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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkDashPathEffect_DEFINED
#define SkDashPathEffect_DEFINED
#include "SkPathEffect.h"
/** \class SkDashPathEffect
SkDashPathEffect is a subclass of SkPathEffect that implements dashing
*/
class SK_API SkDashPathEffect : public SkPathEffect {
public:
/** intervals: array containing an even number of entries (>=2), with
the even indices specifying the length of "on" intervals, and the odd
indices specifying the length of "off" intervals.
count: number of elements in the intervals array
phase: offset into the intervals array (mod the sum of all of the
intervals).
For example: if intervals[] = {10, 20}, count = 2, and phase = 25,
this will set up a dashed path like so:
5 pixels off
10 pixels on
20 pixels off
10 pixels on
20 pixels off
...
A phase of -5, 25, 55, 85, etc. would all result in the same path,
because the sum of all the intervals is 30.
Note: only affects stroked paths.
*/
static SkDashPathEffect* Create(const SkScalar intervals[], int count,
SkScalar phase) {
return SkNEW_ARGS(SkDashPathEffect, (intervals, count, phase));
}
virtual ~SkDashPathEffect();
virtual bool filterPath(SkPath* dst, const SkPath& src,
SkStrokeRec*, const SkRect*) const SK_OVERRIDE;
virtual bool asPoints(PointData* results, const SkPath& src,
const SkStrokeRec&, const SkMatrix&,
const SkRect*) const SK_OVERRIDE;
virtual DashType asADash(DashInfo* info) const SK_OVERRIDE;
virtual Factory getFactory() const SK_OVERRIDE;
static SkFlattenable* CreateProc(SkReadBuffer&);
protected:
SkDashPathEffect(SkReadBuffer&);
virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
#ifdef SK_SUPPORT_LEGACY_PUBLICEFFECTCONSTRUCTORS
public:
#endif
SkDashPathEffect(const SkScalar intervals[], int count, SkScalar phase);
private:
void setInternalMembers(SkScalar phase);
SkScalar* fIntervals;
int32_t fCount;
SkScalar fPhase;
// computed from phase
SkScalar fInitialDashLength;
int32_t fInitialDashIndex;
SkScalar fIntervalLength;
typedef SkPathEffect INHERITED;
};
#endif
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