ShadowUtilsSlide Class Reference

Inheritance diagram for ShadowUtilsSlide:

Public Member Functions
	ShadowUtilsSlide ()
void	load (SkScalar w, SkScalar h) override
bool	onChar (SkUnichar uni) override
void	draw (SkCanvas *canvas) override
Public Member Functions inherited from Slide
virtual SkISize	getDimensions () const
virtual void	gpuTeardown ()
virtual bool	animate (double nanos)
virtual void	resize (SkScalar winWidth, SkScalar winHeight)
virtual void	unload ()
virtual bool	onMouse (SkScalar x, SkScalar y, skui::InputState state, skui::ModifierKey modifiers)
virtual bool	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
const SkString &	getName ()
Public Member Functions inherited from SkRefCntBase
	SkRefCntBase ()
virtual	~SkRefCntBase ()
bool	unique () const
void	ref () const
void	unref () const

Additional Inherited Members
Protected Attributes inherited from Slide
SkString	fName

Detailed Description

Definition at line 25 of file ShadowUtilsSlide.cpp.

Constructor & Destructor Documentation

ShadowUtilsSlide()

ShadowUtilsSlide::ShadowUtilsSlide ( )

inline

Definition at line 37 of file ShadowUtilsSlide.cpp.

        : fZDelta(0)
        , fShowAmbient(true)
        , fShowSpot(true)
        , fUseAlt(false)
        , fShowObject(false)
        , fIgnoreShadowAlpha(false) {
        fName = "ShadowUtils";
    }

Member Function Documentation

draw()

void ShadowUtilsSlide::draw ( SkCanvas *  canvas )

inlineoverridevirtual

Implements Slide.

Definition at line 118 of file ShadowUtilsSlide.cpp.

                                         {
        this->drawBG(canvas);
 
        static constexpr int kW = 800;
        static constexpr SkScalar kPad = 15.f;
        static constexpr SkScalar kLightR = 100.f;
        static constexpr SkScalar kHeight = 50.f;
        static constexpr SkScalar kAmbientAlpha = 0.5f;
        static constexpr SkScalar kSpotAlpha = 0.5f;
        static constexpr SkPoint3 lightPos = { 250, 400, 500 };
 
        canvas->translate(3 * kPad, 3 * kPad);
        canvas->save();
        SkScalar x = 0;
        SkScalar dy = 0;
        SkTDArray<SkMatrix> matrices;
        matrices.append()->reset();
        matrices.append()->setRotate(33.f, 25.f, 25.f).postScale(1.2f, 0.8f, 25.f, 25.f);
        SkPaint greenPaint;
        greenPaint.setColor(SK_ColorGREEN);
        greenPaint.setAntiAlias(true);
        SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, std::max(1.0f, kHeight + fZDelta));
 
        // convex paths
        for (auto& m : matrices) {
            for (auto flags : { kNone_ShadowFlag, kTransparentOccluder_ShadowFlag }) {
                for (const auto& path : fConvexPaths) {
                    SkRect postMBounds = path.getBounds();
                    m.mapRect(&postMBounds);
                    SkScalar w = postMBounds.width() + kHeight;
                    SkScalar dx = w + kPad;
                    if (x + dx > kW - 3 * kPad) {
                        canvas->restore();
                        canvas->translate(0, dy);
                        canvas->save();
                        x = 0;
                        dy = 0;
                    }
 
                    canvas->save();
                    canvas->concat(m);
                    this->drawShadowedPath(canvas, path, zPlaneParams, greenPaint, kAmbientAlpha,
                                           lightPos, kLightR, kSpotAlpha, flags);
                    canvas->restore();
 
                    canvas->translate(dx, 0);
                    x += dx;
                    dy = std::max(dy, postMBounds.height() + kPad + kHeight);
                }
            }
        }
 
