superset computeBoundsFromPoints 源码
superset computeBoundsFromPoints 代码
文件路径：/superset-frontend/plugins/legacy-preset-chart-deckgl/src/utils/computeBoundsFromPoints.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 { extent as d3Extent } from 'd3-array';
import { Point, Range } from '../types';
const LAT_LIMIT: Range = [-90, 90];
const LNG_LIMIT: Range = [-180, 180];
/**
* Expand a coordinate range by `padding` and within limits, if needed
*/
function expandIfNeeded(
[curMin, curMax]: Range,
[minBound, maxBound]: Range,
padding = 0.25,
) {
return curMin < curMax
? [curMin, curMax]
: [
Math.max(minBound, curMin - padding),
Math.min(maxBound, curMax + padding),
];
}
export default function computeBoundsFromPoints(
points: Point[],
): [Point, Point] {
const latBounds = expandIfNeeded(
d3Extent(points, (x: Point) => x[1]) as Range,
LAT_LIMIT,
);
const lngBounds = expandIfNeeded(
d3Extent(points, (x: Point) => x[0]) as Range,
LNG_LIMIT,
);
return [
[lngBounds[0], latBounds[0]],
[lngBounds[1], latBounds[1]],
];
}
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