1/*
2 * Copyright (C) 2006, 2007 Eric Seidel <eric@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
32namespace blink {
33
34class PLATFORM_EXPORT PathTraversalState {
35public:
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
53public:
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