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

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

import { Box, IBoundingBox, IRect } from '../classes/index';
import { FaceDetection } from '../classes/FaceDetection';
import { isWithFaceDetection, WithFaceDetection } from '../factories/WithFaceDetection';
import { round } from '../utils/index';
import { DrawBox } from './DrawBox';

export type TDrawDetectionsInput = IRect | IBoundingBox | FaceDetection | WithFaceDetection<{}>

export function drawDetections(
  canvasArg: string | HTMLCanvasElement,
  detections: TDrawDetectionsInput | Array<TDrawDetectionsInput>,
) {
  const detectionsArray = Array.isArray(detections) ? detections : [detections];

  detectionsArray.forEach((det) => {
    // eslint-disable-next-line no-nested-ternary
    const score = det instanceof FaceDetection
      ? det.score
      : (isWithFaceDetection(det) ? det.detection.score : undefined);

    // eslint-disable-next-line no-nested-ternary
    const box = det instanceof FaceDetection
      ? det.box
      : (isWithFaceDetection(det) ? det.detection.box : new Box(det));

    const label = score ? `${round(score)}` : undefined;
    new DrawBox(box, { label }).draw(canvasArg);
  });
}