question: protected double calculateCategorySize ( int categoryCount , Rectangle2D area , RectangleEdge edge ) { double result ; double available = 0.0 ; if ( ( edge == RectangleEdge . TOP ) || ( edge == RectangleEdge . BOTTOM ) ) { available = area . getWidth ( ) ; } else if ( ( edge == RectangleEdge . LEFT ) || ( edge == RectangleEdge . RIGHT ) ) { available = area . getHeight ( ) ; } if ( categoryCount > 1 ) { result = available * ( 1 - getLowerMargin ( ) - getUpperMargin ( ) - getCategoryMargin ( ) ) ; result = result / categoryCount ; } else { result = available * ( 1 - getLowerMargin ( ) - getUpperMargin ( ) ) ; } return result ; }
target:  Calculates the size (width or height, depending on the location of the axis) of a category.