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 | import type { TutorialHint, ConstructionState, EuclidViewportState, IntersectionCandidate, } from '../types' import { getPoint } from '../engine/constructionState' import { isCandidateBeyondPoint } from '../engine/intersections' import { resolveSelector } from '../engine/selectors' import { worldToScreen2D } from '../../shared/coordinateConversions' const HINT_COLOR = 'rgba(78, 121, 167,' const HINT_FILL = `${HINT_COLOR} 0.7)` function toScreen(wx: number, wy: number, viewport: EuclidViewportState, w: number, h: number) { return worldToScreen2D( wx, wy, viewport.center.x, viewport.center.y, viewport.pixelsPerUnit, viewport.pixelsPerUnit, w, h ) } // ── Individual hint renderers ────────────────────────────────────── function renderPointHint(ctx: CanvasRenderingContext2D, sx: number, sy: number, time: number) { // Pulsing ring const pulse = 1 + Math.sin(time * 4) * 0.15 const ringRadius = 16 * pulse const alpha = 0.35 + Math.sin(time * 4) * 0.15 ctx.beginPath() ctx.arc(sx, sy, ringRadius, 0, Math.PI * 2) ctx.strokeStyle = `${HINT_COLOR} ${alpha})` ctx.lineWidth = 2.5 ctx.stroke() // Bouncing arrow above the point const bounce = Math.sin(time * 3) * 5 const arrowTipY = sy - 28 + bounce const arrowBaseY = arrowTipY - 18 // Shaft ctx.beginPath() ctx.moveTo(sx, arrowBaseY) ctx.lineTo(sx, arrowTipY) ctx.strokeStyle = HINT_FILL ctx.lineWidth = 2.5 ctx.stroke() // Head (triangle) ctx.beginPath() ctx.moveTo(sx, arrowTipY + 5) ctx.lineTo(sx - 6, arrowTipY - 3) ctx.lineTo(sx + 6, arrowTipY - 3) ctx.closePath() ctx.fillStyle = HINT_FILL ctx.fill() } function renderArrowHint( ctx: CanvasRenderingContext2D, fromSx: number, fromSy: number, toSx: number, toSy: number, time: number ) { const dx = toSx - fromSx const dy = toSy - fromSy const len = Math.sqrt(dx * dx + dy * dy) if (len < 1) return const angle = Math.atan2(dy, dx) // Marching-ants dashed line ctx.save() ctx.beginPath() ctx.setLineDash([10, 6]) ctx.lineDashOffset = -(time * 60) % 16 ctx.moveTo(fromSx, fromSy) ctx.lineTo(toSx, toSy) ctx.strokeStyle = `${HINT_COLOR} 0.4)` ctx.lineWidth = 2 ctx.stroke() ctx.setLineDash([]) ctx.restore() // Arrowhead at destination const headLen = 12 ctx.beginPath() ctx.moveTo(toSx, toSy) ctx.lineTo(toSx - headLen * Math.cos(angle - 0.4), toSy - headLen * Math.sin(angle - 0.4)) ctx.lineTo(toSx - headLen * Math.cos(angle + 0.4), toSy - headLen * Math.sin(angle + 0.4)) ctx.closePath() ctx.fillStyle = HINT_FILL ctx.fill() // Pulsing ring at destination const pulse = 1 + Math.sin(time * 4) * 0.15 const alpha = 0.35 + Math.sin(time * 4) * 0.15 ctx.beginPath() ctx.arc(toSx, toSy, 16 * pulse, 0, Math.PI * 2) ctx.strokeStyle = `${HINT_COLOR} ${alpha})` ctx.lineWidth = 2.5 ctx.stroke() } function renderSweepHint( ctx: CanvasRenderingContext2D, cx: number, cy: number, screenRadius: number, time: number ) { // Rotating dashed arc with leading dot — "sweep around" const r = screenRadius + 18 const rotationOffset = time * 1.5 const arcLen = Math.PI * 1.6 // ~288° ctx.save() ctx.beginPath() ctx.arc(cx, cy, r, rotationOffset, rotationOffset + arcLen) ctx.setLineDash([6, 4]) ctx.lineDashOffset = -(time * 50) % 10 ctx.strokeStyle = `${HINT_COLOR} 0.3)` ctx.lineWidth = 2.5 ctx.stroke() ctx.setLineDash([]) // Leading dot at arc end const endAngle = rotationOffset + arcLen const ex = cx + r * Math.cos(endAngle) const ey = cy + r * Math.sin(endAngle) ctx.beginPath() ctx.arc(ex, ey, 5, 0, Math.PI * 2) ctx.fillStyle = `${HINT_COLOR} 0.6)` ctx.fill() ctx.restore() } function renderCandidatesHint( ctx: CanvasRenderingContext2D, candidates: IntersectionCandidate[], viewport: EuclidViewportState, w: number, h: number, time: number ) { const pulse = 1 + Math.sin(time * 3) * 0.2 const alpha = 0.4 + Math.sin(time * 3) * 0.2 for (const c of candidates) { const sc = toScreen(c.x, c.y, viewport, w, h) // Pulsing ring ctx.beginPath() ctx.arc(sc.x, sc.y, 14 * pulse, 0, Math.PI * 2) ctx.strokeStyle = `${HINT_COLOR} ${alpha})` ctx.lineWidth = 2.5 ctx.stroke() } // Bouncing arrow on the first (upper) candidate if (candidates.length > 0) { // Pick the candidate with higher Y (upper in world, lower screen Y) const upper = candidates.reduce((a, b) => (a.y > b.y ? a : b)) const sc = toScreen(upper.x, upper.y, viewport, w, h) renderPointHint(ctx, sc.x, sc.y, time) } } // ── Main entry point ─────────────────────────────────────────────── export function renderTutorialHint( ctx: CanvasRenderingContext2D, hint: TutorialHint, state: ConstructionState, viewport: EuclidViewportState, w: number, h: number, candidates: IntersectionCandidate[], time: number ): void { if (hint.type === 'none') return if (hint.type === 'point') { const pt = getPoint(state, hint.pointId) if (!pt) return const sc = toScreen(pt.x, pt.y, viewport, w, h) renderPointHint(ctx, sc.x, sc.y, time) return } if (hint.type === 'arrow') { const from = getPoint(state, hint.fromId) const to = getPoint(state, hint.toId) if (!from || !to) return const sf = toScreen(from.x, from.y, viewport, w, h) const st = toScreen(to.x, to.y, viewport, w, h) renderArrowHint(ctx, sf.x, sf.y, st.x, st.y, time) return } if (hint.type === 'sweep') { const center = getPoint(state, hint.centerId) const radiusPt = getPoint(state, hint.radiusPointId) if (!center || !radiusPt) return const sc = toScreen(center.x, center.y, viewport, w, h) const dx = radiusPt.x - center.x const dy = radiusPt.y - center.y const worldRadius = Math.sqrt(dx * dx + dy * dy) const screenRadius = worldRadius * viewport.pixelsPerUnit renderSweepHint(ctx, sc.x, sc.y, screenRadius, time) return } if (hint.type === 'candidates') { // Filter candidates by ofA/ofB when specified (resolve selectors to element IDs) let filtered: IntersectionCandidate[] if (hint.ofA != null && hint.ofB != null) { const resolvedA = resolveSelector(hint.ofA, state) const resolvedB = resolveSelector(hint.ofB, state) if (!resolvedA || !resolvedB) return filtered = candidates.filter( (c) => (c.ofA === resolvedA && c.ofB === resolvedB) || (c.ofA === resolvedB && c.ofB === resolvedA) ) } else { filtered = candidates } // Further filter by beyondId when specified (e.g. "beyond B on segment DB") if (hint.beyondId) { filtered = filtered.filter((c) => isCandidateBeyondPoint(c, hint.beyondId!, c.ofA, c.ofB, state) ) } // In guided mode, only show one candidate to avoid confusing the student. // Pick the one with the highest Y (convention matching the arrow target). if (filtered.length > 1) { const preferred = filtered.reduce((a, b) => (a.y > b.y ? a : b)) filtered = [preferred] } renderCandidatesHint(ctx, filtered, viewport, w, h, time) return } } |