question: @ Override public double java2DToValue ( double java2DValue , Rectangle2D dataArea , RectangleEdge edge ) { Range range = getRange ( ) ; double vmax = range . getUpperBound ( ) ; double vp = getCycleBound ( ) ; double jmin = 0.0 ; double jmax = 0.0 ; if ( RectangleEdge . isTopOrBottom ( edge ) ) { jmin = dataArea . getMinX ( ) ; jmax = dataArea . getMaxX ( ) ; } else if ( RectangleEdge . isLeftOrRight ( edge ) ) { jmin = dataArea . getMaxY ( ) ; jmax = dataArea . getMinY ( ) ; } if ( isInverted ( ) ) { double jbreak = jmax - ( vmax - vp ) * ( jmax - jmin ) / this . period ; if ( java2DValue >= jbreak ) { return vp + ( jmax - java2DValue ) * this . period / ( jmax - jmin ) ; } else { return vp - ( java2DValue - jmin ) * this . period / ( jmax - jmin ) ; } } else { double jbreak = ( vmax - vp ) * ( jmax - jmin ) / this . period + jmin ; if ( java2DValue <= jbreak ) { return vp + ( java2DValue - jmin ) * this . period / ( jmax - jmin ) ; } else { return vp - ( jmax - java2DValue ) * this . period / ( jmax - jmin ) ; } } }
target:  Converts a coordinate from Java 2D space to data space.