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

Image processing and manipulation in JavaScript

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

/**
 * @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);
}