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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 | import { useEffect, useRef, useCallback } from 'react' import type { EuclidViewportState } from '../types' import { screenToWorld2D } from '../../shared/coordinateConversions' interface UseEuclidTouchOptions { viewportRef: React.MutableRefObject<EuclidViewportState> canvasRef: React.RefObject<HTMLCanvasElement | null> /** When true, a tool has captured the pointer — skip pan/zoom */ pointerCapturedRef: React.MutableRefObject<boolean> onViewportChange: () => void /** When true, pan/zoom gestures are completely disabled */ panZoomDisabledRef: React.MutableRefObject<boolean> } const MIN_PPU = 1 const MAX_PPU = 1000 function clampPPU(ppu: number): number { return Math.max(MIN_PPU, Math.min(MAX_PPU, ppu)) } /** * Pan/zoom hook for the Euclid canvas. * Uniform zoom only (single pixelsPerUnit). * Adapted from useCoordinatePlaneTouch.ts with simplifications. */ export function useEuclidTouch({ viewportRef, canvasRef, pointerCapturedRef, onViewportChange, panZoomDisabledRef, }: UseEuclidTouchOptions) { const dragAnchorRef = useRef<{ wx: number; wy: number } | null>(null) 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 v = viewportRef.current return screenToWorld2D( sx, sy, v.center.x, v.center.y, v.pixelsPerUnit, v.pixelsPerUnit, cw, ch ) } // --- Touch handlers --- function handleTouchStart(e: TouchEvent) { if (panZoomDisabledRef.current) return 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 (panZoomDisabledRef.current) return if (pointerCapturedRef.current) return e.preventDefault() const rect = getCanvasRect() if (!rect) return const cw = rect.width const ch = rect.height const v = viewportRef.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 // 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) { const midSx = (s1x + s2x) / 2 const midSy = (s1y + s2y) / 2 const midWx = (w1.x + w2.x) / 2 const midWy = (w1.y + w2.y) / 2 v.center.x = midWx - (midSx - cw / 2) / v.pixelsPerUnit v.center.y = midWy + (midSy - ch / 2) / v.pixelsPerUnit } else { const newPpu = clampPPU(screenDist / worldDist) v.pixelsPerUnit = newPpu v.center.x = w1.x - (s1x - cw / 2) / newPpu v.center.y = w1.y + (s1y - ch / 2) / newPpu } onViewportChange() } 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 v.center.x = anchor.wx - (sx - cw / 2) / v.pixelsPerUnit v.center.y = anchor.wy + (sy - ch / 2) / v.pixelsPerUnit onViewportChange() } } 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) { 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 (panZoomDisabledRef.current) return 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 v = viewportRef.current v.center.x = mouseAnchor.wx - (sx - rect.width / 2) / v.pixelsPerUnit v.center.y = mouseAnchor.wy + (sy - rect.height / 2) / v.pixelsPerUnit onViewportChange() } function handleMouseUp() { mouseAnchor = null if (canvas) canvas.style.cursor = 'grab' } // --- Wheel handler --- function handleWheel(e: WheelEvent) { if (panZoomDisabledRef.current) return 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 v = viewportRef.current const anchor = toWorld(sx, sy, cw, ch) const zoomFactor = 1.001 ** -e.deltaY const newPpu = clampPPU(v.pixelsPerUnit * zoomFactor) v.pixelsPerUnit = newPpu v.center.x = anchor.x - (sx - cw / 2) / newPpu v.center.y = anchor.y + (sy - ch / 2) / newPpu onViewportChange() } // 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 }) 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, viewportRef, pointerCapturedRef, onViewportChange, getCanvasRect, panZoomDisabledRef, ]) } |