path: root/include/basegfx/polygon/b2dpolypolygontools.hxx

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#ifndef _BGFX_POLYPOLYGON_B2DPOLYGONTOOLS_HXX
#define _BGFX_POLYPOLYGON_B2DPOLYGONTOOLS_HXX

#include <basegfx/point/b2dpoint.hxx>
#include <basegfx/vector/b2dvector.hxx>
#include <basegfx/polygon/b2dpolygon.hxx>
#include <basegfx/polygon/b3dpolypolygon.hxx>
#include <vector>
#include <basegfx/basegfxdllapi.h>


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

namespace basegfx
{
    // predefinitions
    class B2DPolyPolygon;
    class B2DRange;

    namespace tools
    {
        // B2DPolyPolygon tools

        // Check and evtl. correct orientations of all contained Polygons so that
        // the orientations of contained polygons will variate to express areas and
        // holes
        BASEGFX_DLLPUBLIC B2DPolyPolygon correctOrientations(const B2DPolyPolygon& rCandidate);

        // make sure polygon with index 0L is not a hole. This may evtl. change the
        // sequence of polygons, but allows to use polygon with index 0L to
        // get the correct normal for the whole polyPolygon
        BASEGFX_DLLPUBLIC B2DPolyPolygon correctOutmostPolygon(const B2DPolyPolygon& rCandidate);

        // Subdivide all contained curves. Use distanceBound value if given.
        BASEGFX_DLLPUBLIC B2DPolyPolygon adaptiveSubdivideByDistance(const B2DPolyPolygon& rCandidate, double fDistanceBound = 0.0);

        // Subdivide all contained curves. Use distanceBound value if given. Else, a convenient one
        // is created.
        BASEGFX_DLLPUBLIC B2DPolyPolygon adaptiveSubdivideByAngle(const B2DPolyPolygon& rCandidate, double fAngleBound = 0.0);

        // Subdivide all contained curves. Use nCount divisions if given. Else, a convenient one
        // is created.
        BASEGFX_DLLPUBLIC B2DPolyPolygon adaptiveSubdivideByCount(const B2DPolyPolygon& rCandidate, sal_uInt32 nCount = 0L);

        // isInside test for B2dPoint. On border is not inside as long as not true is given
        // in bWithBorder flag. It is assumed that the orientations of the given polygon are correct.
        BASEGFX_DLLPUBLIC bool isInside(const B2DPolyPolygon& rCandidate, const B2DPoint& rPoint, bool bWithBorder = false);

        /** Get the range of a polyPolygon

            For detailed description look at getRange(const B2DPolygon&).
            This method just expands by the range of every sub-Polygon.

            @param rCandidate
            The B2DPolyPolygon eventually containing bezier segments

            @return
            The outer range of the polygon
        */
        BASEGFX_DLLPUBLIC B2DRange getRange(const B2DPolyPolygon& rCandidate);

        // get signed area of polygon
        BASEGFX_DLLPUBLIC double getSignedArea(const B2DPolyPolygon& rCandidate);

        // get area of polygon
        BASEGFX_DLLPUBLIC double getArea(const B2DPolyPolygon& rCandidate);

        /** Apply given LineDashing to given polyPolygon

            For a description see applyLineDashing in b2dpolygontoos.hxx
        */
        BASEGFX_DLLPUBLIC void applyLineDashing(
            const B2DPolyPolygon& rCandidate,
            const ::std::vector<double>& rDotDashArray,
            B2DPolyPolygon* pLineTarget,
            B2DPolyPolygon* pGapTarget = 0,
            double fFullDashDotLen = 0.0);

        // test if point is inside epsilon-range around the given PolyPolygon. Can be used
        // for HitTesting. The epsilon-range is defined to be the tube around the PolyPolygon
        // with distance fDistance and rounded edges (start and end point).
        BASEGFX_DLLPUBLIC bool isInEpsilonRange(const B2DPolyPolygon& rCandidate, const B2DPoint& rTestPosition, double fDistance);

        /** Read poly-polygon from SVG.

            This function imports a poly-polygon from an SVG-D
            attribute.

            @param o_rPolyPoly
            The output poly-polygon

            @param rSvgDAttribute
            A valid SVG-D attribute string

            @param rWrongPositionAfterZ
            Indicates wheter the generator interprets wrongly
            the position in the path after Z or z elements
            https://bugs.freedesktop.org/show_bug.cgi?id=47406

            @return true, if the string was successfully parsed
         */
        BASEGFX_DLLPUBLIC bool importFromSvgD( B2DPolyPolygon&        o_rPolyPoly,
                             const OUString& rSvgDAttribute, bool bWrongPositionAfterZ = false );

        /** Read poly-polygon from SVG.

            This function imports a poly-polygon from an SVG points
            attribute (a plain list of coordinate pairs).

            @param o_rPoly
            The output polygon. Note that svg:points can only define a
            single polygon

            @param rSvgPointsAttribute
            A valid SVG points attribute string

            @return true, if the string was successfully parsed
         */
        BASEGFX_DLLPUBLIC bool importFromSvgPoints( B2DPolygon&            o_rPoly,
                                  const OUString& rSvgPointsAttribute );


        // grow for polyPolygon. Move all geometry in each point in the direction of the normal in that point
        // with the given amount. Value may be negative.
        BASEGFX_DLLPUBLIC B2DPolyPolygon growInNormalDirection(const B2DPolyPolygon& rCandidate, double fValue);

        // This method will correct a pair of polyPolygons where the goal is to keep same point count
        // to allow direct point association and also to remove self-intersections produced by shrinks.
        // This method will eventually change both polyPolygons to reach that goal because there are cases
        // where it is necessary to add new cut points to the original
        BASEGFX_DLLPUBLIC void correctGrowShrinkPolygonPair(B2DPolyPolygon& rOriginal, B2DPolyPolygon& rGrown);