        // concave paths
        canvas->restore();
        canvas->translate(kPad, dy);
        canvas->save();
        x = kPad;
        dy = 0;
        for (auto& m : matrices) {
            for (const auto& path : fConcavePaths) {
                SkRect postMBounds = path.getBounds();
                m.mapRect(&postMBounds);
                SkScalar w = postMBounds.width();
                SkScalar dx = w + kPad;
 
                canvas->save();
                canvas->concat(m);
                this->drawShadowedPath(canvas, path, zPlaneParams, greenPaint, kAmbientAlpha,
                                       lightPos, kLightR, kSpotAlpha, kNone_ShadowFlag);
                canvas->restore();
 
                canvas->translate(dx, 0);
                x += dx;
                dy = std::max(dy, postMBounds.height() + kPad + kHeight);
            }
        }
 
        // Show where the light is in x,y as a circle (specified in device space).
        SkMatrix invCanvasM = canvas->getTotalMatrix();
        if (invCanvasM.invert(&invCanvasM)) {
            canvas->save();
            canvas->concat(invCanvasM);
            SkPaint blackPaint;
            blackPaint.setColor(SK_ColorBLACK);
            blackPaint.setAntiAlias(true);
            canvas->drawCircle(lightPos.fX, lightPos.fY, kLightR / 10.f, blackPaint);
            canvas->restore();
        }
    }

load()

void ShadowUtilsSlide::load ( SkScalar  w, SkScalar  h  )

inlineoverridevirtual

Reimplemented from Slide.

Definition at line 47 of file ShadowUtilsSlide.cpp.

                                               {
        fConvexPaths.push_back().addRoundRect(SkRect::MakeWH(50, 50), 10, 10);
        SkRRect oddRRect;
        oddRRect.setNinePatch(SkRect::MakeWH(50, 50), 9, 13, 6, 16);
        fConvexPaths.push_back().addRRect(oddRRect);
        fConvexPaths.push_back().addRect(SkRect::MakeWH(50, 50));
        fConvexPaths.push_back().addCircle(25, 25, 25);
        fConvexPaths.push_back().cubicTo(100, 50, 20, 100, 0, 0);
        fConvexPaths.push_back().addOval(SkRect::MakeWH(20, 60));
 
        // star
        fConcavePaths.push_back().moveTo(0.0f, -33.3333f);
        fConcavePaths.back().lineTo(9.62f, -16.6667f);
        fConcavePaths.back().lineTo(28.867f, -16.6667f);
        fConcavePaths.back().lineTo(19.24f, 0.0f);
        fConcavePaths.back().lineTo(28.867f, 16.6667f);
        fConcavePaths.back().lineTo(9.62f, 16.6667f);
        fConcavePaths.back().lineTo(0.0f, 33.3333f);
        fConcavePaths.back().lineTo(-9.62f, 16.6667f);
        fConcavePaths.back().lineTo(-28.867f, 16.6667f);
        fConcavePaths.back().lineTo(-19.24f, 0.0f);
        fConcavePaths.back().lineTo(-28.867f, -16.6667f);
        fConcavePaths.back().lineTo(-9.62f, -16.6667f);
        fConcavePaths.back().close();
 
        // dumbbell
        fConcavePaths.push_back().moveTo(50, 0);
        fConcavePaths.back().cubicTo(100, 25, 60, 50, 50, 0);
        fConcavePaths.back().cubicTo(0, -25, 40, -50, 50, 0);
    }

onChar()

bool ShadowUtilsSlide::onChar ( SkUnichar  uni )

inlineoverridevirtual

Reimplemented from Slide.

Definition at line 78 of file ShadowUtilsSlide.cpp.

                                        {
            bool handled = false;
            switch (uni) {
                case 'W':
                    fShowAmbient = !fShowAmbient;
                    handled = true;
                    break;
                case 'S':
                    fShowSpot = !fShowSpot;
                    handled = true;
                    break;
                case 'T':
                    fUseAlt = !fUseAlt;
                    handled = true;
                    break;
                case 'O':
                    fShowObject = !fShowObject;
                    handled = true;
                    break;
                case '>':
                    fZDelta += 0.5f;
                    handled = true;
                    break;
                case '<':
                    fZDelta -= 0.5f;
                    handled = true;
                    break;
                case '?':
                    fIgnoreShadowAlpha = !fIgnoreShadowAlpha;
                    handled = true;
                    break;
                default:
                    break;
            }
            if (handled) {
                return true;
            }
            return false;
    }

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

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