Function empty

docs/app/js/sanddance-app.js:121875–121877

()

        return this;
    },
    empty () {
        return this.x1 === +Number.MAX_VALUE && this.y1 === +Number.MAX_VALUE && this.x2 === -Number.MAX_VALUE && this.y2 === -Number.MAX_VALUE;
    },
    equals (b4) {
        return this.x1 === b4.x1 && this.y1 === b4.y1 && this.x2 === b4.x2 && this.y2 === b4.y2;
    },