@ichigo_san/graphing/dist/components/edges/floatingUtils.js

A lightweight UML-style diagram editor built with React Flow and Tailwind CSS

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getEdgeParams = getEdgeParams;
var _reactflow = require("reactflow");
// Calculate intersection point of the line between node centers and the target node
function getNodeIntersection(intersectionNode, targetNode) {
  var _intersectionNode$__r;
  const {
    width: sourceWidth = 0,
    height: sourceHeight = 0
  } = (_intersectionNode$__r = intersectionNode.__rf) !== null && _intersectionNode$__r !== void 0 && _intersectionNode$__r.width ? {
    width: intersectionNode.__rf.width,
    height: intersectionNode.__rf.height
  } : intersectionNode.measured || {};
  const intersectionPos = intersectionNode.positionAbsolute || intersectionNode.position || {
    x: 0,
    y: 0
  };
  const targetPosition = targetNode.positionAbsolute || targetNode.position || {
    x: 0,
    y: 0
  };
  const w = sourceWidth / 2;
  const h = sourceHeight / 2;
  if (w === 0 || h === 0) {
    // Node dimensions not yet available
    return intersectionPos;
  }
  const x2 = intersectionPos.x + w;
  const y2 = intersectionPos.y + h;
  const x1 = targetPosition.x + w;
  const y1 = targetPosition.y + h;
  const xx1 = (x1 - x2) / (2 * w) - (y1 - y2) / (2 * h);
  const yy1 = (x1 - x2) / (2 * w) + (y1 - y2) / (2 * h);
  const a = 1 / (Math.abs(xx1) + Math.abs(yy1));
  const xx3 = a * xx1;
  const yy3 = a * yy1;
  const x = w * (xx3 + yy3) + x2;
  const y = h * (-xx3 + yy3) + y2;
  return {
    x,
    y
  };
}
function getEdgePosition(node, intersectionPoint) {
  var _n$measured, _node$__rf, _n$measured2, _node$__rf2;
  const n = {
    ...node.position,
    ...node
  };
  const nx = Math.round(n.x);
  const ny = Math.round(n.y);
  const px = Math.round(intersectionPoint.x);
  const py = Math.round(intersectionPoint.y);
  if (px <= nx + 1) {
    return _reactflow.Position.Left;
  }
  if (px >= nx + (((_n$measured = n.measured) === null || _n$measured === void 0 ? void 0 : _n$measured.width) ?? ((_node$__rf = node.__rf) === null || _node$__rf === void 0 ? void 0 : _node$__rf.width) ?? 0) - 1) {
    return _reactflow.Position.Right;
  }
  if (py <= ny + 1) {
    return _reactflow.Position.Top;
  }
  if (py >= n.y + (((_n$measured2 = n.measured) === null || _n$measured2 === void 0 ? void 0 : _n$measured2.height) ?? ((_node$__rf2 = node.__rf) === null || _node$__rf2 === void 0 ? void 0 : _node$__rf2.height) ?? 0) - 1) {
    return _reactflow.Position.Bottom;
  }
  return _reactflow.Position.Top;
}
function getEdgeParams(source, target) {
  const sourceIntersectionPoint = getNodeIntersection(source, target);
  const targetIntersectionPoint = getNodeIntersection(target, source);
  const sourcePos = getEdgePosition(source, sourceIntersectionPoint);
  const targetPos = getEdgePosition(target, targetIntersectionPoint);
  return {
    sx: sourceIntersectionPoint.x,
    sy: sourceIntersectionPoint.y,
    tx: targetIntersectionPoint.x,
    ty: targetIntersectionPoint.y,
    sourcePos,
    targetPos
  };
}