Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* Deterministic layout generator for grass tufts and tiny flowers
* scattered on the main island's grass cap. Purely decorative.
*
* The scatter avoids:
* - the main island's outer rim (we stay inside `MAIN_ISLAND_RADIUS - 2`),
* - every zone centre (5-unit radius guard around each zone),
* - every character slot (1-unit guard around each slot).
*
* Layout is generated once using a seeded Mulberry32 PRNG so the scene
* is reproducible across renders and tests.
*/
import { ZONES } from "../../shared/zones";
import { MAIN_ISLAND_RADIUS, ZONE_RING_RADIUS } from "./sceneConstants";
import { allSlotPositions } from "./slots";
/** A single grass tuft placement. */
export interface GrassTuftPlacement {
/** World XZ position (y is always 0 - the grass cap). */
position: [number, number];
/** Rotation around Y in radians (so tufts don't all face the same way). */
rotationY: number;
/** Height multiplier (slight per-instance variation). */
heightScale: number;
/** Index into a small green-shade palette. */
colorIndex: number;
}
/** A single flower placement. */
export interface FlowerPlacement {
/** World XZ position. */
position: [number, number];
/** Stem height. */
stemHeight: number;
/** Index into the petal-colour palette. */
colorIndex: number;
}
export interface IslandGreeneryLayout {
tufts: GrassTuftPlacement[];
flowers: FlowerPlacement[];
}
/**
* Mulberry32 - same PRNG used by `minorIslands.ts`. Small, deterministic,
* good enough spread for decorative scatter.
*/
function mulberry32(seed: number): () => number {
let state = seed >>> 0;
return () => {
state = (state + 0x6d2b79f5) >>> 0;
let t = state;
t = Math.imul(t ^ (t >>> 15), t | 1);
t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
};
}
/** Green shade palette - dark mossy to light fresh grass. */
export const GRASS_COLORS: readonly string[] = Object.freeze([
"#4d7a1f",
"#5b9a2a",
"#6b8e23",
"#7aad3a",
"#3f6a18"
]);
/** Flower palette - cheerful meadow colours. */
export const FLOWER_COLORS: readonly string[] = Object.freeze([
"#ffe066", // yellow
"#ff9ecf", // pink
"#ffffff", // white
"#c38fff" // violet
]);
export const GREENERY_SEED = 0x07a5517e;
export const DEFAULT_TUFT_COUNT = 90;
export const DEFAULT_FLOWER_COUNT = 32;
/** Inner scatter radius - stay off the immediate centre where terrain may be busy. */
export const GREENERY_INNER_RADIUS = 1.5;
/** Outer scatter radius - stay well clear of the island edge. */
export const GREENERY_OUTER_RADIUS = MAIN_ISLAND_RADIUS - 2;
/** Minimum clearance (squared distance) from each zone centre. */
const ZONE_CLEARANCE = 4.5;
/** Minimum clearance from each character slot. */
const SLOT_CLEARANCE = 1.0;
function computeZoneCenters(): Array<[number, number]> {
const n = ZONES.length;
const centers: Array<[number, number]> = [];
for (let i = 0; i < n; i++) {
const angle = (i / n) * Math.PI * 2;
centers.push([Math.cos(angle) * ZONE_RING_RADIUS, Math.sin(angle) * ZONE_RING_RADIUS]);
}
return centers;
}
/** Build a flat list of every forbidden {x,z,r} circle on the island. */
function buildExclusions(): Array<{ x: number; z: number; r: number }> {
const zoneCenters = computeZoneCenters();
const ex: Array<{ x: number; z: number; r: number }> = [];
for (const [zx, zz] of zoneCenters) {
ex.push({ x: zx, z: zz, r: ZONE_CLEARANCE });
for (const slot of allSlotPositions([zx, 0, zz])) {
ex.push({ x: slot[0], z: slot[2], r: SLOT_CLEARANCE });
}
}
return ex;
}
function isClearOf(x: number, z: number, exclusions: Array<{ x: number; z: number; r: number }>) {
for (const e of exclusions) {
const dx = x - e.x;
const dz = z - e.z;
if (dx * dx + dz * dz < e.r * e.r) return false;
}
return true;
}
export function generateIslandGreenery(
tuftCount: number = DEFAULT_TUFT_COUNT,
flowerCount: number = DEFAULT_FLOWER_COUNT,
seed: number = GREENERY_SEED
): IslandGreeneryLayout {
const rand = mulberry32(seed);
const exclusions = buildExclusions();
const innerSq = GREENERY_INNER_RADIUS * GREENERY_INNER_RADIUS;
const outerSq = GREENERY_OUTER_RADIUS * GREENERY_OUTER_RADIUS;
const samplePoint = (): [number, number] | null => {
for (let attempt = 0; attempt < 30; attempt++) {
// Uniform sample in the disc via sqrt of U for radius.
const u = rand();
const r = Math.sqrt(u * (outerSq - innerSq) + innerSq);
const theta = rand() * Math.PI * 2;
const x = Math.cos(theta) * r;
const z = Math.sin(theta) * r;
if (isClearOf(x, z, exclusions)) return [x, z];
}
return null;
};
const tufts: GrassTuftPlacement[] = [];
for (let i = 0; i < tuftCount; i++) {
const p = samplePoint();
if (!p) continue;
tufts.push({
position: p,
rotationY: rand() * Math.PI * 2,
heightScale: 0.7 + rand() * 0.6,
colorIndex: Math.floor(rand() * GRASS_COLORS.length)
});
}
const flowers: FlowerPlacement[] = [];
for (let i = 0; i < flowerCount; i++) {
const p = samplePoint();
if (!p) continue;
flowers.push({
position: p,
stemHeight: 0.22 + rand() * 0.16,
colorIndex: Math.floor(rand() * FLOWER_COLORS.length)
});
}
return { tufts, flowers };
}
/** Frozen default layout - imported directly by the renderer. */
export const ISLAND_GREENERY: Readonly<IslandGreeneryLayout> =
Object.freeze(generateIslandGreenery());
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