| 1 | 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{\n BBox,\n Coord,\n degreesToRadians,\n isObject,\n radiansToLength,\n Units,\n} from '@turf/helpers';\n\nexport type IBounds = [[number, number], [number, number]];\ninterface ILngLat {\n lng: number;\n lat: number;\n}\ninterface IPoint {\n x: number;\n y: number;\n}\nconst originShift = (2 * Math.PI * 6378137) / 2.0;\ntype Point = number[];\n/**\n * 计算地理数据范围\n * @param {dataArray} data 地理坐标数据\n * @return {Array} dataExtent\n */\nexport function extent(data: any[]): BBox {\n const dataExtent: BBox = [Infinity, Infinity, -Infinity, -Infinity];\n data.forEach((item) => {\n const { coordinates } = item;\n caculExtent(dataExtent, coordinates);\n });\n return dataExtent;\n}\nfunction caculExtent(dataExtent: BBox, coords: any[]) {\n if (Array.isArray(coords[0])) {\n coords.forEach((coord) => {\n caculExtent(dataExtent, coord);\n });\n } else {\n if (dataExtent[0] > coords[0]) {\n dataExtent[0] = coords[0];\n }\n if (dataExtent[1] > coords[1]) {\n dataExtent[1] = coords[1];\n }\n if (dataExtent[2] < coords[0]) {\n dataExtent[2] = coords[0];\n }\n if (dataExtent[3] < coords[1]) {\n dataExtent[3] = coords[1];\n }\n }\n return dataExtent;\n}\n\nexport function tranfrormCoord(data: any[], cb: (item: any[]) => any) {\n return transform(data, cb);\n}\nfunction transform(item: any[], cb: (item: any[]) => any): any {\n if (Array.isArray(item[0])) {\n return item.map((coord) => {\n return transform(coord, cb);\n });\n }\n return cb(item);\n}\nexport function lngLatToMeters(lnglat: Point): Point;\nexport function lngLatToMeters(\n lnglat: Point,\n validate: boolean = true,\n accuracy = { enable: true, decimal: 1 },\n) {\n lnglat = validateLngLat(lnglat, validate);\n const lng = lnglat[0];\n const lat = lnglat[1];\n let x = (lng * originShift) / 180.0;\n let y =\n Math.log(Math.tan(((90 + lat) * Math.PI) / 360.0)) / (Math.PI / 180.0);\n y = (y * originShift) / 180.0;\n if (accuracy.enable) {\n x = Number(x.toFixed(accuracy.decimal));\n y = Number(y.toFixed(accuracy.decimal));\n }\n return lnglat.length === 3 ? [x, y, lnglat[2]] : [x, y];\n}\n\nexport function metersToLngLat(meters: Point, decimal = 6) {\n const x = meters[0];\n const y = meters[1];\n let lng = (x / originShift) * 180.0;\n let lat = (y / originShift) * 180.0;\n lat =\n (180 / Math.PI) *\n (2 * Math.atan(Math.exp((lat * Math.PI) / 180.0)) - Math.PI / 2.0);\n if (decimal !== undefined && decimal !== null) {\n lng = Number(lng.toFixed(decimal));\n lat = Number(lat.toFixed(decimal));\n }\n return meters.length === 3 ? [lng, lat, meters[2]] : [lng, lat];\n}\nexport function longitude(lng: number) {\n if (lng === undefined || lng === null) {\n throw new Error('lng is required');\n }\n\n // lngitudes cannot extends beyond +/-90 degrees\n if (lng > 180 || lng < -180) {\n lng = lng % 360;\n if (lng > 180) {\n lng = -360 + lng;\n }\n if (lng < -180) {\n lng = 360 + lng;\n }\n if (lng === 0) {\n lng = 0;\n }\n }\n return lng;\n}\nexport function latitude(lat: number) {\n if (lat === undefined || lat === null) {\n throw new Error('lat is required');\n }\n\n if (lat > 90 || lat < -90) {\n lat = lat % 