100pah commented on a change in pull request #8997: Pie chart adds filterValue
parameter
URL: https://github.com/apache/incubator-echarts/pull/8997#discussion_r229185836
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File path: src/chart/pie/PieView.js
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@@ -319,7 +327,8 @@ var PieView = ChartView.extend({
);
var selectedMode = seriesModel.get('selectedMode');
-
+ var valueDim = data.mapDimension('value');
+ data._sum = data.getSum(valueDim) || 0;
Review comment:
By convention, a property name prefixed by a single `'_'` represents the
property is a "private member" of an class. We should not add other that kind
of properties (`_xxx`) outside the class definition dynamically. Otherwise,
that probably confuse the code reader and might overwrite the inner private
members with the same name.
If we need save the `sum` here, it's OK to to save it to `this`, because in
this module we have the legal control of `this`.
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