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

import { Curve, Path } from '@antv/x6-geometry';
export const smooth = function (sourcePoint, targetPoint, routePoints, options = {}) {
    let path;
    let direction = options.direction;
    if (routePoints && routePoints.length !== 0) {
        const points = [sourcePoint, ...routePoints, targetPoint];
        const curves = Curve.throughPoints(points);
        path = new Path(curves);
    }
    else {
        // If we have no route, use a default cubic bezier curve, cubic bezier
        // requires two control points, the control points have `x` midway
        // between source and target. This produces an S-like curve.
        path = new Path();
        path.appendSegment(Path.createSegment('M', sourcePoint));
        if (!direction) {
            direction =
                Math.abs(sourcePoint.x - targetPoint.x) >=
                    Math.abs(sourcePoint.y - targetPoint.y)
                    ? 'H'
                    : 'V';
        }
        if (direction === 'H') {
            const controlPointX = (sourcePoint.x + targetPoint.x) / 2;
            path.appendSegment(Path.createSegment('C', controlPointX, sourcePoint.y, controlPointX, targetPoint.y, targetPoint.x, targetPoint.y));
        }
        else {
            const controlPointY = (sourcePoint.y + targetPoint.y) / 2;
            path.appendSegment(Path.createSegment('C', sourcePoint.x, controlPointY, targetPoint.x, controlPointY, targetPoint.x, targetPoint.y));
        }
    }
    return options.raw ? path : path.serialize();
};
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