Press n or j to go to the next uncovered block, b, p or k for the previous block.
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777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 | 'use client' import { useRef, useEffect, useCallback, useState } from 'react' import { useTheme } from '../../../contexts/ThemeContext' import type { CoordinatePlaneState, ZoomMode, CoordinatePlaneOverlay } from './types' import type { CollisionFadeMap } from '../shared/collisionDetection' import { renderCoordinatePlane } from './renderCoordinatePlane' import { useCoordinatePlaneTouch } from './useCoordinatePlaneTouch' import { ToyDebugPanel } from '../ToyDebugPanel' import { KeyboardShortcutsOverlay } from '../shared/KeyboardShortcutsOverlay' import type { ShortcutEntry } from '../shared/KeyboardShortcutsOverlay' import { useVisualDebugSafe } from '@/contexts/VisualDebugContext' import { screenToWorld2D, worldToScreen2D } from '../shared/coordinateConversions' import type { RulerState, VisualRulerState, EquationProbeState, SlopeGuideState, } from './ruler/types' import { renderRuler, rulerToScreen } from './ruler/renderRuler' import { useRulerInteraction } from './ruler/useRulerInteraction' import { equationFromPoints } from './ruler/fractionMath' import { RulerEquationLabel } from './ruler/RulerEquationLabel' import type { EquationDisplayForm } from './ruler/RulerEquationLabel' import { useEquationSlider } from './ruler/useEquationSlider' import { useChallenge } from './challenge/useChallenge' import type { ViewportAnimation } from './challenge/types' import { WordProblemCard } from './challenge/WordProblemCard' import { computeCardPlacement } from './challenge/quadrantPlacement' import { computeViewportTarget } from './challenge/viewportAnimation' import { renderChallengeAnnotations } from './challenge/renderChallengeAnnotations' import type { DifficultyLevel } from './wordProblems/types' import { smoothstep } from '../shared/tickMath' const SHORTCUTS: ShortcutEntry[] = [ { key: 'Drag', description: 'Pan' }, { key: 'Scroll / Pinch', description: 'Zoom (uniform)' }, { key: 'Z', description: 'Toggle uniform / independent zoom' }, { key: 'Shift + Scroll', description: 'Zoom X only (independent mode)' }, { key: 'Alt + Scroll', description: 'Zoom Y only (independent mode)' }, { key: 'Drag handle', description: 'Move ruler endpoint (snaps to grid)' }, { key: 'Drag ruler', description: 'Slide ruler (preserves slope)' }, { key: 'R', description: 'Toggle ruler visibility' }, { key: 'P', description: 'New word problem' }, { key: '?', description: 'Toggle this help' }, ] interface CoordinatePlaneProps { overlays?: CoordinatePlaneOverlay[] challenge?: { enabled: boolean difficulty?: DifficultyLevel onComplete?: (problem: import('./wordProblems/types').WordProblem, attempts: number) => void } } export function CoordinatePlane({ overlays, challenge }: CoordinatePlaneProps) { const canvasRef = useRef<HTMLCanvasElement | null>(null) const containerRef = useRef<HTMLDivElement | null>(null) const stateRef = useRef<CoordinatePlaneState>({ center: { x: 0, y: 0 }, pixelsPerUnit: { x: 60, y: 60 }, }) const zoomModeRef = useRef<ZoomMode>('uniform') const [zoomMode, setZoomMode] = useState<ZoomMode>('uniform') const [showShortcuts, setShowShortcuts] = useState(false) const [showRuler, setShowRuler] = useState(true) const [equationForm, setEquationForm] = useState<EquationDisplayForm>('slope-intercept') const xCollisionFadeMapRef = useRef<CollisionFadeMap>(new Map()) const yCollisionFadeMapRef = useRef<CollisionFadeMap>(new Map()) // Ruler state const rulerRef = useRef<RulerState>({ ax: -3, ay: -1, bx: 3, by: 2 }) const visualRulerRef = useRef<VisualRulerState>({ ax: -3, ay: -1, bx: 3, by: 2 }) const lastFrameTimeRef = useRef(performance.now()) const