dataStackHelper.js
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import {each, isString} from 'zrender/src/core/util';
/**
* Note that it is too complicated to support 3d stack by value
* (have to create two-dimension inverted index), so in 3d case
* we just support that stacked by index.
*
* @param {module:echarts/model/Series} seriesModel
* @param {Array.<string|Object>} dimensionInfoList The same as the input of <module:echarts/data/List>.
* The input dimensionInfoList will be modified.
* @param {Object} [opt]
* @param {boolean} [opt.stackedCoordDimension=''] Specify a coord dimension if needed.
* @param {boolean} [opt.byIndex=false]
* @return {Object} calculationInfo
* {
* stackedDimension: string
* stackedByDimension: string
* isStackedByIndex: boolean
* stackedOverDimension: string
* stackResultDimension: string
* }
*/
export function enableDataStack(seriesModel, dimensionInfoList, opt) {
opt = opt || {};
var byIndex = opt.byIndex;
var stackedCoordDimension = opt.stackedCoordDimension;
// Compatibal: when `stack` is set as '', do not stack.
var mayStack = !!(seriesModel && seriesModel.get('stack'));
var stackedByDimInfo;
var stackedDimInfo;
var stackResultDimension;
var stackedOverDimension;
each(dimensionInfoList, function (dimensionInfo, index) {
if (isString(dimensionInfo)) {
dimensionInfoList[index] = dimensionInfo = {name: dimensionInfo};
}
if (mayStack && !dimensionInfo.isExtraCoord) {
// Find the first ordinal dimension as the stackedByDimInfo.
if (!byIndex && !stackedByDimInfo && dimensionInfo.ordinalMeta) {
stackedByDimInfo = dimensionInfo;
}
// Find the first stackable dimension as the stackedDimInfo.
if (!stackedDimInfo
&& dimensionInfo.type !== 'ordinal'
&& dimensionInfo.type !== 'time'
&& (!stackedCoordDimension || stackedCoordDimension === dimensionInfo.coordDim)
) {
stackedDimInfo = dimensionInfo;
}
}
});
if (stackedDimInfo && !byIndex && !stackedByDimInfo) {
// Compatible with previous design, value axis (time axis) only stack by index.
// It may make sense if the user provides elaborately constructed data.
byIndex = true;
}
// Add stack dimension, they can be both calculated by coordinate system in `unionExtent`.
// That put stack logic in List is for using conveniently in echarts extensions, but it
// might not be a good way.
if (stackedDimInfo) {
// Use a weird name that not duplicated with other names.
stackResultDimension = '__\0ecstackresult';
stackedOverDimension = '__\0ecstackedover';
// Create inverted index to fast query index by value.
if (stackedByDimInfo) {
stackedByDimInfo.createInvertedIndices = true;
}
var stackedDimCoordDim = stackedDimInfo.coordDim;
var stackedDimType = stackedDimInfo.type;
var stackedDimCoordIndex = 0;
each(dimensionInfoList, function (dimensionInfo) {
if (dimensionInfo.coordDim === stackedDimCoordDim) {
stackedDimCoordIndex++;
}
});
dimensionInfoList.push({
name: stackResultDimension,
coordDim: stackedDimCoordDim,
coordDimIndex: stackedDimCoordIndex,
type: stackedDimType,
isExtraCoord: true,
isCalculationCoord: true
});
stackedDimCoordIndex++;
dimensionInfoList.push({
name: stackedOverDimension,
// This dimension contains stack base (generally, 0), so do not set it as
// `stackedDimCoordDim` to avoid extent calculation, consider log scale.
coordDim: stackedOverDimension,
coordDimIndex: stackedDimCoordIndex,
type: stackedDimType,
isExtraCoord: true,
isCalculationCoord: true
});
}
return {
stackedDimension: stackedDimInfo && stackedDimInfo.name,
stackedByDimension: stackedByDimInfo && stackedByDimInfo.name,
isStackedByIndex: byIndex,
stackedOverDimension: stackedOverDimension,
stackResultDimension: stackResultDimension
};
}
/**
* @param {module:echarts/data/List} data
* @param {string} stackedDim
*/
export function isDimensionStacked(data, stackedDim /*, stackedByDim*/) {
// Each single series only maps to one pair of axis. So we do not need to
// check stackByDim, whatever stacked by a dimension or stacked by index.
return !!stackedDim && stackedDim === data.getCalculationInfo('stackedDimension');
// && (
// stackedByDim != null
// ? stackedByDim === data.getCalculationInfo('stackedByDimension')
// : data.getCalculationInfo('isStackedByIndex')
// );
}
/**
* @param {module:echarts/data/List} data
* @param {string} targetDim
* @param {string} [stackedByDim] If not input this parameter, check whether
* stacked by index.
* @return {string} dimension
*/
export function getStackedDimension(data, targetDim) {
return isDimensionStacked(data, targetDim)
? data.getCalculationInfo('stackResultDimension')
: targetDim;
}