[GitHub] [incubator-echarts] zhiweinibajian opened a new issue #11441: 关于echarts2.0后雷达图单轴显示解决方案

[GitBox <gi...@apache.org>]

zhiweinibajian opened a new issue #11441: 关于echarts2.0后雷达图单轴显示解决方案
URL: https://github.com/apache/incubator-echarts/issues/11441
 
 
   **要想解决此问题，必须拿到x坐标和y坐标，然后计算得到对应的index
   x坐标和y坐标可以通过源码中的_showTooltipContent方法进行返回；
   或者通过echart.on('mousemove',function(params){})可以得到，
   拿到x坐标和y坐标后调用下面方法就可以得到你想要的index了
   **
   
   
   `//zr:echarts实例;x:鼠标x坐标;y:鼠标y坐标;_index:seriesIndex
   function getRadarIndex(zr, x, y, _index) { 
               var polar = zr.getOption().radar;
   
               var func = {
                   getNearestIndex: function (e) {
                       for (var t, n, i, a, o, r, s, l, h, V = 0; V < polar.length; V++) {
                           if (t = polar[V], n = this.getCenter(V), e[0] == n[0] && e[1] == n[1]) return 0;
                           if (i = this._getRadius(), o = t.startAngle, r = t.indicator, s = r.length, l = 2 * Math.PI / s, a = this.cartesian2polar(e[0] - n[0], n[1] - e[1]), e[0] - n[0] < 0 && (a[1] += Math.PI), a[1] < 0 && (a[1] += 2 * Math.PI), h = a[1] - o / 180 * Math.PI + 2 * Math.PI, Math.abs(Math.cos(h % (l / 2))) * i > a[0]) return Math.floor((h + l / 2) / l) % s;
                       }
                       return Math.floor((h + l / 2) / l) % s;
                   },
                   getCenter: function (e) {
                       var e = e || 0;
                       return this.parseCenter(zr, polar[e].center);
                   },
                   _getRadius: function () {
                       var e = polar[_index];
                       return this.parsePercent(e.radius, Math.min(zr.getWidth(), zr.getHeight()) / 2);
                   },
                   cartesian2polar: function (e, t) {
                       return [Math.sqrt(e * e + t * t), Math.atan(t / e)];
                   },
                   parseCenter: function (e, n) {
                       return [this.parsePercent(n[0], e.getWidth()), this.parsePercent(n[1], e.getHeight())];
                   },
   
                   parsePercent: function (t, n) {
                       return "string" == typeof t ? this.trimSpace(t).match(/%$/) ? parseFloat(t) / 100 * n : parseFloat(t) : t;
                   },
                   trimSpace: function (e) {
                       return e.replace(/^\s+/, "").replace(/\s+$/, "");
                   }
               }
   
               return func.getNearestIndex([x, y]);
           }`
   

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