feat(dataroom): dot grid animation

src/components/DataRoom/IndustryComparison/Content.tsx

@@ -25,7 +25,7 @@ const Content = ({ containerRef, title }: { containerRef: RefObject<HTMLDivEleme
       <Typography align="center" variant="h1">
         {title}
       </Typography>
-      <DotGrid containerRef={containerRef} />
+      <DotGrid containerRef={containerRef} scrollYProgress={scrollYProgress} />
     </motion.div>
   )
 }

src/components/DataRoom/IndustryComparison/DotGrid.tsx

@@ -1,17 +1,26 @@
+import type { MotionValue } from 'framer-motion'
 import { useEffect, useRef, useCallback } from 'react'
 import { createDots } from './utils/createDots'
 import { drawDots } from './utils/drawDots'
 import { useIsMediumScreen } from '@/hooks/useMaxWidth'
 import css from './styles.module.css'
 import useContainerSize from '@/hooks/useContainerSize'
 import { updateCanvas } from './utils/updateCanvas'
-
-export default function DotGrid({ containerRef }: { containerRef: React.RefObject<HTMLDivElement> }) {
+import useMousePosition from './utils/useMousePosition'
+
+export default function DotGrid({
+  containerRef,
+  scrollYProgress,
+}: {
+  containerRef: React.RefObject<HTMLDivElement>
+  scrollYProgress?: MotionValue<number>
+}) {
   const canvasRef = useRef<HTMLCanvasElement>(null)
   const isMobile = useIsMediumScreen()
   const dimensions = useContainerSize(containerRef)
+  const mousePosition = useMousePosition(canvasRef, dimensions, scrollYProgress)
 
-  const prevRenderStateRef = useRef({ dimensions })
+  const prevRenderStateRef = useRef({ dimensions, mousePosition, isMobile })
   const dotsRef = useRef<ReturnType<typeof createDots> | null>(null)
   const animationFrameId = useRef<number>()
 
@@ -20,21 +29,27 @@ export default function DotGrid({ containerRef }: { containerRef: React.RefObjec
     const ctx = canvas?.getContext('2d')
     if (!canvas || !ctx || dimensions.width <= 0 || dimensions.height <= 0) return
 
-    const currentRenderState = { dimensions }
+    const currentRenderState = { dimensions, mousePosition, isMobile }
     const prevRenderState = prevRenderStateRef.current
 
-    if (!dotsRef.current || currentRenderState.dimensions !== prevRenderState.dimensions) {
+    if (
+      !dotsRef.current ||
+      currentRenderState.dimensions !== prevRenderState.dimensions ||
+      currentRenderState.isMobile !== prevRenderState.isMobile
+    ) {
       dotsRef.current = createDots(dimensions, isMobile)
       updateCanvas(canvas, ctx, dimensions.width, dimensions.height)
       // Draw dots immediately after creating or updating them
       // This draw call ensure dots are already visible when canvas scrolls into view
-      drawDots(ctx, dotsRef.current)
+      drawDots(ctx, dotsRef.current, mousePosition, isMobile)
+    } else if (currentRenderState.mousePosition !== prevRenderState.mousePosition) {
+      drawDots(ctx, dotsRef.current, mousePosition, isMobile)
     }
 
     prevRenderStateRef.current = currentRenderState
 
     animationFrameId.current = requestAnimationFrame(renderFrame)
-  }, [dimensions, isMobile])
+  }, [dimensions, mousePosition, isMobile])
 
   useEffect(() => {
     renderFrame()

