我画条形图。我想在列表的末尾画一个带有动画的加载栏（作为一个单独的函数），但是我不能调用@Composable函数。错误代码：
@Composable调用只能在@Composable函数的上下文中发生

@Composable
fun Chart(
    modifier: Modifier = Modifier,
    model: BarData
) {
    Column(modifier = modifier) {
        Canvas(
            modifier = Modifier
                .weight(1f)
                .fillMaxWidth()
            
        ) {
            val radius = 45f
            
            val (paidBarHeight, incomingBarHeight) = computeBarsHeights(
                paidRatioAnim,
                incomingRatioAnim,
                size
            )

            if(!model.isLoading) {
                rotate(180f, pivot = size.center) {
                    drawRoundRect(
                        color = ChartBackgroundGreyColor,
                        size = size.copy(height = incomingBarHeight),
                        cornerRadius = CornerRadius(radius, radius)
                    )
                    drawRoundRect(
                        color = ChartBasicGreenColor,
                        size = size.copy(height = paidBarHeight),
                        cornerRadius = CornerRadius(radius, radius)
                    )
                }
            } else {
                //HOW TO DRAW LOADING BAR
            }
        }

} }个文件夹