181 lines
8.0 KiB
JavaScript
181 lines
8.0 KiB
JavaScript
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var SysMathTool = (
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function () {
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var DeltaDegree = 0.00001;//插值间隔 单位度
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var DeltaRadian = 0.00001 * Math.PI / 180.0; //Cesium.Math.RADIANS_PER_DEGREE
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function CheckLonDegree(value) {
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if (value > 180 || value < -180) {
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return false;
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}
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return true;
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}
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function CheckLonRadian(value) {
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if (value > Math.PI || value < -Math.PI) {
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return false;
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}
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return true;
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}
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function CheckLatDegree(value) {
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if (value > 90 || value < -90) {
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return false;
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}
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return true;
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}
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function CheckLatRadian(value) {
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if (value > Math.PI / 2.0 || value < -Math.PI / 2.0) {
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return false;
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}
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return true;
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}
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function _() {
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}
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_.GetDeltaDegree = function () {
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return DeltaDegree;
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}
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_.GetDeltaRadian = function () {
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return DeltaRadian;
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}
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/*
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线段插值
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经纬度坐标插值
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start.lon start.lat 单位:度
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return [[lon,lat],...]
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*/
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_.InterpolateLineLonlat = function (start, end) {
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if (start && end) { } else { return null; }
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if (start.lon && start.lat && end.lon && end.lat) { } else { return null; }
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if (CheckLonDegree(start.lon) && CheckLonDegree(end.lon) && CheckLatDegree(start.lat) && CheckLatDegree(end.lat)) { } else { return null; }
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var result = [];
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result.push([start.lon, start.lat]);
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var interval = Math.sqrt(Math.pow((end.lon - start.lon), 2) + Math.pow((end.lat - start.lat), 2));
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if (interval <= DeltaDegree) {
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//小于最小间隔
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result.push([end.lon, end.lat]);
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return result;
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} else {
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var num = interval / DeltaDegree;
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var stepLon = (end.lon - start.lon) / num;
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var stepLat = (end.lat - start.lat) / num;
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for (var i = 0; i < num; i++) {
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var lon = start.lon + (i + 1) * stepLon;
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var lat = start.lat + (i + 1) * stepLat;
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result.push([lon, lat]);
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}
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}
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return result;
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}
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/*
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线段插值
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经纬度坐标插值
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Cartographic start.longitude start.latitude 单位:弧度
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return [Cartographic,...]
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*/
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_.InterpolateLineCartographic = function (start, end, _Delta) {
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if (start && end) { } else { return null; }
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if (start.longitude && start.latitude && end.longitude && end.latitude) { } else { return null; }
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var result = [];
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//开始点
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result.push(new Cesium.Cartographic(start.longitude, start.latitude));
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var interval = Math.sqrt(Math.pow((end.longitude - start.longitude), 2) + Math.pow((end.latitude - start.latitude), 2));
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var delta = _Delta && (typeof _Delta === 'number') ? _Delta : DeltaRadian;
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if (interval <= delta) {
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//小于最小间隔
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result.push(new Cesium.Cartographic(end.longitude, end.latitude));
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return result;
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} else {
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var num = interval / delta;
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var stepLon = (end.longitude - start.longitude) / num;
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var stepLat = (end.latitude - start.latitude) / num;
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for (var i = 0; i < num; i++) {
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var lon = start.longitude + (i + 1) * stepLon;
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var lat = start.latitude + (i + 1) * stepLat;
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result.push(new Cesium.Cartographic(lon, lat));//与最后一个点有偏差
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}
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result.push(new Cesium.Cartographic(end.longitude, end.latitude, end.height));
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}
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return result;
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}
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/*
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线段插值
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经纬度高程插值
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Cartographic start.longitude start.latitude 单位:弧度 start.height 高程单位m
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return [Cartographic,...]
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*/
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_.InterpolateLineHeightCartographic = function (start, end) {
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if (start && end) { } else { return null; }
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if (start.longitude && start.latitude && end.longitude && end.latitude) { } else { return null; }
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var result = [];
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result.push(new Cesium.Cartographic(start.longitude, start.latitude, start.height));
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var interval = Math.sqrt(Math.pow((end.longitude - start.longitude), 2) + Math.pow((end.latitude - start.latitude), 2));
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if (interval <= DeltaRadian) {
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//小于最小间隔
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result.push(new Cesium.Cartographic(end.longitude, end.latitude, end.height));
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return result;
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} else {
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var num = interval / DeltaRadian;
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var stepLon = (end.longitude - start.longitude) / num;
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var stepLat = (end.latitude - start.latitude) / num;
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var stepHeight = (end.height - start.height) / num;
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for (var i = 0; i < num; i++) {
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var lon = start.longitude + (i + 1) * stepLon;
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var lat = start.latitude + (i + 1) * stepLat;
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var hieght = start.height + (i + 1) * stepHeight;
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result.push(new Cesium.Cartographic(lon, lat, hieght));
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}
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result.push(new Cesium.Cartographic(end.longitude, end.latitude, end.height));
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}
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return result;
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}
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/*
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线段插值
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经纬度高程插值
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Cartographic start.longitude start.latitude 单位:弧度 start.height 高程单位m
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num:分总段数 传入数组长度-1
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index:获取到第index点的所有插值 0点是开始点
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return [Cartographic,...]
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*/
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_.Interpolate2IndexLineHeightCartographic = function (start, end, num, curIndex) {
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if (start && end) { } else { return null; }
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if (start.longitude && start.latitude && end.longitude && end.latitude) { } else { return null; }
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var result = [];
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result.push(new Cesium.Cartographic(start.longitude, start.latitude, start.height));
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var stepLon = (end.longitude - start.longitude) / num;
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var stepLat = (end.latitude - start.latitude) / num;
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var stepHeight = (end.height - start.height) / num;
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for (var i = 0; i < curIndex; i++) {
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var lon = start.longitude + (i + 1) * stepLon;
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var lat = start.latitude + (i + 1) * stepLat;
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var hieght = start.height + (i + 1) * stepHeight;
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result.push(new Cesium.Cartographic(lon, lat, hieght));
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}
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//result.push(new Cesium.Cartographic(end.longitude, end.latitude, end.height));
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return result;
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}
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/*
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线段插值 指定第index值
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经纬度高程插值
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Cartographic start.longitude start.latitude 单位:弧度 start.height 高程单位m
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num:分总段数 传入数组长度-1
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index:获取第index个插值点 0点是开始点
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return Cartographic
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*/
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_.InterpolateIndexLineHeightCartographic = function (start, end, num, index) {
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if (start && end) { } else { return null; }
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if (start.longitude && start.latitude && end.longitude && end.latitude) { } else { return null; }
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//var delta = _Delta && (typeof _Delta === 'number') ? _Delta : DeltaRadian;
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var stepLon = (end.longitude - start.longitude) / num;
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var stepLat = (end.latitude - start.latitude) / num;
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var stepHeight = (end.height - start.height) / num;
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var lon = start.longitude + index * stepLon;
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var lat = start.latitude + index * stepLat;
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var hieght = start.height + index * stepHeight;
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var result = new Cesium.Cartographic(lon, lat, hieght);
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return result;
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}
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return _;
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})();
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