fix(chart): retain axes in clean view

feat(chart): support fixed y-axis domains
2026-07-31 10:27:27 +08:00 · 2026-07-29 15:50:25 +08:00
24 changed files with 922 additions and 46 deletions
--- a/README.md
+++ b/README.md
@@ -12,6 +12,9 @@

 最新稳定版 Demo：<https://lqycustomsite.online/waveform-analysis/>

+本地运行 `pnpm dev` 后，可通过
+<http://127.0.0.1:5173/#/fixed-y-domain> 查看固定振幅上下限示例。
+
 ## 特性

 - Vue 3 Composition API + TypeScript，支持按需导入 `WaveformChart`
@@ -22,6 +25,7 @@
 - 缩放过程事件、缩放结束按可视区间加载和视口重置
 - 可选的空格拖拽平移，默认关闭并隔离多图表实例
 - 多系列图例、受控显隐、网格分页和最多四根 Y 轴
+- 自动 Y 轴范围，以及全局、按轨道或按系列配置的固定振幅范围
 - 按轨道控制水平/垂直网格线的显隐与颜色
 - 受控标注、右键编辑、拖拽避让和自定义颜色
 - 标题、图框、坐标轴、零值参考线、净图和渲染参数可配置
@@ -107,13 +111,15 @@ const data = ref<WaveformData>({
 | `minVisiblePoints`                | `number`                                    | `0`                                                     | 缩放后至少保留的不同 X 坐标数     |
 | `initialXDomain`                  | `[number, number]`                          | 未设置                                                  | 所有图框的初始 X 范围             |
 | `initialXDomains`                 | `Record<string, [number, number]>`          | 未设置                                                  | 按 track/series ID 配置初始范围   |
+| `yDomain`                         | `[number, number]`                          | 未设置                                                  | 所有波形的固定 Y 轴范围           |
+| `yDomains`                        | `Record<string, [number, number]>`          | 未设置                                                  | 按 track/series ID 配置固定范围   |
 | `grid`                            | `WaveformGridOptions`                       | `{ rowCount: 2, columnCount: 1, showPagination: true }` | 网格和分页                        |
 | `axes`                            | `WaveformAxesOptions`                       | 轴线均显示                                              | X/Y 轴基线显隐                    |
 | `rendering`                       | `WaveformRenderingOptions`                  | `{}`                                                    | 降采样与点/误差棒间距             |
 | `title` / `legend` / `frameStyle` | 对应公开类型                                | 未设置                                                  | 标题、图例和图框样式              |
 | `frameNumber`                     | `string \| number`                          | 未设置                                                  | 图框水印内容                      |
 | `zeroLine`                        | `WaveformZeroLineOptions`                   | `{ visible: false }`                                    | 零值参考线显隐与样式              |
-| `cleanView`                       | `boolean`                                   | `false`                                                 | 仅保留波形的净图模式              |
+| `cleanView`                       | `boolean`                                   | `false`                                                 | 保留波形、图框和刻度的净图模式    |
 | `presentationMode`                | `boolean`                                   | `false`                                                 | 禁用绘图区交互的展示模式          |
 | `annotations`                     | `WaveformAnnotation[]`                      | `[]`                                                    | 受控标注数据                      |
 | `annotationsVisible`              | `boolean`                                   | `true`                                                  | 标注图层显隐                      |
@@ -177,6 +183,38 @@ import 'waveform-analysis/style.css'
 </template>
 ```

+### 固定振幅上下限
+
+未传入 Y 轴范围时，组件继续根据当前可见系列及其误差棒自动计算范围。传入 `yDomain`
+后，所有波形使用同一个固定范围；超出范围的部分只在绘图区裁剪，不会过滤或修改原始数据：
+
+```vue
+<WaveformChart :data="chartData" :y-domain="[-80, 80]" />
+```
+
+多通道可以通过 `yDomains` 按稳定的 `trackId` 或 `seriesId` 分别配置：
+
+```vue
+<WaveformChart
+  :data="chartData"
+  :y-domain="[-100, 100]"
+  :y-domains="{
+    voltage: [-65, 65],
+    current: [-260, 260],
+  }"
+/>
+```
+
+范围优先级为 `trackId` 配置、`seriesId` 配置、全局 `yDomain`、数据自动范围。上下限必须
+是两个有限且不相等的数字；倒序范围会自动调整为升序，无效配置会回退到下一优先级。
+固定范围会精确作为坐标域使用，不会经过 D3 的 `nice()` 扩展。
+
+单值轴叠加模式会合并同一根轴上所有可见系列的有效范围；多值轴模式按系列分别使用配置，
+超过四根轴后复用第 4 根轴的系列会取范围并集。隐藏系列不参与公共范围合并。
+
+固定范围存在时，对应图框的 Y 轴不会被平移或视口重置覆盖；X 轴缩放、平移和重置保持原有
+行为。运行时更新或移除 `yDomain` / `yDomains` 会立即重新布局，移除后恢复自动范围。
+
 ### 缩放后按可视区间加载数据

 组件支持 Plotly 风格的矩形框选缩放：在 zoom 模式下按住鼠标左键拖拽，松开后同时缩放
@@ -411,9 +449,10 @@ scale 定位零线：
 `dash` 直接对应 SVG 的 `stroke-dasharray`；传入空字符串可显示实线。无效或非正数的
 `width` 会回退到 `1`。

-设置 `cleanView` 后，组件隐藏标题内容、图例、网格、坐标轴、轴标签、图框背景与边框、帧水印、
-零值参考线、标注和分页器，同时保留原图的标题区域、边距和波形尺寸。缩放、悬浮、十字线和
-tooltip 仍然可用，切换回普通模式后原有配置和标注不会丢失：
+设置 `cleanView` 后，组件保留波形、图框边框、X/Y 轴刻度及刻度值，并隐藏标题内容、图例、
+网格、轴标签、图框背景、帧水印、零值参考线、标注和分页器。原图的标题区域、边距和波形
+尺寸保持不变；缩放、悬浮、十字线和 tooltip 仍然可用，切换回普通模式后原有配置和标注
+不会丢失：

