ChartSlide Class Reference

Inheritance diagram for ChartSlide:

Public Member Functions
	ChartSlide ()
void	draw (SkCanvas *canvas) override
Public Member Functions inherited from Slide
virtual SkISize	getDimensions () const
virtual void	gpuTeardown ()
virtual void	draw (SkCanvas *canvas)=0
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	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 82 of file ChartSlide.cpp.

Constructor & Destructor Documentation

ChartSlide()

ChartSlide::ChartSlide ( )

inline

Definition at line 91 of file ChartSlide.cpp.

{ fName = "Chart"; }

Member Function Documentation

draw()

void ChartSlide::draw ( SkCanvas *  canvas )

inlineoverridevirtual

Implements Slide.

Definition at line 93 of file ChartSlide.cpp.

                                         {
        bool sizeChanged = false;
        if (canvas->getBaseLayerSize() != fSize) {
            fSize = canvas->getBaseLayerSize();
            sizeChanged = true;
        }
 
        SkScalar ySpread = SkIntToScalar(fSize.fHeight / 20);
 
        SkScalar height = SkIntToScalar(fSize.fHeight);
 
        if (sizeChanged) {
            int dataPointCount = std::max(fSize.fWidth / kPixelsPerTick + 1, 2);
 
            for (int i = 0; i < kNumGraphs; ++i) {
                SkScalar y = (kNumGraphs - i) * (height - ySpread) / (kNumGraphs + 1);
                fData[i].reset();
                gen_data(y, ySpread, dataPointCount, fData + i);
            }
        }
 
        canvas->clear(0xFFE0F0E0);
 
        static SkRandom colorRand;
        static SkColor gColors[kNumGraphs] = { 0x0 };
        if (0 == gColors[0]) {
            for (int i = 0; i < kNumGraphs; ++i) {
                gColors[i] = colorRand.nextU() | 0xff000000;
            }
        }
 
        static const SkScalar kStrokeWidth = SkIntToScalar(2);
        SkPaint plotPaint;
        SkPaint fillPaint;
        plotPaint.setAntiAlias(true);
        plotPaint.setStyle(SkPaint::kStroke_Style);
        plotPaint.setStrokeWidth(kStrokeWidth);
        plotPaint.setStrokeCap(SkPaint::kRound_Cap);
        plotPaint.setStrokeJoin(SkPaint::kRound_Join);
        fillPaint.setAntiAlias(true);
        fillPaint.setStyle(SkPaint::kFill_Style);
 
        SkPathBuilder plotPath, fillPath;
        SkTDArray<SkScalar>* prevData = nullptr;
 
        for (int i = 0; i < kNumGraphs; ++i) {
            gen_paths(fData[i],
                      prevData,
                      height,
                      0,
                      SkIntToScalar(kPixelsPerTick),
                      fShift,
                      &plotPath,
                      &fillPath);
 
            // Make the fills partially transparent
            fillPaint.setColor((gColors[i] & 0x00ffffff) | 0x80000000);
            canvas->drawPath(fillPath.detach(), fillPaint);
 
            plotPaint.setColor(gColors[i]);
            canvas->drawPath(plotPath.detach(), plotPaint);
 
            prevData = fData + i;
        }
 
        fShift += kShiftPerFrame;
    }

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

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