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Elastic Line

Elastic Line is a React and Tailwind CSS component from Fancy Components, licensed MIT. Copy it and paste it into your project.

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What it is

Elastic Line is a React and Tailwind CSS component from Fancy Components, 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.

Open in the catalogue

Five free copies a month. No card.

Needs

npm i motion

Licence

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

Elastic Line

fancy/physics/elastic-line.tsx
"use client"

import React, { useEffect, useRef, useState } from "react"
import {
  animate,
  motion,
  useAnimationFrame,
  useMotionValue,
  ValueAnimationTransition,
} from "motion/react"

import { useDimensions } from "@/hooks/use-dimensions"
import { useElasticLineEvents } from "@/hooks/use-elastic-line-events"

interface ElasticLineProps {
  isVertical?: boolean
  grabThreshold?: number
  releaseThreshold?: number
  strokeWidth?: number
  transition?: ValueAnimationTransition
  animateInTransition?: ValueAnimationTransition
  className?: string
}

const ElasticLine: React.FC<ElasticLineProps> = ({
  isVertical = false,
  grabThreshold = 5,
  releaseThreshold = 100,
  strokeWidth = 1,
  transition = {
    type: "spring",
    stiffness: 300,
    damping: 5,
  },
  animateInTransition = {
    duration: 0.3,
    ease: "easeInOut",
  },
  className,
}) => {
  const containerRef = useRef<SVGSVGElement>(null)
  const dimensions = useDimensions(containerRef)
  const pathRef = useRef<SVGPathElement>(null)
  const [hasAnimatedIn, setHasAnimatedIn] = useState(false)

  // Clamp releaseThreshold to container dimensions
  const clampedReleaseThreshold = Math.min(
    releaseThreshold,
    isVertical ? dimensions.width / 2 : dimensions.height / 2
  )

  const { isGrabbed, controlPoint } = useElasticLineEvents(
    containerRef,
    isVertical,
    grabThreshold,
    clampedReleaseThreshold
  )

  const x = useMotionValue(dimensions.width / 2)
  const y = useMotionValue(dimensions.height / 2)
  const pathLength = useMotionValue(0)

  useEffect(() => {
    // Initial draw animation
    if (!hasAnimatedIn && dimensions.width > 0 && dimensions.height > 0) {
      animate(pathLength, 1, {
        ...animateInTransition,
        onComplete: () => setHasAnimatedIn(true),
      })
    }
    x.set(dimensions.width / 2)
    y.set(dimensions.height / 2)
  }, [dimensions, hasAnimatedIn])

  useEffect(() => {
    if (!isGrabbed && hasAnimatedIn) {
      animate(x, dimensions.width / 2, transition)
      animate(y, dimensions.height / 2, transition)
    }
  }, [isGrabbed])

  useAnimationFrame(() => {
    if (isGrabbed) {
      x.set(controlPoint.x)
      y.set(controlPoint.y)
    }

    const controlX = hasAnimatedIn ? x.get() : dimensions.width / 2
    const controlY = hasAnimatedIn ? y.get() : dimensions.height / 2

    pathRef.current?.setAttribute(
      "d",
      isVertical
        ? `M${dimensions.width / 2} 0Q${controlX} ${controlY} ${
            dimensions.width / 2
          } ${dimensions.height}`
        : `M0 ${dimensions.height / 2}Q${controlX} ${controlY} ${
            dimensions.width
          } ${dimensions.height / 2}`
    )
  })

  return (
    <svg
      ref={containerRef}
      className={`w-full h-full ${className}`}
      viewBox={`0 0 ${dimensions.width} ${dimensions.height}`}
      preserveAspectRatio="none"
    >
      <motion.path
        ref={pathRef}
        stroke="currentColor"
        strokeWidth={strokeWidth}
        initial={{ pathLength: 0 }}
        style={{ pathLength }}
        fill="none"
      />
    </svg>
  )
}

export default ElasticLine

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