Wavy Background

A cool background effect with waves that move.

Hero waves are cool

Leverage the power of canvas to create a beautiful hero section

Installation

Install dependencies

npm i motion clsx tailwind-merge simplex-noise

Add util file

lib/utils.ts

import { ClassValue, clsx } from "clsx";
import { twMerge } from "tailwind-merge";
 
export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

Copy the source code

components/ui/wavy-background.tsx

"use client";
import { cn } from "@/lib/utils";
import React, { useEffect, useRef, useState } from "react";
import { createNoise3D } from "simplex-noise";
 
export const WavyBackground = ({
  children,
  className,
  containerClassName,
  colors,
  waveWidth,
  backgroundFill,
  blur = 10,
  speed = "fast",
  waveOpacity = 0.5,
  ...props
}: {
  children?: any;
  className?: string;
  containerClassName?: string;
  colors?: string[];
  waveWidth?: number;
  backgroundFill?: string;
  blur?: number;
  speed?: "slow" | "fast";
  waveOpacity?: number;
  [key: string]: any;
}) => {
  const noise = createNoise3D();
  let w: number,
    h: number,
    nt: number,
    i: number,
    x: number,
    ctx: any,
    canvas: any;
  const canvasRef = useRef<HTMLCanvasElement>(null);
  const getSpeed = () => {
    switch (speed) {
      case "slow":
        return 0.001;
      case "fast":
        return 0.002;
      default:
        return 0.001;
    }
  };
 
  const init = () => {
    canvas = canvasRef.current;
    ctx = canvas.getContext("2d");
    w = ctx.canvas.width = window.innerWidth;
    h = ctx.canvas.height = window.innerHeight;
    ctx.filter = `blur(${blur}px)`;
    nt = 0;
    window.onresize = function () {
      w = ctx.canvas.width = window.innerWidth;
      h = ctx.canvas.height = window.innerHeight;
      ctx.filter = `blur(${blur}px)`;
    };
    render();
  };
 
  const waveColors = colors ?? [
    "#38bdf8",
    "#818cf8",
    "#c084fc",
    "#e879f9",
    "#22d3ee",
  ];
  const drawWave = (n: number) => {
    nt += getSpeed();
    for (i = 0; i < n; i++) {
      ctx.beginPath();
      ctx.lineWidth = waveWidth || 50;
      ctx.strokeStyle = waveColors[i % waveColors.length];
      for (x = 0; x < w; x += 5) {
        var y = noise(x / 800, 0.3 * i, nt) * 100;
        ctx.lineTo(x, y + h * 0.5); // adjust for height, currently at 50% of the container
      }
      ctx.stroke();
      ctx.closePath();
    }
  };
 
  let animationId: number;
  const render = () => {
    ctx.fillStyle = backgroundFill || "black";
    ctx.globalAlpha = waveOpacity || 0.5;
    ctx.fillRect(0, 0, w, h);
    drawWave(5);
    animationId = requestAnimationFrame(render);
  };
 
  useEffect(() => {
    init();
    return () => {
      cancelAnimationFrame(animationId);
    };
  }, []);
 
  const [isSafari, setIsSafari] = useState(false);
  useEffect(() => {
    // I'm sorry but i have got to support it on safari.
    setIsSafari(
      typeof window !== "undefined" &&
        navigator.userAgent.includes("Safari") &&
        !navigator.userAgent.includes("Chrome")
    );
  }, []);
 
  return (
    <div
      className={cn(
        "h-screen flex flex-col items-center justify-center",
        containerClassName
      )}
    >
      <canvas
        className="absolute inset-0 z-0"
        ref={canvasRef}
        id="canvas"
        style={{
          ...(isSafari ? { filter: `blur(${blur}px)` } : {}),
        }}
      ></canvas>
      <div className={cn("relative z-10", className)} {...props}>
        {children}
      </div>
    </div>
  );
};

Prop	Type	Default	Description
`children`	`any`	-	The content to be displayed on top of the wavy background.
`className`	`string`	-	The CSS class to apply to the content container.
`containerClassName`	`string`	-	The CSS class to apply to the main container.
`colors`	`string[]`	["#38bdf8", "#818cf8", "#c084fc", "#e879f9", "#22d3ee"]	The colors of the waves.
`waveWidth`	`number`	50	The width of the waves.
`backgroundFill`	`string`	"black"	The background color.
`blur`	`number`	10	The blur effect applied to the waves.
`speed`	`"slow" \| "fast"`	"fast"	The speed of the wave animation.
`waveOpacity`	`number`	0.5	The opacity of the waves.
`[key: string]`	`any`	-	Any other props not listed above.

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