Function circularLayout

_benchmarks/sample_echarts.js:56822–56862

* `basedOn` can be: * 'value': * This layout is not accurate and have same bad case. For example, * if the min value is very smaller than the max value, the nodes * with the min value probably overlap even though there is enough * space to layout them. So we

(seriesModel, basedOn)

     */

    function circularLayout(seriesModel, basedOn) {
      var coordSys = seriesModel.coordinateSystem;

      if (coordSys && coordSys.type !== 'view') {
        return;
      }

      var rect = coordSys.getBoundingRect();
      var nodeData = seriesModel.getData();
      var graph = nodeData.graph;
      var cx = rect.width / 2 + rect.x;
      var cy = rect.height / 2 + rect.y;
      var r = Math.min(rect.width, rect.height) / 2;
      var count = nodeData.count();
      nodeData.setLayout({
        cx: cx,
        cy: cy
      });

      if (!count) {
        return;
      }

      _layoutNodesBasedOn[basedOn](seriesModel, graph, nodeData, r, cx, cy, count);

      graph.eachEdge(function (edge, index) {
        var curveness = retrieve3(edge.getModel().get(['lineStyle', 'curveness']), getCurvenessForEdge(edge, seriesModel, index), 0);
        var p1 = clone$1(edge.node1.getLayout());
        var p2 = clone$1(edge.node2.getLayout());
        var cp1;
        var x12 = (p1[0] + p2[0]) / 2;
        var y12 = (p1[1] + p2[1]) / 2;

        if (+curveness) {
          curveness *= 3;
          cp1 = [cx * curveness + x12 * (1 - curveness), cy * curveness + y12 * (1 - curveness)];
        }

        edge.setLayout([p1, p2, cp1]);
      });
    }
    var _layoutNodesBasedOn = {
      value: function (seriesModel, graph, nodeData, r, cx, cy, count) {
        var angle = 0;