image-js/src/image/roi/creator/fromPoints.js

Image processing and manipulation in JavaScript

import Shape from '../../../util/Shape';
import RoiMap from '../RoiMap';

/**
 * @memberof RoiManager
 * @instance
 * @param {Array<Array<number>>} pointsToPaint - an array of points
 * @param {object} [options]
 * @return {RoiMap}
 */
export default function fromPoints(pointsToPaint, options = {}) {
  let shape = new Shape(options);

  // based on a binary image we will create plenty of small images
  let data = new Int16Array(this.size); // maxValue: 32767, minValue: -32768
  let positiveID = 0;
  let shapePoints = shape.getPoints();
  for (let i = 0; i < pointsToPaint.length; i++) {
    positiveID++;
    let xP = pointsToPaint[i][0];
    let yP = pointsToPaint[i][1];
    for (let j = 0; j < shapePoints.length; j++) {
      let xS = shapePoints[j][0];
      let yS = shapePoints[j][1];
      if (
        xP + xS >= 0 &&
        yP + yS >= 0 &&
        xP + xS < this.width &&
        yP + yS < this.height
      ) {
        data[xP + xS + (yP + yS) * this.width] = positiveID;
      }
    }
  }

  return new RoiMap(this, data);
}