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| 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 | /** * computeAutoFit — Pure function that adjusts the viewport (center + pixelsPerUnit) * to frame the current construction within the visible canvas area. * * Extracted from the RAF render loop in EuclidCanvas.tsx. * Reads/writes viewport through RAFContext refs. */ import type { RAFContext } from './rafContext' import { AUTO_FIT_PAD_PX, AUTO_FIT_PAD_PX_MOBILE, AUTO_FIT_LERP, AUTO_FIT_MIN_PPU, AUTO_FIT_SOFT_MARGIN, AUTO_FIT_SWEEP_LERP_MIN, AUTO_FIT_POST_SWEEP_MS, AUTO_FIT_MAX_CENTER_PX, AUTO_FIT_MAX_PPU_DELTA, AUTO_FIT_SWEEP_PPU_DELTA, AUTO_FIT_CEREMONY_PPU_DELTA, AUTO_FIT_TIP_PAD_FRACTION, AUTO_FIT_DOCK_GAP, getConstructionBounds, expandBoundsForArc, expandBounds, getAutoFitMaxPpu, clampPpu, clampPpuWithMin, getFitRect, getScreenBounds, boundsWithinRect, clampCenterToRect, } from './viewportMath' import { getPoint } from './constructionState' import { MACRO_PREVIEW_REGISTRY } from './macroPreview' export function computeAutoFit( ctx: RAFContext, canvas: HTMLCanvasElement, cssWidth: number, cssHeight: number ): void { const compassPhase = ctx.compassPhaseRef.current const allowAutoFit = ctx.panZoomDisabledRef.current && (!ctx.pointerCapturedRef.current || compassPhase.tag === 'radius-set' || compassPhase.tag === 'sweeping') if (!allowAutoFit) return const pad = ctx.isMobileRef.current ? AUTO_FIT_PAD_PX_MOBILE : AUTO_FIT_PAD_PX const canvasRect = canvas.getBoundingClientRect() const dockRect = ctx.toolDockRef.current?.getBoundingClientRect() ?? null const reservedBottom = 0 const fitRect = getFitRect( cssWidth, cssHeight, canvasRect, dockRect, pad, AUTO_FIT_DOCK_GAP, reservedBottom ) const bounds = getConstructionBounds(ctx.constructionRef.current) if (!bounds) return // ── Expand bounds for compass sweep arc ── if (compassPhase.tag === 'sweeping') { const centerId = compassPhase.centerId as string const radius = compassPhase.radius as number const startAngle = compassPhase.startAngle as number const cumulativeSweep = compassPhase.cumulativeSweep as number const centerPoint = getPoint(ctx.constructionRef.current, centerId) if (centerPoint && radius > 0) { expandBoundsForArc(bounds, centerPoint.x, centerPoint.y, radius, startAngle, cumulativeSweep) } } // ── Expand bounds for ghost geometry (ceremony + G-toggle) ── const cer = ctx.macroRevealRef.current const inCeremony = cer != null const hoveredStep = ctx.hoveredMacroStepRef.current const includeGhostBounds = inCeremony || ctx.ghostBoundsEnabledRef.current if (includeGhostBounds) { const ceremonyLayerKeys = inCeremony ? new Set([...cer!.sequence.map((e) => e.layerKey), ...cer!.preRevealedLayers.keys()]) : null for (const layer of ctx.ghostLayersRef.current) { const key = `${layer.atStep}:${layer.depth}` // During ceremony: only include ceremony layers // With G toggle + hover: include only the hovered step's layers // With G toggle (no hover): include all ghost layers if (ceremonyLayerKeys && !ceremonyLayerKeys.has(key)) continue if (!ceremonyLayerKeys && hoveredStep != null && layer.atStep !