Build Coupon UI - Top right corner (https://medium.com/@akexorcist/how-we-built-developer-friendly-coupon-ui-in-android-part-2-78933730d335)

CouponLayout.kt

val canvas: Canvas = /* ... */
val areaWidth = canvas.width
val areaHeight = canvas.height
val borderWidth = 2
val cornerRadius = 10
val semiCircleRadius = 20

val path = Path().apply {
    /* ... */
    // Top right corner
    arcTo(
        left = areaWidth - ((cornerRadius * 2f) + (borderWidth / 2f)),
        top = borderWidth / 2f,
        right = areaWidth - (borderWidth / 2f),
        bottom = (cornerRadius * 2f) + (borderWidth / 2f),
        startAngle = 270f,
        sweepAngle = 90f,
        forceMoveTo = false
    )
    /* ... */
}