private void readObject(ObjectInputStream stream) 
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.outlineStroke = SerialUtilities.readStroke(stream);
        this.outlinePaint = SerialUtilities.readPaint(stream);
        this.fillPaint = SerialUtilities.readPaint(stream);
        this.highlightPaint = SerialUtilities.readPaint(stream);