if on_line(mx,my, shape) then

        if on_freehand(mx,my, shape) then

        love.graphics.line(pixels(shape.x1)+12,pixels(shape.y1)+line.y, pixels(shape.x2)+12,pixels(shape.y2)+line.y)

        prev = nil
        for _,point in ipairs(shape) do
          if prev then
            love.graphics.line(pixels(prev.x)+12,pixels(prev.y)+line.y, pixels(point.x)+12,pixels(point.y)+line.y)
          end
          prev = point
        end

      if line.pending.x1 then
        love.graphics.line(pixels(line.pending.x1)+12,pixels(line.pending.y1)+line.y, love.mouse.getX(),love.mouse.getY())

      prev = nil
      for _,point in ipairs(line.pending) do
        if prev then
          love.graphics.line(pixels(prev.x)+12,pixels(prev.y)+line.y, pixels(point.x)+12,pixels(point.y)+line.y)
        end
        prev = point

          table.insert(drawing.pending, {x=coord(love.mouse.getX()-12), y=coord(love.mouse.getY()-drawing.y)})

end
function love.mousereleased(x,y, button)
  if lines.current then
    if lines.current.pending then
      lines.current.pending.x2 = coord(x-12)
      lines.current.pending.y2 = coord(y-lines.current.y)
      table.insert(lines.current.shapes, lines.current.pending)
      lines.current.pending = {}
      lines.current = nil
    end
  end

        drawing.pending = {x1=coord(x-12), y1=coord(y-drawing.y)}

function love.mousereleased(x,y, button)
  if lines.current then
    if lines.current.pending then
      table.insert(lines.current.shapes, lines.current.pending)
      lines.current.pending = {}
      lines.current = nil
    end
  end
end

  elseif chord == 'C-l' then
    local drawing,i,shape = select_shape_at_mouse()
    if drawing then
      convert_line(drawing,i,shape)
    end

          if on_line(mx,my, shape) then

          if on_freehand(mx,my, shape) then

end
function convert_line(drawing, i, shape)
  -- Perhaps we should do a more sophisticated "simple linear regression"
  -- here:
  --   https://en.wikipedia.org/wiki/Linear_regression#Simple_and_multiple_linear_regression
  -- But this works well enough for close-to-linear strokes.
  drawing.shapes[i] = {shape[1], shape[#shape]}

  if math.abs(shape.x1-shape.x2) > math.abs(shape.y1-shape.y2) then
    shape.y2 = shape.y1

  local x1,y1 = shape[1].x, shape[1].y
  local x2,y2 = shape[#shape].x, shape[#shape].y
  if math.abs(x1-x2) > math.abs(y1-y2) then
    drawing.shapes[i] = {{x=x1, y=y1}, {x=x2, y=y1}}

    shape.x2 = shape.x1

    drawing.shapes[i] = {{x=x1, y=y1}, {x=x1, y=y2}}