pointerCapturedRef = useRef(false) const [activeHandle, setActiveHandle] = useState<'handleA' | 'handleB' | 'body' | null>(null) const [rulerVersion, setRulerVersion] = useState(0) const equationProbeRef = useRef<EquationProbeState>({ active: false, t: 0.5, worldX: 0, worldY: 0, nearX: null, nearY: null, solvedAtNearX: null, solvedAtNearY: null, }) const slopeGuideRef = useRef<SlopeGuideState | null>(null) const [hideCursor, setHideCursor] = useState(false) const equationLabelRef = useRef<HTMLDivElement | null>(null) // Zoom velocity state (smoothed for visual wash) const zoomVelocityRef = useRef(0) const zoomHueRef = useRef(0) const zoomFocalRef = useRef({ x: 0.5, y: 0.5 }) // Brief toast for zoom mode changes const [zoomToast, setZoomToast] = useState<string | null>(null) const toastTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null) // Challenge system const viewportAnimRef = useRef<ViewportAnimation | null>(null) const rafRef = useRef<number>(0) const needsDrawRef = useRef(true) const { resolvedTheme } = useTheme() const isDark = resolvedTheme === 'dark' const { isVisualDebugEnabled } = useVisualDebugSafe() // Debug state for display const [debugInfo, setDebugInfo] = useState({ centerX: 0, centerY: 0, ppuX: 60, ppuY: 60, cursorWX: 0, cursorWY: 0, }) const requestDraw = useCallback(() => { needsDrawRef.current = true }, []) const handleZoomVelocity = useCallback( (velocity: number, focalX: number, focalY: number) => { zoomVelocityRef.current = velocity zoomHueRef.current = (zoomHueRef.current + velocity * 200 + 360) % 360 zoomFocalRef.current = { x: focalX, y: focalY } requestDraw() }, [requestDraw] ) // Ruler interaction (must be called before pan/zoom so it can capture the pointer) const handleRulerChange = useCallback(() => { setRulerVersion((v) => v + 1) requestDraw() }, [requestDraw]) const toggleEquationForm = useCallback(() => { setEquationForm((f) => (f === 'slope-intercept' ? 'standard' : 'slope-intercept')) }, []) const handleActiveHandleChange = useCallback( (zone: 'handleA' | 'handleB' | 'body' | null) => { setActiveHandle(zone) requestDraw() }, [requestDraw] ) useRulerInteraction({ rulerRef, stateRef, canvasRef, pointerCapturedRef, onRulerChange: handleRulerChange, onActiveHandleChange: handleActiveHandleChange, enabled: showRuler, slopeGuideRef, }) useCoordinatePlaneTouch({ stateRef, canvasRef, zoomModeRef, pointerCapturedRef, onStateChange: requestDraw, onZoomVelocity: handleZoomVelocity, }) // Challenge system const challengeEnabled = challenge?.enabled ?? false const handleChallengeSummon = useCallback( (problem: import('./wordProblems/types').WordProblem) => { const canvas = canvasRef.current if (!canvas) return const dpr = window.devicePixelRatio || 1 const cw = canvas.width / dpr const ch = canvas.height / dpr const target = computeViewportTarget(problem, cw, ch, stateRef.current) // Switch to independent zoom so the different axis scales are preserved // during subsequent user interactions (scroll, pinch) zoomModeRef.current = 'independent' setZoomMode('independent') // Ensure ruler is visible (needed to solve the problem) setShowRuler(true) viewportAnimRef.current = { active: true, from: { cx: stateRef.current.center.x, cy: stateRef.current.center.y, ppuX: stateRef.current.pixelsPerUnit.x, ppuY: stateRef.current.pixelsPerUnit.y, }, to: target, startTime: performance.now(), duration: 600, } needsDrawRef.current = true }, [] ) const { challengeRef: challengeStateRef, challengeVersion, summonProblem, dismissProblem, handleAnswerCorrect, phase: challengePhase, problem: challengeProblem, } = useChallenge({ rulerRef, stateRef, rulerVersion, enabled: challengeEnabled, onComplete: challenge?.onComplete, onSummon: handleChallengeSummon, }) // Toggle zoom mode const toggleZoomMode = useCallback(() => { const newMode = zoomModeRef.current === 'uniform' ? 