/****************************************************************************+
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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 demonstration applications 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 <cmath>+
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#include "guide.h"+
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#include "colors.h"+
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+
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Guide::Guide(Guide *follows)+
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{+
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    this->scaleX = 1.0;+
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    this->scaleY = 1.0;+
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+
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    if (follows){+
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        while (follows->nextGuide != follows->firstGuide) // append to end+
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            follows = follows->nextGuide;+
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+
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        follows->nextGuide = this;+
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        this->prevGuide = follows;+
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        this->firstGuide = follows->firstGuide;+
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        this->nextGuide = follows->firstGuide;+
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        this->startLength = int(follows->startLength + follows->length()) + 1;+
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    }+
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    else{+
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        this->prevGuide = this;+
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        this->firstGuide = this;+
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        this->nextGuide = this;+
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        this->startLength = 0;+
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    }+
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}+
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+
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void Guide::setScale(float scaleX, float scaleY, bool all)+
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{+
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    this->scaleX = scaleX;+
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    this->scaleY = scaleY;+
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+
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    if (all){+
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        Guide *next = this->nextGuide;+
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        while(next != this){+
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            next->scaleX = scaleX;+
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            next->scaleY = scaleY;+
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            next = next->nextGuide;+
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        }+
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    }+
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}+
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+
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void Guide::setFence(const QRectF &fence, bool all)+
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{+
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    this->fence = fence;+
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+
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    if (all){+
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        Guide *next = this->nextGuide;+
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        while(next != this){+
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            next->fence = fence;+
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            next = next->nextGuide;+
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        }+
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    }+
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}+
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+
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Guide::~Guide()+
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{+
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    if (this != this->nextGuide && this->nextGuide != this->firstGuide)+
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        delete this->nextGuide;+
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}+
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+
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float Guide::lengthAll()+
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{+
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    float len = length();+
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    Guide *next = this->nextGuide;+
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    while(next != this){+
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        len += next->length();+
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        next = next->nextGuide;+
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    }+
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    return len;+
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}+
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+
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void Guide::move(DemoItem *item, QPointF &dest, float moveSpeed)+
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{+
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    QLineF walkLine(item->getGuidedPos(), dest);+
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    if (moveSpeed >= 0 && walkLine.length() > moveSpeed){+
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        // The item is too far away from it's destination point.+
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        // So we choose to move it towards it instead.+
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        float dx = walkLine.dx();+
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        float dy = walkLine.dy();+
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+
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        if (qAbs(dx) > qAbs(dy)){+
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            // walk along x-axis+
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            if (dx != 0){+
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                float d = moveSpeed * dy / qAbs(dx);+
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                float s = dx > 0 ? moveSpeed : -moveSpeed;+
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                dest.setX(item->getGuidedPos().x() + s);+
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                dest.setY(item->getGuidedPos().y() + d);+
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            }+
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        }+
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        else{+
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            // walk along y-axis+
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            if (dy != 0){+
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                float d = moveSpeed * dx / qAbs(dy);+
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                float s = dy > 0 ? moveSpeed : -moveSpeed;+
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                dest.setX(item->getGuidedPos().x() + d);+
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                dest.setY(item->getGuidedPos().y() + s);+
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            }+
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        }+
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    }+
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+
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    item->setGuidedPos(dest);+
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}+
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