afreechart/src/main/java/org/afree/chart/axis/NumberAxis.java
/**
     * Calculates the value of the lowest visible tick on the axis.
     * 
     * @return The value of the lowest visible tick on the axis.
     * 
     * @see #calculateHighestVisibleTickValue()
     */
Calculates the value of the lowest visible tick on the axis.

@return The value of the lowest visible tick on the axis.


Calculates the value of the lowest visible tick on the axis . @return The value of the lowest visible tick on the axis .
protected double calculateLowestVisibleTickValue() {
        double unit = getTickUnit().getSize();
        double index = Math.ceil(this.mRange.getLowerBound() / unit);
        return index * unit;
    }
protected double calculateLowestVisibleTickValue ( ) { double unit = getTickUnit ( ) . getSize ( ) ; double index = Math . ceil ( this . mRange . getLowerBound ( ) / unit ) ; return index * unit ; }
Calculates the value of the lowest visible tick on the axis.
Calculates the value of the lowest visible tick on the axis .
//performance tuning //        double index = Math.ceil(getRange().getLowerBound() / unit);