'independent' : 'uniform' if (newMode === 'uniform') { const avg = (stateRef.current.pixelsPerUnit.x + stateRef.current.pixelsPerUnit.y) / 2 stateRef.current.pixelsPerUnit.x = avg stateRef.current.pixelsPerUnit.y = avg } zoomModeRef.current = newMode setZoomMode(newMode) requestDraw() // Show toast const label = newMode === 'uniform' ? 'Uniform Zoom' : 'Independent Zoom' setZoomToast(label) if (toastTimerRef.current) clearTimeout(toastTimerRef.current) toastTimerRef.current = setTimeout(() => setZoomToast(null), 1500) }, [requestDraw]) // Keyboard shortcuts useEffect(() => { function handleKeyDown(e: KeyboardEvent) { // Don't capture when typing in inputs if (e.target instanceof HTMLInputElement || e.target instanceof HTMLTextAreaElement) return if (e.key === '?') { e.preventDefault() setShowShortcuts((prev) => !prev) } else if (e.key === 'z' || e.key === 'Z') { if (!e.metaKey && !e.ctrlKey) { e.preventDefault() toggleZoomMode() } } else if (e.key === 'r' || e.key === 'R') { if (!e.metaKey && !e.ctrlKey) { e.preventDefault() setShowRuler((prev) => { const next = !prev const label = next ? 'Ruler On' : 'Ruler Off' setZoomToast(label) if (toastTimerRef.current) clearTimeout(toastTimerRef.current) toastTimerRef.current = setTimeout(() => setZoomToast(null), 1500) return next }) requestDraw() } } else if (e.key === 'p' || e.key === 'P') { if (!e.metaKey && !e.ctrlKey) { e.preventDefault() summonProblem(challenge?.difficulty ?? 3) } } } window.addEventListener('keydown', handleKeyDown) return () => window.removeEventListener('keydown', handleKeyDown) }, [toggleZoomMode, requestDraw, summonProblem, challenge?.difficulty]) // Forward wheel events from DOM overlays (e.g. equation card) to canvas for zoom useEffect(() => { const container = containerRef.current const canvas = canvasRef.current if (!container || !canvas) return function handleWheel(e: WheelEvent) { // Only forward events that didn't originate from the canvas itself if (!canvas!.contains(e.target as Node)) { e.preventDefault() canvas!.dispatchEvent( new WheelEvent('wheel', { deltaX: e.deltaX, deltaY: e.deltaY, deltaZ: e.deltaZ, deltaMode: e.deltaMode, clientX: e.clientX, clientY: e.clientY, screenX: e.screenX, screenY: e.screenY, ctrlKey: e.ctrlKey, shiftKey: e.shiftKey, altKey: e.altKey, metaKey: e.metaKey, bubbles: false, }) ) } } container.addEventListener('wheel', handleWheel, { passive: false }) return () => container.removeEventListener('wheel', handleWheel) }, []) // Canvas resize observer useEffect(() => { const container = containerRef.current const canvas = canvasRef.current if (!container || !canvas) return const ro = new ResizeObserver(() => { const rect = container.getBoundingClientRect() const dpr = window.devicePixelRatio || 1 canvas.width = rect.width * dpr canvas.height = rect.height * dpr canvas.style.width = `${rect.width}px` canvas.style.height = `${rect.height}px` requestDraw() }) ro.observe(container) return () => ro.disconnect() }, [requestDraw]) // Mousemove for debug cursor world coords useEffect(() => { if (!isVisualDebugEnabled) return const canvas = canvasRef.current if (!canvas) return function handleMove(e: MouseEvent) { const rect = canvas!.getBoundingClientRect() const sx = e.clientX - rect.left const sy = e.clientY - rect.top const s = stateRef.current const w = screenToWorld2D( sx, sy, s.center.x, s.center.y, s.pixelsPerUnit.x, s.pixelsPerUnit.y, rect.width, rect.height ) setDebugInfo({ centerX: s.center.x, centerY: s.center.y, ppuX: s.pixelsPerUnit.x, ppuY: s.pixelsPerUnit.y, cursorWX: w.x, cursorWY: w.y, }) } canvas.addEventListener('mousemove', handleMove) return () => canvas.removeEventListener('mousemove', handleMove) }, [isVisualDebugEnabled]) // RAF render loop useEffect(() => { let