/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:    

*

*/

#include "hgtransformedquad.h"

#include "hgquad.h"

#include "trace.h"

#include <QVector2D>

#include <QPolygon>

#include <QMatrix4x4>

#include <QPainter>

    HgTransformedQuad::HgTransformedQuad(qreal yDir) : mYDir(yDir)

    {

    }

    HgTransformedQuad::~HgTransformedQuad()

    {

    }

    int HgTransformedQuad::index() const

        {

        return mIndex;

        }

    bool HgTransformedQuad::isPointInside(const QPointF& point) const

    {    

        QPolygonF poly;

        getTransformedPoints(poly);

        QRectF rect = poly.boundingRect();

        if (rect.contains(point))

        {

            return true;

        }

        return false;

    }

    void HgTransformedQuad::transformQuad(int index, const QMatrix4x4& projView, HgQuad* quad, 

        qreal mirroringPlaneY, const QVector2D& translate, const QPointF& center, 

        const QSizeF& windowSize)

    {

        mIndex = index;

        mQuad = quad;

        QMatrix4x4 tm;

        tm.setToIdentity();

        tm.rotate(quad->outerRotation());

        if (mQuad->mirrorImageEnabled())

        {

            computeMirroredPoints(tm, projView, mirroringPlaneY, translate, center, windowSize);

        }

        tm.translate(quad->position());    

        tm.rotate(quad->rotation());    

        tm.scale(quad->scale().x(), quad->scale().y());

        tm = projView * tm;         

        perspectiveTransformPoints(mTransformedPoints, tm, center, windowSize);

        for (int i = 0; i < 4; i++)

            mTransformedPoints[i] += translate;

    }

    void HgTransformedQuad::getTransformedPoints(QPolygonF& poly) const

    {

        poly.clear();

        poly.append(mTransformedPoints[0].toPointF());

        poly.append(mTransformedPoints[1].toPointF());

        poly.append(mTransformedPoints[2].toPointF());

        poly.append(mTransformedPoints[3].toPointF());    

    }

    bool HgTransformedQuad::quadSorter(HgTransformedQuad* a, HgTransformedQuad* b)

    {

        return a->mQuad->position().z() < b->mQuad->position().z();

    }

    HgQuad* HgTransformedQuad::quad() const

    {

        return mQuad;

    }

    void HgTransformedQuad::computeMirroredPoints(const QMatrix4x4& trans, const QMatrix4x4& projView, 

        qreal mirroringPlaneY, const QVector2D& translate, const QPointF& center, 

        const QSizeF& windowSize)

    {

        HgQuad* quad = mQuad;

        QMatrix4x4 mirror = trans;

        qreal distToPlane = qAbs(quad->position().y() - mirroringPlaneY);

        mirror.rotate(quad->rotation());

        QMatrix4x4 modelViewProjMatrix = projView * mirror;

        perspectiveTransformPoints(mMirroredPoints, modelViewProjMatrix, center, windowSize);    

        for (int i = 0; i < 4; i++)

            mMirroredPoints[i] += translate;

    }

    void HgTransformedQuad::perspectiveTransformPoints(QVector2D* outPoints, const QMatrix4x4& matrix, 

        const QPointF& center, const QSizeF& windowSize)

    {

        const QVector4D points[] = 

        {

            QVector4D(-0.5f, -0.5f, 0.0f, 1.0f),

            QVector4D( 0.5f, -0.5f, 0.0f, 1.0f),

            QVector4D( 0.5f,  0.5f, 0.0f, 1.0f),

            QVector4D(-0.5f,  0.5f, 0.0f, 1.0f)

        };

        qreal hw = windowSize.width() * 0.5f;

        qreal hh = windowSize.height() * 0.5f;

        for (int i = 0; i < 4; i++)

        {

            QVector4D temp = matrix * points[i];

            outPoints[i] = QVector2D(

                center.x() + temp.x() / temp.w() * hw, 

                center.y() + (temp.y() / temp.w() * hh) * mYDir);

        }

    }