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frontend/src/pages/Workflow/Definition/Designer/components/Toolbar/index.tsx

@@ -136,14 +136,19 @@ const Toolbar: React.FC<ToolbarProps> = ({ graph }) => {
     // 缩放画布
     const zoom = (delta: number) => {
         if (!graph) return;
-        const zoom = graph.zoom();
-        graph.zoom(zoom + delta);
+        const currentZoom = graph.zoom();
+        const nextZoom = delta > 0 
+            ? Math.min(2, currentZoom + 0.1)  // 放大，最大2倍
+            : Math.max(0.5, currentZoom - 0.1);  // 缩小，最小0.5倍
+        graph.zoomTo(nextZoom);
+        graph.centerContent();  // 居中显示内容
     };
 
     // 适应画布
     const fitContent = () => {
         if (!graph) return;
-        graph.zoomToFit({ padding: 20 });
+        graph.zoomToFit({ padding: 20, maxScale: 2 });
+        graph.centerContent();
     };
 
     // 实际大小