voluptasquisquam/src/image/compute/points.js

Image processing and manipulation in JavaScript

/**
 * Allows to generate an array of points for a binary image (bit depth = 1)
 * @memberof Image
 * @instance
 * @return {Array<Array<number>>} - an array of [x,y] corresponding to the set pixels in the binary image
 */
export default function points() {
    this.checkProcessable('points', {
        bitDepth: [1]
    });

    let pixels = new Array(this.size);
    let counter = 0;
    for (let x = 0; x < this.width; x++) {
        for (let y = 0; y < this.height; y++) {
            if (this.getBitXY(x, y) === 1) {
                pixels[counter++] = [x, y];
            }
        }
    }
    pixels.length = counter;
    return pixels;
}