231 lines
7.2 KiB
TypeScript
231 lines
7.2 KiB
TypeScript
"use client";
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import { useThemeMode } from '@/hooks/useThemeMode'
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import { useEffect, useRef } from "react";
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const STAR_TONES = [255, 210, 160, 110, 65];
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const WAVE_TONES = [55, 90, 125, 165, 205];
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const WAVE_CONFIGS = [
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{ amp: 26, freq: 0.011, speed: 0.35, phase: 0.0, yBase: 0.38, width: 1.6, toneIdx: 0 },
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{ amp: 20, freq: 0.015, speed: 0.50, phase: 1.3, yBase: 0.52, width: 1.8, toneIdx: 1 },
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{ amp: 30, freq: 0.008, speed: 0.28, phase: 2.6, yBase: 0.63, width: 2.2, toneIdx: 2 },
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{ amp: 16, freq: 0.019, speed: 0.65, phase: 0.8, yBase: 0.74, width: 2.0, toneIdx: 3 },
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{ amp: 22, freq: 0.013, speed: 0.42, phase: 3.2, yBase: 0.85, width: 2.6, toneIdx: 4 },
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];
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interface Star {
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x: number; y: number; r: number;
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v: number; baseAlpha: number;
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phase: number; twinkleSpeed: number;
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vx: number; vy: number;
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}
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interface Wave {
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amp: number; freq: number; speed: number;
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phase: number; yBase: number; width: number;
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v: number;
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}
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function initStars(W: number, H: number): Star[] {
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return Array.from({ length: 180 }, () => {
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const toneIdx = Math.floor(Math.random() * STAR_TONES.length);
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return {
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x: Math.random() * W,
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y: Math.random() * H,
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r: 0.4 + Math.random() * 1.6,
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v: STAR_TONES[toneIdx],
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baseAlpha: 0.5 + toneIdx * 0.1,
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phase: Math.random() * Math.PI * 2,
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twinkleSpeed: 0.8 + Math.random() * 2.0,
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vx: (Math.random() - 0.5) * 0.3,
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vy: (Math.random() - 0.5) * 0.15,
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};
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});
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}
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function initWaves(): Wave[] {
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return WAVE_CONFIGS.map(c => ({ ...c, v: WAVE_TONES[c.toneIdx] }));
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}
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function drawStars(ctx: CanvasRenderingContext2D, stars: Star[], W: number, H: number, ga: number) {
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const now = Date.now() / 1000;
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for (const s of stars) {
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s.x += s.vx; s.y += s.vy;
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if (s.x < 0) s.x = W; if (s.x > W) s.x = 0;
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if (s.y < 0) s.y = H; if (s.y > H) s.y = 0;
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const twinkle = 0.35 + 0.65 * ((Math.sin(now * s.twinkleSpeed + s.phase) + 1) / 2);
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ctx.beginPath();
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ctx.arc(s.x, s.y, s.r, 0, Math.PI * 2);
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ctx.fillStyle = `rgba(${s.v},${s.v},${s.v},${s.baseAlpha * twinkle * ga})`;
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ctx.fill();
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}
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}
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function buildWavePts(w: Wave, W: number, H: number, now: number) {
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const pts: { x: number; y: number }[] = [];
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for (let x = 0; x <= W; x += 8) {
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pts.push({ x, y: H * w.yBase + Math.sin(x * w.freq + w.phase + now * w.speed) * w.amp });
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}
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return pts;
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}
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function drawWavePath(ctx: CanvasRenderingContext2D, pts: { x: number; y: number }[], W: number, H: number) {
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ctx.beginPath();
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ctx.moveTo(pts[0].x, pts[0].y);
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for (let i = 0; i < pts.length - 1; i++) {
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const mx = (pts[i].x + pts[i + 1].x) / 2;
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const my = (pts[i].y + pts[i + 1].y) / 2;
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ctx.quadraticCurveTo(pts[i].x, pts[i].y, mx, my);
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}
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ctx.lineTo(pts[pts.length - 1].x, pts[pts.length - 1].y);
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}
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function drawWaves(ctx: CanvasRenderingContext2D, waves: Wave[], W: number, H: number, ga: number, bgR: number) {
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const now = Date.now() / 1000;
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const bg = Math.round(bgR);
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for (const w of waves) {
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const v = w.v;
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const yBase = H * w.yBase;
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const pts = buildWavePts(w, W, H, now);
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const grad = ctx.createLinearGradient(0, yBase - w.amp, 0, yBase + w.amp * 3);
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grad.addColorStop(0, `rgba(${v},${v},${v},${0.030 * ga})`);
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grad.addColorStop(0.4, `rgba(${v},${v},${v},${0.012 * ga})`);
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grad.addColorStop(1, `rgba(${bg},${bg},${bg},0)`);
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drawWavePath(ctx, pts, W, H);
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ctx.lineTo(W, H); ctx.lineTo(0, H); ctx.closePath();
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ctx.fillStyle = grad;
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ctx.fill();
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drawWavePath(ctx, pts, W, H);
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ctx.strokeStyle = `rgba(${v},${v},${v},${0.85 * ga})`;
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ctx.lineWidth = w.width;
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ctx.lineJoin = "round";
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ctx.lineCap = "round";
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ctx.stroke();
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}
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}
