node_modules/dagre-d3-es/src/dagre-js/arrows.js

import * as util from './util.js';

export { arrows, setArrows };

var arrows = {
  normal,
  vee,
  undirected,
};

function setArrows(value) {
  arrows = value;
}

function normal(parent, id, edge, type) {
  var marker = parent
    .append('marker')
    .attr('id', id)
    .attr('viewBox', '0 0 10 10')
    .attr('refX', 9)
    .attr('refY', 5)
    .attr('markerUnits', 'strokeWidth')
    .attr('markerWidth', 8)
    .attr('markerHeight', 6)
    .attr('orient', 'auto');

  var path = marker
    .append('path')
    .attr('d', 'M 0 0 L 10 5 L 0 10 z')
    .style('stroke-width', 1)
    .style('stroke-dasharray', '1,0');
  util.applyStyle(path, edge[type + 'Style']);
  if (edge[type + 'Class']) {
    path.attr('class', edge[type + 'Class']);
  }
}

function vee(parent, id, edge, type) {
  var marker = parent
    .append('marker')
    .attr('id', id)
    .attr('viewBox', '0 0 10 10')
    .attr('refX', 9)
    .attr('refY', 5)
    .attr('markerUnits', 'strokeWidth')
    .attr('markerWidth', 8)
    .attr('markerHeight', 6)
    .attr('orient', 'auto');

  var path = marker
    .append('path')
    .attr('d', 'M 0 0 L 10 5 L 0 10 L 4 5 z')
    .style('stroke-width', 1)
    .style('stroke-dasharray', '1,0');
  util.applyStyle(path, edge[type + 'Style']);
  if (edge[type + 'Class']) {
    path.attr('class', edge[type + 'Class']);
  }
}

function undirected(parent, id, edge, type) {
  var marker = parent
    .append('marker')
    .attr('id', id)
    .attr('viewBox', '0 0 10 10')
    .attr('refX', 9)
    .attr('refY', 5)
    .attr('markerUnits', 'strokeWidth')
    .attr('markerWidth', 8)
    .attr('markerHeight', 6)
    .attr('orient', 'auto');

  var path = marker
    .append('path')
    .attr('d', 'M 0 5 L 10 5')
    .style('stroke-width', 1)
    .style('stroke-dasharray', '1,0');
  util.applyStyle(path, edge[type + 'Style']);
  if (edge[type + 'Class']) {
    path.attr('class', edge[type + 'Class']);
  }
}