Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 | 'use client' import { AbacusReact, useAbacusConfig } from '@soroban/abacus-react' import { useEffect, useRef, useState } from 'react' import { css } from '../../styled-system/css' interface Flashcard { id: number number: number initialX: number initialY: number initialRotation: number zIndex: number } /** * InteractiveFlashcards - A fun flashcard display where you can drag cards around * Cards stay where you drop them - simple and intuitive */ export function InteractiveFlashcards() { const containerRef = useRef<HTMLDivElement>(null) const [cards, setCards] = useState<Flashcard[]>([]) useEffect(() => { if (!containerRef.current) return // Double rAF pattern - ensures layout is fully complete const frameId1 = requestAnimationFrame(() => { const frameId2 = requestAnimationFrame(() => { if (!containerRef.current) return const containerWidth = containerRef.current.offsetWidth const containerHeight = containerRef.current.offsetHeight // Only generate cards once we have proper dimensions if (containerWidth < 100 || containerHeight < 100) { return } const count = Math.floor(Math.random() * 8) + 8 // 8-15 cards const generated: Flashcard[] = [] // Position cards within the actual container bounds const cardWidth = 120 // approximate card width const cardHeight = 200 // approximate card height for (let i = 0; i < count; i++) { const card = { id: i, number: Math.floor(Math.random() * 900) + 100, // 100-999 initialX: Math.random() * (containerWidth - cardWidth - 40) + 20, initialY: Math.random() * (containerHeight - cardHeight - 40) + 20, initialRotation: Math.random() * 40 - 20, // -20 to 20 degrees zIndex: i, } generated.push(card) } setCards(generated) }) }) return () => { // Note: can't cancel nested rAF properly, but component cleanup will prevent state updates } }, []) return ( <div ref={containerRef} data-component="interactive-flashcards" className={css({ position: 'relative', width: '100%', maxW: '1200px', mx: 'auto', height: { base: '400px', md: '500px' }, overflow: 'visible', bg: 'rgba(0, 0, 0, 0.3)', rounded: 'xl', border: '1px solid rgba(255, 255, 255, 0.1)', zIndex: 1, // Create stacking context so child z-indexes are relative })} > {cards.map((card) => ( <DraggableCard key={card.id} card={card} containerRef={containerRef} /> ))} </div> ) } interface DraggableCardProps { card: Flashcard containerRef: React.RefObject<HTMLDivElement> } function DraggableCard({ card, containerRef }: DraggableCardProps) { const appConfig = useAbacusConfig() // Track position - starts at initial, updates when dragged const [position, setPosition] = useState({ x: card.initialX, y: card.initialY, }) const [rotation, setRotation] = useState(card.initialRotation) // Now dynamic! const [zIndex, setZIndex] = useState(card.zIndex) const [isDragging, setIsDragging] = useState(false) const [dragSpeed, setDragSpeed] = useState(0) // Speed for dynamic shadow // Track drag state const dragStartRef = useRef<{ x: number y: number cardX: number cardY: number } | null>(null) const grabOffsetRef = useRef<{ x: number; y: number }>({ x: 0, y: 0 }) // Offset from card center where grabbed const baseRotationRef = useRef(card.initialRotation) // Starting rotation const lastMoveTimeRef = useRef<number>(0) const lastMovePositionRef = useRef<{ x: number; y: number }>({ x: 0, y: 0 }) const lastLogTimeRef = useRef<number>(0) // Separate throttling for logging const cardRef = useRef<HTMLDivElement>(null) // Reference to card element const handlePointerDown = (e: React.PointerEvent) => { setIsDragging(true) setZIndex(10) // Bring to front within container stacking context setDragSpeed(0) // Capture the pointer