCenter = normalizeAngle((Pi - angleToCenter) + Pi / 2);+
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+
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        if (angleToCenter < Pi && angleToCenter > Pi / 4) {+
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            // Rotate left+
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            angle += (angle < -Pi / 2) ? 0.25 : -0.25;+
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        } else if (angleToCenter >= Pi && angleToCenter < (Pi + Pi / 2 + Pi / 4)) {+
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            // Rotate right+
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            angle += (angle < Pi / 2) ? 0.25 : -0.25;+
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        }+
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    } else if (::sin(angle) < 0) {+
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        angle += 0.25;+
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    } else if (::sin(angle) > 0) {+
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        angle -= 0.25;+
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//! [5] //! [6]+
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    }+
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//! [6]+
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+
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    // Try not to crash with any other mice+
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//! [7]+
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    QList<QGraphicsItem *> dangerMice = scene()->items(QPolygonF()+
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                                                       << mapToScene(0, 0)+
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                                                       << mapToScene(-30, -50)+
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                                                       << mapToScene(30, -50));+
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    foreach (QGraphicsItem *item, dangerMice) {+
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        if (item == this)+
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            continue;+
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        +
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        QLineF lineToMouse(QPointF(0, 0), mapFromItem(item, 0, 0));+
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        qreal angleToMouse = ::acos(lineToMouse.dx() / lineToMouse.length());+
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        if (lineToMouse.dy() < 0)+
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            angleToMouse = TwoPi - angleToMouse;+
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        angleToMouse = normalizeAngle((Pi - angleToMouse) + Pi / 2);+
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+
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        if (angleToMouse >= 0 && angleToMouse < Pi / 2) {+
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            // Rotate right+
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            angle += 0.5;+
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        } else if (angleToMouse <= TwoPi && angleToMouse > (TwoPi - Pi / 2)) {+
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            // Rotate left+
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            angle -= 0.5;+
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//! [7] //! [8]+
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        }+
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//! [8] //! [9]+
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    }+
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//! [9]+
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+
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    // Add some random movement+
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//! [10]+
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    if (dangerMice.size() > 1 && (qrand() % 10) == 0) {+
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        if (qrand() % 1)+
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            angle += (qrand() % 100) / 500.0;+
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        else+
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            angle -= (qrand() % 100) / 500.0;+
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    }+
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//! [10]+
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+
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//! [11]+
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    speed += (-50 + qrand() % 100) / 100.0;+
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+
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    qreal dx = ::sin(angle) * 10;+
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    mouseEyeDirection = (qAbs(dx / 5) < 1) ? 0 : dx / 5;+
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+
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    setRotation(rotation() + dx);+
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    setPos(mapToParent(0, -(3 + sin(speed) * 3)));+
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}+
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//! [11]+
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