public void setZoomInFactor(double factor) {
        this.zoomInFactor = factor;
    }

    /**
     * Returns the zoom out factor.
     *
     * @return The zoom out factor.
     *
     * @see #setZoomOutFactor(double)
     */
    public double getZoomOutFactor() {
        return this.zoomOutFactor;
    }

    /**
     * Sets the zoom out factor.
     *
     * @param factor  the factor.
     *
     * @see #getZoomOutFactor()
     */
    public void setZoomOutFactor(double factor) {
        this.zoomOutFactor = factor;