polyline isClosed.ts

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  import { glMatrix } from 'gl-matrix';
import type { Types } from '@cornerstonejs/core';
import { distanceToPointSquared } from '../point';
 
/**
 * A polyline is considered closed if the start and end points are at the same position
 *
 * @param polyline - Polyline points (2D)
 * @returns True if the polyline is already closed or false otherwise
 */
export default function isClosed(polyline: Types.Point2[]): boolean {
  if (polyline.length < 3) {
    return false;
  }
 
  const numPolylinePoints = polyline.length;
 
  const firstPoint = polyline[0];
  const lastPoint = polyline[numPolylinePoints - 1];
  const distFirstToLastPoints = distanceToPointSquared(firstPoint, lastPoint);
 
  return glMatrix.equals(0, distFirstToLastPoints);
}