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Current view: top level - include/basegfx/curve - b2dcubicbezier.hxx (source / functions) Hit Total Coverage
Test: commit e02a6cb2c3e2b23b203b422e4e0680877f232636 Lines: 0 8 0.0 %
Date: 2014-04-14 Functions: 0 8 0.0 %
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       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #ifndef INCLUDED_BASEGFX_CURVE_B2DCUBICBEZIER_HXX
      21             : #define INCLUDED_BASEGFX_CURVE_B2DCUBICBEZIER_HXX
      22             : 
      23             : #include <basegfx/point/b2dpoint.hxx>
      24             : #include <basegfx/range/b2drange.hxx>
      25             : #include <basegfx/basegfxdllapi.h>
      26             : 
      27             : 
      28             : // predeclarations
      29             : 
      30             : namespace basegfx
      31             : {
      32             :     class B2DPolygon;
      33             : } // end of namespace basegfx
      34             : 
      35             : 
      36             : 
      37             : namespace basegfx
      38             : {
      39             :     class BASEGFX_DLLPUBLIC B2DCubicBezier
      40             :     {
      41             :         B2DPoint                                        maStartPoint;
      42             :         B2DPoint                                        maEndPoint;
      43             :         B2DPoint                                        maControlPointA;
      44             :         B2DPoint                                        maControlPointB;
      45             : 
      46             :     public:
      47             :         B2DCubicBezier();
      48             :         B2DCubicBezier(const B2DCubicBezier& rBezier);
      49             :         B2DCubicBezier(const B2DPoint& rStart, const B2DPoint& rControlPointA, const B2DPoint& rControlPointB, const B2DPoint& rEnd);
      50             :         ~B2DCubicBezier();
      51             : 
      52             :         // assignment operator
      53             :         B2DCubicBezier& operator=(const B2DCubicBezier& rBezier);
      54             : 
      55             :         // compare operators
      56             :         bool operator==(const B2DCubicBezier& rBezier) const;
      57             :         bool operator!=(const B2DCubicBezier& rBezier) const;
      58             :         bool equal(const B2DCubicBezier& rBezier) const;
      59             : 
      60             :         // test if vectors are used
      61             :         bool isBezier() const;
      62             : 
      63             :         // test if contained bezier is trivial and reset vectors accordingly
      64             :         void testAndSolveTrivialBezier();
      65             : 
      66             :         /** get length of edge
      67             : 
      68             :             This method handles beziers and simple edges. For
      69             :             beziers, the deviation describes the maximum allowed
      70             :             deviation from the real edge length. The default
      71             :             allows a deviation of 1% from the correct length.
      72             : 
      73             :             For beziers, there is no direct way to get the length,
      74             :             thus this method may subdivide the bezier edge and may
      75             :             not be cheap.
      76             : 
      77             :             @param fDeviation
      78             :             The maximal allowed deviation between correct length
      79             :             and bezier edge length
      80             : 
      81             :             @return
      82             :             The length of the edge
      83             :         */
      84             :         double getLength(double fDeviation = 0.01) const;
      85             : 
      86             :         // get distance between start and end point
      87             :         double getEdgeLength() const;
      88             : 
      89             :         // get length of control polygon
      90             :         double getControlPolygonLength() const;
      91             : 
      92             :         // data interface
      93           0 :         B2DPoint getStartPoint() const { return maStartPoint; }
      94           0 :         void setStartPoint(const B2DPoint& rValue) { maStartPoint = rValue; }
      95             : 
      96           0 :         B2DPoint getEndPoint() const { return maEndPoint; }
      97           0 :         void setEndPoint(const B2DPoint& rValue) { maEndPoint = rValue; }
      98             : 
      99           0 :         B2DPoint getControlPointA() const { return maControlPointA; }
     100           0 :         void setControlPointA(const B2DPoint& rValue) { maControlPointA = rValue; }
     101             : 
     102           0 :         B2DPoint getControlPointB() const { return maControlPointB; }
     103           0 :         void setControlPointB(const B2DPoint& rValue) { maControlPointB = rValue; }
     104             : 
     105             :         /** get the tangent in point t
     106             : 
     107             :             This method handles all the exceptions, e.g. when control point
     108             :             A is equal to start point and/or control point B is equal to end
     109             :             point
     110             : 
     111             :             @param t
     112             :             The bezier index in the range [0.0 .. 1.0]. It will be truncated.
