Frederic Junod
22 lines
720 B
JavaScript
22 lines
720 B
JavaScript
/**
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* @module ol/geom/flat/topology
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*/
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import {linearRing as linearRingArea} from './area.js';
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/**
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* Check if the linestring is a boundary.
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* @param {Array<number>} flatCoordinates Flat coordinates.
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* @param {number} offset Offset.
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* @param {number} end End.
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* @param {number} stride Stride.
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* @return {boolean} The linestring is a boundary.
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*/
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export function lineStringIsClosed(flatCoordinates, offset, end, stride) {
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const lastCoord = end - stride;
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if (flatCoordinates[offset] === flatCoordinates[lastCoord] &&
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flatCoordinates[offset + 1] === flatCoordinates[lastCoord + 1] && (end - offset) / stride > 3) {
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return !!linearRingArea(flatCoordinates, offset, end, stride);
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}
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return false;
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}
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