Method rect

docs/app/js/sanddance-app.js:140285–140287

(x, y, w, h)

        this._ += `A${r},${r},0,1,1,${x - r},${y}A${r},${r},0,1,1,${this._x1 = x0},${this._y1 = y0}`;
    }
    rect(x, y, w, h) {
        this._ += `M${this._x0 = this._x1 = +x},${this._y0 = this._y1 = +y}h${+w}v${+h}h${-w}Z`;
    }
    value() {
        return this._ || null;
    }