Print points based on 4 - way symmetry
document . write ( " " + ( x + xc ) . toFixed ( 5 ) + " " + ( y + yc ) . toFixed ( 5 ) + " " + " " ) ; document . write ( " " + ( - x + xc ) . toFixed ( 5 ) + " " + ( y + yc ) . toFixed ( 5 ) + " " + " " ) ; document . write ( " " + ( x + xc ) . toFixed ( 5 ) + " " + ( - y + yc ) . toFixed ( 5 ) + " " + " " ) ; document . write ( " " + ( - x + xc ) . toFixed ( 5 ) + " " + ( - y + yc ) . toFixed ( 5 ) + " " + " " ) ;