bc518174
 王天杨
提交两个项目文件
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import isString from 'lodash/isString';
import isNan from 'lodash/isNaN';
import get from 'lodash/get';
import lodashIsNumber from 'lodash/isNumber';
export var mathSign = function mathSign(value) {
if (value === 0) {
return 0;
}
if (value > 0) {
return 1;
}
return -1;
};
export var isPercent = function isPercent(value) {
return isString(value) && value.indexOf('%') === value.length - 1;
};
export var isNumber = function isNumber(value) {
return lodashIsNumber(value) && !isNan(value);
};
export var isNumOrStr = function isNumOrStr(value) {
return isNumber(value) || isString(value);
};
var idCounter = 0;
export var uniqueId = function uniqueId(prefix) {
var id = ++idCounter;
return "".concat(prefix || '').concat(id);
};
/**
* Get percent value of a total value
* @param {number|string} percent A percent
* @param {number} totalValue Total value
* @param {number} defaultValue The value returned when percent is undefined or invalid
* @param {boolean} validate If set to be true, the result will be validated
* @return {number} value
*/
export var getPercentValue = function getPercentValue(percent, totalValue) {
var defaultValue = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;
var validate = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
if (!isNumber(percent) && !isString(percent)) {
return defaultValue;
}
var value;
if (isPercent(percent)) {
var index = percent.indexOf('%');
value = totalValue * parseFloat(percent.slice(0, index)) / 100;
} else {
value = +percent;
}
if (isNan(value)) {
value = defaultValue;
}
if (validate && value > totalValue) {
value = totalValue;
}
return value;
};
export var getAnyElementOfObject = function getAnyElementOfObject(obj) {
if (!obj) {
return null;
}
var keys = Object.keys(obj);
if (keys && keys.length) {
return obj[keys[0]];
}
return null;
};
export var hasDuplicate = function hasDuplicate(ary) {
if (!Array.isArray(ary)) {
return false;
}
var len = ary.length;
var cache = {};
for (var i = 0; i < len; i++) {
if (!cache[ary[i]]) {
cache[ary[i]] = true;
} else {
return true;
}
}
return false;
};
/* @todo consider to rename this function into `getInterpolator` */
export var interpolateNumber = function interpolateNumber(numberA, numberB) {
if (isNumber(numberA) && isNumber(numberB)) {
return function (t) {
return numberA + t * (numberB - numberA);
};
}
return function () {
return numberB;
};
};
export function findEntryInArray(ary, specifiedKey, specifiedValue) {
if (!ary || !ary.length) {
return null;
}
return ary.find(function (entry) {
return entry && (typeof specifiedKey === 'function' ? specifiedKey(entry) : get(entry, specifiedKey)) === specifiedValue;
});
}
/**
* The least square linear regression
* @param {Array} data The array of points
* @returns {Object} The domain of x, and the parameter of linear function
*/
export var getLinearRegression = function getLinearRegression(data) {
if (!data || !data.length) {
return null;
}
var len = data.length;
var xsum = 0;
var ysum = 0;
var xysum = 0;
var xxsum = 0;
var xmin = Infinity;
var xmax = -Infinity;
var xcurrent = 0;
var ycurrent = 0;
for (var i = 0; i < len; i++) {
xcurrent = data[i].cx || 0;
ycurrent = data[i].cy || 0;
xsum += xcurrent;
ysum += ycurrent;
xysum += xcurrent * ycurrent;
xxsum += xcurrent * xcurrent;
xmin = Math.min(xmin, xcurrent);
xmax = Math.max(xmax, xcurrent);
}
var a = len * xxsum !== xsum * xsum ? (len * xysum - xsum * ysum) / (len * xxsum - xsum * xsum) : 0;
return {
xmin: xmin,
xmax: xmax,
a: a,
b: (ysum - a * xsum) / len
};
};
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