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 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_drawinglayer.hxx"

#include <drawinglayer/primitive2d/helplineprimitive2d.hxx>
#include <basegfx/polygon/b2dpolygon.hxx>
#include <drawinglayer/primitive2d/polygonprimitive2d.hxx>
#include <basegfx/polygon/b2dpolygonclipper.hxx>
#include <basegfx/tools/canvastools.hxx>
#include <drawinglayer/geometry/viewinformation2d.hxx>
#include <drawinglayer/primitive2d/drawinglayer_primitivetypes2d.hxx>

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

using namespace com::sun::star;

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

namespace drawinglayer
{
	namespace primitive2d
	{
		Primitive2DSequence HelplinePrimitive2D::create2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const
		{
			std::vector< BasePrimitive2D* > aTempPrimitiveTarget;

			if(!rViewInformation.getViewport().isEmpty() && !getDirection().equalZero())
			{
				// position to view coordinates, DashLen and DashLen in logic
				const basegfx::B2DPoint aViewPosition(rViewInformation.getObjectToViewTransformation() * getPosition());

				switch(getStyle())
				{
					default : // HELPLINESTYLE2D_POINT
					{
						const double fViewFixValue(15.0);
						basegfx::B2DVector aNormalizedDirection(getDirection());
						aNormalizedDirection.normalize();
						aNormalizedDirection *= fViewFixValue;
						const basegfx::B2DPoint aStartA(aViewPosition - aNormalizedDirection);
						const basegfx::B2DPoint aEndA(aViewPosition + aNormalizedDirection);
						basegfx::B2DPolygon aLineA;
						aLineA.append(aStartA);
						aLineA.append(aEndA);
						aLineA.transform(rViewInformation.getInverseObjectToViewTransformation());
						PolygonMarkerPrimitive2D* pNewA = new PolygonMarkerPrimitive2D(aLineA, getRGBColA(), getRGBColB(), getDiscreteDashLength());
						aTempPrimitiveTarget.push_back(pNewA);
						
						const basegfx::B2DVector aPerpendicularNormalizedDirection(basegfx::getPerpendicular(aNormalizedDirection));
						const basegfx::B2DPoint aStartB(aViewPosition - aPerpendicularNormalizedDirection);
						const basegfx::B2DPoint aEndB(aViewPosition + aPerpendicularNormalizedDirection);
						basegfx::B2DPolygon aLineB;
						aLineB.append(aStartB);
						aLineB.append(aEndB);
						aLineB.transform(rViewInformation.getInverseObjectToViewTransformation());
						PolygonMarkerPrimitive2D* pNewB = new PolygonMarkerPrimitive2D(aLineB, getRGBColA(), getRGBColB(), getDiscreteDashLength());
						aTempPrimitiveTarget.push_back(pNewB);

						break;
					}
					case HELPLINESTYLE2D_LINE :
					{
						basegfx::B2DPolygon aLine;

						if(basegfx::areParallel(getDirection(), basegfx::B2DVector(1.0, 0.0)))
						{
							// parallel to X-Axis, get cuts with Y-Axes
							const double fCutA((rViewInformation.getDiscreteViewport().getMinX() - aViewPosition.getX()) / getDirection().getX());
							const double fCutB((rViewInformation.getDiscreteViewport().getMaxX() - aViewPosition.getX()) / getDirection().getX());
							const basegfx::B2DPoint aPosA(aViewPosition + (fCutA * getDirection()));
							const basegfx::B2DPoint aPosB(aViewPosition + (fCutB * getDirection()));
							const bool bBothLeft(aPosA.getX() < rViewInformation.getDiscreteViewport().getMinX() && aPosB.getX() < rViewInformation.getDiscreteViewport().getMinX());
							const bool bBothRight(aPosA.getX() > rViewInformation.getDiscreteViewport().getMaxX() && aPosB.getX() < rViewInformation.getDiscreteViewport().getMaxX());

