CubicCurveSlide Class Reference

Inheritance diagram for CubicCurveSlide:

Public Member Functions
	CubicCurveSlide ()
void	draw (SkCanvas *canvas) override
Public Member Functions inherited from ClickHandlerSlide
bool	onMouse (SkScalar x, SkScalar y, skui::InputState clickState, skui::ModifierKey modifierKeys) final
Public Member Functions inherited from Slide
virtual SkISize	getDimensions () const
virtual void	gpuTeardown ()
virtual bool	animate (double nanos)
virtual void	load (SkScalar winWidth, SkScalar winHeight)
virtual void	resize (SkScalar winWidth, SkScalar winHeight)
virtual void	unload ()
virtual bool	onChar (SkUnichar c)
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

Protected Member Functions
Click *	onFindClickHandler (SkScalar x, SkScalar y, skui::ModifierKey modi) override
bool	onClick (ClickHandlerSlide::Click *) override

Additional Inherited Members
Protected Attributes inherited from Slide
SkString	fName

Detailed Description

Definition at line 442 of file PathSlide.cpp.

Constructor & Destructor Documentation

CubicCurveSlide()

CubicCurveSlide::CubicCurveSlide ( )

inline

Definition at line 449 of file PathSlide.cpp.

                      {
        SkRandom rand;
        for (int i = 0; i < N; ++i) {
            fPts[i].fX = 20 + rand.nextUScalar1() * 640;
            fPts[i].fY = 20 + rand.nextUScalar1() * 480;
        }
        fName = "CubicCurve";
    }

Member Function Documentation

draw()

void CubicCurveSlide::draw ( SkCanvas *  canvas )

inlineoverridevirtual

Implements Slide.

Definition at line 458 of file PathSlide.cpp.

                                         {
        SkPaint paint;
        paint.setAntiAlias(true);
 
        {
            SkPath path;
            path.moveTo(fPts[0]);
            path.cubicTo(fPts[1], fPts[2], fPts[3]);
            paint.setStyle(SkPaint::kStroke_Style);
            canvas->drawPath(path, paint);
        }
 
        {
            paint.setColor(SK_ColorRED);
            SkScalar t[2];
            int n = compute_parallel_to_base(fPts, t);
            SkPoint loc;
            SkVector tan;
            for (int i = 0; i < n; ++i) {
                SkEvalCubicAt(fPts, t[i], &loc, &tan, nullptr);
                tan.setLength(30);
                canvas->drawLine(loc - tan, loc + tan, paint);
            }
            paint.setStrokeWidth(0.5f);
            canvas->drawLine(fPts[0], fPts[3], paint);
 
            paint.setColor(SK_ColorBLUE);
            paint.setStrokeWidth(6);
            SkEvalCubicAt(fPts, 0.5f, &loc, nullptr, nullptr);
            canvas->drawPoint(loc, paint);
 
            paint.setColor(0xFF008800);
            SkEvalCubicAt(fPts, 1.0f/3, &loc, nullptr, nullptr);
            canvas->drawPoint(loc, paint);
            SkEvalCubicAt(fPts, 2.0f/3, &loc, nullptr, nullptr);
            canvas->drawPoint(loc, paint);
 
       //     n = SkFindCubicInflections(fPts, t);
       //     printf("inflections %d %g %g\n", n, t[0], t[1]);
        }
 
        {
            paint.setStyle(SkPaint::kFill_Style);
            paint.setColor(SK_ColorRED);
            for (SkPoint p : fPts) {
                canvas->drawCircle(p.fX, p.fY, 8, paint);
            }
        }
    }

onClick()

bool CubicCurveSlide::onClick ( ClickHandlerSlide::Click *  )

inlineoverrideprotectedvirtual

Override to track clicks. Return true as long as you want to track the pen/mouse.

Implements ClickHandlerSlide.

Definition at line 523 of file PathSlide.cpp.

{ return false; }

onFindClickHandler()

Click * CubicCurveSlide::onFindClickHandler ( SkScalar  x, SkScalar  y, skui::ModifierKey  modi  )

inlineoverrideprotectedvirtual

Return a Click object to handle the click. onClick will be called repeatedly with the latest mouse state tracked on the Click object until it returns false.

Implements ClickHandlerSlide.

Definition at line 509 of file PathSlide.cpp.

                                                                                     {
        const SkScalar tol = 8;
        const SkRect r = SkRect::MakeXYWH(x - tol, y - tol, tol * 2, tol * 2);
        for (int i = 0; i < N; ++i) {
            if (r.intersects(SkRect::MakeXYWH(fPts[i].fX, fPts[i].fY, 1, 1))) {
                return new Click([this, i](Click* c) {
                    fPts[i] = c->fCurr;
                    return true;
                });
            }
        }
        return nullptr;
    }

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

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