     113             : 
     114             :             @return
     115             :             The tangent vector in point t
     116             :         */
     117             :         B2DVector getTangent(double t) const;
     118             : 
     119             :         /** adaptive subdivide by angle criteria
     120             :             no start point is added, but all necessary created edges
     121             :             and the end point
     122             :             #i37443# allow the criteria to get unsharp in recursions
     123             :         */
     124             :         void adaptiveSubdivideByAngle(B2DPolygon& rTarget, double fAngleBound, bool bAllowUnsharpen) const;
     125             : 
     126             :         /** #i37443# adaptive subdivide by nCount subdivisions
     127             :             no start point is added, but all necessary created edges
     128             :             and the end point
     129             :         */
     130             :         void adaptiveSubdivideByCount(B2DPolygon& rTarget, sal_uInt32 nCount) const;
     131             : 
     132             :         /** Subdivide cubic bezier segment.
     133             : 
     134             :             This function adaptively subdivides the bezier
     135             :             segment into as much straight line segments as necessary,
     136             :             such that the maximal orthogonal distance from any of the
     137             :             segments to the true curve is less than the given error
     138             :             value.
     139             :             No start point is added, but all necessary created edges
     140             :             and the end point
     141             : 
     142             :             @param rPoly
     143             :             Output polygon. The subdivided bezier segment is added to
     144             :             this polygon via B2DPolygon::append().
     145             : 
     146             :             @param rCurve
     147             :             The cubic bezier curve to subdivide
     148             : 
     149             :             @param fDistanceBound
     150             :             Bound on the maximal distance of the approximation to the
     151             :             true curve.
     152             :         */
     153             :         void adaptiveSubdivideByDistance(B2DPolygon& rTarget, double fDistanceBound) const;
     154             : 
     155             :         // get point at given relative position
     156             :         B2DPoint interpolatePoint(double t) const;
     157             : 
     158             :         // calculate the smallest distance from given point to this cubic bezier segment
     159             :         // and return the value. The relative position on the segment is returned in rCut.
     160             :         double getSmallestDistancePointToBezierSegment(const B2DPoint& rTestPoint, double& rCut) const;
     161             : 
     162             :         // do a split at position t and fill both resulting segments
     163             :         void split(double t, B2DCubicBezier* pBezierA, B2DCubicBezier* pBezierB) const;
     164             : 
     165             :         // extract snippet from fStart to fEnd from this bezier
     166             :         B2DCubicBezier snippet(double fStart, double fEnd) const;
     167             : 
     168             :         // get range including conrol points
     169             :         B2DRange getRange() const;
     170             : 
     171             :         /** Get the minimum extremum position t
     172             : 
     173             :             @param rfResult
     174             :             Will be changed and set to a eventually found split value which should be in the
     175             :             range [0.0 .. 1.0]. It will be the smallest current extremum; there may be more
     176             : 
     177             :             @return
     178             :             Returns true if there was at least one extremum found
     179             :         */
     180             :         bool getMinimumExtremumPosition(double& rfResult) const;
     181             : 
     182             :         /** Get all extremum pos of this segment
     183             : 
     184             :             This method will calculate all extremum positions of the segment
     185             :             and add them to rResults if they are in the range ]0.0 .. 1.0[
     186             : 
     187             :             @param rResults
     188             :             The vector of doubles where the results will be added. Evtl.
     189             :             existing contents will be removed since an empty vector is a
     190             :             necessary result to express that there are no extreme positions
     191             :             anymore. Since there is an upper maximum of 4 values, it makes
     192             :             sense to use reserve(4) at the vector as preparation.
     193             :         */
     194             :         void getAllExtremumPositions(::std::vector< double >& rResults) const;
     195             :     };
     196             : } // end of namespace basegfx
     197             : 
     198             : #endif // INCLUDED_BASEGFX_CURVE_B2DCUBICBEZIER_HXX
     199             : 
     200             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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