左右canvas.drawArc，canvas.drawOval 和RectF 关联

1.paint.setStyle(Paint.Style.STROKE)

//    radius="100dp"

//    interRadius="40dp"

//    linearWidth="10dp"

//    stokenWidth="40dp"

        mPaint=new Paint();

        mPaint.setStyle(Paint.Style.STROKE);

        mPaint.setStrokeWidth(mStokenWidth);

        mPaint.setColor(Color.BLUE);

        mPaint.setAntiAlias(true);

        mPaint2=new Paint();

        mPaint2.setStyle(Paint.Style.STROKE);

        mPaint2.setColor(Color.BLACK);

        int left=mStokenWidth/2;

        int top=mStokenWidth/2;

        mRectF=new RectF();

        mRectF.left=left;

        mRectF.top=top;

        mRectF.right=(mRadius-left)*2;

        mRectF.bottom=(mRadius-top)*2;

onDraw

    @Override

    protected void onDraw(Canvas canvas) {

        super.onDraw(canvas);

        canvas.drawArc(mRectF, 0, 90, false, mPaint);

        mPaint.setColor(Color.RED);

        canvas.drawArc(mRectF, 90, 90, false, mPaint);

        mPaint.setColor(Color.YELLOW);

        canvas.drawArc(mRectF, 180, 90, false, mPaint);

        mPaint.setColor(Color.GRAY);

        canvas.drawArc(mRectF, 270, 90, false, mPaint);

        canvas.drawRect(mRectF,mPaint2);

    }

如图：左右canvas.drawArc，canvas.drawOval 和RectF 关联

2.paint.setStyle(Paint.Style.FILL)

效果例如以下

左右canvas.drawArc，canvas.drawOval 和RectF 关联

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RectF画的矩形刚好成为了扇形的外切矩形

说明当style 为stoken 的时候。rectf画出的举行每条边刚好在描边的中间

什么时候style至Fill什么时候，rect外整个图形长方形切割