running = true const LERP_SPEED = 12 function draw() { if (!running) return const canvas = canvasRef.current // ── Lerp visual ruler toward snapped target ── const now = performance.now() const dt = Math.min((now - lastFrameTimeRef.current) / 1000, 0.05) // cap at 50ms lastFrameTimeRef.current = now const target = rulerRef.current const vis = visualRulerRef.current const factor = 1 - Math.exp(-LERP_SPEED * dt) let stillAnimating = false for (const key of ['ax', 'ay', 'bx', 'by'] as const) { const diff = target[key] - vis[key] if (Math.abs(diff) < 0.001) { vis[key] = target[key] } else { vis[key] += diff * factor stillAnimating = true } } if (stillAnimating) { needsDrawRef.current = true } // ── Viewport animation (challenge auto-pan/zoom) ── const viewAnim = viewportAnimRef.current if (viewAnim?.active) { const elapsed = now - viewAnim.startTime const t = smoothstep(Math.min(1, elapsed / viewAnim.duration)) stateRef.current.center.x = viewAnim.from.cx + (viewAnim.to.cx - viewAnim.from.cx) * t stateRef.current.center.y = viewAnim.from.cy + (viewAnim.to.cy - viewAnim.from.cy) * t // Interpolate PPU in log-space for perceptually smooth zoom stateRef.current.pixelsPerUnit.x = Math.exp( Math.log(viewAnim.from.ppuX) + (Math.log(viewAnim.to.ppuX) - Math.log(viewAnim.from.ppuX)) * t ) stateRef.current.pixelsPerUnit.y = Math.exp( Math.log(viewAnim.from.ppuY) + (Math.log(viewAnim.to.ppuY) - Math.log(viewAnim.from.ppuY)) * t ) needsDrawRef.current = true if (t >= 1) { viewAnim.active = false // ── Reposition off-screen ruler handles now that the viewport has settled ── if (canvas && showRuler) { const dpr = window.devicePixelRatio || 1 const cw = canvas.width / dpr const ch = canvas.height / dpr const margin = 50 const { center, pixelsPerUnit: ppu } = stateRef.current const r = rulerRef.current const isOnScreen = (wx: number, wy: number) => { const s = worldToScreen2D(wx, wy, center.x, center.y, ppu.x, ppu.y, cw, ch) return s.x >= margin && s.x <= cw - margin && s.y >= margin && s.y <= ch - margin } const aOk = isOnScreen(r.ax, r.ay) const bOk = isOnScreen(r.bx, r.by) if (!aOk || !bOk) { const cx = Math.round(center.x) const cy = Math.round(center.y) // Avoid placing on the challenge answer point const ans = challengeStateRef.current.problem?.answer const isAnswer = (x: number, y: number) => ans != null && x === ans.x && y === ans.y // Search outward from center for a visible, non-answer integer point const findVisible = (avoidX: number, avoidY: number) => { for (let radius = 0; radius <= 5; radius++) { for (let dx = -radius; dx <= radius; dx++) { for (let dy = -radius; dy <= radius; dy++) { if (Math.abs(dx) !== radius && Math.abs(dy) !== radius) continue const px = cx + dx, py = cy + dy if (px === avoidX && py === avoidY) continue if (isAnswer(px, py)) continue if (isOnScreen(px, py)) return { x: px, y: py } } } } return { x: cx, y: cy } } let { ax, ay, bx, by } = r if (!aOk) { const p = findVisible(bx, by) ax = p.x ay = p.y } if (!bOk) { const p = findVisible(ax, ay) bx = p.x by = p.y } rulerRef.current = { ax, ay, bx, by } } } } } if (canvas && needsDrawRef.current) { needsDrawRef.current = false const dpr = window.devicePixelRatio || 1 const cssWidth = canvas.width / dpr const cssHeight = canvas.height / dpr const ctx = canvas.getContext('2d') if (ctx) { ctx.save() ctx.scale(dpr, dpr) const animatingPlane = renderCoordinatePlane( ctx, stateRef.current, cssWidth, cssHeight, isDark, zoomVelocityRef.current, zoomHueRef.current, zoomFocalRef.current.x, zoomFocalRef.current.y, xCollisionFadeMapRef.current, yCollisionFadeMapRef.current, overlays, showRuler ? equationProbeRef.current : undefined ) // Render ruler on top of everything (when visible) if (showRuler) { renderRuler( ctx, visualRulerRef.current, rulerRef.current, stateRef.current, cssWidth, cssHeight, isDark, activeHandle, equationProbeRef.current, slopeGuideRef.current ) } // Render challenge annotations (constraint line, reveal markers) const challengeState = challengeStateRef.current if (challengeState.problem && challengeState.phase !