From f149c2a06a2c520c37f53e1a998ac958b7c41e2f Mon Sep 17 00:00:00 2001
From: hailin <hailin.zhao@gdzx.xyz>
Date: Mon, 19 Jan 2026 20:39:33 -0800
Subject: [PATCH] =?UTF-8?q?fix(kline):=20=E6=95=B0=E6=8D=AE=E9=87=8F?=
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 .../kline_chart/kline_chart_widget.dart       | 22 ++++++++++++++-----
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_chart_widget.dart b/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_chart_widget.dart
index 32c9d7ec..0cd5b451 100644
--- a/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_chart_widget.dart
+++ b/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_chart_widget.dart
@@ -568,19 +568,29 @@ class _KlineChartWidgetState extends State<KlineChartWidget> {
     });
   }
 
-  // 数据处理 - 基于像素滚动计算可见数据
+  // 数据处理 - 计算要显示的K线数据
+  // 逻辑：最新K线在屏幕中心，只取中心到左边缘能显示的数量
   _VisibleData _getVisibleData(double chartWidth) {
     if (widget.klines.isEmpty || chartWidth == 0) {
       return _VisibleData(klines: [], startIndex: 0, candleWidth: _candleWidth);
     }
 
-    // 根据滚动位置计算可见的K线范围
-    final int startIndex = (_scrollX / _candleWidth).floor().clamp(0, widget.klines.length - 1);
-    final int visibleCount = (chartWidth / _candleWidth).ceil() + 1;  // +1 确保边缘K线可见
-    final int endIndex = math.min(startIndex + visibleCount, widget.klines.length);
+    // 计算屏幕中心到左边缘能显示多少根K线
+    final int halfScreenCount = (chartWidth / 2 / _candleWidth).ceil();
 
+    // 数据量不够半屏时，显示全部
+    if (widget.klines.length <= halfScreenCount) {
+      return _VisibleData(
+        klines: widget.klines,
+        startIndex: 0,
+        candleWidth: _candleWidth,
+      );
+    }
+
+    // 数据量足够时，只取最近的 halfScreenCount 根，让最新那根在屏幕中心
+    final int startIndex = widget.klines.length - halfScreenCount;
     return _VisibleData(
-      klines: widget.klines.sublist(startIndex, endIndex),
+      klines: widget.klines.sublist(startIndex),
       startIndex: startIndex,
       candleWidth: _candleWidth,
     );