ganeswidgets/src/hgspring.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 27 May 2010 13:59:05 +0300
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Revision: 201019 Kit: 2010121
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#include "HgSpring.h"
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#include <qtimer>
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#include "trace.h"
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const int KTimeDelta(10);
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const qreal KTimeDeltaF(0.01f);
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//const qreal KVelocitySnap(0.05f);
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const qreal KPositionSnap(0.01f);
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const int KTimerInterval(10);
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HgSpring::HgSpring() :
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mStartPos(QPointF(0,0)),
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mPos(QPointF(0,0)),
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mEndPos(QPointF(0,0)),
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mVelocity(QPointF(0,0)),
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mK(30.1),
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mDamping(10.1),
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mAccumulator(0.0),
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mDoNotUpdate(false)
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{
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    mTimer = new QTimer(this);
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    QObject::connect( mTimer, SIGNAL( timeout() ), this, SLOT( update() ) );
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}
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HgSpring::~HgSpring()
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{
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}
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void HgSpring::setK(qreal k)
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{
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    mK = k;
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}
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void HgSpring::setDamping(qreal damping)
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{
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    mDamping = damping;
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}
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void HgSpring::animateToPos(const QPointF& pos)
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{
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    mStartPos = mPos;
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    mEndPos = pos;
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    emit started();
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    if (!mTimer->isActive())
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    {
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        mTimer->start(KTimerInterval);
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        mPrevTime.start();
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    }
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}
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void HgSpring::gotoPos(const QPointF& pos)
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{
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    if (mTimer->isActive())
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    {
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        mTimer->stop();
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    }
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    mPos = pos;
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    mEndPos = pos;
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}
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void HgSpring::cancel()
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{
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    if (mTimer->isActive()) {
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        mEndPos = mPos;
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        emit ended();
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        mTimer->stop(); 
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    }
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0
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}
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const QPointF& HgSpring::startPos() const
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{
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    return mStartPos;
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}
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const QPointF& HgSpring::pos() const
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{
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    return mPos;
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}
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const QPointF& HgSpring::endPos() const
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{
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    return mEndPos;
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}
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const QPointF& HgSpring::velocity() const
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{
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    return mVelocity;
0
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}
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void HgSpring::update()
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{
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    int deltaTime = mPrevTime.elapsed();
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    mPrevTime.start();
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    mAccumulator += deltaTime;
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   121
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   122
    bool stopped = false;
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   123
    while (mAccumulator >= KTimeDelta)
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   124
    {
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        QPointF delta = mEndPos - mPos;
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   126
        QPointF force = delta * mK - mVelocity * mDamping;
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   127
        mVelocity += force * KTimeDeltaF;
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   128
        mPos += mVelocity * KTimeDeltaF;
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   129
        if ( (qAbs(mPos.x() - mEndPos.x()) < KPositionSnap &&
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              qAbs(mPos.y() - mEndPos.y()) < KPositionSnap) )
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        {
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            mPos = mEndPos;
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            mAccumulator = 0;
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   134
            mVelocity = QPointF(0,0);
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   135
            mTimer->stop();
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   136
            stopped = true;
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   137
            break;
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   138
        }
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   139
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   140
        mAccumulator -= KTimeDelta;
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   141
    }
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   142
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   143
    if (!mDoNotUpdate)
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   144
        emit updated();
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   145
    
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   146
    if (stopped)
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        emit ended();
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   148
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   149
}
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   150
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   151
bool HgSpring::isActive() const
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{
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   153
    return mTimer->isActive();
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   154
}
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   155
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   156
bool HgSpring::updatePositionIfNeeded()
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   157
{
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   158
    if (isActive() && mPrevTime.elapsed() > KTimeDelta) {
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   159
        mDoNotUpdate = true;
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   160
        update();
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   161
        mDoNotUpdate = false;
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   162
        mTimer->stop();
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   163
        mTimer->start(KTimerInterval);
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   164
        return true;
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   165
    }
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   166
    return false;
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   167
}
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parents:
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   168
3
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parents: 2
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   169
void HgSpring::resetVelocity()
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parents: 2
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   170
{
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parents: 2
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   171
    mVelocity = QPointF(0,0);
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parents: 2
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   172
}
0
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parents:
diff changeset
   173