1

frontend/src/pages/Workflow/Definition/Design/utils/layoutUtils.ts

@@ -25,13 +25,46 @@ const hasAllNodesPosition = (nodes: NodeData[]) => {
 };
 
 /**
- * 应用自动布局
+ * 居中显示并适应画布大小
+ * @param graph 图形实例
+ */
+const centerAndFit = (graph: Graph) => {
+    // 获取画布大小
+    const container = graph.container;
+    if (!container) return;
+
+    const containerBBox = container.getBoundingClientRect();
+    const padding = 40; // 设置更大的内边距
+
+    // 居中并缩放
+    graph.centerContent();
+    graph.zoomToFit({
+        padding,
+        maxScale: 1, // 限制最大缩放比例
+        minScale: 0.5, // 限制最小缩放比例
+    });
+
+    // 确保在视口中心
+    const graphBBox = graph.getBBox();
+    if (graphBBox) {
+        const tx = (containerBBox.width - graphBBox.width) / 2;
+        const ty = (containerBBox.height - graphBBox.height) / 2;
+        graph.translate(tx, ty);
+    }
+};
+
+/**
+ * 应用自动布局或居中显示
  * @param graph 图形实例
  * @param nodes 节点数据列表
  */
 export const applyAutoLayout = (graph: Graph, nodes: NodeData[] = []) => {
-    // 如果所有节点都有位置信息，则不应用自动布局
+    // 如果所有节点都有位置信息，只进行居中显示
     if (nodes.length > 0 && hasAllNodesPosition(nodes)) {
+        // 等待所有节点渲染完成后再居中
+        setTimeout(() => {
+            centerAndFit(graph);
+        }, 100);
         return;
     }
 
@@ -39,10 +72,10 @@ export const applyAutoLayout = (graph: Graph, nodes: NodeData[] = []) => {
     g.setGraph({
         rankdir: 'LR',
         align: 'UL',
-        ranksep: 80,
+        ranksep: 100, // 增加节点间距
-        nodesep: 50,
+        nodesep: 60,  // 增加节点间距
-        marginx: 20,
+        marginx: 40,  // 增加边距
-        marginy: 20,
+        marginy: 40,
     });
     g.setDefaultEdgeLabel(() => ({}));
 
@@ -67,11 +100,14 @@ export const applyAutoLayout = (graph: Graph, nodes: NodeData[] = []) => {
     // 应用布局结果
     graphNodes.forEach(node => {
         const nodeWithPosition = g.node(node.id);
+        if (nodeWithPosition) {
             node.position(
                 nodeWithPosition.x - nodeWithPosition.width / 2,
                 nodeWithPosition.y - nodeWithPosition.height / 2
             );
+        }
     });
 
-    graph.centerContent();
+    // 居中显示并适应画布
+    centerAndFit(graph);
 };