A()

end

end

	-- return the height of a node. The result is scaled.
  local y = 0
  for i=1,#node.editor.lines do
    local line = node.editor.lines[i]
    if node.editor.line_cache[i] == nil then
      node.editor.line_cache[i] = {}
    end
    node.editor.line_cache[i].fragments = nil
    node.editor.line_cache[i].screen_line_starting_pos = nil
    Text.populate_screen_line_starting_pos(node.editor, i)
    y = y + node.editor.line_height*#node.editor.line_cache[i].screen_line_starting_pos
    Text.clear_screen_line_cache(node.editor, i)
  end
  return y

	-- return the height of a text editor node (explicit width). The result is unscaled.
	local y = 0
	for i=1,#node.editor.lines do
		local line = node.editor.lines[i]
		if node.editor.line_cache[i] == nil then
			node.editor.line_cache[i] = {}
		end
		node.editor.line_cache[i].fragments = nil
		node.editor.line_cache[i].screen_line_starting_pos = nil
		Text.populate_screen_line_starting_pos(node.editor, i)
		y = y + 20*1.3*#node.editor.line_cache[i].screen_line_starting_pos
		Text.clear_screen_line_cache(node.editor, i)
	end
	return y

		-- position cursor in node

	else
		Pan = {x=Viewport.x+x/Viewport.zoom,y=Viewport.y+y/Viewport.zoom}

		return

	-- pan surface
	Pan = {x=Viewport.x+x/Viewport.zoom,y=Viewport.y+y/Viewport.zoom}

vy = function(y)
	return scale(y-Viewport.y)
end

vy = function(sy)
	-- turn surface coordinates into viewport coordinates
	return scale(sy-Viewport.y)
end

vx = function(x)
	return scale(x-Viewport.x)
end

vx = function(sx)
	-- turn surface coordinates into viewport coordinates
	return scale(sx-Viewport.x)
end