							if(!bBothLeft && !bBothRight)
							{
								aLine.append(aPosA);
								aLine.append(aPosB);
							}
						}
						else
						{
							// get cuts with X-Axes
							const double fCutA((rViewInformation.getDiscreteViewport().getMinY() - aViewPosition.getY()) / getDirection().getY());
							const double fCutB((rViewInformation.getDiscreteViewport().getMaxY() - aViewPosition.getY()) / getDirection().getY());
							const basegfx::B2DPoint aPosA(aViewPosition + (fCutA * getDirection()));
							const basegfx::B2DPoint aPosB(aViewPosition + (fCutB * getDirection()));
							const bool bBothAbove(aPosA.getY() < rViewInformation.getDiscreteViewport().getMinY() && aPosB.getY() < rViewInformation.getDiscreteViewport().getMinY());
							const bool bBothBelow(aPosA.getY() > rViewInformation.getDiscreteViewport().getMaxY() && aPosB.getY() < rViewInformation.getDiscreteViewport().getMaxY());

							if(!bBothAbove && !bBothBelow)
							{
								aLine.append(aPosA);
								aLine.append(aPosB);
							}
						}

						if(aLine.count())
						{
							// clip against visible area
							const basegfx::B2DPolyPolygon aResult(basegfx::tools::clipPolygonOnRange(aLine, rViewInformation.getDiscreteViewport(), true, true));

							for(sal_uInt32 a(0L); a < aResult.count(); a++)
							{
								basegfx::B2DPolygon aPart(aResult.getB2DPolygon(a));
								aPart.transform(rViewInformation.getInverseObjectToViewTransformation());
								PolygonMarkerPrimitive2D* pNew = new PolygonMarkerPrimitive2D(aPart, getRGBColA(), getRGBColB(), getDiscreteDashLength());
								aTempPrimitiveTarget.push_back(pNew);
							}
						}
						
						break;
					}
				}
			}

			// prepare return value
			Primitive2DSequence aRetval(aTempPrimitiveTarget.size());

			for(sal_uInt32 a(0L); a < aTempPrimitiveTarget.size(); a++)
			{
				const Primitive2DReference xRef(aTempPrimitiveTarget[a]);
				aRetval[a] = xRef;
			}

			return aRetval;
		}

		HelplinePrimitive2D::HelplinePrimitive2D(
			const basegfx::B2DPoint& rPosition, 
			const basegfx::B2DVector& rDirection, 
			HelplineStyle2D eStyle, 
			const basegfx::BColor& rRGBColA, 
			const basegfx::BColor& rRGBColB, 
			double fDiscreteDashLength)
		:	BufferedDecompositionPrimitive2D(),
			maPosition(rPosition),
			maDirection(rDirection),
			meStyle(eStyle),
			maRGBColA(rRGBColA), 
			maRGBColB(rRGBColB),
			mfDiscreteDashLength(fDiscreteDashLength),
			maLastObjectToViewTransformation(),
			maLastViewport()
		{
		}

		bool HelplinePrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const
		{
			if(BufferedDecompositionPrimitive2D::operator==(rPrimitive))
			{
				const HelplinePrimitive2D& rCompare = (HelplinePrimitive2D&)rPrimitive;

				return (getPosition() == rCompare.getPosition()
					&& getDirection() == rCompare.getDirection()
					&& getStyle() == rCompare.getStyle()
					&& getRGBColA() == rCompare.getRGBColA()
					&& getRGBColB() == rCompare.getRGBColB()
					&& getDiscreteDashLength() == rCompare.getDiscreteDashLength());
			}

			return false;
		}

		Primitive2DSequence HelplinePrimitive2D::get2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const
		{ 
			::osl::MutexGuard aGuard( m_aMutex );

			if(getBuffered2DDecomposition().hasElements())
			{
				if(maLastViewport != rViewInformation.getViewport() || maLastObjectToViewTransformation != rViewInformation.getObjectToViewTransformation())
				{
					// conditions of last local decomposition have changed, delete
					const_cast< HelplinePrimitive2D* >(this)->setBuffered2DDecomposition(Primitive2DSequence());
				}
			}

			if(!getBuffered2DDecomposition().hasElements())
			{
				// remember ViewRange and ViewTransformation
				const_cast< HelplinePrimitive2D* >(this)->maLastObjectToViewTransformation = rViewInformation.getObjectToViewTransformation();
				const_cast< HelplinePrimitive2D* >(this)->maLastViewport = rViewInformation.getViewport();
			}

			// use parent implementation
			return BufferedDecompositionPrimitive2D::get2DDecomposition(rViewInformation);
		}

		// provide unique ID
		ImplPrimitrive2DIDBlock(HelplinePrimitive2D, PRIMITIVE2D_ID_HELPLINEPRIMITIVE2D)

	} // end of namespace primitive2d
} // end of namespace drawinglayer

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