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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 | import { useEffect, useRef, useCallback } from 'react' import type { CoordinatePlaneState, ZoomMode } from './types' import { screenToWorld2D } from '../shared/coordinateConversions' interface UseCoordinatePlaneTouchOptions { stateRef: React.MutableRefObject<CoordinatePlaneState> canvasRef: React.RefObject<HTMLCanvasElement | null> zoomModeRef: React.MutableRefObject<ZoomMode> /** When true, another element (e.g. ruler) has captured the pointer — skip pan/zoom */ pointerCapturedRef?: React.MutableRefObject<boolean> onStateChange: () => void onZoomVelocity?: (velocity: number, focalX: number, focalY: number) => void } // Zoom limits (same as number line) const MIN_PPU = 0.001 const MAX_PPU = 1e14 function clampPPU(ppu: number): number { return Math.max(MIN_PPU, Math.min(MAX_PPU, ppu)) } /** * Hook that attaches touch, mouse, and wheel handlers to a canvas element * for panning and zooming a 2D coordinate plane. * * All math uses absolute anchor-based computations (not deltas) to prevent drift. */ export function useCoordinatePlaneTouch({ stateRef, canvasRef, zoomModeRef, pointerCapturedRef, onStateChange, onZoomVelocity, }: UseCoordinatePlaneTouchOptions) { // Anchor state for single-finger drag const dragAnchorRef = useRef<{ wx: number; wy: number } | null>(null) // Anchor state for two-finger pinch const pinchAnchorsRef = useRef<{ w1: { x: number; y: number } w2: { x: number; y: number } id1: number id2: number } | null>(null) const getCanvasRect = useCallback(() => { return canvasRef.current?.getBoundingClientRect() }, [canvasRef]) useEffect(() => { const canvas = canvasRef.current if (!canvas) return function toWorld(sx: number, sy: number, cw: number, ch: number) { const s = stateRef.current return screenToWorld2D( sx, sy, s.center.x, s.center.y, s.pixelsPerUnit.x, s.pixelsPerUnit.y, cw, ch ) } // --- Touch handlers --- function handleTouchStart(e: TouchEvent) { if (pointerCapturedRef?.current) return e.preventDefault() const rect = getCanvasRect() if (!rect) return const cw = rect.width const ch = rect.height if (e.touches.length === 1) { const sx = e.touches[0].clientX - rect.left const sy = e.touches[0].clientY - rect.top const w = toWorld(sx, sy, cw, ch) dragAnchorRef.current = { wx: w.x, wy: w.y } pinchAnchorsRef.current = null } else if (e.touches.length === 2) { const sx1 = e.touches[0].clientX - rect.left const sy1 = e.touches[0].clientY - rect.top const sx2 = e.touches[1].clientX - rect.left const sy2 = e.touches[1].clientY - rect.top const w1 = toWorld(sx1, sy1, cw, ch) const w2 = toWorld(sx2, sy2, cw, ch) pinchAnchorsRef.current = { w1: { x: w1.x, y: w1.y }, w2: { x: w2.x, y: w2.y }, id1: e.touches[0].identifier, id2: e.touches[1].identifier, } dragAnchorRef.current = null } } function handleTouchMove(e: TouchEvent) { if (pointerCapturedRef?.current) return e.preventDefault() const rect = getCanvasRect() if (!rect) return const cw = rect.width const ch = rect.height const state = stateRef.current const mode = zoomModeRef.current if (e.touches.length === 2 && pinchAnchorsRef.current) { const { w1, w2, id1, id2 } = pinchAnchorsRef.current let touch1: Touch | null = null let touch2: Touch | null = null for (let i = 0; i < e.touches.length; i++) { if (e.touches[i].identifier === id1) touch1 = e.touches[i] if (e.touches[i].identifier === id2) touch2 = e.touches[i] } if (!touch1 || !touch2) return const s1x = touch1.clientX - rect.left const s1y = touch1.clientY - rect.top const s2x = touch2.clientX - rect.left const s2y = touch2.clientY - rect.top const oldPpuX = state.pixelsPerUnit.x const oldPpuY = state.pixelsPerUnit.y if (mode === 'uniform') { // Use euclidean distance ratio for uniform zoom const worldDist = Math.sqrt((w1.x - w2.x) ** 2 + (w1.y - w2.y) ** 2) const screenDist = Math.sqrt((s1x - s2x) ** 2 + (s1y - s2y) ** 2) if (worldDist < 1e-12) { // Anchors too close, just pan const midSx = (s1x + s2x) / 2 const midSy = (s1y + s2y) / 2 const midWx = (w1.x + w2.x) / 2 const midWy = (w1.y + w2.y) / 2 state.center.x = midWx - (midSx - cw / 2) / state.pixelsPerUnit.x state.center.y = midWy + (midSy - ch / 2) / state.pixelsPerUnit.y } else { const newPpu = clampPPU(screenDist / worldDist) state.pixelsPerUnit.x = newPpu state.pixelsPerUnit.y = newPpu // Re-center so w1 stays under touch1 state.center.x = w1.x - (s1x - cw / 2) / newPpu state.center.y = w1.y + (s1y - ch / 2) / newPpu } } else { // Independent mode: solve each axis independently const wdx = w1.x - w2.x const wdy = w1.y - w2.y if (Math.abs(wdx) > 1e-12) { const newPpuX = clampPPU((s1x - s2x) / wdx) state.pixelsPerUnit.x = newPpuX state.center.x = w1.x - (s1x - cw / 2) / newPpuX } if (Math.abs(wdy) > 1e-12) { // Y inversion: screen delta is -(world delta * ppu) const newPpuY = clampPPU(-(s1y - s2y) / wdy) state.pixelsPerUnit.y = newPpuY state.center.y = w1.y + (s1y - ch / 2) / newPpuY } } onStateChange() // Report zoom velocity const ppuAvgOld = (oldPpuX + oldPpuY) / 2 const ppuAvgNew = (state.pixelsPerUnit.x + state.pixelsPerUnit.y) / 2 if (ppuAvgNew !