question: public void computeParameters ( ) { if ( ellps == null ) { ellps = Ellipsoid . WGS_84 ; } if ( mode == MODE_BELGIUM ) { alpha = 0.00014204d ; } else { alpha = 0d ; } double phi1 = ProjMath . degToRad ( lambert_sp_one ) ; double phi2 = ProjMath . degToRad ( lambert_sp_two ) ; double phif = ProjMath . degToRad ( referenceLatitude ) ; double e = ellps . ecc ; double sinphi ; sinphi = Math . sin ( phi1 ) ; double m1 = lambMsfn ( sinphi , Math . cos ( phi1 ) , e ) ; double t1 = lambTsfn ( phi1 , sinphi , e ) ; if ( MoreMath . approximately_equal ( phi1 , phi2 , EPS10 ) ) { n = sinphi ; } else { sinphi = Math . sin ( phi2 ) ; double m2 = lambMsfn ( sinphi , Math . cos ( phi2 ) , e ) ; double t2 = lambTsfn ( phi2 , sinphi , e ) ; n = Math . log ( m1 / m2 ) / Math . log ( t1 / t2 ) ; } F = m1 / ( n * Math . pow ( t1 , n ) ) ; if ( MoreMath . approximately_equal ( phi1 , phi2 , EPS10 ) ) { rf = 0.0d ; } else { rf = ellps . radius * F * Math . pow ( lambTsfn ( phif , Math . sin ( phif ) , e ) , n ) ; } lamdaf = ProjMath . degToRad ( centralMeridian ) ; locationCenterXPixel = ( ( double ) getWidth ( ) / 2d ) ; locationCenterYPixel = ( ( double ) getHeight ( ) / 2d ) ; locationPixelsPerLambert = ( double ) getPPM ( ) / getScale ( ) ; LatLonPoint origin = new LatLonPoint . Double ( referenceLatitude , centralMeridian ) ; Point2D lp = LLToWorld ( origin . getY ( ) , origin . getX ( ) , new Point2D . Double ( ) ) ; locationOriginX = lp . getX ( ) ; locationOriginY = lp . getY ( ) ; LatLonPoint center = getCenter ( ) ; lp = LLToWorld ( center . getY ( ) , center . getX ( ) , lp ) ; locationCenterXLambert = lp . getX ( ) ; locationCenterYLambert = lp . getY ( ) ; locationOriginXfPixel = locationCenterXPixel + ( locationOriginX - locationCenterXLambert ) * locationPixelsPerLambert ; locationOriginYfPixel = locationCenterYPixel - ( locationOriginY - locationCenterYLambert ) * locationPixelsPerLambert ; if ( Debug . debugging ( "Lambert" ) ) { Debug . output ( "Creating LambertConformal: center x = " + locationCenterXLambert + ", center y = " + locationCenterYLambert ) ; Debug . output ( "Creating LambertConformal: origin x = " + locationOriginX + ", origin y = " + locationOriginY ) ; } }
target:  Called when some fundamental parameters change. <p> Each projection will decide how to respond to this change. For instance, they may need to recalculate "constant" parameters used in the forward() and inverse() calls. <p>