chore(examples): add old api examples

example/src_oldapi/Edges/CustomEdge.tsx

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+import { FC } from 'react';
+import { EdgeProps, getBezierPath, getMarkerEnd } from 'react-flow-renderer';
+
+const CustomEdge: FC<EdgeProps> = ({
+  id,
+  sourceX,
+  sourceY,
+  targetX,
+  targetY,
+  sourcePosition,
+  targetPosition,
+  data,
+  arrowHeadType,
+  markerEndId,
+}) => {
+  const edgePath = getBezierPath({ sourceX, sourceY, sourcePosition, targetX, targetY, targetPosition });
+  const markerEnd = getMarkerEnd(arrowHeadType, markerEndId);
+
+  return (
+    <>
+      <path id={id} className="react-flow__edge-path" d={edgePath} markerEnd={markerEnd} />
+      <text>
+        <textPath href={`#${id}`} style={{ fontSize: '12px' }} startOffset="50%" textAnchor="middle">
+          {data.text}
+        </textPath>
+      </text>
+    </>
+  );
+};
+
+export default CustomEdge;

example/src_oldapi/Edges/CustomEdge2.tsx

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+import { FC } from 'react';
+import { EdgeProps, getBezierPath, getMarkerEnd, EdgeText, getEdgeCenter } from 'react-flow-renderer';
+
+const CustomEdge: FC<EdgeProps> = ({
+  id,
+  sourceX,
+  sourceY,
+  targetX,
+  targetY,
+  sourcePosition,
+  targetPosition,
+  data,
+  arrowHeadType,
+  markerEndId,
+}) => {
+  const edgePath = getBezierPath({ sourceX, sourceY, sourcePosition, targetX, targetY, targetPosition });
+  const markerEnd = getMarkerEnd(arrowHeadType, markerEndId);
+  const [centerX, centerY] = getEdgeCenter({
+    sourceX,
+    sourceY,
+    targetX,
+    targetY,
+  });
+
+  return (
+    <>
+      <path id={id} className="react-flow__edge-path" d={edgePath} markerEnd={markerEnd} />
+      <EdgeText
+        x={centerX}
+        y={centerY}
+        label={data.text}
+        labelStyle={{ fill: 'white' }}
+        labelShowBg
+        labelBgStyle={{ fill: 'red' }}
+        labelBgPadding={[2, 4]}
+        labelBgBorderRadius={2}
+        onClick={() => console.log(data)}
+      />
+      ;
+    </>
+  );
+};
+
+export default CustomEdge;

example/src_oldapi/Edges/index.tsx

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+import React, { useState, MouseEvent } from 'react';
+
+import ReactFlow, {
+  removeElements,
+  addEdge,
+  MiniMap,
+  Controls,
+  Background,
+  OnLoadParams,
+  FlowElement,
+  EdgeTypesType,
+  Elements,
+  Connection,
+  Edge,
+  ArrowHeadType,
+  Node,
+} from 'react-flow-renderer';
+
+import CustomEdge from './CustomEdge';
+import CustomEdge2 from './CustomEdge2';
+
+const onLoad = (reactFlowInstance: OnLoadParams) => reactFlowInstance.fitView();
+const onNodeDragStop = (_: MouseEvent, node: Node) => console.log('drag stop', node);
+const onElementClick = (_: MouseEvent, element: FlowElement) => console.log('click', element);
+
+const initialElements: Elements = [
+  { id: '1', type: 'input', data: { label: 'Input 1' }, position: { x: 250, y: 0 } },
+  { id: '2', data: { label: 'Node 2' }, position: { x: 150, y: 100 } },
+  { id: '2a', data: { label: 'Node 2a' }, position: { x: 0, y: 180 } },
+  { id: '3', data: { label: 'Node 3' }, position: { x: 250, y: 200 } },
+  { id: '4', data: { label: 'Node 4' }, position: { x: 400, y: 300 } },
+  { id: '3a', data: { label: 'Node 3a' }, position: { x: 150, y: 300 } },
+  { id: '5', data: { label: 'Node 5' }, position: { x: 250, y: 400 } },
+  { id: '6', type: 'output', data: { label: 'Output 6' }, position: { x: 50, y: 550 } },
+  { id: '7', type: 'output', data: { label: 'Output 7' }, position: { x: 250, y: 550 } },
+  { id: '8', type: 'output', data: { label: 'Output 8' }, position: { x: 525, y: 600 } },
+  { id: '9', type: 'output', data: { label: 'Output 9' }, position: { x: 675, y: 500 } },
+  { id: 'e1-2', source: '1', target: '2', label: 'bezier edge (default)', className: 'normal-edge' },
+  { id: 'e2-2a', source: '2', target: '2a', type: 'smoothstep', label: 'smoothstep edge' },
+  { id: 'e2-3', source: '2', target: '3', type: 'step', label: 'step edge' },
+  { id: 'e3-4', source: '3', target: '4', type: 'straight', label: 'straight edge' },
+  { id: 'e3-3a', source: '3', target: '3a', type: 'straight', label: 'label only edge', style: { stroke: 'none' } },
+  { id: 'e3-5', source: '4', target: '5', animated: true, label: 'animated styled edge', style: { stroke: 'red' } },
+  {
+    id: 'e5-6',
+    source: '5',
+    target: '6',
+    label: (
+      <>
+        <tspan>i am using</tspan>
+        <tspan dy={10} x={0}>
+          {'<tspan>'}
+        </tspan>
+      </>
+    ),
+    labelStyle: { fill: 'red', fontWeight: 700 },
+    arrowHeadType: ArrowHeadType.Arrow,
+  },
+  {
+    id: 'e5-7',
+    source: '5',
+    target: '7',
+    label: 'label with styled bg',
+    labelBgPadding: [8, 4],
+    labelBgBorderRadius: 4,
+    labelBgStyle: { fill: '#FFCC00', color: '#fff', fillOpacity: 0.7 },
+    arrowHeadType: ArrowHeadType.ArrowClosed,
+  },
+  {
+    id: 'e5-8',
+    source: '5',
+    target: '8',
+    type: 'custom',
+    data: { text: 'custom edge' },
+    arrowHeadType: ArrowHeadType.ArrowClosed,
+  },
+  {
+    id: 'e5-9',
+    source: '5',
+    target: '9',
+    type: 'custom2',
+    data: { text: 'custom edge 2' },
+  },
+];
+
+const edgeTypes: EdgeTypesType = {
+  custom: CustomEdge,
+  custom2: CustomEdge2,
+};
+
+const EdgesFlow = () => {
+  const [elements, setElements] = useState<Elements>(initialElements);
+
+  const onElementsRemove = (elementsToRemove: Elements) => setElements((els) => removeElements(elementsToRemove, els));
+  const onConnect = (params: Connection | Edge) => setElements((els) => addEdge(params, els));
+
+  return (
+    <ReactFlow
+      elements={elements}
+      onElementClick={onElementClick}
+      onElementsRemove={onElementsRemove}
+      onConnect={onConnect}
+      onNodeDragStop={onNodeDragStop}
+      onLoad={onLoad}
+      snapToGrid={true}
+      edgeTypes={edgeTypes}
+    >
+      <MiniMap />
+      <Controls />
+      <Background />
+    </ReactFlow>
+  );
+};
+
+export default EdgesFlow;