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 "SkFlattenable.h" 12 #include "SkPathEffect.h" 13 #include "SkPath.h" 14 15 class SkPathMeasure; 16 17 // This class is not exported to java. 18 class SK_API Sk1DPathEffect : public SkPathEffect { 19 public: 20 protected: 21 bool onFilterPath(SkPath* dst, const SkPath& src, SkStrokeRec*, const SkRect*) const override; 22 23 /** Called at the start of each contour, returns the initial offset 24 into that contour. 25 */ 26 virtual SkScalar begin(SkScalar contourLength) const = 0; 27 /** Called with the current distance along the path, with the current matrix 28 for the point/tangent at the specified distance. 29 Return the distance to travel for the next call. If return <= 0, then that 30 contour is done. 31 */ 32 virtual SkScalar next(SkPath* dst, SkScalar dist, SkPathMeasure&) const = 0; 33 34 private: 35 typedef SkPathEffect INHERITED; 36 }; 37 38 class SK_API SkPath1DPathEffect : public Sk1DPathEffect { 39 public: 40 enum Style { 41 kTranslate_Style, // translate the shape to each position 42 kRotate_Style, // rotate the shape about its center 43 kMorph_Style, // transform each point, and turn lines into curves 44 45 kLastEnum_Style = kMorph_Style, 46 }; 47 48 /** Dash by replicating the specified path. 49 @param path The path to replicate (dash) 50 @param advance The space between instances of path 51 @param phase distance (mod advance) along path for its initial position 52 @param style how to transform path at each point (based on the current 53 position and tangent) 54 */ 55 static sk_sp<SkPathEffect> Make(const SkPath& path, SkScalar advance, SkScalar phase, Style); 56 57 protected: 58 SkPath1DPathEffect(const SkPath& path, SkScalar advance, SkScalar phase, Style); 59 void flatten(SkWriteBuffer&) const override; 60 bool onFilterPath(SkPath*, const SkPath&, SkStrokeRec*, const SkRect*) const override; 61 62 // overrides from Sk1DPathEffect 63 SkScalar begin(SkScalar contourLength) const override; 64 SkScalar next(SkPath*, SkScalar, SkPathMeasure&) const override; 65 66 private: 67 SK_FLATTENABLE_HOOKS(SkPath1DPathEffect) 68 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