== ppuAvgOld) { const midX = (s1x + s2x) / 2 const midY = (s1y + s2y) / 2 onZoomVelocity?.(Math.log(ppuAvgNew / ppuAvgOld), midX / cw, midY / ch) } } else if (e.touches.length === 1 && dragAnchorRef.current) { const sx = e.touches[0].clientX - rect.left const sy = e.touches[0].clientY - rect.top const anchor = dragAnchorRef.current state.center.x = anchor.wx - (sx - cw / 2) / state.pixelsPerUnit.x state.center.y = anchor.wy + (sy - ch / 2) / state.pixelsPerUnit.y onStateChange() } } function handleTouchEnd(e: TouchEvent) { e.preventDefault() const rect = getCanvasRect() if (!rect) return const cw = rect.width const ch = rect.height if (e.touches.length === 1 && pinchAnchorsRef.current) { // Transition 2 -> 1 finger: re-anchor const t = e.touches[0] const sx = t.clientX - rect.left const sy = t.clientY - rect.top const w = toWorld(sx, sy, cw, ch) dragAnchorRef.current = { wx: w.x, wy: w.y } pinchAnchorsRef.current = null } else if (e.touches.length === 0) { dragAnchorRef.current = null pinchAnchorsRef.current = null } } // --- Mouse handlers --- let mouseAnchor: { wx: number; wy: number } | null = null function handleMouseDown(e: MouseEvent) { if (pointerCapturedRef?.current) return if (e.button !== 0) return const rect = getCanvasRect() if (!rect) return const sx = e.clientX - rect.left const sy = e.clientY - rect.top const w = toWorld(sx, sy, rect.width, rect.height) mouseAnchor = { wx: w.x, wy: w.y } canvas!.style.cursor = 'grabbing' } function handleMouseMove(e: MouseEvent) { if (!mouseAnchor) return const rect = getCanvasRect() if (!rect) return const sx = e.clientX - rect.left const sy = e.clientY - rect.top const state = stateRef.current state.center.x = mouseAnchor.wx - (sx - rect.width / 2) / state.pixelsPerUnit.x state.center.y = mouseAnchor.wy + (sy - rect.height / 2) / state.pixelsPerUnit.y onStateChange() } function handleMouseUp() { mouseAnchor = null if (canvas) canvas.style.cursor = 'grab' } // --- Wheel handler --- function handleWheel(e: WheelEvent) { if (pointerCapturedRef?.current) return e.preventDefault() const rect = getCanvasRect() if (!rect) return const sx = e.clientX - rect.left const sy = e.clientY - rect.top const cw = rect.width const ch = rect.height const state = stateRef.current const mode = zoomModeRef.current // Anchor the world point under the cursor const anchor = toWorld(sx, sy, cw, ch) const zoomFactor = 1.001 ** -e.deltaY const oldPpuX = state.pixelsPerUnit.x const oldPpuY = state.pixelsPerUnit.y if (mode === 'uniform') { // Shift+wheel = X-only, Alt+wheel = Y-only (no-ops in uniform mode) const newPpu = clampPPU(state.pixelsPerUnit.x * zoomFactor) state.pixelsPerUnit.x = newPpu state.pixelsPerUnit.y = newPpu state.center.x = anchor.x - (sx - cw / 2) / newPpu state.center.y = anchor.y + (sy - ch / 2) / newPpu } else { // Independent mode const zoomX = !e.altKey // Alt = Y-only const zoomY = !e.shiftKey // Shift = X-only if (zoomX) { const newPpuX = clampPPU(state.pixelsPerUnit.x * zoomFactor) state.pixelsPerUnit.x = newPpuX state.center.x = anchor.x - (sx - cw / 2) / newPpuX } if (zoomY) { const newPpuY = clampPPU(state.pixelsPerUnit.y * zoomFactor) state.pixelsPerUnit.y = newPpuY state.center.y = anchor.y + (sy - ch / 2) / newPpuY } } onStateChange() const ppuAvgOld = (oldPpuX + oldPpuY) / 2 const ppuAvgNew = (state.pixelsPerUnit.x + state.pixelsPerUnit.y) / 2 onZoomVelocity?.(Math.log(ppuAvgNew / ppuAvgOld), sx / cw, sy / ch) } // Attach listeners canvas.addEventListener('touchstart', handleTouchStart, { passive: false }) canvas.addEventListener('touchmove', handleTouchMove, { passive: false }) canvas.addEventListener('touchend', handleTouchEnd, { passive: false }) canvas.addEventListener('touchcancel', handleTouchEnd, { passive: false }) canvas.addEventListener('mousedown', handleMouseDown) window.addEventListener('mousemove', handleMouseMove) window.addEventListener('mouseup', handleMouseUp) canvas.addEventListener('wheel', handleWheel, { passive: false }) canvas.style.cursor = 'grab' return () => { canvas.removeEventListener('touchstart', handleTouchStart) canvas.removeEventListener('touchmove', handleTouchMove) canvas.removeEventListener('touchend', handleTouchEnd) canvas.removeEventListener('touchcancel', handleTouchEnd) canvas.removeEventListener('mousedown', handleMouseDown) window.removeEventListener('mousemove', handleMouseMove) window.removeEventListener('mouseup', handleMouseUp) canvas.removeEventListener('wheel', handleWheel) } }, [ canvasRef, stateRef, zoomModeRef, pointerCapturedRef, onStateChange, onZoomVelocity, getCanvasRect, ]) } |