145 lines
4.8 KiB
JavaScript
145 lines
4.8 KiB
JavaScript
import Tools from "../../../Tools";
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class Section extends Tools {
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/**
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* @constructor 剖切
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* @param sdk
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* @param tiles3d {object} 3dtiles对象
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* @param {Array.<object>} options.positions 经纬度[{lon,lat,alt},...]
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* @param options.regionsType=false 裁剪类型 false:裁剪内部，true:裁剪外部
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* **/
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constructor(sdk, tiles3d, options = {}) {
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super(sdk, options)
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this.viewer = sdk.viewer
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this.tiles3d = tiles3d
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this.options = { ...options }
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this.options.regionsType = this.options.regionsType || false
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YJ.Analysis.SectionResults.push(this)
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this.Planes = []
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Section.start(this)
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}
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get regionsType() {
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return this.options.regionsType
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}
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set regionsType(v) {
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this.options.regionsType = v
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if (this.Planes.length > 0) {
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this.Planes = []
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Section.planeCollection(this)
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}
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}
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static start(that) {
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let positions = that.options.positions || []
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if(!that.isConvex(positions)) {
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window.ELEMENT && window.ELEMENT.Message({
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message: '不支持凹多边形',
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type: 'warning',
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duration: 1500
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});
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console.log('不支持凹多边形')
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return
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}
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that.inverseTransform = getInverseTransform(that.tiles3d)
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that.Planes = []
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let array = []
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if (positions.length > 0) {
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for (let i = 0; i < positions.length; i++) {
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array.push([positions[i].lng, positions[i].lat])
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}
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array.push([positions[0].lng, positions[0].lat])
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that.isClockwise = turf.booleanClockwise(turf.lineString(array));
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}
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Section.planeCollection(that)
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function getInverseTransform(tileSet) {
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let transform
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const tmp = tileSet.root.transform
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if ((tmp && tmp.equals(Cesium.Matrix4.IDENTITY)) || !tmp) {
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transform = Cesium.Transforms.eastNorthUpToFixedFrame(tileSet.boundingSphere.center)
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} else {
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transform = Cesium.Matrix4.fromArray(tileSet.root.transform)
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}
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return Cesium.Matrix4.inverseTransformation(transform, new Cesium.Matrix4())
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}
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}
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static planeCollection(that) {
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let positions = that.options.positions || []
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if (that.regionsType == that.isClockwise) {
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for (let i = 0; i < positions.length; i++) {
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if (i === (positions.length - 1)) {
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that.Planes.push(createPlane(positions[i], positions[0], that.inverseTransform))
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} else {
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that.Planes.push(createPlane(positions[i], positions[i + 1], that.inverseTransform))
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}
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}
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}
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else {
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for (let i = positions.length - 1; i >= 0; i--) {
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if (i === 0) {
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that.Planes.push(createPlane(positions[i], positions[positions.length - 1], that.inverseTransform))
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} else {
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that.Planes.push(createPlane(positions[i], positions[i - 1], that.inverseTransform))
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}
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}
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}
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if(that.tiles3d.clippingPlanes) {
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that.tiles3d.clippingPlanes.removeAll()
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for(let i=0;i<that.Planes.length;i++) {
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that.tiles3d.clippingPlanes.add(that.Planes[i])
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}
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that.tiles3d.clippingPlanes.enabled = true
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}
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else {
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const PlaneCollection = new Cesium.ClippingPlaneCollection({
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planes: that.Planes,
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enabled: true,
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unionClippingRegions: that.regionsType,
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edgeColor: Cesium.Color.WHITE,
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edgeWidth: 1,
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})
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that.tiles3d.clippingPlanes = PlaneCollection
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}
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function createPlane(p1, p2, inverseTransform) {
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// 将仅包含经纬度信息的p1,p2，转换为相应坐标系的cartesian3对象
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const p1C3 = getOriginCoordinateSystemPoint(p1, inverseTransform)
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const p2C3 = getOriginCoordinateSystemPoint(p2, inverseTransform)
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// 定义一个垂直向上的向量up
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const up = new Cesium.Cartesian3(0, 0, 10)
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// right 实际上就是由p1指向p2的向量
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const right = Cesium.Cartesian3.subtract(p2C3, p1C3, new Cesium.Cartesian3())
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// 计算normal， right叉乘up，得到平面法向量，这个法向量指向right的右侧
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let normal = Cesium.Cartesian3.cross(right, up, new Cesium.Cartesian3())
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normal = Cesium.Cartesian3.normalize(normal, normal)
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// 由于已经获得了法向量和过平面的一点，因此可以直接构造Plane,并进一步构造ClippingPlane
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const planeTmp = Cesium.Plane.fromPointNormal(p1C3, normal)
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return Cesium.ClippingPlane.fromPlane(planeTmp)
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}
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function getOriginCoordinateSystemPoint(point, inverseTransform) {
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const val = Cesium.Cartesian3.fromDegrees(point.lng, point.lat)
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return Cesium.Matrix4.multiplyByPoint(
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inverseTransform, val, new Cesium.Cartesian3(0, 0, 0))
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}
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}
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destroy() {
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this.Planes = []
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// this.tiles3d.clippingPlanes = new Cesium.ClippingPlaneCollection()
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if(this.tiles3d.clippingPlanes) {
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this.tiles3d.clippingPlanes.enabled = false
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this.tiles3d.clippingPlanes.removeAll()
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}
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}
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}
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export default Section; |