// import dayjs from 'dayjs' //替换dayjs 兼容性会好一点，但是速度就很慢了，之前测了一下，大概快30倍？有点忘记了
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//缓存 解析值，加速一点点吧
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const cacheParseTime = function () {
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let cacheString = {}
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let cacheValue = {}
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return function(timeName, timeString) {
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if (cacheString[timeName] !== timeString) {
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cacheString[timeName] = timeString;
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cacheValue[timeName] = parseTime(timeString)
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}
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return cacheValue[timeName]
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}
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}()
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// pStart 关于缓存这个值是因为getWidthAbout2Times和getPositonOffset通常是前后连续调用，start 值会再两个函数中分别用到一次
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/**
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* 根据配置项计算两个时间的在gantt 图中的长度
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* 注：时间上start 早， end 晚
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*
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* @export
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* @param {string} start
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* @param {string} end
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* @param {{scale:number,cellWidth:number}} arg
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* @returns number
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*/
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export function getWidthAbout2Times(start, end, arg) {
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let {
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scale,
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cellWidth
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} = arg;
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let pStart = cacheParseTime('pStart', start);
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let pEnd = parseTime(end)
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return diffTimeByMinutes(pStart, pEnd) / scale * cellWidth;
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}
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/**
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* 根据配置项计算 相对于 时间轴起始时间的距离 是 getWidthAbout2Times 的特化
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* 注：时间上，time 晚 beginTimeOfTimeLine 早
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*
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* @export
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* @param {string} time
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* @param {string} beginTimeOfTimeLine
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* @param {{scale:number,cellWidth:number}} arg
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* @returns number
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*/
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export function getPositonOffset(time, beginTimeOfTimeLine, arg) {
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let {
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scale,
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cellWidth,
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} = arg;
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let pTime = cacheParseTime('pStart', time);
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let pBeginTimeOfTimeLine = cacheParseTime('pBeginTimeOfTimeLine', beginTimeOfTimeLine);
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return diffTimeByMinutes(pBeginTimeOfTimeLine, pTime) / scale * cellWidth;
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}
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function parseTime(time) {
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return new Date(time)
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}
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/**
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* 计算两个时间相差的分钟数
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*
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* @param {string} start
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* @param {string} end
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* @returns
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*/
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function diffTimeByMinutes(start, end) {
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let diff = end.getTime() - start.getTime()
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return (diff / 1000 / 60)
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}
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// function parseTime(time){
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// return dayjs(time)
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// }
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// function diffTimeByMinutes(start,end){
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// return end.diff(start, "m", true)
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// }
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