if (useAnchor) {
            // get the source coordinate - this plot has always a VERTICAL
            // orientation
            double sourceX = source.getX();
            double anchorX = this.domainAxis.java2DToValue(sourceX, 
                    info.getDataArea(), RectangleEdge.BOTTOM);
            this.domainAxis.resizeRange(factor, anchorX);
        }
        else {
            this.domainAxis.resizeRange(factor);