-- return values:
--  y coordinate drawn until in px
--  position of start of final screen line drawn
function Text.draw(State, line_index)

-- draw a line starting from startpos to screen at y between State.left and State.right
-- return the final y, and position of start of final screen line drawn
function Text.draw(State, line_index, y, startpos)

  line.starty = y
  line.startpos = startpos

  local y = line.starty

      line.starty = y
      line.startpos = 1

      local startpos = 1

        line.startpos = State.screen_top1.pos

        startpos = State.screen_top1.pos

      y, State.screen_bottom1.pos = Text.draw(State, line_index)

      y, State.screen_bottom1.pos = Text.draw(State, line_index, y, startpos)