From b5574e33fa07566b65e38cd6837658ec1aaac084 Mon Sep 17 00:00:00 2001
From: HyperOnion <>
Date: Wed, 28 Jun 2023 14:35:07 +0200
Subject: [PATCH] improve grass growth.

grass now checks all adjacent tiles when attempting to grow.
---
 js/tile_update.mjs  | 17 +++++++++++------
 js/utils/random.mjs | 10 ++++++++++
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/js/tile_update.mjs b/js/tile_update.mjs
index 8cbfd44..1b9ba76 100644
--- a/js/tile_update.mjs
+++ b/js/tile_update.mjs
@@ -26,13 +26,18 @@ const dirs = [
 
 tile_tickers.set("grass", (box, x, y, delta_time) => {
 	const tile = world.get_tile(box, x, y);
-	if (Math.random() > 0.9 ** delta_time) {
+	if (Math.random() > 0.8 ** delta_time) {
 		const dir = random.item(dirs);
-		const [ d_x, d_y ] = dir;
-		if (world.get_tile(box, x + d_x, y + d_y).type === "empty") {
-			world.set_tile(box, x + d_x, y + d_y, {
-				type: "grass",
-			});
+		const spaces = random.shuffle(dirs)
+			.map(([d_x, d_y]) => [x + d_x, y + d_y]);
+
+		for (const [new_x, new_y] of spaces) {
+			if (world.get_tile(box, new_x, new_y).type === "empty") {
+				world.set_tile(box, new_x, new_y, {
+					type: "grass",
+				});
+				break;
+			}
 		}
 	};
 });
diff --git a/js/utils/random.mjs b/js/utils/random.mjs
index 1143e30..1f629e8 100644
--- a/js/utils/random.mjs
+++ b/js/utils/random.mjs
@@ -9,3 +9,13 @@ export function integer (min, max) {
 export function item (array) {
 	return array[integer(0, array.length)];
 }
+
+export function shuffle (array) {
+	const copy = [ ...array ];
+	const result = [];
+	while (copy.length > 0) {
+		const index = integer(0, copy.length);
+		result.push(copy.splice(index, 1)[0]);
+	}
+	return result;
+}