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

FaceAPI: AI-powered Face Detection & Rotation Tracking, Face Description & Recognition, Age & Gender & Emotion Prediction for Browser and NodeJS using TensorFlow/JS

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

export function drawContour(
  ctx: CanvasRenderingContext2D,
  points: Point[],
  isClosed = 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();
}