def echo_on(screen, cursor)
			each_char do |c|
				w = width(c)
				cursor.fit!(w)
				screen.write(c, w, cursor.cur_col, cursor.cur_row, @sgr.dup)
				cursor.advance!(w)
			end
			return self
		end
def echo_on(screen, cursor)
			each_char do |c|
				w = width(c)
				cursor.fit!(w)
				screen.write(c, w, cursor.cur_col, cursor.cur_row, @sgr.dup)
				cursor.advance!(w)
			end
			return self
		end
Select Graphic Rendition associated with the text
 echo the string onto the _screen_ with initial cursor as _cursor_
 _cursor_ position will be changed as the string is echoed