ZoomAnimation Class Reference

Inheritance diagram for ZoomAnimation:

Public Member Functions
	ZoomAnimation (SkScalar zoomMax, double zoomPeriodMs)
const char *	getTag () override
void	preConcatFrameMatrix (double animationTimeMs, const SkIRect &devBounds, SkMatrix *drawMatrix) override
Public Member Functions inherited from SkRefCntBase
	SkRefCntBase ()
virtual	~SkRefCntBase ()
bool	unique () const
void	ref () const
void	unref () const

Detailed Description

Definition at line 44 of file SKPAnimationBench.cpp.

Constructor & Destructor Documentation

ZoomAnimation()

ZoomAnimation::ZoomAnimation ( SkScalar  zoomMax, double  zoomPeriodMs  )

inline

Definition at line 46 of file SKPAnimationBench.cpp.

        : fZoomMax(zoomMax)
        , fZoomPeriodMs(zoomPeriodMs) {
    }

Member Function Documentation

getTag()

const char * ZoomAnimation::getTag ( )

inlineoverridevirtual

Implements SKPAnimationBench::Animation.

Definition at line 51 of file SKPAnimationBench.cpp.

{ return "zoom"; }

preConcatFrameMatrix()

void ZoomAnimation::preConcatFrameMatrix ( double  animationTimeMs, const SkIRect &  devBounds, SkMatrix *  drawMatrix  )

inlineoverridevirtual

Implements SKPAnimationBench::Animation.

Definition at line 53 of file SKPAnimationBench.cpp.

                                                             {
        double t = fmod(animationTimeMs / fZoomPeriodMs, 1.0); // t is in [0, 1).
        t = fabs(2 * t - 1); // Make t ping-pong between 0 and 1
        SkScalar zoom = static_cast<SkScalar>(pow(fZoomMax, t));
 
        SkPoint center = SkPoint::Make((devBounds.fLeft + devBounds.fRight) / 2.0f,
                                       (devBounds.fTop + devBounds.fBottom) / 2.0f);
        drawMatrix->preTranslate(center.fX, center.fY);
        drawMatrix->preScale(zoom, zoom);
        drawMatrix->preTranslate(-center.fX, -center.fY);
    }

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The documentation for this class was generated from the following file:

• third_party/skia/bench/SKPAnimationBench.cpp