onMouseUp() {
if (!this.isMouseDown) return;
this.isMouseDown = false;
this.ellipse.setCoords();
this.ellipse.on('scaling', (o) => {
this.onScaling(o);
});
this.options.layer.canvas.setActiveObject(this.ellipse);
this.options.layer.canvas.renderAll();
this.options.layer.canvas.trigger('object:modified', {target: this.ellipse});
}