Flexible at Scale Illustration

1'use client'
2 
3import type { PointerEvent } from 'react'
4import {
5  motion,
6  useMotionValue,
7  useReducedMotion,
8  useSpring,
9  useTransform,
10  type MotionValue,
11} from 'motion/react'
12 
13const clamp = (value: number, min: number, max: number) => Math.min(Math.max(value, min), max)
14 
15const FLEXIBLE_LINE_COUNT = 17
16 
17const flexibleLines = Array.from({ length: FLEXIBLE_LINE_COUNT }, (_, index) => {
18  const progress = index / (FLEXIBLE_LINE_COUNT - 1)
19 
20  // outer lines away from the illustration edges.
21  return 0.04 + progress * 0.92
22})
23 
24type FlexibleLineProps = {
25  position: number
26  pointerX: MotionValue<number>
27  interaction: MotionValue<number>
28  reduceMotion: boolean
29}
30 
31function FlexibleLine({ position, pointerX, interaction, reduceMotion }: FlexibleLineProps) {
32  const influence = useTransform(() => {
33    if (reduceMotion) return 0
34 
35    const distance = pointerX.get() - position
36    const influenceRadius = 0.17
37 
38    return Math.exp(-Math.pow(distance / influenceRadius, 2))
39  })
40 
41  const left = useTransform(() => {
42    if (reduceMotion) {
43      return `${position * 100}%`
44    }
45 
46    const pointer = pointerX.get()
47    const amount = interaction.get()
48    const distance = pointer - position
49    const strength = influence.get()
50 
51    const flexiblePosition = position + distance * strength * amount * 0.88
52 
53    return `${clamp(flexiblePosition, 0.02, 0.98) * 100}%`
54  })
55 
56  const opacity = useTransform(() => {
57    if (reduceMotion) return 0.24
58 
59    const amount = interaction.get()
60    const strength = influence.get()
61 
62    return 0.2 + amount * (0.08 + strength * 0.72)
63  })
64 
65  const scaleY = useTransform(() => {
66    if (reduceMotion) return 1
67 
68    return 1 + interaction.get() * influence.get() * 0.16
69  })
70 
71  const scaleX = useTransform(() => {
72    if (reduceMotion) return 1
73 
74    return 1 + interaction.get() * influence.get() * 0.65
75  })
76 
77  return (
78    <motion.span
79      className="absolute inset-y-[16%] w-px origin-center bg-foreground"
80      style={{
81        left,
82        x: '-50%',
83        opacity,
84        scaleX,
85        scaleY,
86      }}
87    />
88  )
89}
90 
91export function FlexibleAtScaleIllustration() {
92  const reduceMotion = useReducedMotion() ?? false
93 
94  const rawPointerX = useMotionValue(0.5)
95  const rawInteraction = useMotionValue(0)
96 
97  const pointerX = useSpring(rawPointerX, {
98    stiffness: 280,
99    damping: 30,
100    mass: 0.35,
101  })
102 
103  const interaction = useSpring(rawInteraction, {
104    stiffness: 220,
105    damping: 24,
106    mass: 0.4,
107  })
108 
109// … truncated