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MapCalculateUtil.js
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338 lines (324 loc) · 9.25 KB
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import { Unit } from '../REST';
/**
* @private
* @function getMeterPerMapUnit
* @description 单位换算，把米|度|千米|英寸|英尺换算成米。
* @category BaseTypes Util
* @param {string} mapUnit 需要换算的地图单位。
* @returns {number} 返回地图的距离单位。
* @usage
* ```
* // 浏览器
* <script type="text/javascript" src="{cdn}"></script>
* <script>
* const result = {namespace}.getMeterPerMapUnit(mapUnit);
*
* </script>
*
* // ES6 Import
* import { getMeterPerMapUnit } from '{npm}';
*
* const result = getMeterPerMapUnit(mapUnit);
* ```
*/
export var getMeterPerMapUnit = function(mapUnit) {
var meterPerMapUnit;
if(!mapUnit){
return meterPerMapUnit;
}
var earchRadiusInMeters = 6378137;
if (['m','meter','meters'].indexOf(mapUnit.toLocaleLowerCase())>-1) {
meterPerMapUnit = 1;
} else if (['degrees','deg','degree','dd'].indexOf(mapUnit.toLocaleLowerCase())>-1) {
// 每度表示多少米。
meterPerMapUnit = (Math.PI * 2 * earchRadiusInMeters) / 360;
} else if (mapUnit === Unit.KILOMETER) {
meterPerMapUnit = 1000;
} else if (mapUnit === Unit.INCH) {
meterPerMapUnit = 2.5399999918e-2;
} else if (mapUnit === Unit.FOOT) {
meterPerMapUnit = 0.3048;
}
return meterPerMapUnit;
};
/**
* @private
* @function getSquareMeterPerMapUnit
* @description 单位换算，把平方米|平方千米|平方英寸|平方英尺换算成平方米。
* @category BaseTypes Util
* @param {string} mapUnit 需要换算的地图面积单位。
* @returns {number} 返回地图的面积单位。
* @usage
* ```
* // 浏览器
* <script type="text/javascript" src="{cdn}"></script>
* <script>
* const result = {namespace}.getSquareMeterPerMapUnit(mapUnit);
*
* </script>
*
* // ES6 Import
* import { getMeterPerMapUnit } from '{npm}';
*
* const result = getMeterPerMapUnit(mapUnit);
* ```
*/
const AREA_MAP = {
SquareFoot: 10.763910417,
SquareKiloMeter: 0.000001,
SquareMeter: 1,
SquareMile: 3.86e-7,
SquareYard: 1.195990046
}
export var getSquareMeterPerMapUnit = function(mapUnit) {
return AREA_MAP[mapUnit];
};
/**
* @private
* @function getWrapNum
* @description 获取该坐标系的经纬度范围的经度或纬度。
* @category BaseTypes Util
* @param {number} x 经度或纬度。
* @param {boolean} includeMax 是否获取经度或纬度的最大值。
* @param {boolean} includeMin 是否获取经度或纬度的最小值。
* @param {number} range 坐标系的经纬度范围。
* @returns {number} 返回经度或纬度的值。
* @usage
* ```
* // 浏览器
* <script type="text/javascript" src="{cdn}"></script>
* <script>
* const result = {namespace}.getWrapNum(x, includeMax, includeMin, range);
*
* </script>
*
* // ES6 Import
* import { getWrapNum } from '{npm}';
*
* const result = getWrapNum(x, includeMax, includeMin, range);
* ```
*/
export function getWrapNum(x, includeMax = true, includeMin = true, range = [-180, 180]) {
var max = range[1],
min = range[0],
d = max - min;
if (x === max && includeMax) {
return x;
}
if (x === min && includeMin) {
return x;
}
var tmp = (((x - min) % d) + d) % d;
if (tmp === 0 && includeMax) {
return max;
}
return ((((x - min) % d) + d) % d) + min;
}
/**
* @private
* @function conversionDegree
* @description 转换经纬度。
* @category BaseTypes Util
* @param {number} degrees 经度或纬度。
* @returns {string} 返回度分秒。
* @usage
* ```
* // 浏览器
* <script type="text/javascript" src="{cdn}"></script>
* <script>
* const result = {namespace}.conversionDegree(degrees);
*
* </script>
*
* // ES6 Import
* import { conversionDegree } from '{npm}';
*
* const result = conversionDegree(degrees);
* ```
*/
export function conversionDegree(degrees) {
const degree = parseInt(degrees);
let fraction = parseInt((degrees - degree) * 60);
let second = parseInt(((degrees - degree) * 60 - fraction) * 60);
fraction = parseInt(fraction / 10) === 0 ? `0${fraction}` : fraction;
second = parseInt(second / 10) === 0 ? `0${second}` : second;
return `${degree}°${fraction}'${second}`;
}
/**
* @private
* @function scalesToResolutions
* @description 通过比例尺数组计算分辨率数组，没有传入比例尺数组时通过地图范围与地图最大级别进行计算。
* @version 11.0.1
* @param {Array} scales - 比例尺数组。
* @param {Object} bounds - 地图范围。
* @param {number} dpi - 屏幕分辨率。
* @param {string} mapUnit - 地图单位。
* @param {number} [level=22] - 地图最大级别。
