DashCircleGM Class Reference

Inheritance diagram for DashCircleGM:

Public Member Functions
	DashCircleGM ()
Public Member Functions inherited from skiagm::GM
	GM (SkColor backgroundColor=SK_ColorWHITE)
virtual	~GM ()
void	setMode (Mode mode)
Mode	getMode () const
DrawResult	gpuSetup (SkCanvas *, SkString *errorMsg, GraphiteTestContext *=nullptr)
void	gpuTeardown ()
void	onceBeforeDraw ()
DrawResult	draw (SkCanvas *canvas)
DrawResult	draw (SkCanvas *, SkString *errorMsg)
void	drawBackground (SkCanvas *)
DrawResult	drawContent (SkCanvas *canvas)
DrawResult	drawContent (SkCanvas *, SkString *errorMsg)
virtual bool	runAsBench () const
SkScalar	width ()
SkScalar	height ()
SkColor	getBGColor () const
void	setBGColor (SkColor)
void	drawSizeBounds (SkCanvas *, SkColor)
bool	animate (double)
virtual bool	onChar (SkUnichar)
bool	getControls (SkMetaData *controls)
void	setControls (const SkMetaData &controls)
virtual void	modifyGrContextOptions (GrContextOptions *)
virtual void	modifyGraphiteContextOptions (skgpu::graphite::ContextOptions *) const
virtual bool	isBazelOnly () const
virtual std::map< std::string, std::string >	getGoldKeys () const

Protected Member Functions
SkString	getName () const override
SkISize	getISize () override
void	onDraw (SkCanvas *canvas) override
bool	onAnimate (double nanos) override
Protected Member Functions inherited from skiagm::GM
virtual DrawResult	onGpuSetup (SkCanvas *, SkString *, GraphiteTestContext *)
virtual void	onGpuTeardown ()
virtual void	onOnceBeforeDraw ()
virtual DrawResult	onDraw (SkCanvas *, SkString *errorMsg)
virtual bool	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
GraphiteTestContext *	graphiteTestContext () const

Additional Inherited Members
Public Types inherited from skiagm::GM
enum	Mode { kGM_Mode , kSample_Mode , kBench_Mode }
using	DrawResult = skiagm::DrawResult
using	GraphiteTestContext = skiatest::graphite::GraphiteTestContext
Static Public Attributes inherited from skiagm::GM
static constexpr char	kErrorMsg_DrawSkippedGpuOnly []

Detailed Description

Definition at line 40 of file dashcircle.cpp.

Constructor & Destructor Documentation

DashCircleGM()

DashCircleGM::DashCircleGM ( )

inline

Definition at line 42 of file dashcircle.cpp.

: fRotation(0) { }

Member Function Documentation

getISize()

SkISize DashCircleGM::getISize ( )

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 47 of file dashcircle.cpp.

{ return SkISize::Make(900, 1200); }

getName()

SkString DashCircleGM::getName ( ) const

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 45 of file dashcircle.cpp.

{ return SkString("dashcircle"); }

onAnimate()

bool DashCircleGM::onAnimate ( double  nanos )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 107 of file dashcircle.cpp.

                                          {
        constexpr SkScalar kDesiredDurationSecs = 100.0f;
 
        fRotation = TimeUtils::Scaled(1e-9 * nanos, 360.0f/kDesiredDurationSecs, 360.0f);
        return true;
    }

onDraw()

void DashCircleGM::onDraw ( SkCanvas *  canvas )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 49 of file dashcircle.cpp.

                                           {
        SkPaint refPaint;
        refPaint.setAntiAlias(true);
        refPaint.setColor(0xFFbf3f7f);
        refPaint.setStroke(true);
        refPaint.setStrokeWidth(1);
        const SkScalar radius = 125;
        SkRect oval = SkRect::MakeLTRB(-radius - 20, -radius - 20, radius + 20, radius + 20);
        SkPath circle = SkPath::Circle(0, 0, radius);
        SkScalar circumference = radius * SK_ScalarPI * 2;
        int wedges[] = { 6, 12, 36 };
        canvas->translate(radius+20, radius+20);
        for (int wedge : wedges) {
            SkScalar arcLength = 360.f / wedge;
            canvas->save();
            for (const DashExample& dashExample : dashExamples) {
                SkPathBuilder refPath;
                int dashUnits = 0;
                for (int index = 0; index < dashExample.length; ++index) {
                    dashUnits += dashExample.pattern[index];
                }
                SkScalar unitLength = arcLength / dashUnits;
                SkScalar angle = 0;
                for (int index = 0; index < wedge; ++index) {
                    for (int i2 = 0; i2 < dashExample.length; i2 += 2) {
                        SkScalar span = dashExample.pattern[i2] * unitLength;
                        refPath.moveTo(0, 0);
                        refPath.arcTo(oval, angle, span, false);
                        refPath.close();
                        angle += span + (dashExample.pattern[i2 + 1]) * unitLength;
                    }
                }
                canvas->save();
                canvas->rotate(fRotation);
                canvas->drawPath(refPath.detach(), refPaint);
                canvas->restore();
                SkPaint p;
                p.setAntiAlias(true);
                p.setStroke(true);
                p.setStrokeWidth(10);
                SkScalar intervals[4];
                int intervalCount = dashExample.length;
                SkScalar dashLength = circumference / wedge / dashUnits;
                for (int index = 0; index < dashExample.length; ++index) {
                    intervals[index] = dashExample.pattern[index] * dashLength;
                }
                p.setPathEffect(SkDashPathEffect::Make(intervals, intervalCount, 0));
                canvas->save();
                canvas->rotate(fRotation);
                canvas->drawPath(circle, p);
                canvas->restore();
                canvas->translate(0, radius * 2 + 50);
            }
            canvas->restore();
            canvas->translate(radius * 2 + 50, 0);
        }
    }

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

• third_party/skia/gm/dashcircle.cpp