import * as Cesium from 'cesium'
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import * as turf from '@turf/turf'
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/**
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* 线缩放通用方法
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* @param data 数据源 格式 [[lng, lat], [lng, lat], [lng, lat]]
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* @param multiple 缩放倍数
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*/
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export const lineTransformScale = (data, multiple = 3) => {
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const line = turf.lineString(data)
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const scaledLine = turf.transformScale(line, multiple)
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return scaledLine.geometry.coordinates
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}
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/**
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* 盒子缩放通用方法
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* @param data 数据源 格式 [[lng, lat], [lng, lat], [lng, lat]]
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* @param multiple 缩放倍数
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*/
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export const boxTransformScale = (data, multiple = 3) => {
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const line = turf.lineString(data)
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const bbox = turf.bbox(line)
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const bboxPolygon = turf.bboxPolygon(bbox)
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const scaledPolygon = turf.transformScale(bboxPolygon, multiple)
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return turf.bbox(scaledPolygon)
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}
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/**
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* 获取盒子中心点
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* @param {*} data
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* @returns
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*/
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export const boxCenterPosition = (data) => {
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const line = turf.lineString(data)
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const bbox = turf.bbox(line)
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const bboxPolygon = turf.bboxPolygon(bbox)
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return turf.center(bboxPolygon).geometry.coordinates
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}
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/**
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* 获取多点间，最大点到点距离
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* @param data 数据源 格式 [[lng, lat], [lng, lat], [lng, lat]]
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* @param center 面的中心点 格式 [lng, lat]
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*/
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export const morePointMaxLength = (data, center, type = 1) => {
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if (type === 2) {
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let maxLength = 0
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const centerCartesian = Cesium.Cartesian3.fromDegrees(center[0], center[1], 0)
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data.forEach(pos => {
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const posCartesian = Cesium.Cartesian3.fromDegrees(pos[0], pos[1], pos[2] || 0)
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const distance = Cesium.Cartesian3.distance(centerCartesian, posCartesian)
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if (distance > maxLength) {
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maxLength = distance
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}
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})
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return maxLength
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}
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const arr = data.reduce((pre, cur) => {
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let from = turf.point(center)
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let to = turf.point(cur)
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let options = { units: "kilometers" }
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let distance = turf.distance(from, to, options) // 60.35329997171415
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pre.push(distance)
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return pre
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}, [])
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return (Math.max(...arr) * 1000 + 500)
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}
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