== 'idle') { renderChallengeAnnotations( ctx, challengeState, challengeState.problem, stateRef.current, cssWidth, cssHeight, isDark ) } ctx.restore() // ── Sync equation label DOM position with viewport ── const labelEl = equationLabelRef.current if (labelEl) { const labelInfo = rulerToScreen( visualRulerRef.current, stateRef.current, cssWidth, cssHeight ) if (labelInfo.length >= 1) { const t = equationProbeRef.current.t const posX = labelInfo.ax + (labelInfo.bx - labelInfo.ax) * t const posY = labelInfo.ay + (labelInfo.by - labelInfo.ay) * t let displayAngle = labelInfo.angle while (displayAngle > Math.PI / 2) displayAngle -= Math.PI while (displayAngle < -Math.PI / 2) displayAngle += Math.PI const offsetPx = 18 // Flip label to opposite side of ruler when challenge staircase is visible const flipLabel = challengeState.problem && challengeState.phase !== 'idle' const sign = flipLabel ? 1 : -1 const perpX = sign * Math.sin(displayAngle) * offsetPx const perpY = -sign * Math.cos(displayAngle) * offsetPx const canvasOffsetLeft = canvas.offsetLeft || 0 const canvasOffsetTop = canvas.offsetTop || 0 labelEl.style.left = `${canvasOffsetLeft + posX + perpX}px` labelEl.style.top = `${canvasOffsetTop + posY + perpY}px` labelEl.style.transform = `translate(-50%, -50%) rotate(${displayAngle}rad)` } } if (animatingPlane) { needsDrawRef.current = true } } } // Decay zoom velocity zoomVelocityRef.current *= 0.9 if (Math.abs(zoomVelocityRef.current) > 0.001) { needsDrawRef.current = true } rafRef.current = requestAnimationFrame(draw) } rafRef.current = requestAnimationFrame(draw) return () => { running = false cancelAnimationFrame(rafRef.current) } }, [isDark, overlays, activeHandle, showRuler, challengeVersion]) return ( <div ref={containerRef} data-component="coordinate-plane" style={{ width: '100%', height: '100%', position: 'relative', touchAction: 'none', overflow: 'hidden', cursor: hideCursor ? 'none' : undefined, }} > <canvas ref={canvasRef} data-element="coordinate-plane-canvas" style={{ display: 'block', width: '100%', height: '100%', }} /> {/* Ruler equation label (DOM overlay) */} {showRuler && ( <RulerEquationOverlay rulerRef={rulerRef} stateRef={stateRef} canvasRef={canvasRef} probeRef={equationProbeRef} pointerCapturedRef={pointerCapturedRef} requestDraw={requestDraw} isDark={isDark} rulerVersion={rulerVersion} onDragStateChange={setHideCursor} equationLabelRef={equationLabelRef} equationForm={equationForm} onClickLabel={toggleEquationForm} /> )} {/* Word problem challenge card */} {challengeProblem && challengePhase !== 'idle' && ( <WordProblemCard problem={challengeProblem} phase={challengePhase} placement={computeCardPlacement( challengeProblem.answer.x, challengeProblem.answer.y, stateRef.current, canvasRef.current ? canvasRef.current.width / (window.devicePixelRatio || 1) : 800, canvasRef.current ? canvasRef.current.height / (window.devicePixelRatio || 1) : 600 )} revealStep={challengeStateRef.current.revealStep} isDark={isDark} onNewProblem={() => summonProblem(challenge?.difficulty ?? 3)} onDismiss={dismissProblem} onAnswerCorrect={() => handleAnswerCorrect(challenge?.difficulty ?? 3)} /> )} {/* Challenge annotations are now rendered directly on canvas via renderChallengeAnnotations */} {/* Subtle "?" hint in corner */} <div data-element="shortcuts-hint" style={{ position: 'absolute', bottom: 12, left: 12, fontSize: 12, color: isDark ? 