padding custom view canvas

I newbie to android and I have a question(probably dummy question ...) I am creating a custom view by extending View element.

I start to draw and notice that my drawings is clipped a little bit at the top and left boundaries.

what should I do to solved it out?

protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec){
        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        int chosenDimention = Math.min(widthSize, heightSize);
        setMeasuredDimension(chosenDimention, chosenDimention);
        Log.v(TAG, "onMeasure: "+chosenDimention);
    }

public void onDraw(Canvas canvas){

        drawBackground(canvas);
        Log.v(TAG, "onDraw");
        Canvas c = new Canvas(background);
        drawPie(c);


    }

private void drawPie(Canvas canvas){
        int width = getWidth();
        canvas.save(Canvas.MATRIX_SAVE_FLAG);
        canvas.scale(width, width);
// drawing stuff

        canvas.restore();
    }

Copyright Notice：Content Author:「user3319474」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/22914488/padding-custom-view-canvas