en/builder/src/echarts3/chart/candlestick/candlestickVisual.js

var positiveBorderColorQuery = ['itemStyle', 'normal', 'borderColor'];
var negativeBorderColorQuery = ['itemStyle', 'normal', 'borderColor0'];
var positiveColorQuery = ['itemStyle', 'normal', 'color'];
var negativeColorQuery = ['itemStyle', 'normal', 'color0'];
export default function (ecModel, api) {
  ecModel.eachRawSeriesByType('candlestick', function (seriesModel) {
    var data = seriesModel.getData();
    data.setVisual({
      legendSymbol: 'roundRect'
    }); // Only visible series has each data be visual encoded

    if (!ecModel.isSeriesFiltered(seriesModel)) {
      data.each(function (idx) {
        var itemModel = data.getItemModel(idx);
        var sign = data.getItemLayout(idx).sign;
        data.setItemVisual(idx, {
          color: itemModel.get(sign > 0 ? positiveColorQuery : negativeColorQuery),
          borderColor: itemModel.get(sign > 0 ? positiveBorderColorQuery : negativeBorderColorQuery)
        });
      });
    }
  });
}