'rgba(148, 163, 184, 0.5)' : 'rgba(100, 116, 139, 0.5)', pointerEvents: 'none', userSelect: 'none', fontFamily: 'system-ui, sans-serif', }} > Press ? for shortcuts </div> {/* Zoom mode toast */} {zoomToast && ( <div data-element="zoom-mode-toast" style={{ position: 'absolute', top: 16, left: '50%', transform: 'translateX(-50%)', padding: '6px 16px', borderRadius: 8, background: isDark ? 'rgba(30, 41, 59, 0.9)' : 'rgba(255, 255, 255, 0.92)', backdropFilter: 'blur(8px)', border: isDark ? '1px solid rgba(71, 85, 105, 0.5)' : '1px solid rgba(203, 213, 225, 0.8)', color: isDark ? '#e2e8f0' : '#334155', fontSize: 13, fontWeight: 500, fontFamily: 'system-ui, sans-serif', pointerEvents: 'none', zIndex: 10, boxShadow: '0 2px 8px rgba(0,0,0,0.15)', }} > {zoomToast} </div> )} {/* Keyboard shortcuts overlay */} {showShortcuts && ( <KeyboardShortcutsOverlay shortcuts={SHORTCUTS} onClose={() => setShowShortcuts(false)} isDark={isDark} /> )} {/* Debug panel */} {isVisualDebugEnabled && ( <ToyDebugPanel title="Coordinate Plane"> <div style={{ fontFamily: 'monospace', fontSize: 11, lineHeight: 1.6 }}> <div> center: ({debugInfo.centerX.toFixed(2)}, {debugInfo.centerY.toFixed(2)}) </div> <div> ppu: ({debugInfo.ppuX.toFixed(1)}, {debugInfo.ppuY.toFixed(1)}) </div> <div> cursor: ({debugInfo.cursorWX.toFixed(4)}, {debugInfo.cursorWY.toFixed(4)}) </div> <div>mode: {zoomMode}</div> </div> </ToyDebugPanel> )} </div> ) } // ── Ruler equation DOM overlay ───────────────────────────────────── interface RulerEquationOverlayProps { rulerRef: React.MutableRefObject<RulerState> stateRef: React.MutableRefObject<CoordinatePlaneState> canvasRef: React.RefObject<HTMLCanvasElement | null> probeRef: React.MutableRefObject<EquationProbeState> pointerCapturedRef: React.MutableRefObject<boolean> requestDraw: () => void isDark: boolean /** Incremented when ruler state changes, to trigger re-render */ rulerVersion: number /** Called with true when dragging starts, false when dragging ends */ onDragStateChange: (dragging: boolean) => void /** Ref to the label's outer DOM element for RAF position sync */ equationLabelRef: React.RefObject<HTMLDivElement | null> /** Which equation form to display */ equationForm: EquationDisplayForm /** Called when user clicks the label (no drag) */ onClickLabel?: () => void } function RulerEquationOverlay({ rulerRef, stateRef, canvasRef, probeRef, pointerCapturedRef, requestDraw, isDark, rulerVersion, onDragStateChange, equationLabelRef, equationForm, onClickLabel, }: RulerEquationOverlayProps) { const { sliderT, isDragging, handlePointerDown } = useEquationSlider({ rulerRef, stateRef, canvasRef, probeRef, requestDraw, pointerCapturedRef, rulerVersion, onClickLabel, }) // Notify parent about drag state for cursor hiding useEffect(() => { onDragStateChange(isDragging) }, [isDragging, onDragStateChange]) const canvas = canvasRef.current if (!canvas) return null const dpr = window.devicePixelRatio || 1 const cssWidth = canvas.width / dpr const cssHeight = canvas.height / dpr if (cssWidth === 0 || cssHeight === 0) return null const ruler = rulerRef.current const state = stateRef.current const equation = equationFromPoints(ruler.ax, ruler.ay, ruler.bx, ruler.by) const info = rulerToScreen(ruler, state, cssWidth, cssHeight) // Don't show equation label for degenerate ruler if (info.length < 1) return null // Position at sliderT along the ruler instead of always midpoint const posX = info.ax + (info.bx - info.ax) * sliderT const posY = info.ay + (info.by - info.ay) * sliderT const canvasOffsetLeft = canvas.offsetLeft || 0 const canvasOffsetTop = canvas.offsetTop || 0 return ( <RulerEquationLabel containerRef={equationLabelRef} equation={equation} equationForm={equationForm} screenX={canvasOffsetLeft + posX} screenY={canvasOffsetTop + posY} angle={info.angle} isDark={isDark} isDragging={isDragging} onIndicatorPointerDown={handlePointerDown} /> ) } |