dmn-js-drd/lib/features/modeling/DrdLayouter.js

A decision requirements diagram view for dmn-js

import inherits from 'inherits-browser';
import BaseLayouter from 'diagram-js/lib/layout/BaseLayouter';
import { getMid, getOrientation } from 'diagram-js/lib/layout/LayoutUtil';
import { is } from 'dmn-js-shared/lib/util/ModelUtil';
import { assign } from 'min-dash';
var ADDITIONAL_WAYPOINT_DISTANCE = 20;
export default function DrdLayouter(connectionDocking) {
  this._connectionDocking = connectionDocking;
}
inherits(DrdLayouter, BaseLayouter);
DrdLayouter.$inject = ['connectionDocking'];
DrdLayouter.prototype.layoutConnection = function (connection, hints) {
  var connectionDocking = this._connectionDocking;
  if (!hints) {
    hints = {};
  }
  var source = hints.source || connection.source,
    target = hints.target || connection.target,
    waypoints = hints.waypoints || connection.waypoints || [],
    connectionStart = hints.connectionStart,
    connectionEnd = hints.connectionEnd,
    orientation = getOrientation(source, target);
  if (!connectionStart) {
    connectionStart = getConnectionDocking(waypoints[0], source);
  }
  if (!connectionEnd) {
    connectionEnd = getConnectionDocking(waypoints[waypoints.length - 1], target);
  }
  if (is(connection, 'dmn:InformationRequirement')) {
    waypoints = [connectionStart, connectionEnd];
    var croppedWaypoints = connectionDocking.getCroppedWaypoints(assign({}, connection, {
      waypoints: waypoints
    }), source, target);
    connectionEnd = croppedWaypoints.pop();
    var additionalWaypoint = {
      x: connectionEnd.x,
      y: connectionEnd.y
    };
    if (orientation.includes('bottom')) {
      additionalWaypoint.y += ADDITIONAL_WAYPOINT_DISTANCE;
    } else if (orientation.includes('top')) {
      additionalWaypoint.y -= ADDITIONAL_WAYPOINT_DISTANCE;
    } else if (orientation.includes('right')) {
      additionalWaypoint.x += ADDITIONAL_WAYPOINT_DISTANCE;
    } else {
      additionalWaypoint.x -= ADDITIONAL_WAYPOINT_DISTANCE;
    }
    waypoints = croppedWaypoints.concat([additionalWaypoint, connectionEnd]);
    return waypoints;
  }
  return [connectionStart, connectionEnd];
};
function getConnectionDocking(point, shape) {
  return point ? point.original || point : getMid(shape);
}
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