WIP components (as built)
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# 369 BurndownChart · 燃尽图
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## 用途
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燃尽图用于项目管理界面。
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## 最小示例
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```go
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remaining := []float64{40, 32, 25, 18}
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opts := mujica.BurndownChartOptions{Frame: mujica.ChartFrame{Label: "Release burndown"}, Start: mujica.Date{Year: 2026, Month: 10, Day: 1}, End: mujica.Date{Year: 2026, Month: 10, Day: 14}, Total: 40}
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view := func(c *ui.Context) {
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mujica.Use(c, mujica.Settings{})
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r := mujica.BurndownChart(c, remaining, opts)
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if r.Changed() {
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log.Println("point", r.Point)
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}
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if name, ok := r.Toggled(); ok {
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log.Println("series", name)
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}
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if r.Retried() {
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log.Println("retry")
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}
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}
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ui.Render(view, 1000, 700, 1)
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```
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## 参数
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`Frame` 提供必填 `Label`、默认 240 DIP `Height`、`Status/Error/Empty`;`Start < End`,`Total > 0`;`Format` 自定义读数;`Version` 刷新原地修改。
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## 状态
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业务状态由调用方持有;主题、密度与文本缩放遵循窗口设置。交互控件提供焦点、悬停和禁用状态;展示组件保留语义名称。
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## 事件
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`Changed()` 与 `Point` 返回活跃日期索引;`Toggled()` 返回图例名称;`Retried()` 请求重试。
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## 键盘操作
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Tab 聚焦图例与图表;Space 切换图例;方向键逐日读取;Home/End 首尾;Escape 清除读数。
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## 限制
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实际值以 `NaN` 表示缺失;数组从 Start 连续对应日期。数据加载与失败由调用方提供;数值须有限且非负。
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