Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | 1x 58x 47x 47x 47x 47x 11x 11x | import { type Polygon } from './@types/geometry.ts';
/**
* Determines whether a given polygon is closed.
*
* A polygon is considered closed if it has more than one point and
* its first and last points have identical `x` and `y` coordinates.
* @param polygon - An array of points representing the polygon, where each point has `x` and `y` properties.
* @returns `true` if the polygon is closed; otherwise, `false`.
* @group Geometry
* @category Polygon
*/
export function isClosed(polygon: Polygon): boolean {
if (polygon.length > 1) {
const first = polygon.at(0)!;
const last = polygon.at(-1)!;
return first.x === last.x && first.y === last.y;
}
return true;
}
|