reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef Sk1DPathEffect_DEFINED |
| 18 | #define Sk1DPathEffect_DEFINED |
| 19 | |
| 20 | #include "SkPathEffect.h" |
| 21 | #include "SkPath.h" |
| 22 | |
| 23 | class SkPathMeasure; |
| 24 | |
| 25 | // This class is not exported to java. |
| 26 | class Sk1DPathEffect : public SkPathEffect { |
| 27 | public: |
| 28 | // override from SkPathEffect |
| 29 | virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width); |
| 30 | |
| 31 | protected: |
| 32 | /** Called at the start of each contour, returns the initial offset |
| 33 | into that contour. |
| 34 | */ |
| 35 | virtual SkScalar begin(SkScalar contourLength) = 0; |
| 36 | /** Called with the current distance along the path, with the current matrix |
| 37 | for the point/tangent at the specified distance. |
| 38 | Return the distance to travel for the next call. If return <= 0, then that |
| 39 | contour is done. |
| 40 | */ |
| 41 | virtual SkScalar next(SkPath* dst, SkScalar distance, SkPathMeasure&) = 0; |
| 42 | |
| 43 | private: |
| 44 | typedef SkPathEffect INHERITED; |
| 45 | }; |
| 46 | |
| 47 | class SkPath1DPathEffect : public Sk1DPathEffect { |
| 48 | public: |
| 49 | enum Style { |
| 50 | kTranslate_Style, // translate the shape to each position |
| 51 | kRotate_Style, // rotate the shape about its center |
| 52 | kMorph_Style, // transform each point, and turn lines into curves |
| 53 | |
| 54 | kStyleCount |
| 55 | }; |
| 56 | |
| 57 | /** Dash by replicating the specified path. |
| 58 | @param path The path to replicate (dash) |
| 59 | @param advance The space between instances of path |
| 60 | @param phase distance (mod advance) along path for its initial position |
| 61 | @param style how to transform path at each point (based on the current |
| 62 | position and tangent) |
| 63 | */ |
| 64 | SkPath1DPathEffect(const SkPath& path, SkScalar advance, SkScalar phase, Style); |
| 65 | |
| 66 | // override from SkPathEffect |
| 67 | virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width); |
| 68 | |
| 69 | protected: |
| 70 | SkPath1DPathEffect(SkFlattenableReadBuffer& buffer); |
| 71 | |
| 72 | // overrides from Sk1DPathEffect |
| 73 | virtual SkScalar begin(SkScalar contourLength); |
| 74 | virtual SkScalar next(SkPath* dst, SkScalar distance, SkPathMeasure&); |
| 75 | // overrides from SkFlattenable |
| 76 | virtual void flatten(SkFlattenableWriteBuffer& ); |
| 77 | virtual Factory getFactory() { return CreateProc; } |
| 78 | |
| 79 | private: |
| 80 | SkPath fPath; // copied from constructor |
| 81 | SkScalar fAdvance; // copied from constructor |
| 82 | SkScalar fInitialOffset; // computed from phase |
| 83 | Style fStyle; // copied from constructor |
| 84 | |
| 85 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 86 | return SkNEW_ARGS(SkPath1DPathEffect, (buffer)); |
| 87 | } |
| 88 | |
| 89 | typedef Sk1DPathEffect INHERITED; |
| 90 | }; |
| 91 | |
| 92 | |
| 93 | #endif |