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Morphing Text

Morphing Text is a React and Tailwind CSS text component from Magic UI, licensed MIT. Copy it and paste it into your project.

Magic UI MIT text

What it is

Morphing Text is a React and Tailwind CSS text component from Magic UI, licensed MIT. Copy it and paste it into your project.

How to use it

Open it in the catalogue, press copy, and paste it into your project. The prompt you copy carries the code and the rules that tell your agent to reproduce it without changing anything.

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Licence

This component comes from Magic UI and is redistributed under the MIT licence, which permits commercial use. The copyright notice travels with the code.

Morphing Text

registry/magicui/morphing-text.tsx
"use client"

import { useCallback, useEffect, useRef } from "react"

import { cn } from "@/lib/utils"

const morphTime = 1.5
const cooldownTime = 0.5

const useMorphingText = (texts: string[]) => {
  const textIndexRef = useRef(0)
  const morphRef = useRef(0)
  const cooldownRef = useRef(0)
  const timeRef = useRef(new Date())

  const text1Ref = useRef<HTMLSpanElement>(null)
  const text2Ref = useRef<HTMLSpanElement>(null)

  const setStyles = useCallback(
    (fraction: number) => {
      const [current1, current2] = [text1Ref.current, text2Ref.current]
      if (!current1 || !current2) return

      current2.style.filter = `blur(${Math.min(8 / fraction - 8, 100)}px)`
      current2.style.opacity = `${Math.pow(fraction, 0.4) * 100}%`

      const invertedFraction = 1 - fraction
      current1.style.filter = `blur(${Math.min(
        8 / invertedFraction - 8,
        100
      )}px)`
      current1.style.opacity = `${Math.pow(invertedFraction, 0.4) * 100}%`

      current1.textContent = texts[textIndexRef.current % texts.length]
      current2.textContent = texts[(textIndexRef.current + 1) % texts.length]
    },
    [texts]
  )

  const doMorph = useCallback(() => {
    morphRef.current -= cooldownRef.current
    cooldownRef.current = 0

    let fraction = morphRef.current / morphTime

    if (fraction > 1) {
      cooldownRef.current = cooldownTime
      fraction = 1
    }

    setStyles(fraction)

    if (fraction === 1) {
      textIndexRef.current++
    }
  }, [setStyles])

  const doCooldown = useCallback(() => {
    morphRef.current = 0
    const [current1, current2] = [text1Ref.current, text2Ref.current]
    if (current1 && current2) {
      current2.style.filter = "none"
      current2.style.opacity = "100%"
      current1.style.filter = "none"
      current1.style.opacity = "0%"
    }
  }, [])

  useEffect(() => {
    let animationFrameId: number

    const animate = () => {
      animationFrameId = requestAnimationFrame(animate)

      const newTime = new Date()
      const dt = (newTime.getTime() - timeRef.current.getTime()) / 1000
      timeRef.current = newTime

      cooldownRef.current -= dt

      if (cooldownRef.current <= 0) doMorph()
      else doCooldown()
    }

    animate()
    return () => {
      cancelAnimationFrame(animationFrameId)
    }
  }, [doMorph, doCooldown])

  return { text1Ref, text2Ref }
}

interface MorphingTextProps {
  className?: string
  texts: string[]
}

const Texts: React.FC<Pick<MorphingTextProps, "texts">> = ({ texts }) => {
  const { text1Ref, text2Ref } = useMorphingText(texts)
  return (
    <>
      <span
        className="absolute inset-x-0 top-0 m-auto inline-block w-full"
        ref={text1Ref}
      />
      <span
        className="absolute inset-x-0 top-0 m-auto inline-block w-full"
        ref={text2Ref}
      />
    </>
  )
}

const SvgFilters: React.FC = () => (
  <svg
    id="filters"
    className="fixed h-0 w-0"
    preserveAspectRatio="xMidYMid slice"
  >
    <defs>
      <filter id="threshold">
        <feColorMatrix
          in="SourceGraphic"
          type="matrix"
          values="1 0 0 0 0
                  0 1 0 0 0
                  0 0 1 0 0
                  0 0 0 255 -140"
        />
      </filter>
    </defs>
  </svg>
)

export const MorphingText: React.FC<MorphingTextProps> = ({
  texts,
  className,
}) => (
  <div
    className={cn(
      "relative mx-auto h-16 w-full max-w-3xl text-center font-sans text-[40pt] leading-none font-bold filter-[url(#threshold)_blur(0.6px)] md:h-24 lg:text-[6rem]",
      className
    )}
  >
    <Texts texts={texts} />
    <SvgFilters />
  </div>
)

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