echarts radarLayout 源码
echarts radarLayout 代码
文件路径：/src/chart/radar/radarLayout.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 * as zrUtil from 'zrender/src/core/util';
import GlobalModel from '../../model/Global';
import RadarSeriesModel from './RadarSeries';
import Radar from '../../coord/radar/Radar';
type Point = number[];
export default function radarLayout(ecModel: GlobalModel) {
ecModel.eachSeriesByType('radar', function (seriesModel: RadarSeriesModel) {
const data = seriesModel.getData();
const points: Point[][] = [];
const coordSys = seriesModel.coordinateSystem;
if (!coordSys) {
return;
}
const axes = coordSys.getIndicatorAxes();
zrUtil.each(axes, function (axis, axisIndex) {
data.each(data.mapDimension(axes[axisIndex].dim), function (val, dataIndex) {
points[dataIndex] = points[dataIndex] || [];
const point = coordSys.dataToPoint(val, axisIndex);
points[dataIndex][axisIndex] = isValidPoint(point)
? point : getValueMissingPoint(coordSys);
});
});
// Close polygon
data.each(function (idx) {
// TODO
// Is it appropriate to connect to the next data when some data is missing?
// Or, should trade it like `connectNull` in line chart?
const firstPoint = zrUtil.find(points[idx], function (point) {
return isValidPoint(point);
}) || getValueMissingPoint(coordSys);
// Copy the first actual point to the end of the array
points[idx].push(firstPoint.slice());
data.setItemLayout(idx, points[idx]);
});
});
}
function isValidPoint(point: Point) {
return !isNaN(point[0]) && !isNaN(point[1]);
}
function getValueMissingPoint(coordSys: Radar): Point {
// It is error-prone to input [NaN, NaN] into polygon, polygon.
// (probably cause problem when refreshing or animating)
return [coordSys.cx, coordSys.cy];
}
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