180;\n if (lat > 90) {\n lat = -180 + lat;\n }\n if (lat < -90) {\n lat = 180 + lat;\n }\n if (lat === 0) {\n lat = 0;\n }\n }\n return lat;\n}\nexport function validateLngLat(lnglat: Point, validate: boolean): Point {\n if (validate === false) {\n return lnglat;\n }\n\n const lng = longitude(lnglat[0]);\n let lat = latitude(lnglat[1]);\n\n // Global Mercator does not support latitudes within 85 to 90 degrees\n if (lat > 85) {\n lat = 85;\n }\n if (lat < -85) {\n lat = -85;\n }\n return lnglat.length === 3 ? [lng, lat, lnglat[2]] : [lng, lat];\n}\nexport function aProjectFlat(lnglat: number[]) {\n const maxs = 85.0511287798;\n const lat = Math.max(Math.min(maxs, lnglat[1]), -maxs);\n const scale = 256 << 20;\n let d = Math.PI / 180;\n let x = lnglat[0] * d;\n let y = lat * d;\n y = Math.log(Math.tan(Math.PI / 4 + y / 2));\n\n const a = 0.5 / Math.PI;\n const b = 0.5;\n const c = -0.5 / Math.PI;\n d = 0.5;\n x = scale * (a * x + b);\n y = scale * (c * y + d);\n return [Math.floor(x), Math.floor(y)];\n}\nexport function unProjectFlat(px: number[]): [number, number] {\n const a = 0.5 / Math.PI;\n const b = 0.5;\n const c = -0.5 / Math.PI;\n let d = 0.5;\n const scale = 256 << 20;\n let [x, y] = px;\n x = (x / scale - b) / a;\n y = (y / scale - d) / c;\n y = (Math.atan(Math.pow(Math.E, y)) - Math.PI / 4) * 2;\n d = Math.PI / 180;\n const lat = y / d;\n const lng = x / d;\n return [lng, lat];\n}\nexport function lnglatDistance(\n coordinates1: [number, number],\n coordinates2: [number, number],\n units?: Units,\n): number {\n const dLat = degreesToRadians(coordinates2[1] - coordinates1[1]);\n const dLon = degreesToRadians(coordinates2[0] - coordinates1[0]);\n const lat1 = degreesToRadians(coordinates1[1]);\n const lat2 = degreesToRadians(coordinates2[1]);\n const a =\n Math.pow(Math.sin(dLat / 2), 2) +\n Math.pow(Math.sin(dLon / 2), 2) * Math.cos(lat1) * Math.cos(lat2);\n\n return radiansToLength(\n 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)),\n (units = 'meters'),\n );\n}\n\nexport function project(lnglat: [number, number]) {\n const d = Math.PI / 180;\n const max = 85.0511287798;\n const earthRadius = 6378137;\n const lat = Math.max(Math.min(max, lnglat[1]), -max);\n const sin = Math.sin(lat * d);\n const x = earthRadius * lnglat[0] * d;\n const y = (earthRadius * Math.log((1 + sin) / (1 - sin))) / 2;\n\n return [x, y];\n}\n\nexport function padBounds(b: IBounds, bufferRatio: number): IBounds {\n const heightBuffer = Math.abs(b[1][1] - b[0][1]) * bufferRatio;\n const widthBuffer = Math.abs(b[1][0] - b[0][0]) * bufferRatio;\n\n return [\n [b[0][0] - widthBuffer, b[0][1] - heightBuffer],\n [b[1][0] + widthBuffer, b[1][1] + heightBuffer],\n ];\n}\n/**\n * b1 包含 b2 返回 true 否则false\n * @param b1 bounds1\n * @param b2 bounds2\n */\nexport function boundsContains(b1: IBounds, b2: IBounds): boolean {\n return (\n b1[0][0] <= b2[0][0] &&\n b1[0][1] <= b2[0][1] &&\n b1[1][0] >= b2[1][0] &&\n b1[1][1] >= b2[1][1]\n );\n}\n/**\n * bbox 转换为Bounds\n * @param b1 bbox\n *\n */\nexport function bBoxToBounds(b1: BBox): IBounds {\n return [\n [b1[0], b1[1]],\n [b1[2], b1[3]],\n ];\n}\n"],"file":"geo.js"} |