== hoveredStep) continue for (const el of layer.elements) { if (el.kind === 'circle') { expandBounds(bounds, el.cx, el.cy, el.r) } else if (el.kind === 'segment') { expandBounds(bounds, el.x1, el.y1, 0) expandBounds(bounds, el.x2, el.y2, 0) } else if (el.kind === 'point') { expandBounds(bounds, el.x, el.y, 0) } } } } // ── Expand bounds for macro preview geometry ── let includeMacroPreview = false if (ctx.macroPreviewAutoFitRef.current) { const stepIdx = ctx.currentStepRef.current const stepExpected = stepIdx < ctx.stepsRef.current.length ? ctx.stepsRef.current[stepIdx].expected : null if (stepExpected?.type === 'macro') { const previewFn = MACRO_PREVIEW_REGISTRY[stepExpected.propId] if (previewFn) { const positions: { x: number; y: number }[] = [] for (const pid of stepExpected.inputPointIds) { const pt = getPoint(ctx.constructionRef.current, pid) if (pt) positions.push({ x: pt.x, y: pt.y }) } if (positions.length === stepExpected.inputPointIds.length) { const result = previewFn(positions) if (result) { includeMacroPreview = true for (const el of [...result.ghostElements, ...result.resultElements]) { if (el.kind === 'circle') { expandBounds(bounds, el.cx, el.cy, el.r) } else if (el.kind === 'segment') { expandBounds(bounds, el.x1, el.y1, 0) expandBounds(bounds, el.x2, el.y2, 0) } else if (el.kind === 'point') { expandBounds(bounds, el.x, el.y, 0) } } } } } } } // ── Compute target zoom ── const width = Math.max(1, bounds.maxX - bounds.minX) const height = Math.max(1, bounds.maxY - bounds.minY) const availableW = Math.max(1, fitRect.width - pad * 2) const availableH = Math.max(1, fitRect.height - pad * 2) const minPpuNeeded = Math.min(availableW / width, availableH / height) const fitArea = availableW * availableH const boundsArea = width * height // Suppress zoom-in when ghost/macro-preview bounds are included const shouldZoomIn = !includeGhostBounds && !includeMacroPreview && boundsArea <= fitArea * 0.25 const desiredPpu = Math.min(availableW / width, availableH / height) const maxPpu = getAutoFitMaxPpu(ctx.isTouchRef.current) const targetPpu = shouldZoomIn ? clampPpu(desiredPpu, maxPpu) : clampPpuWithMin(desiredPpu, minPpuNeeded, maxPpu) const targetCx = (bounds.minX + bounds.maxX) / 2 const targetCy = (bounds.minY + bounds.maxY) / 2 const v = ctx.viewportRef.current const prevCx = v.center.x const prevCy = v.center.y const prevPpu = v.pixelsPerUnit const screenBounds = getScreenBounds(bounds, v, cssWidth, cssHeight) const softOk = boundsWithinRect( screenBounds, { left: fitRect.left, right: fitRect.right, top: fitRect.top, bottom: fitRect.bottom, }, AUTO_FIT_SOFT_MARGIN ) // ── Sweep speed tracking ── const now = performance.now() let sweepSpeed = 0 if (compassPhase.tag === 'sweeping') { const cumulativeSweep = compassPhase.cumulativeSweep as number const lastSweep = ctx.lastSweepRef.current const lastTime = ctx.lastSweepTimeRef.current || now const dt = Math.max(1, now - lastTime) / 1000 sweepSpeed = Math.abs(cumulativeSweep - lastSweep) / dt ctx.lastSweepRef.current = cumulativeSweep ctx.lastSweepTimeRef.current = now ctx.lastSweepCenterRef.current = compassPhase.centerId as string } else { ctx.lastSweepRef.current = 0 } const sinceSweepMs = now - (ctx.lastSweepTimeRef.current || now) const isPostSweep = sinceSweepMs < AUTO_FIT_POST_SWEEP_MS // Dampen lerp when macro preview drives bounds const baseLerp = includeMacroPreview ? AUTO_FIT_LERP * 0.5 : AUTO_FIT_LERP const sweepLerp = compassPhase.tag === 'sweeping' || isPostSweep ? Math.max(AUTO_FIT_SWEEP_LERP_MIN, baseLerp / (1 + sweepSpeed * 0.4)) : baseLerp // ── Apply zoom (delta-capped) ── let effectivePpu = v.pixelsPerUnit const isSweeping = compassPhase.tag === 'sweeping' if (!softOk || targetPpu < v.pixelsPerUnit || shouldZoomIn) { const nextPpu = v.pixelsPerUnit + (targetPpu - v.pixelsPerUnit) * sweepLerp const ppuDeltaCap = inCeremony ? AUTO_FIT_CEREMONY_PPU_DELTA : isSweeping ? AUTO_FIT_SWEEP_PPU_DELTA : AUTO_FIT_MAX_PPU_DELTA const deltaPpu = Math.max(-ppuDeltaCap, Math.min(ppuDeltaCap, nextPpu - v.pixelsPerUnit)) // During sweep: only zoom out (negative delta), never in if (!isSweeping || deltaPpu <= 0) { effectivePpu = v.pixelsPerUnit + deltaPpu v.pixelsPerUnit = effectivePpu } } // ── Apply pan (rate-limited) ── let targetCenterX = targetCx - (fitRect.centerX - cssWidth / 2) / effectivePpu let targetCenterY = targetCy + (fitRect.centerY - cssHeight / 2) / effectivePpu if (compassPhase.tag === 'sweeping' || isPostSweep) { const anchorCenterId = compassPhase.tag === 'sweeping' ? (compassPhase.centerId as string) : ctx.lastSweepCenterRef.current const centerPoint = anchorCenterId ? getPoint(ctx.constructionRef.current, anchorCenterId) : null if (centerPoint) { const anchorScreenX = (centerPoint.x - v.center.x) * v.pixelsPerUnit + cssWidth / 2 const anchorScreenY = (v.center.y - centerPoint.y) * v.pixelsPerUnit + cssHeight / 2 targetCenterX = centerPoint.x - (anchorScreenX - cssWidth / 2) / effectivePpu targetCenterY = centerPoint.y + (anchorScreenY - cssHeight / 2) / effectivePpu } } if (ctx.isCompleteRef.current) { const clamped = clampCenterToRect( targetCenterX, targetCenterY, effectivePpu, bounds, { left: fitRect.left, right: fitRect.right, top: fitRect.top, bottom: fitRect.bottom, }, pad, cssWidth, cssHeight ) targetCenterX = clamped.centerX targetCenterY = clamped.centerY } const maxPx = shouldZoomIn ? AUTO_FIT_MAX_CENTER_PX * 3 : AUTO_FIT_MAX_CENTER_PX const maxDx = maxPx / v.pixelsPerUnit const maxDy = maxPx / v.pixelsPerUnit const dx = (targetCenterX - v.center.x) * sweepLerp const dy = (targetCenterY - v.center.y) * sweepLerp v.center.x += Math.max(-maxDx, Math.min(maxDx, dx)) v.center.y += Math.max(-maxDy, Math.min(maxDy, dy)) // ── Hard constraint: compass scribing tip must always be visible ── if (compassPhase.tag === 'sweeping') { const radius = compassPhase.radius as number if (radius > 0) { const sweepCenter = getPoint(ctx.constructionRef.current, compassPhase.centerId as string) if (sweepCenter) { const startAngle = compassPhase.startAngle as number const cumulativeSweep = compassPhase.cumulativeSweep as number const tipAngle = startAngle + cumulativeSweep const tipWorldX = sweepCenter.x + Math.cos(tipAngle) * radius const tipWorldY = sweepCenter.y + Math.sin(tipAngle) * radius const tipDx = tipWorldX - v.center.x const tipDy = v.center.y - tipWorldY // screen Y inverted const tipPad = pad * AUTO_FIT_TIP_PAD_FRACTION let tipMaxPpu = v.pixelsPerUnit if (tipDx > 0.001) { const limit = (fitRect.right - tipPad - cssWidth / 2) / tipDx if (limit > 0) tipMaxPpu = Math.min(tipMaxPpu, limit) } else if (tipDx < -0.001) { const limit = (fitRect.left + tipPad - cssWidth / 2) / tipDx if (limit > 0) tipMaxPpu = Math.min(tipMaxPpu, limit) } if (tipDy > 0.001) { const limit = (fitRect.bottom - tipPad - cssHeight / 2) / tipDy if (limit > 0) tipMaxPpu = Math.min(tipMaxPpu, limit) } else if (tipDy < -0.001) { const limit = (fitRect.top + tipPad - cssHeight / 2) / tipDy if (limit > 0) tipMaxPpu = Math.min(tipMaxPpu, limit) } if (tipMaxPpu < v.pixelsPerUnit && tipMaxPpu >= AUTO_FIT_MIN_PPU) { v.pixelsPerUnit = tipMaxPpu } } } } // ── Flag redraw if viewport moved ── if ( Math.abs(v.center.x - prevCx) > 0.001 || Math.abs(v.center.y - prevCy) > 0.001 || Math.abs(v.pixelsPerUnit - prevPpu) > 0.01 ) { ctx.needsDrawRef.current = true } } |