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

#pragma once

#include <drawinglayer/drawinglayerdllapi.h>

#include <drawinglayer/primitive2d/BufferedDecompositionPrimitive2D.hxx>
#include <drawinglayer/primitive3d/baseprimitive3d.hxx>
#include <drawinglayer/geometry/viewinformation3d.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <vcl/bitmap.hxx>
#include <drawinglayer/attribute/sdrsceneattribute3d.hxx>
#include <drawinglayer/attribute/sdrlightingattribute3d.hxx>

namespace drawinglayer::primitive2d
{
        /** ScenePrimitive2D class

            This primitive defines a 3D scene as a 2D primitive and is the anchor point
            for a 3D visualisation. The decomposition is view-dependent and will try to
            re-use already rendered 3D content.

            The rendering is done using the default-3D renderer from basegfx which supports
            AntiAliasing.

            The 2D primitive's geometric range is defined completely by the
            ObjectTransformation combined with evtl. 2D shadows from the 3D objects. The
            shadows of 3D objects are 2D polygons, projected with the 3D transformation.

            This is the class a renderer may process directly when he wants to implement
            an own (e.g. system-specific) 3D renderer.
         */
        class DRAWINGLAYER_DLLPUBLIC ScenePrimitive2D final : public BufferedDecompositionPrimitive2D
        {
        private:
            /// the 3D geometry definition
            primitive3d::Primitive3DContainer                    mxChildren3D;

            /// 3D scene attribute set
            attribute::SdrSceneAttribute                        maSdrSceneAttribute;

            /// lighting attribute set
            attribute::SdrLightingAttribute                     maSdrLightingAttribute;

            /// object transformation for scene for 2D definition
            basegfx::B2DHomMatrix                               maObjectTransformation;

            /// scene transformation set and object transformation
            geometry::ViewInformation3D                         maViewInformation3D;

            /// the primitiveSequence for on-demand created shadow primitives (see mbShadow3DChecked)
            Primitive2DContainer                                   maShadowPrimitives;

            /** flag if given 3D geometry is already checked for shadow definitions and 2d shadows
                are created in maShadowPrimitives
             */
            bool                                                mbShadow3DChecked : 1;

            /// the last used NewDiscreteSize and NewUnitVisiblePart definitions for decomposition
            double                                              mfOldDiscreteSizeX;
            double                                              mfOldDiscreteSizeY;
            basegfx::B2DRange                                   maOldUnitVisiblePart;

            /** the last created Bitmap, e.g. for fast HitTest. This does not really need
                memory since Bitmap is internally RefCounted
             */
            Bitmap                                              maOldRenderedBitmap;

            /// private helpers
            bool impGetShadow3D() const;
            void calculateDiscreteSizes(
                const geometry::ViewInformation2D& rViewInformation,
                basegfx::B2DRange& rDiscreteRange,
                basegfx::B2DRange& rVisibleDiscreteRange,
                basegfx::B2DRange& rUnitVisibleRange) const;

            /// local decomposition.
            virtual Primitive2DReference create2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const override;

        public:
            /// public helpers
            /** Geometry extractor. Shadow will be added as in create2DDecomposition, but
                the 3D content is not converted to a bitmap visualisation but to projected 2D geometry. This
                helper is useful e.g. for Contour extraction or HitTests.
              */
            Primitive2DContainer getGeometry2D() const;
            Primitive2DContainer getShadow2D() const;

            /** Fast HitTest which uses the last buffered Bitmap from the last
                rendered area if available. The return value describes if the check
                could be done with the current information, so do NOT use o_rResult
                when it returns false. o_rResult will be changed on return true and
                then contains a definitive answer if content of this scene is hit or
                not. On return false, it is normally necessary to use the geometric
                HitTest (see CutFindProcessor usages). The given HitPoint
                has to be in logic coordinates in scene's ObjectCoordinateSystem.
             */
            bool tryToCheckLastVisualisationDirectHit(const basegfx::B2DPoint& rLogicHitPoint, bool& o_rResult) const;

            /// constructor
            ScenePrimitive2D(
                primitive3d::Primitive3DContainer xChildren3D,
                attribute::SdrSceneAttribute aSdrSceneAttribute,
                attribute::SdrLightingAttribute aSdrLightingAttribute,
                basegfx::B2DHomMatrix aObjectTransformation,
                geometry::ViewInformation3D aViewInformation3D);

            /// data read access
            const primitive3d::Primitive3DContainer& getChildren3D() const { return mxChildren3D; }
            const attribute::SdrSceneAttribute& getSdrSceneAttribute() const { return maSdrSceneAttribute; }
            const attribute::SdrLightingAttribute& getSdrLightingAttribute() const { return maSdrLightingAttribute; }
            const basegfx::B2DHomMatrix& getObjectTransformation() const { return maObjectTransformation; }
            const geometry::ViewInformation3D& getViewInformation3D() const { return maViewInformation3D; }

            /// compare operator
            virtual bool operator==(const BasePrimitive2D& rPrimitive) const override;

            /// get range
            virtual basegfx::B2DRange getB2DRange(const geometry::ViewInformation2D& rViewInformation) const override;

            /// provide unique ID
            virtual sal_uInt32 getPrimitive2DID() const override;

            /// get local decomposition. Override since this decomposition is view-dependent
            virtual void get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor, const geometry::ViewInformation2D& rViewInformation) const override;
        };
} // end of namespace drawinglayer::primitive2d


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