xref: /aoo4110/main/basegfx/inc/basegfx/polygon/b3dpolygontools.hxx (revision b1cdbd2c)

/**************************************************************
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/



#ifndef _BGFX_POLYGON_B3DPOLYGONTOOLS_HXX
#define _BGFX_POLYGON_B3DPOLYGONTOOLS_HXX

#include <basegfx/point/b3dpoint.hxx>
#include <basegfx/vector/b3dvector.hxx>
#include <basegfx/polygon/b3dpolypolygon.hxx>
#include <basegfx/vector/b2enums.hxx>
#include <vector>

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

namespace basegfx
{
	// predefinitions
	class B3DPolygon;
	class B3DRange;

	namespace tools
	{
		// B3DPolygon tools

		/**	Check if given polygon is closed. This is kind of a
			'classic' method to support old polygon definitions.
			Those old polygon definitions define the closed state
			of the polygon using identical start and endpoints. This
			method corrects this (removes double start/end points)
			and sets the Closed()-state of the polygon correctly.
		*/
		void checkClosed(B3DPolygon& rCandidate);

		// Get successor and predecessor indices. Returning the same index means there
		// is none. Same for successor.
		sal_uInt32 getIndexOfPredecessor(sal_uInt32 nIndex, const B3DPolygon& rCandidate);
		sal_uInt32 getIndexOfSuccessor(sal_uInt32 nIndex, const B3DPolygon& rCandidate);

		// Get orientation of Polygon
		B2VectorOrientation getOrientation(const B3DPolygon& rCandidate);

		// get size of polygon. Control vectors are included in that ranges.
		B3DRange getRange(const B3DPolygon& rCandidate);

		// get normal vector of polygon
		B3DVector getNormal(const B3DPolygon& rCandidate);

		// get normal vector of positive oriented polygon
		B3DVector getPositiveOrientedNormal(const B3DPolygon& rCandidate);

		// get signed area of polygon
		double getSignedArea(const B3DPolygon& rCandidate);

		// get area of polygon
		double getArea(const B3DPolygon& rCandidate);

		// get signed area of polygon
		double getSignedArea(const B3DPolygon& rCandidate);

		// get area of polygon
		double getArea(const ::basegfx::B3DPolygon& rCandidate);

		// get length of polygon edge from point nIndex to nIndex + 1
		double getEdgeLength(const B3DPolygon& rCandidate, sal_uInt32 nIndex);

		// get length of polygon
		double getLength(const B3DPolygon& rCandidate);

		// get position on polygon for absolute given distance. If
		// length is given, it is assumed the correct polygon length, if 0.0 it is calculated
		// using getLength(...)
		B3DPoint getPositionAbsolute(const B3DPolygon& rCandidate, double fDistance, double fLength = 0.0);

		// get position on polygon for relative given distance in range [0.0 .. 1.0]. If
		// length is given, it is assumed the correct polygon length, if 0.0 it is calculated
		// using getLength(...)
		B3DPoint getPositionRelative(const B3DPolygon& rCandidate, double fDistance, double fLength = 0.0);

		/** Apply given LineDashing to given polygon

			For a description see applyLineDashing in b2dpolygontoos.hxx
		*/
		void applyLineDashing(
			const B3DPolygon& rCandidate,
			const ::std::vector<double>& rDotDashArray,
			B3DPolyPolygon* pLineTarget,
            B3DPolyPolygon* pGapTarget = 0,
			double fFullDashDotLen = 0.0);

		/** Create/replace normals for given 3d geometry with default normals from given center to outside.
			rCandidate:	the 3d geometry to change
			rCenter:	the center of the 3d geometry
         */
		B3DPolygon applyDefaultNormalsSphere( const B3DPolygon& rCandidate, const B3DPoint& rCenter);

		/** invert normals for given 3d geometry.
         */
		B3DPolygon invertNormals( const B3DPolygon& rCandidate);

