ganeswidgets/src/hgtransformedquad.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 11 Jun 2010 14:43:11 +0300
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permissions -rw-r--r--
Revision: 201021 Kit: 2010123
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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 "hgtransformedquad.h"
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#include "hgquad.h"
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#include "trace.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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    HgTransformedQuad::HgTransformedQuad(qreal yDir) : mYDir(yDir)
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    {
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    }
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    HgTransformedQuad::~HgTransformedQuad()
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    {
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    }
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    int HgTransformedQuad::index() const
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        {
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        return mIndex;
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        }
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    bool HgTransformedQuad::isPointInside(const QPointF& point) const
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    {    
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        QPolygonF poly;
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        getTransformedPoints(poly);
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        QRectF rect = poly.boundingRect();
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        if (rect.contains(point))
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        {
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            return true;
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        }
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        return false;
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    }
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    void HgTransformedQuad::transformQuad(int index, const QMatrix4x4& projView, HgQuad* quad, 
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        qreal mirroringPlaneY, const QVector2D& translate, const QPointF& center, 
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        const QSizeF& windowSize)
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    {
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        mIndex = index;
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        mQuad = quad;
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        QMatrix4x4 tm;
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        tm.setToIdentity();
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        tm.rotate(quad->outerRotation());
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        if (mQuad->mirrorImageEnabled())
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        {
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            computeMirroredPoints(tm, projView, mirroringPlaneY, translate, center, windowSize);
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        }
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        tm.translate(quad->position());    
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        tm.rotate(quad->rotation());    
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        tm.scale(quad->scale().x(), quad->scale().y());
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        tm = projView * tm;         
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        perspectiveTransformPoints(mTransformedPoints, tm, center, windowSize);
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        for (int i = 0; i < 4; i++)
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            mTransformedPoints[i] += translate;
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    }
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    void HgTransformedQuad::getTransformedPoints(QPolygonF& poly) const
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    {
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        poly.clear();
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        poly.append(mTransformedPoints[0].toPointF());
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        poly.append(mTransformedPoints[1].toPointF());
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        poly.append(mTransformedPoints[2].toPointF());
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        poly.append(mTransformedPoints[3].toPointF());    
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    }
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    bool HgTransformedQuad::quadSorter(HgTransformedQuad* a, HgTransformedQuad* b)
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    {
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        return a->mQuad->position().z() < b->mQuad->position().z();
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    }
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    HgQuad* HgTransformedQuad::quad() const
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    {
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        return mQuad;
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    }
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    void HgTransformedQuad::computeMirroredPoints(const QMatrix4x4& trans, const QMatrix4x4& projView, 
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        qreal mirroringPlaneY, const QVector2D& translate, const QPointF& center, 
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        const QSizeF& windowSize)
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    {
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        HgQuad* quad = mQuad;
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        QMatrix4x4 mirror = trans;
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        qreal distToPlane = qAbs(quad->position().y() - mirroringPlaneY);
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        mirror.translate(quad->position().x(), mirroringPlaneY - distToPlane/1, quad->position().z());
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        mirror.scale(quad->scale().x(), -quad->scale().y()/1);
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        mirror.rotate(quad->rotation());
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        QMatrix4x4 modelViewProjMatrix = projView * mirror;
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        perspectiveTransformPoints(mMirroredPoints, modelViewProjMatrix, center, windowSize);    
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        for (int i = 0; i < 4; i++)
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            mMirroredPoints[i] += translate;
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    }
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    void HgTransformedQuad::perspectiveTransformPoints(QVector2D* outPoints, const QMatrix4x4& matrix, 
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        const QPointF& center, const QSizeF& windowSize)
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    {
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        const QVector4D points[] = 
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        {
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            QVector4D(-0.5f, -0.5f, 0.0f, 1.0f),
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            QVector4D( 0.5f, -0.5f, 0.0f, 1.0f),
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            QVector4D( 0.5f,  0.5f, 0.0f, 1.0f),
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            QVector4D(-0.5f,  0.5f, 0.0f, 1.0f)
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        };
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        qreal hw = windowSize.width() * 0.5f;
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        qreal hh = windowSize.height() * 0.5f;
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        for (int i = 0; i < 4; i++)
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        {
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            QVector4D temp = matrix * points[i];
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            outPoints[i] = QVector2D(
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                center.x() + temp.x() / temp.w() * hw, 
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                center.y() + (temp.y() / temp.w() * hh) * mYDir);
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        }
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    }
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