workflow/node_modules/@antv/x6/es/registry/connector/loop.js

import { Path, Point } from '@antv/x6-geometry';
export const loop = function (sourcePoint, targetPoint, routePoints, options = {}) {
    const fix = routePoints.length === 3 ? 0 : 1;
    const p1 = Point.create(routePoints[0 + fix]);
    const p2 = Point.create(routePoints[2 + fix]);
    const center = Point.create(routePoints[1 + fix]);
    if (!Point.equals(sourcePoint, targetPoint)) {
        const middle = new Point((sourcePoint.x + targetPoint.x) / 2, (sourcePoint.y + targetPoint.y) / 2);
        const angle = middle.angleBetween(Point.create(sourcePoint).rotate(90, middle), center);
        if (angle > 1) {
            p1.rotate(180 - angle, middle);
            p2.rotate(180 - angle, middle);
            center.rotate(180 - angle, middle);
        }
    }
    const pathData = `
     M ${sourcePoint.x} ${sourcePoint.y}
     Q ${p1.x} ${p1.y} ${center.x} ${center.y}
     Q ${p2.x} ${p2.y} ${targetPoint.x} ${targetPoint.y}
  `;
    return options.raw ? Path.parse(pathData) : pathData;
};
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