/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

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 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include <svx/e3dsceneupdater.hxx>

#include <drawinglayer/geometry/viewinformation3d.hxx>

#include <svx/obj3d.hxx>

#include <svx/scene3d.hxx>

#include <svx/sdr/contact/viewcontactofe3dscene.hxx>

E3DModifySceneSnapRectUpdater::E3DModifySceneSnapRectUpdater(const SdrObject* pObject)

:   mpScene(nullptr)

{

    // Secure old 3D transformation stack before modification

    const E3dObject* pE3dObject = DynCastE3dObject(pObject);

    if(!pE3dObject)

        return;

    mpScene = pE3dObject->getRootE3dSceneFromE3dObject();

    if(nullptr == mpScene || mpScene->getRootE3dSceneFromE3dObject() != mpScene)

        return;

    // if there is a scene and it's the outmost scene, get current 3D range

    const sdr::contact::ViewContactOfE3dScene& rVCScene = static_cast< sdr::contact::ViewContactOfE3dScene& >(mpScene->GetViewContact());

    const basegfx::B3DRange aAllContentRange(rVCScene.getAllContentRange3D());

    if(aAllContentRange.isEmpty())

    {

        // no content, nothing to do

        mpScene = nullptr;

    }

    else

    {

        // secure current 3D transformation stack

        mpViewInformation3D = rVCScene.getViewInformation3D(aAllContentRange);

    }

}

E3DModifySceneSnapRectUpdater::~E3DModifySceneSnapRectUpdater()

{

    if(!(mpScene && mpViewInformation3D))

        return;

    // after changing parts of the scene, use the secured last 3d transformation stack and the new content

    // range to calculate a new, eventually expanded or shrunk, 2D geometry for the scene and apply it.

    // Get new content range

    const sdr::contact::ViewContactOfE3dScene& rVCScene = static_cast< sdr::contact::ViewContactOfE3dScene& >(mpScene->GetViewContact());

    basegfx::B3DRange aAllContentRange(rVCScene.getAllContentRange3D());

    // only change when there is still content; else let scene stay at old SnapRect

    if(aAllContentRange.isEmpty())

        return;

    // check if object transform of scene has changed

    if(mpViewInformation3D->getObjectTransformation() != mpScene->GetTransform())

    {

        // If Yes, it needs to be updated since it's - for historical reasons -

        // part of the basic 3d transformation stack of the scene

        mpViewInformation3D = drawinglayer::geometry::ViewInformation3D(

            mpScene->GetTransform(), // replace object transformation with new local transform

            mpViewInformation3D->getOrientation(),

            mpViewInformation3D->getProjection(),

            mpViewInformation3D->getDeviceToView(),

            mpViewInformation3D->getViewTime(),

            mpViewInformation3D->getExtendedInformationSequence());

    }

    // transform content range to scene-relative coordinates using old 3d transformation stack

    aAllContentRange.transform(mpViewInformation3D->getObjectToView());

    // build 2d relative content range

    basegfx::B2DRange aSnapRange(

        aAllContentRange.getMinX(), aAllContentRange.getMinY(),

        aAllContentRange.getMaxX(), aAllContentRange.getMaxY());

    // transform to 2D world coordinates using scene's 2D transformation

    aSnapRange.transform(rVCScene.getObjectTransformation());

    // snap to (old) integer

    const tools::Rectangle aNewSnapRect(

        sal_Int32(floor(aSnapRange.getMinX())), sal_Int32(floor(aSnapRange.getMinY())),

        sal_Int32(ceil(aSnapRange.getMaxX())), sal_Int32(ceil(aSnapRange.getMaxY())));

    // set as new SnapRect and invalidate bound volume

    if(mpScene->GetSnapRect() != aNewSnapRect)

    {

        mpScene->SetSnapRect(aNewSnapRect);

        mpScene->InvalidateBoundVolume();

    }

}

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