question: public Point2D forward ( double lat , double lon , Point2D ret_val , boolean isRadians ) { if ( ! isRadians ) { lon = Math . toRadians ( lon ) ; lat = Math . toRadians ( lat ) ; } double lon_ = wrapLongitude ( lon - centerX ) ; double lat_ = normalizeLatitude ( lat ) ; int x = ( int ) ProjMath . roundAdjust ( spps_x * lon_ ) - ul . x ; int y = ( int ) ProjMath . roundAdjust ( - spps_y * lat_ ) + ul . y + oy ; ret_val . setLocation ( x , y ) ; return ret_val ; }
target:  Forward projects lat,lon into XY space and returns a Point2D.