ganeswidgets/src/hgtransformedquadrenderer.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 14 May 2010 16:57:01 +0300
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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 "hgtransformedquadrenderer.h"
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#include "hgquad.h"
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#include "hgtransformedquad.h"
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#include "trace.h"
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#include "hgimage.h"
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#include <qvector2d>
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#include <qpolygon>
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#include <qmatrix4x4>
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#include <qpainter>
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HgTransformedQuadRenderer::HgTransformedQuadRenderer(int maxQuads) : 
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    HgQuadRenderer(maxQuads)
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{
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}
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HgTransformedQuadRenderer::~HgTransformedQuadRenderer()
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{
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    qDeleteAll(mTransformedQuads.begin(), mTransformedQuads.end());
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}
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void HgTransformedQuadRenderer::init(int maxQuads)
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{
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    for (int i = 0; i < maxQuads; i++)
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    {
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        mTransformedQuads.append(createNativeQuad());
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    }    
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}
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HgQuad* HgTransformedQuadRenderer::getQuadAt(const QPointF& point) const
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{
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    QList<HgTransformedQuad*>::const_iterator i = mSortedQuads.begin();
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    while(i != mSortedQuads.end())
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    {
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        HgTransformedQuad* q = (*i);
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        if (q->isPointInside(point))
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        {
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            return q->quad();
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        }
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        i++;
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    }
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    return NULL;
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}
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void HgTransformedQuadRenderer::transformQuads(const QMatrix4x4& view, const QMatrix4x4& proj, 
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    const QPointF& center, const QSizeF& windowSize)
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{
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    QMatrix4x4 pv = proj * view;
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    mSortedQuads.clear();
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    for (int i = 0; i < mQuads.size(); i++)
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    {
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        HgQuad* q = mQuads[i];
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        HgTransformedQuad* tq = mTransformedQuads[i];
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        if (q->visible())
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        {
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            tq->transformQuad(i, pv, q, mMirroringPlaneY, mTranslation, center, windowSize);   
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            mSortedQuads.append(tq);
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        }
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    }
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    qSort(mSortedQuads.begin(), mSortedQuads.end(), HgTransformedQuad::quadSorter);
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}
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bool HgTransformedQuadRenderer::getQuadTranformedPointsByUserData(QPolygonF& points, const QVariant& userData) const
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{    
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    for (int i = 0; i < mSortedQuads.count(); i++)
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    {
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        HgTransformedQuad* quad = mSortedQuads[i];
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        if (quad->quad())
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        {
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            if (quad->quad()->userData() == userData)
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            {
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                quad->getTransformedPoints(points);
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                return true;                
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            }                
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        }
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    }
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    return false;
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}
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QList<HgQuad*> HgTransformedQuadRenderer::getVisibleQuads(const QRectF& rect) const
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{
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    // this implementation isn't 100% precise
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    QList<HgQuad*> result;
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    for (int i = 0; i < mSortedQuads.count(); i++) {
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       QPolygonF poly;
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       mSortedQuads[i]->getTransformedPoints(poly);
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       QRectF bounds = poly.boundingRect();       
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       if (bounds.intersects(rect) || rect.contains(bounds)) {
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           result.append(mSortedQuads[i]->quad());
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       }           
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    }
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    return result;    
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}
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void HgTransformedQuadRenderer::drawTransformedQuads(QPainter* painter, const QRectF& rect)
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{
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    // draw quads
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    for (int i = 0; i < mSortedQuads.size(); i++)
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    {
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        mSortedQuads[i]->draw(painter, rect);
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    }    
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}