public boolean isOutline() {
        return this.showOutline;
    }

    /**
     * Sets a flag that controls whether or not outlines of the areas are drawn
     * and sends a {@link RendererChangeEvent} to all registered listeners.
     *
     * @param show  the flag.
     * 
     * @see #isOutline()
     */
    public void setOutline(boolean show) {
        this.showOutline = show;
        fireChangeEvent();