question: private float [ ] calculateShiftToPositionBBoxOfPointsAt ( float left , float top , List < Point > points ) { double minX = Double . MAX_VALUE ; double maxY = - Double . MAX_VALUE ; for ( Point point : points ) { minX = Math . min ( point . getX ( ) , minX ) ; maxY = Math . max ( point . getY ( ) , maxY ) ; } float dx = ( float ) ( left - minX ) ; float dy = ( float ) ( top - maxY ) ; return new float [ ] { dx , dy } ; }
target:  This method calculates the shift needed to be applied to the points in order to position upper and left borders of their bounding box at the given lines.