zh/builder/src/echarts3/component/visualMap/typeDefaulter.js

import Component from '../../model/Component';
Component.registerSubTypeDefaulter('visualMap', function (option) {
  // Compatible with ec2, when splitNumber === 0, continuous visualMap will be used.
  return !option.categories && (!(option.pieces ? option.pieces.length > 0 : option.splitNumber > 0) || option.calculable) ? 'continuous' : 'piecewise';
});