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 | 'use client' import { useMemo } from 'react' import type { WordProblem, AnnotationTag } from '../wordProblems/types' import type { CoordinatePlaneState } from '../types' import { worldToScreen2D } from '../../shared/coordinateConversions' /** Colors matching WordProblemCard tag colors */ const TAG_COLORS: Partial<Record<AnnotationTag, string>> = { slope: '#f59e0b', intercept: '#3b82f6', target: '#ef4444', answer: '#10b981', point1: '#8b5cf6', point2: '#ec4899', } interface AnnotationConnectorsProps { problem: WordProblem spanRefs: Map<AnnotationTag, HTMLSpanElement> stateRef: React.MutableRefObject<CoordinatePlaneState> canvasWidth: number canvasHeight: number revealStep: number isDark: boolean containerRef: React.RefObject<HTMLDivElement | null> } interface ConnectorLine { tag: AnnotationTag fromX: number fromY: number toX: number toY: number color: string index: number } export function AnnotationConnectors({ problem, spanRefs, stateRef, canvasWidth, canvasHeight, revealStep, isDark, containerRef, }: AnnotationConnectorsProps) { const connectors = useMemo(() => { const container = containerRef.current if (!container) return [] const containerRect = container.getBoundingClientRect() const state = stateRef.current const lines: ConnectorLine[] = [] // Get annotated spans that have geometric targets const annotatedSpans = problem.spans.filter( (s) => s.tag && s.tag !== 'context' && s.tag !== 'question' ) annotatedSpans.forEach((span, index) => { if (index >= revealStep) return // Not yet revealed if (!span.tag) return const color = TAG_COLORS[span.tag] if (!color) return // Get text span position const spanEl = spanRefs.get(span.tag) if (!spanEl) return const spanRect = spanEl.getBoundingClientRect() const fromX = spanRect.left + spanRect.width / 2 - containerRect.left const fromY = spanRect.bottom - containerRect.top // Compute target geometry position const target = getGeometryTarget(span.tag, problem, state, canvasWidth, canvasHeight) if (!target) return lines.push({ tag: span.tag, fromX, fromY, toX: target.x, toY: target.y, color, index, }) }) return lines }, [problem, spanRefs, stateRef, canvasWidth, canvasHeight, revealStep, containerRef]) if (connectors.length === 0) return null return ( <svg data-component="annotation-connectors" style={{ position: 'absolute', inset: 0, width: '100%', height: '100%', pointerEvents: 'none', zIndex: 51, }} > {connectors.map((c) => ( <ConnectorLine key={c.tag} connector={c} isDark={isDark} /> ))} </svg> ) } function ConnectorLine({ connector: c, isDark }: { connector: ConnectorLine; isDark: boolean }) { // Animate the line drawing using stroke-dasharray/offset const length = Math.sqrt((c.toX - c.fromX) ** 2 + (c.toY - c.fromY) ** 2) return ( <g> <line x1={c.fromX} y1={c.fromY} x2={c.toX} y2={c.toY} stroke={c.color} strokeWidth={1.5} strokeDasharray={length} strokeDashoffset={0} opacity={0.7} style={{ transition: 'stroke-dashoffset 400ms ease-out', }} /> {/* Target dot */} <circle cx={c.toX} cy={c.toY} r={4} fill={c.color} opacity={0.8} /> </g> ) } /** Map annotation tags to geometric positions on the canvas */ function getGeometryTarget( tag: AnnotationTag, problem: WordProblem, state: CoordinatePlaneState, canvasWidth: number, canvasHeight: number ): { x: number; y: number } | null { const toScreen = (wx: number, wy: number) => worldToScreen2D( wx, wy, state.center.x, state.center.y, state.pixelsPerUnit.x, state.pixelsPerUnit.y, canvasWidth, canvasHeight ) const { slope, intercept } = problem.equation const m = slope.num / slope.den const b = intercept.num / intercept.den switch (tag) { case 'slope': { // Point at rise/run triangle midpoint — roughly at x=1 on the line const x = 1 const y = m * x + b return toScreen(x, y) } case 'intercept': { // Y-intercept point return toScreen(0, b) } case 'target': { // Horizontal line at y = target — show at the solution x return toScreen(problem.answer.x, problem.answer.y) } case 'answer': { // The solution intersection point return toScreen(problem.answer.x, problem.answer.y) } case 'point1': { // First given point (level 4) const spans = problem.spans.find((s) => s.tag === 'point1') if (spans?.value != null) { // Point value is encoded in the span — but for now use the answer return toScreen(0, b) } return null } case 'point2': { // Second given point (level 4) return toScreen(problem.answer.x, problem.answer.y) } default: return null } } |