return x == drawing.points[shape.p1].x or y == drawing.points[shape.p1].y

    local p1 = drawing.points[shape.p1]
    local p2 = drawing.points[shape.p2]
    if p1.x == p2.x then
      if x ~= p1.x then return false end
      local y1,y2 = p1.y, p2.y
      if y1 > y2 then
        y1,y2 = y2,y1
      end
      return y >= y1*0.95 and y <= y2*1.05
    elseif p1.y == p2.y then
      if y ~= p1.y then return false end
      local x1,x2 = p1.x, p2.x
      if x1 > x2 then
        x1,x2 = x2,x1
      end
      return x >= x1*0.95 and x <= x2*1.05
    else
      assert(false)
    end