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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | 1x 1x 1x 8x 8x 25x 25x 25x 8x 8x | import { type Polygon } from './@types/geometry.ts';
import { lineLength } from './line-length.ts';
import { modulo } from './modulo.ts';
/**
* Calculates the perimeter of a polygon.
* @param polygon - The polygon.
* @returns The total perimeter length of the polygon.
* @example
* ```typescript
* const polygon: Polygon = [
* { x: 0, y: 0 },
* { x: 10, y: 0 },
* { x: 10, y: 10 },
* { x: 0, y: 10 }
* ];
* const result = perimeter(polygon);
* // result: 40
* ```
* @group Geometry
* @category Polygon
*/
export function perimeter(polygon: Polygon): number {
let total = 0;
for (const [index, vertex0] of polygon.entries()) {
const vertex1 = polygon[modulo(index + 1, polygon.length)];
total += lineLength({ x0: vertex0.x, y0: vertex0.y, x1: vertex1.x, y1: vertex1.y });
}
return total;
}
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