question: @ Override public void zoomRangeAxes ( double factor , PlotRenderingInfo info , Point2D source , boolean useAnchor ) { final double sourceX = source . getX ( ) ; for ( int axisIdx = 0 ; axisIdx < getAxisCount ( ) ; axisIdx ++ ) { final ValueAxis axis = getAxis ( axisIdx ) ; if ( axis != null ) { if ( useAnchor ) { double anchorX = axis . java2DToValue ( sourceX , info . getDataArea ( ) , RectangleEdge . BOTTOM ) ; axis . resizeRange ( factor , anchorX ) ; } else { axis . resizeRange ( factor ) ; } } } }
target:  Multiplies the range on the range axis by the specified factor.