ol/geom/flat/topology.js

OpenLayers mapping library

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