feat: Implement force-directed layout and zoom functionality in GraphView for enhanced visualization and interactivity

frontend/src/GraphView.jsx

@@ -1,4 +1,5 @@
-import React, { useState, useRef } from 'react';
+import React, { useState, useRef, useEffect } from 'react';
+import * as d3 from 'd3';
 
 function GraphView({ servers, connections }) {
   const [nodePositions, setNodePositions] = useState({});
@@ -6,6 +7,47 @@ function GraphView({ servers, connections }) {
   const [dragOffset, setDragOffset] = useState({ x: 0, y: 0 });
   const [hoveredLinkId, setHoveredLinkId] = useState(null);
   const svgRef = useRef(null);
+  const gRef = useRef(null);
+
+  // Автоматическая раскладка (force-directed)
+  useEffect(() => {
+    if (!servers || servers.length === 0) return;
+
+    const nodes = servers.map((s) => ({ id: s.ip }));
+    const links = (connections || []).map((c) => ({ source: c.from, target: c.to, type: c.tunnelType }));
+
+    const distanceForType = (t) => ({ GRE: 200, IPSec: 220, WireGuard: 180, OpenVPN: 200 }[t] || 210);
+
+    const simulation = d3
+      .forceSimulation(nodes)
+      .force('link', d3.forceLink(links).id((d) => d.id).distance((d) => distanceForType(d.type)))
+      .force('charge', d3.forceManyBody().strength(-500))
+      .force('collide', d3.forceCollide(70))
+      .force('center', d3.forceCenter(450, 300))
+      .stop();
+
+    for (let i = 0; i < 300; i += 1) simulation.tick();
+
+    const pos = {};
+    nodes.forEach((n) => {
+      pos[n.id] = { x: n.x, y: n.y };
+    });
+    setNodePositions(pos);
+  }, [servers, connections]);
+
+  // Зум/панорамирование
+  useEffect(() => {
+    const svg = d3.select(svgRef.current);
+    const g = d3.select(gRef.current);
+    svg.call(
+      d3
+        .zoom()
+        .scaleExtent([0.5, 2])
+        .on('zoom', (event) => {
+          g.attr('transform', event.transform);
+        })
+    );
+  }, []);
 
   if (servers.length === 0) {
     return (
@@ -36,11 +78,11 @@ function GraphView({ servers, connections }) {
 
   // Обработчик начала перетаскивания
   const handleMouseDown = (e, serverIp) => {
-    const svg = svgRef.current;
-    const pt = svg.createSVGPoint();
+    const target = gRef.current || svgRef.current;
+    const pt = (gRef.current?.ownerSVGElement || svgRef.current).createSVGPoint();
     pt.x = e.clientX;
     pt.y = e.clientY;
-    const svgP = pt.matrixTransform(svg.getScreenCTM().inverse());
+    const svgP = pt.matrixTransform(target.getScreenCTM().inverse());
     
     const currentPos = nodePositions[serverIp] || getInitialNodePosition(
       servers.findIndex(s => s.ip === serverIp), 
@@ -57,12 +99,11 @@ function GraphView({ servers, connections }) {
   // Обработчик перетаскивания
   const handleMouseMove = (e) => {
     if (!draggedNode) return;
-    
-    const svg = svgRef.current;
-    const pt = svg.createSVGPoint();
+    const target = gRef.current || svgRef.current;
+    const pt = (gRef.current?.ownerSVGElement || svgRef.current).createSVGPoint();
     pt.x = e.clientX;
     pt.y = e.clientY;
-    const svgP = pt.matrixTransform(svg.getScreenCTM().inverse());
+    const svgP = pt.matrixTransform(target.getScreenCTM().inverse());
     
     setNodePositions(prev => ({
       ...prev,
@@ -148,6 +189,7 @@ function GraphView({ servers, connections }) {
             </feMerge>
           </filter>
         </defs>
+        <g ref={gRef}>
         {/* Связи */}
         {connections.map((connection, index) => {
           const fromServer = servers.find(s => s.ip === connection.from);
@@ -161,17 +203,26 @@ function GraphView({ servers, connections }) {
           const id = `${connection.from}-${connection.to}-${index}`;
           const isHovered = hoveredLinkId === id;
 
+          // Кривая линия с небольшим отступом от прямой для читаемости
+          const mx = (fromPos.x + toPos.x) / 2;
+          const my = (fromPos.y + toPos.y) / 2;
+          const dx = toPos.x - fromPos.x;
+          const dy = toPos.y - fromPos.y;
+          const len = Math.sqrt(dx * dx + dy * dy) || 1;
+          const nx = (-dy / len) * 30; // перпендикуляр, 30px
+          const ny = (dx / len) * 30;
+          const cx = mx + nx;
+          const cy = my + ny;
+
           return (
             <g key={`link-${index}`}
                onMouseEnter={() => setHoveredLinkId(id)}
                onMouseLeave={() => setHoveredLinkId(null)}
             >
               {/* Линия связи */}
-              <line
-                x1={fromPos.x}
-                y1={fromPos.y}
-                x2={toPos.x}
-                y2={toPos.y}
+              <path
+                d={`M ${fromPos.x} ${fromPos.y} Q ${cx} ${cy} ${toPos.x} ${toPos.y}`}
+                fill="none"
                 stroke={style.color}
                 strokeWidth={isHovered ? style.width + 1 : style.width}
                 strokeDasharray={style.dash}
@@ -182,8 +233,8 @@ function GraphView({ servers, connections }) {
               
               {/* Подпись связи */}
               <rect
-                x={(fromPos.x + toPos.x) / 2 - 40}
-                y={(fromPos.y + toPos.y) / 2 - 15}
+                x={mx - 50}
+                y={my - 35}
                 width="80"
                 height="30"
                 rx="15"
@@ -192,8 +243,8 @@ function GraphView({ servers, connections }) {
                 strokeWidth="1"
               />
               <text
-                x={(fromPos.x + toPos.x) / 2}
-                y={(fromPos.y + toPos.y) / 2}
+                x={mx - 10}
+                y={my - 18}
                 textAnchor="middle"
                 fontSize="11"
                 fill="#374151"
@@ -202,8 +253,8 @@ function GraphView({ servers, connections }) {
                 {connection.tunnelType}
               </text>
               <text
-                x={(fromPos.x + toPos.x) / 2}
-                y={(fromPos.y + toPos.y) / 2 + 15}
+                x={mx}
+                y={my - 3}
                 textAnchor="middle"
                 fontSize="9"
                 fill="#6b7280"
@@ -329,6 +380,7 @@ function GraphView({ servers, connections }) {
         })}
 
         {/* Доп. определения добавлены выше */}
+        </g>
       </svg>
     </div>
   );