en/builder/src/echarts3/component/visualMap/visualEncoding.js

import * as echarts from '../../echarts';
import * as zrUtil from 'zrender/src/core/util';
import * as visualSolution from '../../visual/visualSolution';
import VisualMapping from '../../visual/VisualMapping';
echarts.registerVisual(echarts.PRIORITY.VISUAL.COMPONENT, function (ecModel) {
  ecModel.eachComponent('visualMap', function (visualMapModel) {
    processSingleVisualMap(visualMapModel, ecModel);
  });
  prepareVisualMeta(ecModel);
});

function processSingleVisualMap(visualMapModel, ecModel) {
  visualMapModel.eachTargetSeries(function (seriesModel) {
    var data = seriesModel.getData();
    visualSolution.applyVisual(visualMapModel.stateList, visualMapModel.targetVisuals, data, visualMapModel.getValueState, visualMapModel, visualMapModel.getDataDimension(data));
  });
} // Only support color.


function prepareVisualMeta(ecModel) {
  ecModel.eachSeries(function (seriesModel) {
    var data = seriesModel.getData();
    var visualMetaList = [];
    ecModel.eachComponent('visualMap', function (visualMapModel) {
      if (visualMapModel.isTargetSeries(seriesModel)) {
        var visualMeta = visualMapModel.getVisualMeta(zrUtil.bind(getColorVisual, null, seriesModel, visualMapModel)) || {
          stops: [],
          outerColors: []
        };
        visualMeta.dimension = visualMapModel.getDataDimension(data);
        visualMetaList.push(visualMeta);
      }
    }); // console.log(JSON.stringify(visualMetaList.map(a => a.stops)));

    seriesModel.getData().setVisual('visualMeta', visualMetaList);
  });
} // FIXME
// performance and export for heatmap?
// value can be Infinity or -Infinity


function getColorVisual(seriesModel, visualMapModel, value, valueState) {
  var mappings = visualMapModel.targetVisuals[valueState];
  var visualTypes = VisualMapping.prepareVisualTypes(mappings);
  var resultVisual = {
    color: seriesModel.getData().getVisual('color') // default color.

  };

  for (var i = 0, len = visualTypes.length; i < len; i++) {
    var type = visualTypes[i];
    var mapping = mappings[type === 'opacity' ? '__alphaForOpacity' : type];
    mapping && mapping.applyVisual(value, getVisual, setVisual);
  }

  return resultVisual.color;

  function getVisual(key) {
    return resultVisual[key];
  }

  function setVisual(key, value) {
    resultVisual[key] = value;
  }
}