1 files changed, 115 insertions, 0 deletions
diff --git a/tools/adjacent.js b/tools/adjacent.js
new file mode 100644
index 0000000..c932aba
--- /dev/null
+++ b/tools/adjacent.js
@@ -0,0 +1,115 @@
+"use strict"
+
+function set_has(set, item) {
+	let a = 0
+	let b = set.length - 1
+	while (a <= b) {
+		let m = (a + b) >> 1
+		let x = set[m]
+		if (item < x)
+			b = m - 1
+		else if (item > x)
+			a = m + 1
+		else
+			return true
+	}
+	return false
+}
+
+function set_add(set, item) {
+	let a = 0
+	let b = set.length - 1
+	while (a <= b) {
+		let m = (a + b) >> 1
+		let x = set[m]
+		if (item < x)
+			b = m - 1
+		else if (item > x)
+			a = m + 1
+		else
+			return
+	}
+	array_insert(set, a, item)
+}
+
+function array_insert(array, index, item) {
+	for (let i = array.length; i > index; --i)
+		array[i] = array[i - 1]
+	array[index] = item
+}
+
+function calc_distance(a, b) {
+	let ac = a % 100
+	let bc = b % 100
+	let ay = a / 100 | 0
+	let by = b / 100 | 0
+	let ax = ac - (ay >> 1)
+	let bx = bc - (by >> 1)
+	let az = -ax - ay
+	let bz = -bx - by
+	return max(abs(bx-ax), abs(by-ay), abs(bz-az))
+}
+
+function for_each_adjacent(hex, fn) {
+	if (hex / 100 & 1) {
+		fn(hex - 100)
+		fn(hex - 99)
+		fn(hex - 1)
+		fn(hex + 1)
+		fn(hex + 100)
+		fn(hex + 101)
+	} else {
+		fn(hex - 101)
+		fn(hex - 100)
+		fn(hex - 1)
+		fn(hex + 1)
+		fn(hex + 99)
+		fn(hex + 100)
+	}
+}
+
+function search2(list, a, max) {
+	for_each_adjacent(a, (b) => {
+		set_add(list, b)
+		for_each_adjacent(b, (c) => {
+			set_add(list, c)
+			for_each_adjacent(c, (d) => {
+				set_add(list, d)
+			})
+		})
+	})
+}
+
+function search(list, start, max) {
+	let seen = [ start ]
+	let queue = [ start << 8 ]
+	while (queue.length > 0) {
+		let item = queue.shift()
+		let here = (item >> 8)
+		let cost = (item & 255) + 1
+		for_each_adjacent(here, next => {
+			if (!set_has(seen, next)) {
+				set_add(seen, next)
+				set_add(list, next)
+				if (cost < max)
+					queue.push(next << 8 | cost)
+			}
+		})
+	}
+}
+
+function mklist(search,n) {
+	let a, b
+	search(a=[], 2050, n)
+	a=a.map(x=>x-2050)
+	search(b=[], 2150, n)
+	b=b.map(x=>x-2150)
+	console.log("const ADJACENT_X" + n + " = [")
+	console.log("\t" + JSON.stringify(a) + ",")
+	console.log("\t" + JSON.stringify(b))
+	console.log("]")
+}
+
+mklist(search, 1)
+mklist(search, 2)
+mklist(search, 3)