xref: /AOO41X/main/svx/source/engine3d/helperminimaldepth3d.cxx (revision cdf0e10c4e3984b49a9502b011690b615761d4a3)

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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_svx.hxx"

#include <helperminimaldepth3d.hxx>
#include <drawinglayer/processor3d/baseprocessor3d.hxx>
#include <drawinglayer/primitive3d/drawinglayer_primitivetypes3d.hxx>
#include <drawinglayer/primitive3d/transformprimitive3d.hxx>
#include <drawinglayer/primitive3d/polygonprimitive3d.hxx>
#include <drawinglayer/primitive3d/polypolygonprimitive3d.hxx>
#include <svx/sdr/contact/viewcontactofe3d.hxx>
#include <svx/sdr/contact/viewcontactofe3dscene.hxx>
#include <svx/obj3d.hxx>
#include <svx/scene3d.hxx>

//////////////////////////////////////////////////////////////////////////////

namespace drawinglayer
{
	namespace processor3d
	{
		class MinimalDephInViewExtractor : public BaseProcessor3D
		{
		private:
            // the value which will be fetched as result
            double                                  mfMinimalDepth;

			// as tooling, the process() implementation takes over API handling and calls this
			// virtual render method when the primitive implementation is BasePrimitive3D-based.
			virtual void processBasePrimitive3D(const primitive3d::BasePrimitive3D& rCandidate);

		public:
			MinimalDephInViewExtractor(const geometry::ViewInformation3D& rViewInformation)
            :   BaseProcessor3D(rViewInformation),
                mfMinimalDepth(DBL_MAX)
            {}

			// data access
            double getMinimalDepth() const { return mfMinimalDepth; }
		};

        void MinimalDephInViewExtractor::processBasePrimitive3D(const primitive3d::BasePrimitive3D& rCandidate)
        {
			// it is a BasePrimitive3D implementation, use getPrimitive3DID() call for switch
			switch(rCandidate.getPrimitive3DID())
			{
				case PRIMITIVE3D_ID_TRANSFORMPRIMITIVE3D :
				{
					// transform group. Remember current transformations
					const primitive3d::TransformPrimitive3D& rPrimitive = static_cast< const primitive3d::TransformPrimitive3D& >(rCandidate);
					const geometry::ViewInformation3D aLastViewInformation3D(getViewInformation3D());

					// create new transformation; add new object transform from right side
					const geometry::ViewInformation3D aNewViewInformation3D(
						aLastViewInformation3D.getObjectTransformation() * rPrimitive.getTransformation(),
						aLastViewInformation3D.getOrientation(),
						aLastViewInformation3D.getProjection(),
						aLastViewInformation3D.getDeviceToView(),
						aLastViewInformation3D.getViewTime(),
						aLastViewInformation3D.getExtendedInformationSequence());
					updateViewInformation(aNewViewInformation3D);

					// let break down
					process(rPrimitive.getChildren());

					// restore transformations
					updateViewInformation(aLastViewInformation3D);
					break;
				}
				case PRIMITIVE3D_ID_POLYGONHAIRLINEPRIMITIVE3D :
				{
					// PolygonHairlinePrimitive3D
					const primitive3d::PolygonHairlinePrimitive3D& rPrimitive = static_cast< const primitive3d::PolygonHairlinePrimitive3D& >(rCandidate);
           			const basegfx::B3DPolygon& rPolygon = rPrimitive.getB3DPolygon();
                    const sal_uInt32 nCount(rPolygon.count());

                    for(sal_uInt32 a(0); a < nCount; a++)
                    {
                        const basegfx::B3DPoint aPointInView(getViewInformation3D().getObjectToView() * rPolygon.getB3DPoint(a));

                        if(aPointInView.getZ() < mfMinimalDepth)
                        {
                            mfMinimalDepth = aPointInView.getZ();
                        }
                    }

                    break;
				}
				case PRIMITIVE3D_ID_POLYPOLYGONMATERIALPRIMITIVE3D :
				{
					// PolyPolygonMaterialPrimitive3D
					const primitive3d::PolyPolygonMaterialPrimitive3D& rPrimitive = static_cast< const primitive3d::PolyPolygonMaterialPrimitive3D& >(rCandidate);
           			const basegfx::B3DPolyPolygon& rPolyPolygon = rPrimitive.getB3DPolyPolygon();
                    const sal_uInt32 nPolyCount(rPolyPolygon.count());

                    for(sal_uInt32 a(0); a < nPolyCount; a++)
                    {
           			    const basegfx::B3DPolygon aPolygon(rPolyPolygon.getB3DPolygon(a));
                        const sal_uInt32 nCount(aPolygon.count());

