include/graphics/Sk1DPathEffect.h

/* include/graphics/Sk1DPathEffect.h
**
** Copyright 2006, Google Inc.
**
** Licensed under the Apache License, Version 2.0 (the "License"); 
** you may not use this file except in compliance with the License. 
** You may obtain a copy of the License at 
**
**     http://www.apache.org/licenses/LICENSE-2.0 
**
** Unless required by applicable law or agreed to in writing, software 
** distributed under the License is distributed on an "AS IS" BASIS, 
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
** See the License for the specific language governing permissions and 
** limitations under the License.
*/

#ifndef Sk1DPathEffect_DEFINED
#define Sk1DPathEffect_DEFINED

#include "SkPathEffect.h"
#include "SkPath.h"

class SkPathMeasure;

//  This class is not exported to java.
class Sk1DPathEffect : public SkPathEffect {
public:
    Sk1DPathEffect() {}

    //  This method is not exported to java.
    virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width);

protected:
    /** Called at the start of each contour, returns the initial offset
        into that contour.
    */
    virtual SkScalar begin(SkScalar contourLength);
    /** Called with the current distance along the path, with the current matrix
        for the point/tangent at the specified distance.
        Return the distance to travel for the next call. If return <= 0, then that
        contour is done.
    */
    virtual SkScalar next(SkPath* dst, SkScalar distance, SkPathMeasure&);

    Sk1DPathEffect(SkRBuffer& buffer) : SkPathEffect(buffer) {}

private:
    // illegal
    Sk1DPathEffect(const Sk1DPathEffect&);
    Sk1DPathEffect& operator=(const Sk1DPathEffect&);

    typedef SkPathEffect INHERITED;
};

class SkPath1DPathEffect : public Sk1DPathEffect {
public:
    enum Style {
        kTranslate_Style,   // translate the shape to each position
        kRotate_Style,      // rotate the shape about its center
        kMorph_Style,       // transform each point, and turn lines into curves
        
        kStyleCount
    };
    SkPath1DPathEffect(const SkPath& path, SkScalar advance, SkScalar phase, Style);

    // This method is not exported to java.
    virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width);

protected:
    virtual SkScalar begin(SkScalar contourLength);
    virtual SkScalar next(SkPath* dst, SkScalar distance, SkPathMeasure&);
    
private:
    SkPath      fPath;
    SkScalar    fAdvance, fPhase;
    Style       fStyle;
    
    typedef Sk1DPathEffect INHERITED;
};


#endif