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openspec/specs/responsive-chart-layout/spec.md
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openspec/specs/responsive-chart-layout/spec.md
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---
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title: 响应式图表布局规格
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author: AI Assistant
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date: 2026-02-16
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---
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## ADDED Requirements
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### Requirement: 容器自适应
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BaseChart 组件 SHALL 自动适应父容器大小。
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#### Scenario: 容器大小变化
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- **WHEN** 父容器大小发生变化
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- **THEN** 图表 SHALL 自动调整尺寸
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- **AND** 使用 ResizeObserver 进行监听
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- **AND** 图表 SHALL 保持比例不失真
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#### Scenario: 横竖屏切换
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- **WHEN** 移动设备从竖屏切换到横屏
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- **THEN** 图表 SHALL 在 300ms 内完成重绘
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- **AND** 所有元素 SHALL 保持可读性
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### Requirement: 触控交互优化
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图表 SHALL 针对移动设备触控操作进行优化。
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#### Scenario: 悬停效果增强
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- **WHEN** 用户悬停/触摸饼图扇区
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- **THEN** `hoverOffset` SHALL 为 8px(比默认值大)
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- **AND** 过渡动画 SHALL 流畅自然
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#### Scenario: 折线图点触控
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- **WHEN** 用户触摸折线图数据点
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- **THEN** 点的 `pointHoverRadius` SHALL 为 6px
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- **AND** 触控目标 SHALL 足够大(最小 44px)
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### Requirement: 空状态处理
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图表组件 SHALL 优雅处理空数据情况。
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#### Scenario: 无数据时显示空状态
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- **WHEN` 传入的数据为空数组或 datasets 为空
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- **THEN** 显示 VanEmpty 组件
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- **AND** 显示文案 "暂无数据"
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#### Scenario: 加载状态
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- **WHEN** `loading` prop 为 true
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- **THEN** 显示 VanLoading 组件
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- **AND** 显示文案 "加载中..."
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### Requirement: 最小高度限制
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图表容器 SHALL 有最小高度限制以确保可读性。
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#### Scenario: 小容器适配
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- **WHEN** 父容器高度小于 200px
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- **THEN** 图表 SHALL 使用 200px 作为最小高度
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- **AND** SHALL 显示滚动条或缩放提示
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## MODIFIED Requirements
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无修改的现有需求。
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## REMOVED Requirements
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无删除的需求。
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