                        for(sal_uInt32 b(0); b < nCount; b++)
                        {
                            const basegfx::B3DPoint aPointInView(getViewInformation3D().getObjectToView() * aPolygon.getB3DPoint(b));

                            if(aPointInView.getZ() < mfMinimalDepth)
                            {
                                mfMinimalDepth = aPointInView.getZ();
                            }
                        }
                    }

                    break;
				}
				default :
				{
					// process recursively
					process(rCandidate.get3DDecomposition(getViewInformation3D()));
					break;
				}
            }
        }
	} // end of namespace processor3d
} // end of namespace drawinglayer

//////////////////////////////////////////////////////////////////////////////
// changed to create values using VCs, Primitive3DSequence and ViewInformation3D to allow
// removal of old 3D bucket geometry. There is one slight difference in the result, it's
// in [0.0 .. 1.0] for Z-Depth since the scaling of the scene as 2D object is no longer
// part of the 3D transformations. This could be added since the ViewContactOfE3dScene is
// given, but is not needed since the permutation of the depth values needs only be correct
// relative to each other

double getMinimalDepthInViewCoordinates(const E3dCompoundObject& rObject)
{
    // this is a E3dCompoundObject, so it cannot be a scene (which is a E3dObject).
    // Get primitive sequence using VC
    const sdr::contact::ViewContactOfE3d& rVCObject = static_cast< sdr::contact::ViewContactOfE3d& >(rObject.GetViewContact());
	const drawinglayer::primitive3d::Primitive3DSequence aPrimitives = rVCObject.getViewIndependentPrimitive3DSequence();
    double fRetval(DBL_MAX);

    if(aPrimitives.hasElements())
    {
        const E3dScene* pScene = rObject.GetScene();

        if(pScene)
        {
            // get ViewInformation3D from scene using VC
            const sdr::contact::ViewContactOfE3dScene& rVCScene = static_cast< sdr::contact::ViewContactOfE3dScene& >(pScene->GetViewContact());
	        const drawinglayer::geometry::ViewInformation3D aViewInfo3D(rVCScene.getViewInformation3D());

            // the scene's object transformation is already part of aViewInfo3D.getObjectTransformation()
            // for historical reasons (see ViewContactOfE3dScene::createViewInformation3D for more info)
            // and the object's transform is part of aPrimitives (and taken into account when decomposing
            // to PolygonHairlinePrimitive3D and PolyPolygonMaterialPrimitive3D). The missing part may be
            // some Scene SdrObjects lying in-between which may need to be added. This is e.g. used in chart,
            // and generally allowed in 3d scenes an their 3d object hierarchy
            basegfx::B3DHomMatrix aInBetweenSceneMatrix;
            E3dScene* pParentScene = dynamic_cast< E3dScene* >(rObject.GetParentObj());

            while(pParentScene && pParentScene != pScene)
            {
                aInBetweenSceneMatrix = pParentScene->GetTransform() * aInBetweenSceneMatrix;
                pParentScene = dynamic_cast< E3dScene* >(pParentScene->GetParentObj());
            }

            // build new ViewInformation containing all transforms
            const drawinglayer::geometry::ViewInformation3D aNewViewInformation3D(
                aViewInfo3D.getObjectTransformation() * aInBetweenSceneMatrix,
                aViewInfo3D.getOrientation(),
                aViewInfo3D.getProjection(),
                aViewInfo3D.getDeviceToView(),
                aViewInfo3D.getViewTime(),
                aViewInfo3D.getExtendedInformationSequence());

            // create extractor helper, proccess geometry and get return value
            drawinglayer::processor3d::MinimalDephInViewExtractor aExtractor(aNewViewInformation3D);
            aExtractor.process(aPrimitives);
            fRetval = aExtractor.getMinimalDepth();
        }
    }

	return fRetval;
}

//////////////////////////////////////////////////////////////////////////////
// eof