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fix(kline): 修正最新K线居中逻辑 

K线从屏幕左边开始画，通过leftOffset偏移使最新K线显示在展示区中央。

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
hailin 2026-01-19 19:57:32 -08:00
parent ccbea74f87
commit 5dfef3172e
1 changed files with 8 additions and 4 deletions
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12
frontend/mining-app/lib/presentation/widgets/kline_chart/kline_chart_widget.dart
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@ -584,12 +584,16 @@ class _KlineChartWidgetState extends State<KlineChartWidget> {
final totalWidth = widget.klines.length * _candleWidth;
// 计算左侧偏移量：当K线总宽度小于可用宽度时，让最新K线（最右边）居中显示
// 最新K线位置 = totalWidth - candleWidth/2（最后一根K线的中心点）
// 居中偏移 = 屏幕中心 - 最新K线位置 = availableWidth/2 - (totalWidth - candleWidth/2)
// K线从左边开始画，第一根K线在 x=0，最后一根K线中心在 x=(n-1)*candleWidth + candleWidth/2
// 我们要让最后一根K线的中心位于屏幕中央 (availableWidth/2)
// 所以：leftOffset + (n-1)*candleWidth + candleWidth/2 = availableWidth/2
// leftOffset = availableWidth/2 - (n-1)*candleWidth - candleWidth/2
// leftOffset = availableWidth/2 - n*candleWidth + candleWidth/2
// leftOffset = (availableWidth - totalWidth + candleWidth) / 2
double leftOffset = 0.0;
if (totalWidth < availableWidth) {
// 让最新K线居中：偏移量 = 屏幕中心 - 最新K线中心位置
leftOffset = (availableWidth / 2) - (totalWidth - _candleWidth / 2);
final lastKlineCenter = (widget.klines.length - 1) * _candleWidth + _candleWidth / 2;
leftOffset = (availableWidth / 2) - lastKlineCenter;
}
// 根据滚动位置计算可见的K线范围