feat(connectionline): custom component option #516

example/src/CustomConnectionLine/ConnectionLine.js

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+import React from 'react';
+
+export default ({
+  sourceX,
+  sourceY,
+  sourcePosition,
+  targetX,
+  targetY,
+  targetPosition,
+  connectionLineType,
+  connectionLineStyle,
+}) => {
+  return (
+    <g>
+      <path
+        fill="none"
+        stroke="#222"
+        strokeWidth={1.5}
+        className="animated"
+        d={`M${sourceX},${sourceY} C ${sourceX} ${targetY} ${sourceX} ${targetY} ${targetX},${targetY}`}
+      />
+      <circle cx={targetX} cy={targetY} fill="#fff" r={3} stroke="#222" strokeWidth={1.5} />
+    </g>
+  );
+};

example/src/CustomConnectionLine/index.js

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+import React, { useState } from 'react';
+import ReactFlow, { removeElements, addEdge, Background } from 'react-flow-renderer';
+
+import ConnectionLine from './ConnectionLine';
+
+const initialElements = [{ id: '1', type: 'input', data: { label: 'Node 1' }, position: { x: 250, y: 5 } }];
+
+const ConnectionLineFlow = () => {
+  const [elements, setElements] = useState(initialElements);
+  const onElementsRemove = (elementsToRemove) => setElements((els) => removeElements(elementsToRemove, els));
+  const onConnect = (params) => setElements((els) => addEdge(params, els));
+
+  return (
+    <ReactFlow
+      elements={elements}
+      connectionLineComponent={ConnectionLine}
+      onElementsRemove={onElementsRemove}
+      onConnect={onConnect}
+    >
+      <Background variant="lines" />
+    </ReactFlow>
+  );
+};
+
+export default ConnectionLineFlow;