michael@0: /*
michael@0:  * Copyright 2006 The Android Open Source Project
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef Sk1DPathEffect_DEFINED
michael@0: #define Sk1DPathEffect_DEFINED
michael@0: 
michael@0: #include "SkPathEffect.h"
michael@0: #include "SkPath.h"
michael@0: 
michael@0: class SkPathMeasure;
michael@0: 
michael@0: // This class is not exported to java.
michael@0: class SK_API Sk1DPathEffect : public SkPathEffect {
michael@0: public:
michael@0:     virtual bool filterPath(SkPath* dst, const SkPath& src,
michael@0:                             SkStrokeRec*, const SkRect*) const SK_OVERRIDE;
michael@0: 
michael@0: protected:
michael@0:     /** Called at the start of each contour, returns the initial offset
michael@0:         into that contour.
michael@0:     */
michael@0:     virtual SkScalar begin(SkScalar contourLength) const = 0;
michael@0:     /** Called with the current distance along the path, with the current matrix
michael@0:         for the point/tangent at the specified distance.
michael@0:         Return the distance to travel for the next call. If return <= 0, then that
michael@0:         contour is done.
michael@0:     */
michael@0:     virtual SkScalar next(SkPath* dst, SkScalar dist, SkPathMeasure&) const = 0;
michael@0: 
michael@0: private:
michael@0:     typedef SkPathEffect INHERITED;
michael@0: };
michael@0: 
michael@0: class SK_API SkPath1DPathEffect : public Sk1DPathEffect {
michael@0: public:
michael@0:     enum Style {
michael@0:         kTranslate_Style,   // translate the shape to each position
michael@0:         kRotate_Style,      // rotate the shape about its center
michael@0:         kMorph_Style,       // transform each point, and turn lines into curves
michael@0: 
michael@0:         kStyleCount
michael@0:     };
michael@0: 
michael@0:     /** Dash by replicating the specified path.
michael@0:         @param path The path to replicate (dash)
michael@0:         @param advance The space between instances of path
michael@0:         @param phase distance (mod advance) along path for its initial position
michael@0:         @param style how to transform path at each point (based on the current
michael@0:                      position and tangent)
michael@0:     */
michael@0:     static SkPath1DPathEffect* Create(const SkPath& path, SkScalar advance, SkScalar phase,
michael@0:                                       Style style) {
michael@0:         return SkNEW_ARGS(SkPath1DPathEffect, (path, advance, phase, style));
michael@0:     }
michael@0: 
michael@0:     virtual bool filterPath(SkPath*, const SkPath&,
michael@0:                             SkStrokeRec*, const SkRect*) const SK_OVERRIDE;
michael@0: 
michael@0:     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPath1DPathEffect)
michael@0: 
michael@0: protected:
michael@0:     SkPath1DPathEffect(SkReadBuffer& buffer);
michael@0:     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
michael@0: 
michael@0:     // overrides from Sk1DPathEffect
michael@0:     virtual SkScalar begin(SkScalar contourLength) const SK_OVERRIDE;
michael@0:     virtual SkScalar next(SkPath*, SkScalar, SkPathMeasure&) const SK_OVERRIDE;
michael@0: 
michael@0: #ifdef SK_SUPPORT_LEGACY_PUBLICEFFECTCONSTRUCTORS
michael@0: public:
michael@0: #endif
michael@0:     SkPath1DPathEffect(const SkPath& path, SkScalar advance, SkScalar phase, Style);
michael@0: 
michael@0: private:
michael@0:     SkPath      fPath;          // copied from constructor
michael@0:     SkScalar    fAdvance;       // copied from constructor
michael@0:     SkScalar    fInitialOffset; // computed from phase
michael@0:     Style       fStyle;         // copied from constructor
michael@0: 
michael@0:     typedef Sk1DPathEffect INHERITED;
michael@0: };
michael@0: 
michael@0: #endif