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57 lines
1.7 KiB
TypeScript
57 lines
1.7 KiB
TypeScript
/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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import { extent as d3Extent } from 'd3-array';
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import { Point, Range } from '../types';
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const LAT_LIMIT: Range = [-90, 90];
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const LNG_LIMIT: Range = [-180, 180];
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/**
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* Expand a coordinate range by `padding` and within limits, if needed
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*/
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function expandIfNeeded(
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[curMin, curMax]: Range,
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[minBound, maxBound]: Range,
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padding = 0.25,
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) {
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return curMin < curMax
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? [curMin, curMax]
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: [
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Math.max(minBound, curMin - padding),
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Math.min(maxBound, curMax + padding),
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];
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}
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export default function computeBoundsFromPoints(
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points: Point[],
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): [Point, Point] {
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const latBounds = expandIfNeeded(
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d3Extent(points, (x: Point) => x[1]) as Range,
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LAT_LIMIT,
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);
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const lngBounds = expandIfNeeded(
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d3Extent(points, (x: Point) => x[0]) as Range,
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LNG_LIMIT,
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);
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return [
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[lngBounds[0], latBounds[0]],
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[lngBounds[1], latBounds[1]],
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];
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}
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