Sk1DPathEffect.h revision 6806fe87e0b39e283291c1a1c7d1d864230aa2aa 
1/*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef Sk1DPathEffect_DEFINED
9#define Sk1DPathEffect_DEFINED
10
11#include "SkPathEffect.h"
12#include "SkPath.h"
13
14class SkPathMeasure;
15
16// This class is not exported to java.
17class SK_API Sk1DPathEffect : public SkPathEffect {
18public:
19    virtual bool filterPath(SkPath* dst, const SkPath& src, SkStrokeRec*) SK_OVERRIDE;
20
21protected:
22    /** Called at the start of each contour, returns the initial offset
23        into that contour.
24    */
25    virtual SkScalar begin(SkScalar contourLength) = 0;
26    /** Called with the current distance along the path, with the current matrix
27        for the point/tangent at the specified distance.
28        Return the distance to travel for the next call. If return <= 0, then that
29        contour is done.
30    */
31    virtual SkScalar next(SkPath* dst, SkScalar distance, SkPathMeasure&) = 0;
32
33private:
34    typedef SkPathEffect INHERITED;
35};
36
37class SK_API SkPath1DPathEffect : public Sk1DPathEffect {
38public:
39    enum Style {
40        kTranslate_Style,   // translate the shape to each position
41        kRotate_Style,      // rotate the shape about its center
42        kMorph_Style,       // transform each point, and turn lines into curves
43
44        kStyleCount
45    };
46
47    /** Dash by replicating the specified path.
48        @param path The path to replicate (dash)
49        @param advance The space between instances of path
50        @param phase distance (mod advance) along path for its initial position
51        @param style how to transform path at each point (based on the current
52                     position and tangent)
53    */
54    SkPath1DPathEffect(const SkPath& path, SkScalar advance, SkScalar phase, Style);
55
56    virtual bool filterPath(SkPath*, const SkPath&, SkStrokeRec*) SK_OVERRIDE;
57
58    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPath1DPathEffect)
59
60protected:
61    SkPath1DPathEffect(SkFlattenableReadBuffer& buffer);
62    virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
63
64    // overrides from Sk1DPathEffect
65    virtual SkScalar begin(SkScalar contourLength) SK_OVERRIDE;
66    virtual SkScalar next(SkPath*, SkScalar distance, SkPathMeasure&) SK_OVERRIDE;
67
68private:
69    SkPath      fPath;          // copied from constructor
70    SkScalar    fAdvance;       // copied from constructor
71    SkScalar    fInitialOffset; // computed from phase
72    Style       fStyle;         // copied from constructor
73
74    typedef Sk1DPathEffect INHERITED;
75};
76
77#endif
78