mode = ''

      love.graphics.setColor(0,0,0)

        if shape.selected then
          love.graphics.setColor(1,0,0)
        else
          love.graphics.setColor(0,0,0)
        end

  if love.mouse.isDown('1') then

  if love.mouse.isDown('1') and mode == 'draw' then

  mode = 'grab'

        for _,shape in ipairs(drawing.shapes) do
          if on_freehand(x,y, shape) then
            shape.selected = true
            return
          end
        end

  mode = 'draw'

function on_freehand(x,y, shape)
  local prev
  for _,p in ipairs(shape) do
    if prev then
      if on_line(x,y, {x1=prev.x,y1=prev.y, x2=p.x,y2=p.y}) then
        return true
      end
    end
    prev = p
  end
  return false
end
function on_line(x,y, shape)
  if shape.x1 == shape.x2 then
    local y1,y2 = shape.y1,shape.y2
    if y1 > y2 then
      y1,y2 = y2,y2
    end
    return y >= y1 and y <= y2
  end
  -- has the right slope and intercept
  local m = (shape.y2 - shape.y1) / (shape.x2 - shape.x1)
  local yp = shape.y1 + m*(x-shape.x1)
  if yp < 0.95*y or yp > 1.05*y then
    return false
  end
  -- between endpoints
  local k = (x-shape.x1) / (shape.x2-shape.x1)
  return k > -0.05 and k < 1.05
end