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97 lines
3.0 KiB
TypeScript
97 lines
3.0 KiB
TypeScript
import type { CSSProperties } from "react";
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import { buildVoronoiMesh, type VoronoiCell } from "@/lib/voronoi-mesh";
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import { cn } from "@/lib/utils";
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/** Wider mesh plane — pairs with slice scaling so pebbles are not horizontally stretched. */
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const MESH_W = 140;
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const MESH_H = 100;
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/** Narrow green range — low contrast between “stones” on section backgrounds */
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const ROCK_TONES = ["#1a5c38", "#1d5f3c", "#216342", "#246845", "#286a48", "#2b6e4b"] as const;
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const GROUT = "rgba(8, 38, 22, 0.2)";
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const ROCK_MESH = buildVoronoiMesh(42, MESH_W, MESH_H, 0x475256, {
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siteGenerator: "poisson",
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});
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function hexToRgb(hex: string) {
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const n = parseInt(hex.slice(1), 16);
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return { r: (n >> 16) & 255, g: (n >> 8) & 255, b: n & 255 };
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}
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function mixHex(a: string, b: string, t: number) {
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const c1 = hexToRgb(a);
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const c2 = hexToRgb(b);
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const u = (v: number) => Math.round(v).toString(16).padStart(2, "0");
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return `#${u(c1.r + (c2.r - c1.r) * t)}${u(c1.g + (c2.g - c1.g) * t)}${u(c1.b + (c2.b - c1.b) * t)}`;
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}
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function rockFill(cell: VoronoiCell, index: number) {
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const cx = cell.points.reduce((s, p) => s + p[0], 0) / cell.points.length;
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const cy = cell.points.reduce((s, p) => s + p[1], 0) / cell.points.length;
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const yNorm = cy / MESH_H;
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const gradient = mixHex("#2a6f4a", "#1a5c38", Math.min(1, yNorm * 0.45 + 0.25));
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const tone = ROCK_TONES[(index * 11 + Math.floor(cx * 0.55)) % ROCK_TONES.length];
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return mixHex(gradient, tone, 0.38);
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}
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type Props = {
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className?: string;
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style?: CSSProperties;
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/** Slight vertical wash (two-days section). */
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gradient?: boolean;
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};
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export function RoundedRockVoronoiBackground({
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className,
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style,
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gradient = false,
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}: Props) {
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const cells = ROCK_MESH.map((cell, i) => ({
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d: cell.d,
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fill: rockFill(cell, i),
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}));
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return (
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<div
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className={cn(
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"pointer-events-none absolute overflow-hidden bg-[#1a5c38]",
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style?.height != null ? "left-0 right-0" : "inset-0",
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className
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)}
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style={style}
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aria-hidden
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>
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<svg
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className="absolute left-1/2 top-1/2 h-full w-full min-h-full min-w-full -translate-x-1/2 -translate-y-1/2"
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viewBox={`0 0 ${MESH_W} ${MESH_H}`}
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preserveAspectRatio="xMidYMid slice"
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xmlns="http://www.w3.org/2000/svg"
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>
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{cells.map((cell, i) => (
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<path
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key={i}
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d={cell.d}
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fill={cell.fill}
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stroke={GROUT}
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strokeWidth={0.5}
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strokeLinejoin="round"
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strokeLinecap="round"
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/>
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))}
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</svg>
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<div className="absolute inset-0 opacity-[0.18] grain" aria-hidden />
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{gradient && (
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<div
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className="absolute inset-0 bg-gradient-to-b from-[#2a6f4a]/8 via-transparent to-[#0d3d26]/10"
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aria-hidden
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/>
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)}
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<div
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className="absolute inset-0 bg-[radial-gradient(ellipse_85%_60%_at_20%_15%,rgba(13,61,38,0.1),transparent_65%)]"
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aria-hidden
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/>
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</div>
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);
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}
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