e.currentTarget.setPointerCapture(e.pointerId) // Record where the drag started (pointer position and card position) dragStartRef.current = { x: e.clientX, y: e.clientY, cardX: position.x, cardY: position.y, } // Calculate grab offset from card center IN LOCAL COORDINATES (unrotated) if (cardRef.current) { const rect = cardRef.current.getBoundingClientRect() const cardCenterX = rect.left + rect.width / 2 const cardCenterY = rect.top + rect.height / 2 // Screen-space offset from center const screenOffsetX = e.clientX - cardCenterX const screenOffsetY = e.clientY - cardCenterY // Convert to local coordinates by rotating by -rotation const currentRotationRad = (rotation * Math.PI) / 180 const cosRot = Math.cos(-currentRotationRad) const sinRot = Math.sin(-currentRotationRad) grabOffsetRef.current = { x: screenOffsetX * cosRot - screenOffsetY * sinRot, y: screenOffsetX * sinRot + screenOffsetY * cosRot, } console.log( `[GrabPoint] Grabbed at local offset: (${grabOffsetRef.current.x.toFixed(0)}, ${grabOffsetRef.current.y.toFixed(0)})px (screen offset: ${screenOffsetX.toFixed(0)}, ${screenOffsetY.toFixed(0)}px, rotation: ${rotation.toFixed(1)}°)` ) } // Store the current rotation as the base for this drag baseRotationRef.current = rotation // Initialize velocity tracking const now = Date.now() lastMoveTimeRef.current = now lastMovePositionRef.current = { x: e.clientX, y: e.clientY } lastLogTimeRef.current = now console.log('[Shadow] Drag started, speed reset to 0') } const handlePointerMove = (e: React.PointerEvent) => { if (!isDragging || !dragStartRef.current) return // Calculate how far the pointer has moved since drag started const deltaX = e.clientX - dragStartRef.current.x const deltaY = e.clientY - dragStartRef.current.y // Calculate velocity for dynamic shadow const now = Date.now() const timeDelta = now - lastMoveTimeRef.current if (timeDelta > 0) { // Distance moved since last frame const distX = e.clientX - lastMovePositionRef.current.x const distY = e.clientY - lastMovePositionRef.current.y const distance = Math.sqrt(distX * distX + distY * distY) // Speed in pixels per millisecond, then convert to reasonable scale const speed = distance / timeDelta const scaledSpeed = Math.min(speed * 100, 100) // Cap at 100 for reasonable shadow size setDragSpeed(scaledSpeed) // Log occasionally (every ~200ms) to avoid console spam const timeSinceLastLog = now - lastLogTimeRef.current if (timeSinceLastLog > 200) { console.log( `[Shadow] Speed: ${scaledSpeed.toFixed(1)}, distance: ${distance.toFixed(0)}px, timeDelta: ${timeDelta}ms` ) lastLogTimeRef.current = now } lastMoveTimeRef.current = now lastMovePositionRef.current = { x: e.clientX, y: e.clientY } } // Calculate rotation based on grab point physics // Cross product of grab offset and drag direction determines rotation // If grabbed on left and dragged right → clockwise rotation // If grabbed on right and dragged left → counter-clockwise rotation const crossProduct = grabOffsetRef.current.x * deltaY - grabOffsetRef.current.y * deltaX const rotationInfluence = crossProduct / 500 // Reduced scale factor for more visible rotation const newRotation = baseRotationRef.current + rotationInfluence // Clamp rotation to prevent excessive spinning const clampedRotation = Math.max(-45, Math.min(45, newRotation)) setRotation(clampedRotation) // Log rotation changes occasionally (same throttle as shadow logging) const timeSinceLastLog = now - lastLogTimeRef.current if (timeSinceLastLog > 200) { console.log( `[GrabPoint] Rotation: ${clampedRotation.toFixed(1)}° (influence: ${rotationInfluence.toFixed(1)}°, cross: ${crossProduct.toFixed(0)})` ) } // Update card position - keep grab point under cursor while rotating // Calculate the rotated