EdgeClipSlide Class Reference

Inheritance diagram for EdgeClipSlide:

Classes
class	DoNothingClick
class	DragPolyClick
class	DragRectClick
class	MyClick
class	VertClick

Public Member Functions
	EdgeClipSlide ()
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

Static Public Member Functions
static SkScalar	snap (SkScalar x)
static SkPoint	snap (const SkPoint &pt)
static void	snap (SkPoint dst[], const SkPoint src[], int count)
static bool	hit_test (const SkPoint &pt, SkScalar x, SkScalar y)

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

Additional Inherited Members
Protected Attributes inherited from Slide
SkString	fName

Detailed Description

Definition at line 145 of file PathClipSlide.cpp.

Constructor & Destructor Documentation

EdgeClipSlide()

EdgeClipSlide::EdgeClipSlide ( )

inline

Definition at line 154 of file PathClipSlide.cpp.

                    : fClip(SkRect::MakeLTRB(150, 150, 550, 450)) {
        fPoly[0].set(300, 40);
        fPoly[1].set(550, 250);
        fPoly[2].set(40, 450);
 
        fEdgeColor[0] = 0xFFFF0000;
        fEdgeColor[1] = 0xFF00FF00;
        fEdgeColor[2] = 0xFF0000FF;
        fName = "EdgeClip";
    }

Member Function Documentation

draw()

void EdgeClipSlide::draw ( SkCanvas *  canvas )

inlineoverridevirtual

Implements Slide.

Definition at line 177 of file PathClipSlide.cpp.

                                         {
        SkPath path;
        path.addPoly(fPoly, N, true);
 
        // Draw the full triangle, stroked and filled
        SkPaint p;
        p.setAntiAlias(true);
        p.setColor(0xFFE0E0E0);
        canvas->drawPath(path, p);
        p.setStyle(SkPaint::kStroke_Style);
        p.setStrokeWidth(2);
        for (int i = 0; i < N; ++i) {
            const int j = (i + 1) % N;
            p.setColor(fEdgeColor[i]);
            p.setAlpha(0x88);
            canvas->drawLine(fPoly[i], fPoly[j], p);
        }
        p.setStyle(SkPaint::kFill_Style);
 
        // Draw the clip itself
        p.setColor(0xFF8888CC);
        canvas->drawRect(fClip, p);
 
        // Draw the filled triangle through the clip
        p.setColor(0xFF88CC88);
        canvas->save();
        canvas->clipRect(fClip);
        canvas->drawPath(path, p);
        canvas->restore();
 
        p.setStyle(SkPaint::kStroke_Style);
        p.setStrokeWidth(6);
 
        // Draw each of the "Edges" that survived the clipping
        // We use a layer, so we can PLUS the different edge-colors, showing where two edges
        // canceled each other out.
        canvas->saveLayer(nullptr, nullptr);
        p.setBlendMode(SkBlendMode::kPlus);
        for (int i = 0; i < N; ++i) {
            const int j = (i + 1) % N;
            p.setColor(fEdgeColor[i]);
            draw_clipped_line(canvas, fClip, fPoly[i], fPoly[j], p);
        }
        canvas->restore();
    }

hit_test()

static bool EdgeClipSlide::hit_test ( const SkPoint &  pt, SkScalar  x, SkScalar  y  )

inlinestatic

Definition at line 268 of file PathClipSlide.cpp.

                                                                    {
        const SkScalar rad = 8;
        const SkScalar dx = pt.x() - x;
        const SkScalar dy = pt.y() - y;
        return dx*dx + dy*dy <= rad*rad;
    }

onClick()

bool EdgeClipSlide::onClick ( Click *  )

inlineoverrideprotectedvirtual

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

Implements ClickHandlerSlide.

Definition at line 295 of file PathClipSlide.cpp.

                                        {
        ((MyClick*)click)->handleMove();
        return true;
    }

onFindClickHandler()

Click * EdgeClipSlide::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 276 of file PathClipSlide.cpp.

                                                                                {
        for (int i = 0; i < N; ++i) {
            if (hit_test(fPoly[i], x, y)) {
                return new VertClick(&fPoly[i]);
            }
        }
 
        SkPath path;
        path.addPoly(fPoly, N, true);
        if (path.contains(x, y)) {
            return new DragPolyClick(fPoly, N);
        }
 
        if (fClip.intersects(SkRect::MakeLTRB(x - 1, y - 1, x + 1, y + 1))) {
            return new DragRectClick(&fClip);
        }
        return new DoNothingClick();
    }

snap() [1/3]

static SkPoint EdgeClipSlide::snap ( const SkPoint &  pt )

inlinestatic

Definition at line 168 of file PathClipSlide.cpp.

                                           {
        return SkPoint::Make(snap(pt.x()), snap(pt.y()));
    }

snap() [2/3]

static void EdgeClipSlide::snap ( SkPoint  dst[], const SkPoint  src[], int  count  )

inlinestatic

Definition at line 171 of file PathClipSlide.cpp.

                                                                    {
        for (int i = 0; i < count; ++i) {
            dst[i] = snap(src[i]);
        }
    }

snap() [3/3]

static SkScalar EdgeClipSlide::snap ( SkScalar  x )

inlinestatic

Definition at line 165 of file PathClipSlide.cpp.

                                     {
        return SkScalarRoundToScalar(x * 0.5f) * 2;
    }

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

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