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"use client";
import { cn } from "@/lib/utils";
import React, {
useState,
useEffect,
useRef,
RefObject,
useCallback,
} from "react";
interface StarProps {
x: number;
y: number;
radius: number;
opacity: number;
twinkleSpeed: number | null;
}
interface StarBackgroundProps {
starDensity?: number;
allStarsTwinkle?: boolean;
twinkleProbability?: number;
minTwinkleSpeed?: number;
maxTwinkleSpeed?: number;
className?: string;
}
export const StarsBackground: React.FC<StarBackgroundProps> = ({
starDensity = 0.00015,
allStarsTwinkle = true,
twinkleProbability = 0.7,
minTwinkleSpeed = 0.5,
maxTwinkleSpeed = 1,
className,
}) => {
const [stars, setStars] = useState<StarProps[]>([]);
const canvasRef: RefObject<HTMLCanvasElement> =
useRef<HTMLCanvasElement>(null);
const generateStars = useCallback(
(width: number, height: number): StarProps[] => {
const area = width * height;
const numStars = Math.floor(area * starDensity);
return Array.from({ length: numStars }, () => {
const shouldTwinkle =
allStarsTwinkle || Math.random() < twinkleProbability;
return {
x: Math.random() * width,
y: Math.random() * height,
radius: Math.random() * 0.05 + 0.5,
opacity: Math.random() * 0.5 + 0.5,
twinkleSpeed: shouldTwinkle
? minTwinkleSpeed +
Math.random() * (maxTwinkleSpeed - minTwinkleSpeed)
: null,
};
});
},
[
starDensity,
allStarsTwinkle,
twinkleProbability,
minTwinkleSpeed,
maxTwinkleSpeed,
]
);
useEffect(() => {
const updateStars = () => {
if (canvasRef.current) {
const canvas = canvasRef.current;
const ctx = canvas.getContext("2d");
if (!ctx) return;
const { width, height } = canvas.getBoundingClientRect();
canvas.width = width;
canvas.height = height;
setStars(generateStars(width, height));
}
};
updateStars();
const resizeObserver = new ResizeObserver(updateStars);
if (canvasRef.current) {
resizeObserver.observe(canvasRef.current);
}
return () => {
if (canvasRef.current) {
resizeObserver.unobserve(canvasRef.current);
}
};
}, [
starDensity,
allStarsTwinkle,
twinkleProbability,
minTwinkleSpeed,
maxTwinkleSpeed,
generateStars,
]);
useEffect(() => {
const canvas = canvasRef.current;
if (!canvas) return;
const ctx = canvas.getContext("2d");
if (!ctx) return;
let animationFrameId: number;
const render = () => {
ctx.clearRect(0, 0, canvas.width, canvas.height);
stars.forEach((star) => {
ctx.beginPath();
ctx.arc(star.x, star.y, star.radius, 0, Math.PI * 2);
ctx.fillStyle = `rgba(255, 255, 255, ${star.opacity})`;
ctx.fill();
if (star.twinkleSpeed !== null) {
star.opacity =
0.5 +
Math.abs(Math.sin((Date.now() * 0.001) / star.twinkleSpeed) * 0.5);
}
});
animationFrameId = requestAnimationFrame(render);
};
render();
return () => {
cancelAnimationFrame(animationFrameId);
};
}, [stars]);
return (
<canvas
ref={canvasRef}
className={cn("h-full w-full absolute inset-0", className)}
/>
);
};
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