echarts labelHelper 源码
echarts labelHelper 代码
文件路径：/src/chart/helper/labelHelper.ts
/*
* 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 {retrieveRawValue} from '../../data/helper/dataProvider';
import SeriesData from '../../data/SeriesData';
import { InterpolatableValue } from '../../util/types';
import { isArray } from 'zrender/src/core/util';
/**
* @return label string. Not null/undefined
*/
export function getDefaultLabel(
data: SeriesData,
dataIndex: number
): string {
const labelDims = data.mapDimensionsAll('defaultedLabel');
const len = labelDims.length;
// Simple optimization (in lots of cases, label dims length is 1)
if (len === 1) {
const rawVal = retrieveRawValue(data, dataIndex, labelDims[0]);
return rawVal != null ? rawVal + '' : null;
}
else if (len) {
const vals = [];
for (let i = 0; i < labelDims.length; i++) {
vals.push(retrieveRawValue(data, dataIndex, labelDims[i]));
}
return vals.join(' ');
}
}
export function getDefaultInterpolatedLabel(
data: SeriesData,
interpolatedValue: InterpolatableValue
): string {
const labelDims = data.mapDimensionsAll('defaultedLabel');
if (!isArray(interpolatedValue)) {
return interpolatedValue + '';
}
const vals = [];
for (let i = 0; i < labelDims.length; i++) {
const dimIndex = data.getDimensionIndex(labelDims[i]);
if (dimIndex >= 0) {
vals.push(interpolatedValue[dimIndex]);
}
}
return vals.join(' ');
}
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