PathTextSlide::MovingGlyphAnimator Class Reference

Inheritance diagram for PathTextSlide::MovingGlyphAnimator:

Classes
struct	Velocity

Public Member Functions
	MovingGlyphAnimator (Glyph *glyphs)
	~MovingGlyphAnimator () override
void	reset (SkRandom *rand, int screenWidth, int screenHeight) override
bool	animate (double nanos, int screenWidth, int screenHeight) final
virtual void	runAnimationTask (double t, double dt, int w, int h)
virtual void	swapAnimationBuffers ()
void	draw (SkCanvas *canvas) override
Public Member Functions inherited from PathTextSlide::GlyphAnimator
	GlyphAnimator (Glyph *glyphs)
virtual	~GlyphAnimator ()

Protected Attributes
Velocity	fVelocities [kNumPaths]
std::unique_ptr< SkMatrix[]>	fFrontMatrices
std::unique_ptr< SkMatrix[]>	fBackMatrices
SkTaskGroup	fBackgroundAnimationTask
double	fLastTick
Protected Attributes inherited from PathTextSlide::GlyphAnimator
Glyph *const	fGlyphs

Detailed Description

Definition at line 153 of file PathTextSlide.cpp.

Constructor & Destructor Documentation

MovingGlyphAnimator()

PathTextSlide::MovingGlyphAnimator::MovingGlyphAnimator ( Glyph *  glyphs )

inline

Definition at line 155 of file PathTextSlide.cpp.

            : GlyphAnimator(glyphs)
            , fFrontMatrices(new SkMatrix[kNumPaths])
            , fBackMatrices(new SkMatrix[kNumPaths]) {
    }

~MovingGlyphAnimator()

PathTextSlide::MovingGlyphAnimator::~MovingGlyphAnimator ( )

inlineoverride

Definition at line 161 of file PathTextSlide.cpp.

                                    {
        fBackgroundAnimationTask.wait();
    }

Member Function Documentation

animate()

bool PathTextSlide::MovingGlyphAnimator::animate ( double  nanos, int  screenWidth, int  screenHeight  )

inlinefinalvirtual

Reimplemented from PathTextSlide::GlyphAnimator.

Definition at line 185 of file PathTextSlide.cpp.

                                                                        {
        fBackgroundAnimationTask.wait();
        this->swapAnimationBuffers();
 
        const double tsec = 1e-9 * nanos;
        const double dt = fLastTick ? (1e-9 * nanos - fLastTick) : 0;
        fBackgroundAnimationTask.add(std::bind(&MovingGlyphAnimator::runAnimationTask, this, tsec,
                                               dt, screenWidth, screenHeight));
        fLastTick = 1e-9 * nanos;
        return true;
    }

draw()

void PathTextSlide::MovingGlyphAnimator::draw ( SkCanvas *  canvas )

inlineoverridevirtual

Reimplemented from PathTextSlide::GlyphAnimator.

Reimplemented in PathTextSlide::WavyGlyphAnimator.

Definition at line 237 of file PathTextSlide.cpp.

                                         {
        for (int i = 0; i < kNumPaths; ++i) {
            SkAutoCanvasRestore acr(canvas, true);
            canvas->concat(fFrontMatrices[i]);
            canvas->drawPath(fGlyphs[i].fPath, fGlyphs[i].fPaint);
        }
    }

reset()

void PathTextSlide::MovingGlyphAnimator::reset ( SkRandom *  rand, int  screenWidth, int  screenHeight  )

inlineoverridevirtual

Reimplemented from PathTextSlide::GlyphAnimator.

Reimplemented in PathTextSlide::WavyGlyphAnimator.

Definition at line 165 of file PathTextSlide.cpp.

