dataStack.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 {createHashMap, each} from 'zrender/src/core/util';
// (1) [Caution]: the logic is correct based on the premises:
// data processing stage is blocked in stream.
// See <module:echarts/stream/Scheduler#performDataProcessorTasks>
// (2) Only register once when import repeatly.
// Should be executed before after series filtered and before stack calculation.
export default function (ecModel) {
var stackInfoMap = createHashMap();
ecModel.eachSeries(function (seriesModel) {
var stack = seriesModel.get('stack');
// Compatibal: when `stack` is set as '', do not stack.
if (stack) {
var stackInfoList = stackInfoMap.get(stack) || stackInfoMap.set(stack, []);
var data = seriesModel.getData();
var stackInfo = {
// Used for calculate axis extent automatically.
stackResultDimension: data.getCalculationInfo('stackResultDimension'),
stackedOverDimension: data.getCalculationInfo('stackedOverDimension'),
stackedDimension: data.getCalculationInfo('stackedDimension'),
stackedByDimension: data.getCalculationInfo('stackedByDimension'),
isStackedByIndex: data.getCalculationInfo('isStackedByIndex'),
data: data,
seriesModel: seriesModel
};
// If stacked on axis that do not support data stack.
if (!stackInfo.stackedDimension
|| !(stackInfo.isStackedByIndex || stackInfo.stackedByDimension)
) {
return;
}
stackInfoList.length && data.setCalculationInfo(
'stackedOnSeries', stackInfoList[stackInfoList.length - 1].seriesModel
);
stackInfoList.push(stackInfo);
}
});
stackInfoMap.each(calculateStack);
}
function calculateStack(stackInfoList) {
each(stackInfoList, function (targetStackInfo, idxInStack) {
var resultVal = [];
var resultNaN = [NaN, NaN];
var dims = [targetStackInfo.stackResultDimension, targetStackInfo.stackedOverDimension];
var targetData = targetStackInfo.data;
var isStackedByIndex = targetStackInfo.isStackedByIndex;
// Should not write on raw data, because stack series model list changes
// depending on legend selection.
var newData = targetData.map(dims, function (v0, v1, dataIndex) {
var sum = targetData.get(targetStackInfo.stackedDimension, dataIndex);
// Consider `connectNulls` of line area, if value is NaN, stackedOver
// should also be NaN, to draw a appropriate belt area.
if (isNaN(sum)) {
return resultNaN;
}
var byValue;
var stackedDataRawIndex;
if (isStackedByIndex) {
stackedDataRawIndex = targetData.getRawIndex(dataIndex);
}
else {
byValue = targetData.get(targetStackInfo.stackedByDimension, dataIndex);
}
// If stackOver is NaN, chart view will render point on value start.
var stackedOver = NaN;
for (var j = idxInStack - 1; j >= 0; j--) {
var stackInfo = stackInfoList[j];
// Has been optimized by inverted indices on `stackedByDimension`.
if (!isStackedByIndex) {
stackedDataRawIndex = stackInfo.data.rawIndexOf(stackInfo.stackedByDimension, byValue);
}
if (stackedDataRawIndex >= 0) {
var val = stackInfo.data.getByRawIndex(stackInfo.stackResultDimension, stackedDataRawIndex);
// Considering positive stack, negative stack and empty data
if ((sum >= 0 && val > 0) // Positive stack
|| (sum <= 0 && val < 0) // Negative stack
) {
sum += val;
stackedOver = val;
break;
}
}
}
resultVal[0] = sum;
resultVal[1] = stackedOver;
return resultVal;
});
targetData.hostModel.setData(newData);
// Update for consequent calculation
targetStackInfo.data = newData;
});
}