grab offset const rotationRad = (clampedRotation * Math.PI) / 180 const cosRot = Math.cos(rotationRad) const sinRot = Math.sin(rotationRad) // Rotate the grab offset by the current rotation angle const rotatedGrabX = grabOffsetRef.current.x * cosRot - grabOffsetRef.current.y * sinRot const rotatedGrabY = grabOffsetRef.current.x * sinRot + grabOffsetRef.current.y * cosRot // Get container bounds for coordinate conversion if (!containerRef.current || !cardRef.current) { // Fallback to simple delta if refs not ready setPosition({ x: dragStartRef.current.cardX + deltaX, y: dragStartRef.current.cardY + deltaY, }) return } const containerRect = containerRef.current.getBoundingClientRect() const cardRect = cardRef.current.getBoundingClientRect() // Current cursor position in viewport space const cursorViewportX = e.clientX const cursorViewportY = e.clientY // Card center should be at: cursor - rotated grab offset (viewport space) const cardCenterViewportX = cursorViewportX - rotatedGrabX const cardCenterViewportY = cursorViewportY - rotatedGrabY // Convert card center from viewport space to container space const cardCenterContainerX = cardCenterViewportX - containerRect.left const cardCenterContainerY = cardCenterViewportY - containerRect.top // position.x/y represents translate() which positions the top-left corner // So we need: top-left = center - (width/2, height/2) setPosition({ x: cardCenterContainerX - cardRect.width / 2, y: cardCenterContainerY - cardRect.height / 2, }) } const handlePointerUp = (e: React.PointerEvent) => { setIsDragging(false) dragStartRef.current = null console.log('[Shadow] Drag released, speed decaying to 0') console.log( `[GrabPoint] Final rotation: ${rotation.toFixed(1)}° (base was ${baseRotationRef.current.toFixed(1)}°)` ) // Gradually decay speed back to 0 for smooth shadow transition const decayInterval = setInterval(() => { setDragSpeed((prev) => { const newSpeed = prev * 0.8 // Decay by 20% each frame if (newSpeed < 1) { clearInterval(decayInterval) return 0 } return newSpeed }) }, 50) // Update every 50ms // Release the pointer capture e.currentTarget.releasePointerCapture(e.pointerId) } // Calculate dynamic shadow based on drag speed // Base shadow: 0 8px 24px rgba(0, 0, 0, 0.3) // Fast drag: 0 32px 64px rgba(0, 0, 0, 0.6) const shadowY = 8 + (dragSpeed / 100) * 24 // 8px to 32px const shadowBlur = 24 + (dragSpeed / 100) * 40 // 24px to 64px const shadowOpacity = 0.3 + (dragSpeed / 100) * 0.3 // 0.3 to 0.6 const boxShadow = `0 ${shadowY}px ${shadowBlur}px rgba(0, 0, 0, ${shadowOpacity})` return ( <div ref={cardRef} onPointerDown={handlePointerDown} onPointerMove={handlePointerMove} onPointerUp={handlePointerUp} style={{ position: 'absolute', left: 0, top: 0, transform: `translate(${position.x}px, ${position.y}px) rotate(${rotation}deg) scale(${isDragging ? 1.05 : 1})`, zIndex, touchAction: 'none', cursor: isDragging ? 'grabbing' : 'grab', transition: isDragging ? 'none' : 'transform 0.2s ease-out', }} className={css({ userSelect: 'none', })} > <div style={{ boxShadow, // Dynamic shadow based on drag speed }} className={css({ bg: 'white', rounded: 'lg', p: '4', display: 'flex', flexDirection: 'column', alignItems: 'center', gap: '2', minW: '120px', border: '2px solid rgba(0, 0, 0, 0.1)', transition: 'box-shadow 0.1s', // Quick transition for responsive feel })} > {/* Abacus visualization */} <div className={css({ transform: 'scale(0.6)', transformOrigin: 'center', })} > <AbacusReact value={card.number} columns={3} beadShape={appConfig.beadShape} /> </div> {/* Number display */} <div className={css({ fontSize: 'xl', fontWeight: 'bold', color: 'gray.800', fontFamily: 'mono', })} > {card.number} </div> </div> </div> ) } |