define(function () {
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/**
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*数学工具类
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*@memberof Cesium
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*@constructor
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*/
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function MathUtil() { }
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/**
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*
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* 判断给定对象是否为数组
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*@param {Object|*}obj
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*/
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MathUtil.isArray = function (obj) {
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return Object.prototype.toString.call(obj) === '[object Array]';
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}
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/**
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* 计算最大值
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* @function MathUtil.getMinMax
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* @param {Array.<Number>} arr 数组
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* @param {Number}invalidValue 无效值
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* @returns {Number}
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*/
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MathUtil.getMinMax = function (arr, invalidValue) {
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// if (!MathUtil.isArray(arr)) {
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// throw new Error("参数不是数组");
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// }
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var hasInvalidValueParams = typeof invalidValue !== 'undefined' && invalidValue != null;
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var min = Number.MAX_VALUE, max = -Number.MAX_VALUE;
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for (var i = 0; i < arr.length; i++) {
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if (!MathUtil.isArray(arr[i]) && !arr[i].length
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&& (isNaN(arr[i]) || (hasInvalidValueParams && invalidValue == arr[i]))) {
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continue;
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}
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if (arr[i] instanceof Array || MathUtil.isArray(arr[i]) || arr[i].length) {
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var minMax = MathUtil.getMinMax(arr[i], invalidValue);
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min = Math.min(minMax[0], min);
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max = Math.max(minMax[1], max);
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} else {
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var v=parseFloat( arr[i])+0.0000001;
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min = Math.min(arr[i], min);
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if (v-max>0) {
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max = v;
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}
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// max = Math.max(v, max);
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}
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}
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return [min, max];
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}
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/**
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*地球半径
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*@Object MathUtil.EARTH_RADIUS
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*/
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MathUtil.EARTH_RADIUS = 6378.137; //地球半径
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/**
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*角度转弧度
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*@param {Number} d
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*/
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MathUtil.rad = function (d) {
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return d * Math.PI / 180.0;
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}
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/**
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* 计算距离
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* @param {Array.<Number>} arr 数组
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* @returns {Number}
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*/
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MathUtil.getDistance = function (lat1, lng1, lat2, lng2) {
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var radLat1 = MathUtil.rad(lat1);
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var radLat2 = MathUtil.rad(lat2);
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var a = radLat1 - radLat2;
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var b = MathUtil.rad(lng1) - MathUtil.rad(lng2);
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var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) +
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Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
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s = s * MathUtil.EARTH_RADIUS;
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s = Math.round(s * 10000) / 10000;
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return s;
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}
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/**
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* 计算距离
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* @param {Array.<Number>} arr 数组
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* @returns {Number}
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*/
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MathUtil.computeLength = function (Points_lc) {
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var len = 0;
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for (var i = 1; i < Points_lc.length; i++) {
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var p1 = Points_lc[i - 1], p2 = Points_lc[i];
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len += MathUtil.getDistance(p1.lat, p1.lon, p2.lat, p2.lon);
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}
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return len;
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}
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/**
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* 计算距离
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* @param {Array.<Number>} arr 数组
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* @returns {Number}
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*/
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MathUtil.computeLength2 = function (Points_lc) {
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var len = 0;
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for (var i = 1; i < Points_lc.length; i++) {
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var p1 = Points_lc[i - 1], p2 = Points_lc[i];
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len += Cesium.Cartesian3.distance(p1, p2);
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}
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return len;
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}
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/**
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* 计算平均值
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* @param {Array.<Number>} arr 数组
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* @returns {Number}
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*/
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MathUtil.avrage = function (arr) {
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/// <summary>计算平均值</summary>
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/// <param name="arr" type="Array">数组</param>
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var ret = 0;
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for (var i = 0; i < arr.length; i++) {
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ret += arr[i];
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}
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ret = ret / arr.length;
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return ret;
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}
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/**
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* 计算标准差
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* @param {Array.<Number>} arr 数组
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* @returns {Number}
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*/
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MathUtil.standardDeviation = function (arr) {
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/// <summary>计算标准差</summary>
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/// <param name="arr" type="Array">数组</param>
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var u = MathUtil.avrage(arr);
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var ret = 0;
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for (var i = 0; i < arr.length; i++) {
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ret += (arr[i] - u) * (arr[i] - u);
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}
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ret = ret / arr.length;
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ret = Math.sqrt(ret);
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return ret;
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}
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/**
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*风场u、v分量转为风速大小（spr）和方向（dir）
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*@param {Number}u
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*@param {Number}v
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*@param {Array<Number>}outWin
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*/
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MathUtil.uv2wind = function uv2wind(u, v, outWin) {
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var spd = Math.sqrt(u * u + v * v)
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var tmp = 0.0 - Math.atan2(v, u) * 180.0 / Map.PI
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var dir = tmp % 360.0;
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outWin[0] = spd;
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outWin[1] = dir;
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}
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/**
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*风速大小（spr）和方向（dir）转为风场u、v分量
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*@param {Number}spd
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*@param {Number}dir
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*@param {Array<Number>}outUV
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*/
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MathUtil.wind2uv = function wind2uv(spd, dir, outUV) {
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var tmp = (0.0 - dir) * Math.PI / 180.0;
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outUV[0] = spd * Math.cos(tmp);
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outUV[1] = spd * Math.sin(tmp);
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}
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return MathUtil;
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})
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