草の渦

wwww.kt

import kotlin.math.*

const val size = 15
const val interval = 3

fun main(args: Array<String>) {
    val center = Point(size / 2, size / 2)
    repeat(size) { y ->
        repeat(size) { x ->
            val distance = Point(x, y).distance(center)
            val angle = Point(x, y).angle(center)
            val gap = interval * angle
            if ((distance - gap).roundToInt() % interval == 0) {
                print(":wwww:")
            } else {
                print(arrayListOf(":celery:", ":mizuna:", ":komatsuna:", ":hourensou:").shuffled().first())
            }
        }
        print("\n")
    }
}

data class Point(val x: Int, val y: Int) {
    // 💩 : 0度->360度を0->1で無理やり表す
    fun angle(from: Point) = (atan2((x - from.x).toDouble(), (y - from.y).toDouble()) / PI + 1) / 2
    fun distance(from: Point) = sqrt((x - from.x).toDouble().pow(2) + (y - from.y).toDouble().pow(2))
}