How to use the @projectstorm/react-diagrams-core.PointModel function in @projectstorm/react-diagrams-core

calculatePositions(points: PointModel[], event: MouseEvent, index: number, coordinate: string) {
		// If path is first or last add another point to keep node port on its position
		if (index === 0) {
			let point = new PointModel({
				link: this.props.link,
				position: new Point(points[index].getX(), points[index].getY())
			});
			this.props.link.addPoint(point, index);
			this.dragging_index++;
			return;
		} else if (index === points.length - 2) {
			let point = new PointModel({
				link: this.props.link,
				position: new Point(points[index + 1].getX(), points[index + 1].getY())
			});
			this.props.link.addPoint(point, index + 1);
			return;
		}

		// Merge two points if it is not close to node port and close to each other

calculatePositions(points: PointModel[], event: MouseEvent, index: number, coordinate: string) {
		// If path is first or last add another point to keep node port on its position
		if (index === 0) {
			let point = new PointModel({
				link: this.props.link,
				position: new Point(points[index].getX(), points[index].getY())
			});
			this.props.link.addPoint(point, index);
			this.dragging_index++;
			return;
		} else if (index === points.length - 2) {
			let point = new PointModel({
				link: this.props.link,
				position: new Point(points[index + 1].getX(), points[index + 1].getY())
			});
			this.props.link.addPoint(point, index + 1);
			return;
		}

		// Merge two points if it is not close to node port and close to each other
		if (index - 2 > 0) {
			let _points = {
				[index - 2]: points[index - 2].getPosition(),
				[index + 1]: points[index + 1].getPosition(),
				[index - 1]: points[index - 1].getPosition()
			};
			if (Math.abs(_points[index - 1][coordinate] - _points[index + 1][coordinate]) < 5) {
				_points[index - 2][coordinate] = this.props.diagramEngine.getRelativeMousePoint(event)[coordinate];

}
				} else {
					if (this.props.link.getLastPathXdirection()) {
						points[i - 1].setPosition(points[i - 1].getX(), points[i].getY());
					} else {
						points[i - 1].setPosition(points[i].getX(), points[i - 1].getY());
					}
				}
			}
		}

		// If there is existing link which has two points add one
		// NOTE: It doesn't matter if check is for dy or dx
		if (points.length === 2 && dy !== 0 && !this.state.canDrag) {
			this.props.link.addPoint(
				new PointModel({
					link: this.props.link,
					position: new Point(pointLeft.getX(), pointRight.getY())
				})
			);
		}

		for (let j = 0; j < points.length - 1; j++) {
			paths.push(
				this.generateLink(
					LinkWidget.generateLinePath(points[j], points[j + 1]),
					{
						'data-linkid': this.props.link.getID(),
						'data-point': j,
						onMouseDown: (event: MouseEvent) => {
							if (event.button === 0) {
								this.setState({ canDrag: true });

g.edges().forEach(e => {
				const edge = g.edge(e);
				const link = model.getLink(e.name);

				const points = [link.getFirstPoint()];
				for (let i = 1; i < edge.points.length - 2; i++) {
					points.push(new PointModel({ link: link, position: new Point(edge.points[i].x, edge.points[i].y) }));
				}
				link.setPoints(points.concat(link.getLastPoint()));
			});
		}

addPointToLink(event: MouseEvent, index: number) {
		if (
			!event.shiftKey &&
			!this.props.link.isLocked() &&
			this.props.link.getPoints().length - 1 <= this.props.diagramEngine.getMaxNumberPointsPerLink()
		) {
			const point = new PointModel({
				link: this.props.link,
				position: this.props.diagramEngine.getRelativeMousePoint(event)
			});
			this.props.link.addPoint(point, index);
			event.persist();
			event.stopPropagation();
			this.forceUpdate(() => {
				this.props.diagramEngine.getActionEventBus().fireAction({
					event,
					model: point
				});
			});
		}
	}

[...Array(2)].forEach(item => {
				this.props.link.addPoint(
					new PointModel({
						link: this.props.link,
						position: new Point(pointLeft.getX(), pointRight.getY())
					}),
					1
				);
			});
			this.props.link.setManuallyFirstAndLastPathsDirection(true, true);