workflow/node_modules/@antv/x6/es/registry/router/oneside.js

import { NumberExt } from '@antv/x6-common';
/**
 * Routes the edge always to/from a certain side
 */
export const oneSide = function (vertices, options, edgeView) {
    const side = options.side || 'bottom';
    const padding = NumberExt.normalizeSides(options.padding || 40);
    const sourceBBox = edgeView.sourceBBox;
    const targetBBox = edgeView.targetBBox;
    const sourcePoint = sourceBBox.getCenter();
    const targetPoint = targetBBox.getCenter();
    let coord;
    let dim;
    let factor;
    switch (side) {
        case 'top':
            factor = -1;
            coord = 'y';
            dim = 'height';
            break;
        case 'left':
            factor = -1;
            coord = 'x';
            dim = 'width';
            break;
        case 'right':
            factor = 1;
            coord = 'x';
            dim = 'width';
            break;
        case 'bottom':
        default:
            factor = 1;
            coord = 'y';
            dim = 'height';
            break;
    }
    // Move the points from the center of the element to outside of it.
    sourcePoint[coord] += factor * (sourceBBox[dim] / 2 + padding[side]);
    targetPoint[coord] += factor * (targetBBox[dim] / 2 + padding[side]);
    // Make edge orthogonal (at least the first and last vertex).
    if (factor * (sourcePoint[coord] - targetPoint[coord]) > 0) {
        targetPoint[coord] = sourcePoint[coord];
    }
    else {
        sourcePoint[coord] = targetPoint[coord];
    }
    return [sourcePoint.toJSON(), ...vertices, targetPoint.toJSON()];
};
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