question: @ Override public double valueToJava2D ( double value , Rectangle2D dataArea , RectangleEdge edge ) { Range range = getRange ( ) ; double vmin = range . getLowerBound ( ) ; double vmax = range . getUpperBound ( ) ; double vp = getCycleBound ( ) ; if ( ( value < vmin ) || ( value > vmax ) ) { return Double . NaN ; } double jmin = 0.0 ; double jmax = 0.0 ; if ( RectangleEdge . isTopOrBottom ( edge ) ) { jmin = dataArea . getMinX ( ) ; jmax = dataArea . getMaxX ( ) ; } else if ( RectangleEdge . isLeftOrRight ( edge ) ) { jmax = dataArea . getMinY ( ) ; jmin = dataArea . getMaxY ( ) ; } if ( isInverted ( ) ) { if ( value == vp ) { return this . boundMappedToLastCycle ? jmin : jmax ; } else if ( value > vp ) { return jmax - ( value - vp ) * ( jmax - jmin ) / this . period ; } else { return jmin + ( vp - value ) * ( jmax - jmin ) / this . period ; } } else { if ( value == vp ) { return this . boundMappedToLastCycle ? jmax : jmin ; } else if ( value >= vp ) { return jmin + ( value - vp ) * ( jmax - jmin ) / this . period ; } else { return jmax - ( vp - value ) * ( jmax - jmin ) / this . period ; } } }
target:  Translates a value from data space to Java 2D space.