 ```vue
 <WaveformChart :data="chartData" :clean-view="cleanViewEnabled" />
@@ -589,7 +628,8 @@ X、Y 轴会根据各自完整显示域选择格式：最大绝对值在 `[0.01,
 - `src/index.ts`：组件库公开入口和工具函数导出
 - `src/components/WaveformChart.vue`：图表容器、缩放、tooltip、图例和标注编排
 - `src/components/{core,data,rendering,interaction,annotation}`：数据、布局、渲染和交互模块
- `src/App.vue`：可交互 demo，`src/data` 中提供示例波形数据
+- `src/App.vue`：综合可交互 demo，`src/data` 中提供示例波形数据
+- `src/router.ts`：Demo 路由；`src/views/FixedYDomainDemo.vue` 为固定振幅范围示例

 ## 本地开发

--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "waveform-analysis",
-  "version": "0.1.24",
+  "version": "0.1.26",
  "main": "./dist/index.cjs",
  "module": "./dist/index.js",
  "types": "./dist/types/index.d.ts",
@@ -38,6 +38,7 @@
  "dependencies": {
    "ant-design-vue": "3.2.20",
    "d3": "^7.9.0",
+    "vue-router": "^4.6.4",
    "vue3-colorpicker": "^2.3.0"
  },
  "peerDependencies": {
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -14,6 +14,9 @@ importers:
      d3:
        specifier: ^7.9.0
        version: 7.9.0
+      vue-router:
+        specifier: ^4.6.4
+        version: 4.6.4(vue@3.5.40(typescript@6.0.3))
      vue3-colorpicker:
        specifier: ^2.3.0
        version: 2.3.0(@aesoper/normal-utils@0.1.5)(@popperjs/core@2.11.8)(@vueuse/core@10.11.1(vue@3.5.40(typescript@6.0.3)))(gradient-parser@1.2.0)(lodash-es@4.18.1)(tinycolor2@1.6.0)(vue-types@4.2.1(vue@3.5.40(typescript@6.0.3)))(vue@3.5.40(typescript@6.0.3))
@@ -632,6 +635,9 @@ packages:
  '@vue/compiler-ssr@3.5.40':
    resolution: {integrity: sha512-rrE5xiXG663+vHCHa3J9p2z5OcBRjXmoqenprJxAFQxg5pSshzeBiCE6pu46axapRJ2Adk0YDA2BRZVjiHXnhg==}

+  '@vue/devtools-api@6.6.4':
+    resolution: {integrity: sha512-sGhTPMuXqZ1rVOk32RylztWkfXTRhuS7vgAKv0zjqk8gbsHkJ7xfFf+jbySxt7tWObEJwyKaHMikV/WGDiQm8g==}
+
  '@vue/language-core@3.3.7':
    resolution: {integrity: sha512-LzmkKinXAMMoh8Jfi/jMUSDUjuPdv8mynH5WJGKfXyZtDw3hQ6GBaoI6Bcnl/Xqlu32q/0Z6i/trp4VXykzyLw==}

@@ -1704,6 +1710,11 @@ packages:
    peerDependencies:
      eslint: ^8.57.0 || ^9.0.0 || ^10.0.0

+  vue-router@4.6.4:
+    resolution: {integrity: sha512-Hz9q5sa33Yhduglwz6g9skT8OBPii+4bFn88w6J+J4MfEo4KRRpmiNG/hHHkdbRFlLBOqxN8y8gf2Fb0MTUgVg==}
+    peerDependencies:
+      vue: ^3.5.0
+
  vue-tsc@3.3.7:
    resolution: {integrity: sha512-+C+rgD49wAQ5bUTl2sp5a8Bzg4YoldMNXM+g7CFe604MYcQ8PrZPMQhIjJSzKXtPBCa+C5ayMipqjbA7splekQ==}
    hasBin: true
@@ -2378,6 +2389,8 @@ snapshots:
      '@vue/compiler-dom': 3.5.40
      '@vue/shared': 3.5.40

