@vladmandic/face-api/src/draw/drawContour.ts

JavaScript module for Face Detection and Face Recognition Using Tensorflow/JS

import { Point } from '../classes';

export function drawContour(
  ctx: CanvasRenderingContext2D,
  points: Point[],
  isClosed: boolean = false
) {
  ctx.beginPath()

  points.slice(1).forEach(({ x, y }, prevIdx) => {
    const from = points[prevIdx]
    ctx.moveTo(from.x, from.y)
    ctx.lineTo(x, y)
  })

  if (isClosed) {
    const from = points[points.length - 1]
    const to = points[0]
    if (!from || !to) {
      return
    }

    ctx.moveTo(from.x, from.y)
    ctx.lineTo(to.x, to.y)
  }

  ctx.stroke()
}