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// ── Component ────────────────────────────────────────────────────────────────
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interface HeroBackgroundProps {
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/** Controlled from outside if you have a global theme toggle. */
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isDark?: boolean;
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/** Fires when the internal toggle is clicked (omit to hide the button). */
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onToggle?: (isDark: boolean) => void;
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/** Show the built-in toggle button. Defaults to true. */
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showToggle?: boolean;
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}
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export default function HeroBackground({
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isDark: externalIsDark,
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onToggle,
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showToggle = true,
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}: HeroBackgroundProps) {
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const canvasRef = useRef<HTMLCanvasElement>(null);
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// REPLACE WITH:
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const { isDark: hookDark, toggle } = useThemeMode();
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// Use external control if provided, otherwise hook
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const isDark = externalIsDark !== undefined ? externalIsDark : hookDark;
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// REPLACE WITH:
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function handleToggle() {
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toggle();
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onToggle?.(!isDark);
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}
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useEffect(() => {
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const canvas = canvasRef.current;
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if (!canvas) return;
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const ctx = canvas.getContext("2d");
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if (!ctx) return;
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let W = 0, H = 0;
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let stars: Star[] = [];
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let waves: Wave[] = [];
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let rafId: number;
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// Animated bg colour
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let bgR = 0, bgG = 0, bgB = 0;
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let crossfade = 0;
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function resize() {
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W = canvas!.width = canvas!.offsetWidth;
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H = canvas!.height = canvas!.offsetHeight;
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stars = initStars(W, H);
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waves = initWaves();
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}
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function loop() {
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// Read current target from closure — updated via ref below
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const dark = darkRef.current;
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const targetBg = dark ? 0 : 255;
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const targetCross = dark ? 0 : 1;
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bgR += (targetBg - bgR) * 0.04;
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bgG += (targetBg - bgG) * 0.04;
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bgB += (targetBg - bgB) * 0.04;
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crossfade += (targetCross - crossfade) * 0.03;
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ctx!.fillStyle = `rgb(${Math.round(bgR)},${Math.round(bgG)},${Math.round(bgB)})`;
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ctx!.fillRect(0, 0, W, H);
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const sa = 1 - crossfade;
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const wa = crossfade;
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if (sa > 0.01) drawStars(ctx!, stars, W, H, sa);
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if (wa > 0.01) drawWaves(ctx!, waves, W, H, wa, bgR);
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rafId = requestAnimationFrame(loop);
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}
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const ro = new ResizeObserver(resize);
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ro.observe(canvas);
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resize();
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rafId = requestAnimationFrame(loop);
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return () => {
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cancelAnimationFrame(rafId);
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ro.disconnect();
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};
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}, []);
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// Keep a ref so the loop closure always reads the latest isDark
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const darkRef = useRef(isDark);
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useEffect(() => { darkRef.current = isDark; }, [isDark]);
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return (
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<div style={{ position: "relative", width: "100%", height: "100%" }}>
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<canvas
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ref={canvasRef}
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style={{ display: "block", width: "100%", height: "100%" }}
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/>
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{showToggle && (
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<button
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onClick={handleToggle}
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style={{
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position: "absolute",
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top: 20,
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right: 20,
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display: "flex",
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alignItems: "center",
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gap: 8,
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padding: "8px 16px",
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fontSize: 13,
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cursor: "pointer",
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borderRadius: 999,
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border: `1px solid ${isDark ? "rgba(255,255,255,0.2)" : "rgba(0,0,0,0.18)"}`,
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background: isDark ? "rgba(255,255,255,0.08)" : "rgba(0,0,0,0.07)",
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color: isDark ? "#fff" : "#111",
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transition: "background 0.4s, color 0.4s, border-color 0.4s",
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}}
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>
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{isDark ? "☀" : "☾"} {isDark ? "Light mode" : "Dark mode"}
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</button>
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)}
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</div>
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);
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}
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