                                                                           {
        const SkScalar screensize = static_cast<SkScalar>(std::max(screenWidth, screenHeight));
 
        for (auto& v : fVelocities) {
            for (SkScalar* d : {&v.fDx, &v.fDy}) {
                SkScalar t = pow(rand->nextF(), 3);
                *d = ((1 - t) / 60 + t / 10) * (rand->nextBool() ? screensize : -screensize);
            }
 
            SkScalar t = pow(rand->nextF(), 25);
            v.fDSpin = ((1 - t) * 360 / 7.5 + t * 360 / 1.5) * (rand->nextBool() ? 1 : -1);
        }
 
        // Get valid front data.
        fBackgroundAnimationTask.wait();
        this->runAnimationTask(0, 0, screenWidth, screenHeight);
        std::copy_n(fBackMatrices.get(), kNumPaths, fFrontMatrices.get());
        fLastTick = 0;
    }

runAnimationTask()

virtual void PathTextSlide::MovingGlyphAnimator::runAnimationTask ( double  t, double  dt, int  w, int  h  )

inlinevirtual

Called on a background thread. Here we can only modify fBackMatrices.

Reimplemented in PathTextSlide::WavyGlyphAnimator.

Definition at line 200 of file PathTextSlide.cpp.

                                                                     {
        for (int idx = 0; idx < kNumPaths; ++idx) {
            Velocity* v = &fVelocities[idx];
            Glyph* glyph = &fGlyphs[idx];
            SkMatrix* backMatrix = &fBackMatrices[idx];
 
            glyph->fPosition.fX += v->fDx * dt;
            if (glyph->fPosition.x() < 0) {
                glyph->fPosition.fX -= 2 * glyph->fPosition.x();
                v->fDx = -v->fDx;
            } else if (glyph->fPosition.x() > w) {
                glyph->fPosition.fX -= 2 * (glyph->fPosition.x() - w);
                v->fDx = -v->fDx;
            }
 
            glyph->fPosition.fY += v->fDy * dt;
            if (glyph->fPosition.y() < 0) {
                glyph->fPosition.fY -= 2 * glyph->fPosition.y();
                v->fDy = -v->fDy;
            } else if (glyph->fPosition.y() > h) {
                glyph->fPosition.fY -= 2 * (glyph->fPosition.y() - h);
                v->fDy = -v->fDy;
            }
 
            glyph->fSpin += v->fDSpin * dt;
 
            backMatrix->setTranslate(glyph->fPosition.x(), glyph->fPosition.y());
            backMatrix->preScale(glyph->fZoom, glyph->fZoom);
            backMatrix->preRotate(glyph->fSpin);
            backMatrix->preTranslate(-glyph->fMidpt.x(), -glyph->fMidpt.y());
        }
    }

swapAnimationBuffers()

virtual void PathTextSlide::MovingGlyphAnimator::swapAnimationBuffers ( )

inlinevirtual

Reimplemented in PathTextSlide::WavyGlyphAnimator.

Definition at line 233 of file PathTextSlide.cpp.

                                        {
        std::swap(fFrontMatrices, fBackMatrices);
    }

Member Data Documentation

fBackgroundAnimationTask

SkTaskGroup PathTextSlide::MovingGlyphAnimator::fBackgroundAnimationTask

protected

Definition at line 254 of file PathTextSlide.cpp.

fBackMatrices

std::unique_ptr<SkMatrix[]> PathTextSlide::MovingGlyphAnimator::fBackMatrices

protected

Definition at line 253 of file PathTextSlide.cpp.

fFrontMatrices

std::unique_ptr<SkMatrix[]> PathTextSlide::MovingGlyphAnimator::fFrontMatrices

protected

Definition at line 252 of file PathTextSlide.cpp.

fLastTick

double PathTextSlide::MovingGlyphAnimator::fLastTick

protected

Definition at line 255 of file PathTextSlide.cpp.

fVelocities

Velocity PathTextSlide::MovingGlyphAnimator::fVelocities[kNumPaths]

protected

Definition at line 251 of file PathTextSlide.cpp.

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

• third_party/skia/tools/viewer/PathTextSlide.cpp