private updateEdge(fromX: number, fromY: number, toX: number, toY: number): void {
const subEdges = this.edgeGroup!.children as HTMLCollectionOf<SVGPathElement>;
private updateEdge(fromX: number, fromY: number, toX: number, toY: number): void {
const subEdges = this.edgeGroup!.children as HTMLCollectionOf<SVGPathElement>;