image-in-browser/lib/image/pixel-range-iterator.js

Package for encoding / decoding images, transforming images, applying filters, drawing primitives on images on the client side (no need for server Node.js)

export class PixelRangeIterator {
    constructor(pixel, x, y, width, height) {
        this._pixel = pixel;
        this._x1 = x;
        this._y1 = y;
        this._x2 = x + width - 1;
        this._y2 = y + height - 1;
        this._pixel.setPosition(x - 1, y);
    }
    next() {
        if (this._pixel.x + 1 > this._x2) {
            this._pixel.setPosition(this._x1, this._pixel.y + 1);
            return {
                done: this._pixel.y > this._y2,
                value: this._pixel,
            };
        }
        return this._pixel.next();
    }
    [Symbol.iterator]() {
        return this;
    }
}
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