* @returns {number} 分辨率。
* @usage
* ```
* // 浏览器
* <script type="text/javascript" src="{cdn}"></script>
* <script>
* const result = {namespace}.scalesToResolutions(scales, bounds, dpi, mapUnit);
*
* </script>
*
* // ES6 Import
* import { scalesToResolutions } from '{npm}';
*
* const result = scalesToResolutions(scales, bounds, dpi, mapUnit);
* ```
*/
export function scalesToResolutions(scales, bounds, dpi, mapUnit, level = 22, baseScale) {
var resolutions = [];
if (scales && scales.length > 0) {
for (let i = 0; i < scales.length; i++) {
resolutions.push(scaleToResolution(scales[i], dpi, mapUnit));
}
} else if (baseScale){
const maxReolution = Math.abs(bounds.left - bounds.right) / 256;
const baseRes = scaleToResolution(baseScale, dpi, mapUnit);
let topRes = baseRes;
for (let i = 0; i < level; i++) {
const temp = baseRes * Math.pow(2, i);
if(Math.abs(temp,maxReolution)<= 1E-6 || temp>maxReolution){
topRes = temp;
break;
}
}
for (let i = 0; i < level; i++) {
resolutions.push(topRes / Math.pow(2, i));
}
} else {
const maxReolution = Math.abs(bounds.left - bounds.right) / 256;
for (let i = 0; i < level; i++) {
resolutions.push(maxReolution / Math.pow(2, i));
}
}
return resolutions.sort(function (a, b) {
return b - a;
});
}
/**
* @private
* @function getZoomByResolution
* @description 通过分辨率获取地图级别。
* @version 11.0.1
* @param {number} resolution - 分辨率。
* @param {Array} resolutions - 分辨率数组。
* @returns {number} 地图级别。
* @usage
* ```
* // 浏览器
* <script type="text/javascript" src="{cdn}"></script>
* <script>
* const result = {namespace}.getZoomByResolution(resolution, resolutions);
*
* </script>
*
* // ES6 Import
* import { getZoomByResolution } from '{npm}';
*
* const result = getZoomByResolution(resolution, resolutions);
* ```
*/
export function getZoomByResolution(resolution, resolutions) {
let zoom = 0;
let minDistance;
for (let i = 0; i < resolutions.length; i++) {
if (i === 0) {
minDistance = Math.abs(resolution - resolutions[i]);
}
if (minDistance > Math.abs(resolution - resolutions[i])) {
minDistance = Math.abs(resolution - resolutions[i]);
zoom = i;
}
}
return zoom;
}
/**
* @private
* @function scaleToResolution
* @description 通过比例尺计算分辨率。
* @version 11.0.1
* @param {number} scale - 比例尺。
* @param {number} dpi - 屏幕分辨率。
* @param {string} mapUnit - 地图单位。
* @returns {number} 分辨率。
* @usage
* ```
* // 浏览器
* <script type="text/javascript" src="{cdn}"></script>
* <script>
* const result = {namespace}.scaleToResolution(scale, dpi, mapUnit);
*
* </script>
*
* // ES6 Import
* import { scaleToResolution } from '{npm}';
*
* const result = scaleToResolution(scale, dpi, mapUnit);
* ```
*/
export function scaleToResolution(scale, dpi, mapUnit) {
const inchPerMeter = 1 / 0.0254;
const meterPerMapUnitValue = getMeterPerMapUnit(mapUnit);
const resolution = 1 / (scale * dpi * inchPerMeter * meterPerMapUnitValue);
return resolution;
}
export function getDpi(scale, resolution, mapUnit) {
const inchPerMeter = 1 / 0.0254;
const meterPerMapUnitValue = getMeterPerMapUnit(mapUnit);
const dpi = 1.0/resolution/(scale * inchPerMeter * meterPerMapUnitValue);
return dpi;
}
/**
* @private
* 范围是否相交。
* @param {Array} extent1 范围 1。
* @param {Array} extent2 范围 2。
* @return {boolean} 范围是否相交。
*/
export function intersects(extent1, extent2) {
return (
extent1[0] <= extent2[2] &&
extent1[2] >= extent2[0] &&
extent1[1] <= extent2[3] &&
extent1[3] >= extent2[1]
);
}
/**
* @private
* 获取两个范围的交集。
* @param {Array} extent1 范围 1。
* @param {Array} extent2 范围 2。
* @return {Array} 相交范围数组。
* @api
*/
export function getIntersection(extent1, extent2) {
const intersection = [];
if (intersects(extent1, extent2)) {
if (extent1[0] > extent2[0]) {
intersection[0] = extent1[0];
} else {
intersection[0] = extent2[0];
}
if (extent1[1] > extent2[1]) {
intersection[1] = extent1[1];
} else {
intersection[1] = extent2[1];
}
if (extent1[2] < extent2[2]) {
intersection[2] = extent1[2];
} else {
intersection[2] = extent2[2];
}
if (extent1[3] < extent2[3]) {
intersection[3] = extent1[3];
} else {
intersection[3] = extent2[3];
}
}
return intersection;
}