From 2e1166d4230d532b02b75a753ff4f7b61c594c85 Mon Sep 17 00:00:00 2001
From: water <672684719@qq.com>
Date: Sun, 9 Aug 2026 22:16:58 +0800
Subject: [PATCH] fix(marker): respect markLine z2 when computing label z2 in
 traverseUpdateZ

When the user sets a `z2` value on a markLine, the label's `z2` should
reflect this value so the label stacks correctly relative to other
series elements. Currently, `traverseUpdateZ` only uses `-Infinity`
as the initial `maxZ2`, and the label's `z2` is computed as
`maxZ2 + 2` from child elements. If the child elements' z2 is not
set before `traverseUpdateZ` runs, the label gets a default z2 of 2.

This fix adds an optional `modelZ2` parameter to `traverseUpdateZ`
that seeds the `maxZ2` starting value, ensuring the label's z2 is
at least the model's z2 + 2. The marker `updateZ` function now
passes the marker model's `z2` to `traverseUpdateZ`.

Fixes #21650
---
 src/component/marker/MarkerView.ts | 3 ++-
 src/util/graphic.ts                | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/component/marker/MarkerView.ts b/src/component/marker/MarkerView.ts
index 51d4c2986a..c876e116c8 100644
--- a/src/component/marker/MarkerView.ts
+++ b/src/component/marker/MarkerView.ts
@@ -115,7 +115,8 @@ function updateZ(
 
         if (markerModel && markerDraw && markerDraw.group) {
             const { z, zlevel } = retrieveZInfo(markerModel);
-            traverseUpdateZ(markerDraw.group, z, zlevel);
+            const z2 = markerModel.get('z2');
+            traverseUpdateZ(markerDraw.group, z, zlevel, z2);
         }
     });
 }
diff --git a/src/util/graphic.ts b/src/util/graphic.ts
index 384c8394c6..3439a55bab 100644
--- a/src/util/graphic.ts
+++ b/src/util/graphic.ts
@@ -843,8 +843,9 @@ export function traverseUpdateZ(
     el: Element,
     z: number,
     zlevel: number,
+    modelZ2?: number,
 ): void {
-    doUpdateZ(el, z, zlevel, -Infinity);
+    doUpdateZ(el, z, zlevel, modelZ2 != null ? modelZ2 : -Infinity);
 }
 
 function doUpdateZ(