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      1 /*
      2  * Copyright (C) 2006, 2007 Eric Seidel <eric (at) webkit.org>
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef PathTraversalState_h
     27 #define PathTraversalState_h
     28 
     29 #include "platform/PlatformExport.h"
     30 #include "platform/geometry/FloatPoint.h"
     31 
     32 namespace blink {
     33 
     34 class PLATFORM_EXPORT PathTraversalState {
     35 public:
     36     enum PathTraversalAction {
     37         TraversalTotalLength,
     38         TraversalPointAtLength,
     39         TraversalSegmentAtLength,
     40         TraversalNormalAngleAtLength
     41     };
     42 
     43     PathTraversalState(PathTraversalAction);
     44 
     45     float closeSubpath();
     46     float moveTo(const FloatPoint&);
     47     float lineTo(const FloatPoint&);
     48     float quadraticBezierTo(const FloatPoint& newControl, const FloatPoint& newEnd);
     49     float cubicBezierTo(const FloatPoint& newControl1, const FloatPoint& newControl2, const FloatPoint& newEnd);
     50 
     51     void processSegment();
     52 
     53 public:
     54     PathTraversalAction m_action;
     55     bool m_success;
     56 
     57     FloatPoint m_current;
     58     FloatPoint m_start;
     59 
     60     float m_totalLength;
     61     unsigned m_segmentIndex;
     62     float m_desiredLength;
     63 
     64     // For normal calculations
     65     FloatPoint m_previous;
     66     float m_normalAngle; // degrees
     67 };
     68 
     69 } // namespace blink
     70 
     71 #endif
     72