feat: Add zoom controls and country flag display in GraphView for enhanced interactivity and visualization

frontend/src/GraphView.jsx

@@ -1,5 +1,6 @@
 import React, { useState, useRef, useEffect } from 'react';
 import * as d3 from 'd3';
+import { IconZoomIn, IconZoomOut, IconMaximize } from '@tabler/icons-react';
 
 function GraphView({ servers, connections }) {
   const [nodePositions, setNodePositions] = useState({});
@@ -69,13 +70,44 @@ function GraphView({ servers, connections }) {
     const g = d3.select(gRef.current);
     zoomRef.current = d3
       .zoom()
-        .scaleExtent([0.5, 2])
+        .scaleExtent([0.3, 3])
         .on('zoom', (event) => {
           g.attr('transform', event.transform);
         });
     svg.call(zoomRef.current);
   }, []);
 
+  // Контролы масштабирования
+  const zoomBy = (factor) => {
+    const svg = d3.select(svgRef.current);
+    svg.transition().duration(200).call(zoomRef.current.scaleBy, factor);
+  };
+
+  const fitToView = () => {
+    const svgEl = svgRef.current;
+    if (!svgEl) return;
+    const box = svgEl.getBoundingClientRect();
+    const padding = 40;
+    const positions = nodePositions;
+    const ids = Object.keys(positions);
+    if (ids.length === 0) return;
+    let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
+    ids.forEach((id) => {
+      const p = positions[id];
+      minX = Math.min(minX, p.x - NODE_WIDTH / 2);
+      minY = Math.min(minY, p.y - NODE_HEIGHT / 2);
+      maxX = Math.max(maxX, p.x + NODE_WIDTH / 2);
+      maxY = Math.max(maxY, p.y + NODE_HEIGHT / 2);
+    });
+    const contentW = Math.max(1, maxX - minX);
+    const contentH = Math.max(1, maxY - minY);
+    const scale = Math.max(0.5, Math.min(1.6, Math.min((box.width - padding) / contentW, (box.height - padding) / contentH)));
+    const tx = (box.width - scale * (minX + maxX)) / 2;
+    const ty = (box.height - scale * (minY + maxY)) / 2;
+    const t = d3.zoomIdentity.translate(tx, ty).scale(scale);
+    d3.select(svgEl).transition().duration(250).call(zoomRef.current.transform, t);
+  };
+
   if (servers.length === 0) {
     return (
       <div className="text-center py-5">
@@ -178,8 +210,16 @@ function GraphView({ servers, connections }) {
     return map[tunnelType] || { color: '#667382', dash: '5,5', width: 2 };
   };
 
+  // Флаг страны по ISO-2 (emoji). Для не-ISO-2 вернём код как есть
+  const getFlagEmoji = (countryCode) => {
+    if (!countryCode) return '';
+    const cc = String(countryCode).trim().toUpperCase();
+    if (cc.length !== 2) return cc; // например, SWE
+    return cc.replace(/./g, (ch) => String.fromCodePoint(127397 + ch.charCodeAt()));
+  };
+
   return (
-    <div style={{ width: '100%', height: '500px', border: '1px solid #e5e7eb', borderRadius: '8px', overflow: 'hidden', background: '#f8fafc' }}>
+    <div style={{ width: '100%', height: '500px', border: '1px solid #e5e7eb', borderRadius: '8px', overflow: 'hidden', background: '#f8fafc', position: 'relative' }}>
       <svg 
         ref={svgRef}
         width="100%" 
@@ -327,25 +367,34 @@ function GraphView({ servers, connections }) {
                 onMouseDown={(e) => handleMouseDown(e, server.ip)}
               />
               {/* Плашка страны */}
-              <rect
-                x={pos.x - NODE_WIDTH / 2 + 8}
-                y={pos.y - NODE_HEIGHT / 2 - 10}
-                rx={8}
-                ry={8}
-                width={28}
-                height={18}
-                fill={countryColor}
-              />
-              <text
-                x={pos.x - NODE_WIDTH / 2 + 22}
-                y={pos.y - NODE_HEIGHT / 2 + 3}
-                textAnchor="middle"
-                fontSize="10"
-                fill="#fff"
-                fontWeight="700"
-              >
-                {server.country}
-              </text>
+              {(() => {
+                const badgeX = pos.x - NODE_WIDTH / 2 + 8;
+                const badgeY = pos.y - NODE_HEIGHT / 2 - 10;
+                const flag = getFlagEmoji(server.country);
+                return (
+                  <g>
+                    <rect
+                      x={badgeX}
+                      y={badgeY}
+                      rx={8}
+                      ry={8}
+                      width={36}
+                      height={18}
+                      fill="#fff"
+                      stroke={countryColor}
+                    />
+                    <text
+                      x={badgeX + 18}
+                      y={badgeY + 12}
+                      textAnchor="middle"
+                      fontSize="12"
+                      dominantBaseline="middle"
+                    >
+                      {flag}
+                    </text>
+                  </g>
+                );
+              })()}
               {/* Название */}
               <text
                 x={pos.x}
@@ -384,6 +433,20 @@ function GraphView({ servers, connections }) {
         {/* Доп. определения добавлены выше */}
         </g>
       </svg>
+      {/* Контролы масштабирования */}
+      <div className="position-absolute" style={{ right: 10, top: 10 }}>
+        <div className="btn-group btn-group-sm">
+          <button className="btn btn-outline-secondary" onClick={() => zoomBy(1.2)} title="Увеличить">
+            <IconZoomIn size={16} />
+          </button>
+          <button className="btn btn-outline-secondary" onClick={() => zoomBy(1/1.2)} title="Уменьшить">
+            <IconZoomOut size={16} />
+          </button>
+          <button className="btn btn-outline-secondary" onClick={fitToView} title="Подогнать по окну">
+            <IconMaximize size={16} />
+          </button>
+        </div>
+      </div>
     </div>
   );
 }