Change tilemap to dimension and simple generation

client/generation.ts

@@ -0,0 +1,47 @@
+import { Alea, create_noise_2d } from "@paulaboks/rng";
+
+import { Dimension } from "./components/dimension.ts";
+
+export function generate(dimension: Dimension, width: number, height: number, seed = "seed") {
+	const height_noise = create_noise_2d(new Alea(seed + "_height"));
+	const tree_noise = create_noise_2d(new Alea(seed + "_trees"));
+
+	const scale = 0.05;
+
+	for (let y = 0; y < height; y++) {
+		for (let x = 0; x < width; x++) {
+			// multi-octave terrain
+			const nx = x * scale;
+			const ny = y * scale;
+
+			let h = height_noise(nx, ny) * 1 + height_noise(nx * 2, ny * 2) * 0.5 + height_noise(nx * 4, ny * 4) * 0.25;
+
+			h /= 1.75; // normalize
+
+			let id = "bworld:grass";
+
+			if (h < -0.25) {
+				id = "bworld:water";
+			} else if (h < -0.15) {
+				id = "bworld:sand";
+			} else {
+				id = "bworld:grass";
+			}
+
+			dimension.tiles.push({ x, y, id });
+
+			// tree placement
+			if (id === "bworld:grass") {
+				const t = tree_noise(x * 0.12, y * 0.12);
+
+				if (t > 0.65) {
+					dimension.tiles.push({
+						x,
+						y,
+						id: "bworld:tree",
+					});
+				}
+			}
+		}
+	}
+}