        // force all sub-polygons to a point count of nSegments
        BASEGFX_DLLPUBLIC B2DPolyPolygon reSegmentPolyPolygon(const B2DPolyPolygon& rCandidate, sal_uInt32 nSegments);

        // create polygon state at t from 0.0 to 1.0 between the two polygons. Both polygons must have the same
        // organisation, e.g. same amount of polygons
        BASEGFX_DLLPUBLIC B2DPolyPolygon interpolate(const B2DPolyPolygon& rOld1, const B2DPolyPolygon& rOld2, double t);

        // create 3d PolyPolygon from given 2d PolyPolygon. The given fZCoordinate is used to expand the
        // third coordinate.
        BASEGFX_DLLPUBLIC B3DPolyPolygon createB3DPolyPolygonFromB2DPolyPolygon(const B2DPolyPolygon& rCandidate, double fZCoordinate = 0.0);

        // create 2d PolyPolygon from given 3d PolyPolygon. All coordinates are transformed using the given
        // matrix and the resulting x,y is used to form the new polygon.
        BASEGFX_DLLPUBLIC B2DPolyPolygon createB2DPolyPolygonFromB3DPolyPolygon(const B3DPolyPolygon& rCandidate, const B3DHomMatrix& rMat);

        // for each contained edge in each contained polygon calculate the smallest distance. Return the index to the smallest
        // edge in rEdgeIndex and the index to the polygon in rPolygonIndex. The relative position on the edge is returned in rCut.
        // If nothing was found (e.g. empty input plygon), DBL_MAX is returned.
        BASEGFX_DLLPUBLIC double getSmallestDistancePointToPolyPolygon(const B2DPolyPolygon& rCandidate, const B2DPoint& rTestPoint, sal_uInt32& rPolygonIndex, sal_uInt32& rEdgeIndex, double& rCut);

        // distort PolyPolygon. rOriginal describes the original range, where the given points describe the distorted
        // corresponding points.
        BASEGFX_DLLPUBLIC B2DPolyPolygon distort(const B2DPolyPolygon& rCandidate, const B2DRange& rOriginal, const B2DPoint& rTopLeft, const B2DPoint& rTopRight, const B2DPoint& rBottomLeft, const B2DPoint& rBottomRight);

        // expand all segments (which are not yet) to curve segments. This is done with setting the control
        // vectors on the 1/3 resp. 2/3 distances on each segment.
        BASEGFX_DLLPUBLIC B2DPolyPolygon expandToCurve(const B2DPolyPolygon& rCandidate);

        /** Predicate whether a given poly-polygon is a rectangle.

            @param rPoly
            PolyPolygon to check

            @return true, if the poly-polygon describes a rectangle
            (contains exactly one polygon, polygon is closed, and the
            points are either cw or ccw enumerations of a rectangle's
            vertices). Note that intermediate points and duplicate
            points are ignored.
         */
        BASEGFX_DLLPUBLIC bool isRectangle( const B2DPolyPolygon& rPoly );

        /** Export poly-polygon to SVG.

            This function exports a poly-polygon into an SVG-D
            statement. Currently, output of relative point sequences
            is not yet supported (might cause slightly larger output)

            @param rPolyPoly
            The poly-polygon to export

            @param bUseRelativeCoordinates
            When true, all coordinate values are exported as relative
            to the current position. This tends to save some space,
            since fewer digits needs to be written.

            @param bDetectQuadraticBeziers
            When true, the export tries to detect cubic bezier
            segments in the input polygon, which can be represented by
            quadratic bezier segments. Note that the generated string
            causes versions prior to OOo2.0 to crash.

            @return the generated SVG-D statement (the XML d attribute
            value alone, without any "<path ...>" or "d="...")
         */
        BASEGFX_DLLPUBLIC OUString exportToSvgD( const B2DPolyPolygon& rPolyPoly,
                                      bool                  bUseRelativeCoordinates=true,
                                      bool                  bDetectQuadraticBeziers=true );

        // #i76891# Try to remove existing curve segments if they are simply edges
        BASEGFX_DLLPUBLIC B2DPolyPolygon simplifyCurveSegments(const B2DPolyPolygon& rCandidate);

        /** Creates polypolygon for seven-segment display number

            This function takes an integer number between 0 and 9 and
            convert it into the well-known seven-segment display
            number (like most digital clocks show their numbers). The
            digit will exactly fit the unit rectangle. The polypolygon
            will be a line polygon, i.e. if you need the segment parts
            to have width, use createAreaGeometry() on the result.

            @param cNumber
            Number from '0' to '9' as ASCII char, or '-', 'E' and '.'
            to convert to 7 segment code

            @param bLitSegments
            When true, return a polygon containing the segments that
            are 'lit' for the given number. Return un-lit segments
            otherwise.
         */
        B2DPolyPolygon createSevenSegmentPolyPolygon(sal_Char cNumber, bool bLitSegments=true);

        /** 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
        */
        BASEGFX_DLLPUBLIC B2DPolyPolygon snapPointsOfHorizontalOrVerticalEdges(const B2DPolyPolygon& rCandidate);

        /** returns true if the Polygon only contains horizontal or vertical edges
            so that it could be represented by RegionBands
        */
        BASEGFX_DLLPUBLIC bool containsOnlyHorizontalAndVerticalEdges(const B2DPolyPolygon& rCandidate);

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

#endif /* _BGFX_POLYPOLYGON_B2DPOLYGONTOOLS_HXX */

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