CircleProps = ref object
  color*: Option[Color]
  radius*: float
  stroke*: Option[Color]
  strokeWidth*: Option[float]

proc measureCircle(self: Element; availableSize: Vec2[float]; props: CircleProps): Vec2[
    float] {...}{.raises: [], tags: [].}

proc createCircle(props: CircleProps = CircleProps();
                 elemProps: ElemProps = ElemProps(); children: seq[Element] = @[]): Element {...}{.
    raises: [], tags: [].}

proc createCircle(color: Color; pos: Vec2[float]; radius: float): Element {...}{.raises: [],
    tags: [].}

proc createCircle(color: Color; radius: float): Element {...}{.raises: [], tags: [].}