@Override
    protected void onDraw(Canvas canvas) {
        if (mSignatureBitmap != null) {
            canvas.drawBitmap(mSignatureBitmap, 0, 0, mPaint);
        }
    }
Set the velocity filter weight.

@param velocityFilterWeight the weight.
signature-pad/src/main/java/com/github/gcacace/signaturepad/views/SignaturePad.java