From 86db174f89e2719b7ee3b1d35c4ae26906faa7bc Mon Sep 17 00:00:00 2001
From: plainheart <yhen@all-my-life.cn>
Date: Mon, 15 Jul 2024 17:11:09 +0800
Subject: [PATCH] perf(line): prebind context of `_changePolyState` function to
 current instance rather than create an new function to reduce runtime memory
 cost (fix #20151)

---
 src/chart/line/LineView.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/chart/line/LineView.ts b/src/chart/line/LineView.ts
index 9672eb720b..be4ff3571e 100644
--- a/src/chart/line/LineView.ts
+++ b/src/chart/line/LineView.ts
@@ -624,6 +624,8 @@ class LineView extends ChartView {
 
         this._symbolDraw = symbolDraw;
         this._lineGroup = lineGroup;
+
+        this._changePolyState = zrUtil.bind(this._changePolyState, this);
     }
 
     render(seriesModel: LineSeriesModel, ecModel: GlobalModel, api: ExtensionAPI) {
@@ -885,9 +887,7 @@ class LineView extends ChartView {
             toggleHoverEmphasis(polygon, focus, blurScope, emphasisDisabled);
         }
 
-        const changePolyState = (toState: DisplayState) => {
-            this._changePolyState(toState);
-        };
+        const changePolyState = this._changePolyState;
 
         data.eachItemGraphicEl(function (el) {
             // Switch polyline / polygon state if element changed its state.