src/components/DataRoom/IndustryComparison/utils/drawDots.ts

@@ -1,12 +1,52 @@
 type Position = { x: number; y: number }
 
-const DOT_COLOR = '#12312'
+const MAX_SCALE_DISTANCE = 15
+const MOBILE_MAX_SCALE = 8
+const DESKTOP_MAX_SCALE = 12
+const DOT_COLOR = '#121312'
+
+let lastUpdatedArea: { x: number; y: number; radius: number } | null = null
+
+export const drawDots = (
+  ctx: CanvasRenderingContext2D,
+  dots: Position[],
+  mousePosition: Position,
+  isMobile: boolean,
+) => {
+  const maxScale = isMobile ? MOBILE_MAX_SCALE : DESKTOP_MAX_SCALE
+  const updatedRadius = MAX_SCALE_DISTANCE * maxScale
+
+  // Clear the previously updated area
+  if (lastUpdatedArea) {
+    ctx.clearRect(
+      lastUpdatedArea.x - lastUpdatedArea.radius,
+      lastUpdatedArea.y - lastUpdatedArea.radius,
+      lastUpdatedArea.radius * 2,
+      lastUpdatedArea.radius * 2,
+    )
+  }
+  // Clear the new (to be updated) area
+  ctx.clearRect(mousePosition.x - updatedRadius, mousePosition.y - updatedRadius, updatedRadius * 2, updatedRadius * 2)
 
-export const drawDots = (ctx: CanvasRenderingContext2D, dots: Position[]) => {
   ctx.fillStyle = DOT_COLOR
+
   dots.forEach((dot) => {
-    ctx.beginPath()
-    ctx.arc(dot.x, dot.y, 1, 0, 2 * Math.PI)
-    ctx.fill()
+    const dx = mousePosition.x - dot.x
+    const dy = mousePosition.y - dot.y
+    const distance = Math.sqrt(dx * dx + dy * dy)
+
+    if (distance <= updatedRadius) {
+      const scale = Math.max(1, maxScale - distance / MAX_SCALE_DISTANCE)
+      ctx.beginPath()
+      ctx.arc(dot.x, dot.y, 1 * scale, 0, 2 * Math.PI)
+      ctx.fill()
+    } else {
+      // Draw unupdated dots with normal size
+      ctx.beginPath()
+      ctx.arc(dot.x, dot.y, 1, 0, 2 * Math.PI)
+      ctx.fill()
+    }
   })
+
+  lastUpdatedArea = { x: mousePosition.x, y: mousePosition.y, radius: updatedRadius }
 }

src/components/DataRoom/IndustryComparison/utils/useMousePosition.ts

@@ -0,0 +1,43 @@
+import { useState, useEffect } from 'react'
+import type { MotionValue } from 'framer-motion'
+import { useIsMediumScreen } from '@/hooks/useMaxWidth'
+
+/**
+ * Custom hook to track mouse position or simulate it based on scroll progress.
+ * @param canvasRef - Reference to the canvas element.
+ * @param dimensions - Object containing width and height of the container.
+ * @param scrollYProgress - MotionValue for scroll progress, used on mobile devices.
+ * @returns An object with x and y coordinates representing either:
+ *          - Actual mouse position relative to the canvas (on desktop)
+ *          - Simulated position based on scroll progress (on mobile)
+ */
+export default function useMousePosition(
+  canvasRef: React.RefObject<HTMLCanvasElement>,
+  dimensions: { width: number; height: number },
+  scrollYProgress?: MotionValue<number>,
+) {
+  const isMobile = useIsMediumScreen()
+  const [mousePosition, setMousePosition] = useState({ x: 0, y: 0 })
+
+  useEffect(() => {
+    if (isMobile && scrollYProgress) {
+      const updatePositionMobile = () => {
+        const progress = scrollYProgress.get()
+        setMousePosition({ x: dimensions.width - dimensions.width / 8, y: progress * dimensions.height })
+      }
+      return scrollYProgress.on('change', updatePositionMobile)
+    } else {
+      const canvas = canvasRef.current
+      const updatePositionDesktop = (e: MouseEvent) => {
+        const rect = canvas?.getBoundingClientRect()
+        if (rect) {
+          setMousePosition({ x: e.clientX - rect.left, y: e.clientY - rect.top })
+        }
+      }
+      canvas?.addEventListener('mousemove', updatePositionDesktop)
+      return () => canvas?.removeEventListener('mousemove', updatePositionDesktop)
+    }
+  }, [canvasRef, isMobile, scrollYProgress, dimensions])
+
+  return mousePosition
+}