		/** Create/replace texture coordinates for given 3d geometry with parallel projected one
			rRange: the full range of the 3d geometry
			If bChangeX, x texture coordinate will be recalculated.
			If bChangeY, y texture coordinate will be recalculated.
         */
		B3DPolygon applyDefaultTextureCoordinatesParallel( const B3DPolygon& rCandidate, const B3DRange& rRange, bool bChangeX = true, bool bChangeY = true);

		/** Create/replace texture coordinates for given 3d geometry with spherical one
			rCenter: the centre of the used 3d geometry
			If bChangeX, x texture coordinate will be recalculated.
			If bChangeY, y texture coordinate will be recalculated.
         */
		B3DPolygon applyDefaultTextureCoordinatesSphere( const B3DPolygon& rCandidate, const B3DPoint& rCenter, bool bChangeX = true, bool bChangeY = true);

		// test if point is inside epsilon-range around an edge defined
		// by the two given points. Can be used for HitTesting. The epsilon-range
		// is defined to be the cylinder centered to the given edge, using radius
		// fDistance, and the sphere around both points with radius fDistance.
		bool isInEpsilonRange(const B3DPoint& rEdgeStart, const B3DPoint& rEdgeEnd, const B3DPoint& rTestPosition, double fDistance);

		// test if point is inside epsilon-range around the given Polygon. Can be used
		// for HitTesting. The epsilon-range is defined to be the cylinder centered to
        // the given edge, using radius fDistance, and the sphere around both points with radius fDistance.
		bool isInEpsilonRange(const B3DPolygon& rCandidate, const B3DPoint& rTestPosition, double fDistance);

		// isInside tests for B3DPoint and other B3DPolygon. On border is not inside as long as
		// not true is given in bWithBorder flag.
		bool isInside(const B3DPolygon& rCandidate, const B3DPoint& rPoint, bool bWithBorder = false);
		bool isInside(const B3DPolygon& rCandidate, const B3DPolygon& rPolygon, bool bWithBorder = false);

		// calculates if given point is on given line, taking care of the numerical epsilon
		bool isPointOnLine(const B3DPoint& rStart, const B3DPoint& rEnd, const B3DPoint& rCandidate, bool bWithPoints = false);

        // calculates if given point is on given polygon, taking care of the numerical epsilon. Uses
		// isPointOnLine internally
		bool isPointOnPolygon(const B3DPolygon& rCandidate, const B3DPoint& rPoint, bool bWithPoints = true);

        // helper to get a fCut position between a plane (given with normal and a point)
        // and a line given by start and end point
        bool getCutBetweenLineAndPlane(const B3DVector& rPlaneNormal, const B3DPoint& rPlanePoint, const B3DPoint& rEdgeStart, const B3DPoint& rEdgeEnd, double& fCut);

        // helper to get a fCut position between a 3d Polygon
        // and a line given by start and end point
        bool getCutBetweenLineAndPolygon(const B3DPolygon& rCandidate, const B3DPoint& rEdgeStart, const B3DPoint& rEdgeEnd, double& fCut);

		//////////////////////////////////////////////////////////////////////
		// comparators with tolerance for 3D Polygons
		bool equal(const B3DPolygon& rCandidateA, const B3DPolygon& rCandidateB, const double& rfSmallValue);
		bool equal(const B3DPolygon& rCandidateA, const B3DPolygon& rCandidateB);

		/** snap some polygon coordinates to discrete coordinates

			This method allows to snap some polygon points to discrete (integer) values
			which equals e.g. a snap to discrete coordinates. It will snap points of
			horizontal and vertical edges

			@param rCandidate
			The source polygon

			@return
			The modified version of the source polygon
		*/
		B3DPolygon snapPointsOfHorizontalOrVerticalEdges(const B3DPolygon& rCandidate);

	} // end of namespace tools
} // end of namespace basegfx

#endif /* _BGFX_POLYGON_B3DPOLYGONTOOLS_HXX */