125 lines
3.6 KiB
JavaScript
125 lines
3.6 KiB
JavaScript
/**
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* Created by bingqx on 2016/12/25.
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*/
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'use strict';
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const {Cartesian3, Cartographic, WebMercatorProjection, SceneTransforms, CesiumMath} = require('cesium');
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/**
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* 坐标转换类
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* @param {Object} viewer 地球容器
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* @constructor
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*/
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function CoorTrans(viewer) {
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this._viewer = viewer;
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this._wmp = new WebMercatorProjection();
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}
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/**
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* 屏幕坐标转世界坐标
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* @param {Number} [screenX] 屏幕坐标x
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* @param {Number} [screenY] 屏幕坐标y
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* @returns {Cartesian3} 世界坐标
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*/
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CoorTrans.prototype.fromScreenToCartesian3 = function (screenX, screenY) {
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let pick = new Cartesian2(screenX, screenY);
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if (this._viewer.scene.mode === 3) {
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return this._viewer.scene.globe.pick(this._viewer.camera.getPickRay(pick), this._viewer.scene);
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} else {
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return this._viewer.camera.pickEllipsoid(pick, this._viewer.scene.globe.ellipsoid);
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}
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};
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/**
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* 世界坐标转地理坐标（弧度）
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* @param {Cartesian3} [cartesian] 世界坐标
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* @returns {Cartographic} 地理坐标（弧度）
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*/
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CoorTrans.prototype.fromCartesian3ToCartographic = function (cartesian) {
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return this._viewer.scene.globe.ellipsoid.cartesianToCartographic(cartesian);
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};
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/**
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* 世界坐标转屏幕坐标
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* @param {Cartesian3} [cartesian] 世界坐标
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* @returns {Cartesian2} 屏幕坐标
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*/
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CoorTrans.prototype.fromCartesian3ToScreen = function (cartesian) {
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return SceneTransforms.wgs84ToWindowCoordinates(this._viewer.scene, cartesian);
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};
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/**
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* 世界坐标转经纬度坐标
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* @param {Cartesian3} cartesian 世界坐标
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* @returns {Object} 经纬度坐标
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*/
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CoorTrans.prototype.fromCartesian3ToDegree = function (cartesian) {
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let cartographic = this.fromCartesian3ToCartographic(cartesian);
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return this.fromCartographicToDegree(cartographic)
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};
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/**
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* 地理坐标（弧度）转经纬度坐标
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* @param {Cartographic} [cartographic] 地理坐标（弧度）
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* @returns {Object} 经纬度坐标
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*/
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CoorTrans.prototype.fromCartographicToDegree = function (cartographic) {
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return {
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"lon": CesiumMath.toDegrees(cartographic.longitude),
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"lat": CesiumMath.toDegrees(cartographic.latitude),
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"height": cartographic.height
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}
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};
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/**
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* 地理坐标（弧度）转世界坐标
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* @param {Cartographic} [cartographic] 地理坐标（弧度）
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* @returns {Cartesian3} 世界坐标
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*/
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CoorTrans.prototype.fromCartographicToCartesian3 = function (cartographic) {
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return this._viewer.scene.globe.ellipsoid.cartographicToCartesian(cartographic);
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};
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/**
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* 经纬度坐标转地理坐标（弧度）
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* @param {Object} [degrees] 经纬度坐标
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* @returns {Cartographic} 地理坐标（弧度）
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*/
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CoorTrans.prototype.fromDegreesToCartographic = function (degrees) {
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return Cartographic.fromDegrees(degrees.lon, degrees.lat, degrees.height);
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};
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/**
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* 经纬度转世界坐标
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* @param {Object} [degrees] 经纬度坐标
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* @returns {Cartesian3} 世界坐标
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*/
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CoorTrans.prototype.fromDegreesToCartesian3 = function (degrees) {
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return Cartesian3.fromDegrees(degrees.lon, degrees.lat, degrees.height);
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};
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/**
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* WGS84坐标转墨卡托
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* @param {Cartographic} cartographic 经纬度（弧度）
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* @returns {Cartesian3} 墨卡托坐标，单位米
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*/
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CoorTrans.prototype.fromWGS84ToMercator = function (cartographic) {
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return this._wmp.project(cartographic);
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};
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/**
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* 墨卡托坐标转WGS84
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* @param {Cartesian3} cartesian 墨卡托坐标，单位米，例如new Cartesian3(x,y,0)
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* @returns {Cartographic} 经纬度（弧度）
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*/
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CoorTrans.prototype.fromMercatorToWGS84 = function (cartesian) {
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return this._wmp.unproject(cartesian)
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};
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module.exports = {
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CoorTrans: CoorTrans
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};
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