利用Jetpack Compose實現繪製五角星效果

fun Modifier.customDraw(
    color: Color,
    starCount: Int = 5,
    checked: Boolean = false,
) =
    this.then(CustomDrawModifier(color, starCount, checked = checked))

class CustomDrawModifier(
    private val color: Color,
    private val starCount: Int = 5,//星的數量
    private var checked: Boolean = false,
) :
    DrawModifier {
    override fun ContentDrawScope.draw() {
        log("$size")
        val radiusOuter = if (size.width > size.height) size.height / 2 else size.width / 2 //五角星外圓徑
        val radiusInner = radiusOuter / 2 //五角星內圓半徑
        val startAngle = (-Math.PI / 2).toFloat() //開始繪製點的外徑角度
        val perAngle = (2 * Math.PI / starCount).toFloat() //兩個五角星兩個角直接的角度差
        val outAngles = (0 until starCount).map {
            val angle = it * perAngle + startAngle
            Offset(radiusOuter * cos(angle), radiusOuter * sin(angle))
        }//所有外圓角的頂點
        val innerAngles = (0 until starCount).map {
            val angle = it * perAngle + perAngle / 2 + startAngle
            Offset(radiusInner * cos(angle), radiusInner * sin(angle))
        }//所有內圓角的頂點
        val path = Path()//繪製五角星的所有內圓外圓的點連線線
        (0 until starCount).forEachIndexed { index, _ ->
            val outerX = outAngles[index].x
            val outerY = outAngles[index].y
            val innerX = innerAngles[index].x
            val innerY = innerAngles[index].y
//            drawCircle(Color.Red, radius = 3f, center = outAngles[index])
//            drawCircle(Color.Yellow, radius = 3f, center = innerAngles[index])
            if (index == 0) {
                path.moveTo(outerX, outerY)
                path.lineTo(innerX, innerY)
                path.lineTo(outAngles[(index + 1) % starCount].x,
                    outAngles[(index + 1) % starCount].y)
            } else {
                path.lineTo(innerX, innerY)//移動到內圓角的端點
                path.lineTo(outAngles[(index + 1) % starCount].x,
                    outAngles[(index + 1) % starCount].y)//連線到下一個外圓角的端點
            }
            if (index == starCount - 1) {
                path.close()
            }
        }
        translate(size.width / 2, size.height / 2) {
            drawPath(path, color, style = if (checked) Fill else Stroke(width = 5f))
        }
    }

}