+  '@vue/devtools-api@6.6.4': {}
+
  '@vue/language-core@3.3.7':
    dependencies:
      '@volar/language-core': 2.4.28
@@ -3386,6 +3399,11 @@ snapshots:
    transitivePeerDependencies:
      - supports-color

+  vue-router@4.6.4(vue@3.5.40(typescript@6.0.3)):
+    dependencies:
+      '@vue/devtools-api': 6.6.4
+      vue: 3.5.40(typescript@6.0.3)
+
  vue-tsc@3.3.7(typescript@6.0.3):
    dependencies:
      '@volar/typescript': 2.4.28
--- a/src/DemoRouterApp.vue
+++ b/src/DemoRouterApp.vue
@@ -0,0 +1,14 @@
+<template>
+  <div class="demo-shell">
+    <header class="demo-shell__header">
+      <RouterLink class="demo-shell__brand" to="/">Waveform Analysis</RouterLink>
+      <nav class="demo-shell__nav" aria-label="示例导航">
+        <RouterLink to="/">综合示例</RouterLink>
+        <RouterLink to="/fixed-y-domain">固定振幅范围</RouterLink>
+      </nav>
+    </header>
+    <div class="demo-shell__content">
+      <RouterView />
+    </div>
+  </div>
+</template>
--- a/src/components/core/fixedYDomainLayout.test.ts
+++ b/src/components/core/fixedYDomainLayout.test.ts
@@ -0,0 +1,116 @@
+import { zoomIdentity } from 'd3'
+import { describe, expect, it } from 'vitest'
+
+import { DEFAULT_WAVEFORM_RENDERING_OPTIONS } from '../../core'
+import type { DisplaySeries, DisplayTrack } from './types'
+import { buildTrackLayouts, resolveYAxisSeriesGroups } from './layout'
+
+function series(id: string, minimum: number, maximum: number): DisplaySeries {
+  return {
+    id,
+    name: id,
+    color: '#1677ff',
+    lineType: 'linear',
+    lineStyle: 'solid',
+    pointType: 'none',
+    errorBar: { visible: false, width: 1.5, capWidth: 8 },
+    points: [
+      { x: 0, y: minimum },
+      { x: 1, y: maximum },
+    ],
+    xDomain: [0, 1],
+    yDomain: [minimum, maximum],
+    hasErrorPoints: false,
+  }
+}
+
+function track(seriesList: DisplaySeries[]): DisplayTrack {
+  return {
+    id: 'track',
+    series: seriesList,
+    visibleSeries: seriesList,
+    xDomain: [0, 1],
+    yDomain: [0, 100],
+  }
+}
+
+describe('fixed Y-domain layout', () => {
+  it('uses an exact global fixed domain without applying nice bounds', () => {
+    const sourceTrack = track([series('a', 0, 100)])
+    const result = buildTrackLayouts({
+      cells: [
+        {
+          slotIndex: 0,
+          row: 0,
+          column: 0,
+          left: 0,
+          top: 0,
+          width: 120,
+          height: 100,
+          plotHeight: 100,
+          cellHeight: 130,
+          xAxisBand: 30,
+          series: sourceTrack,
+        },
+      ],
+      grid: { rowCount: 1, columnCount: 1, showPagination: false, trackLines: {} },
+      displayMode: 'independent',
+      overlayMode: 'single-axis',
+      independentTransforms: [zoomIdentity],
+      sharedZoomDomain: [0, 1],
+      fixedYDomain: [3, 97],
+      timeUnit: 'ms',
+      rendering: DEFAULT_WAVEFORM_RENDERING_OPTIONS,
+      hideSecondaryLabels: false,
+      yAxisLabelX: -50,
+      showCompactEmptyTracks: false,
+    })[0]
+
+    expect(result?.yScale.domain()).toEqual([3, 97])
+    expect(result?.yAxes[0]?.tickValues).toContain(3)
+    expect(result?.yAxes[0]?.tickValues).toContain(97)
+    expect(result?.seriesPaths[0]?.yScale.domain()).toEqual([3, 97])
+  })
+
+  it('resolves track, series, and global fixed-domain precedence', () => {
+    const sourceTrack = track([series('a', 0, 10), series('b', 20, 30)])
+
+    expect(
+      resolveYAxisSeriesGroups(sourceTrack, 'single-axis', [-5, 5], {
+        a: [-10, 10],
+        track: [300, 100],
+      })[0]?.domain,
+    ).toEqual([100, 300])
+
+    expect(
+      resolveYAxisSeriesGroups(sourceTrack, 'single-axis', [-5, 5], {
+        a: [-10, 10],
+      })[0]?.domain,
+    ).toEqual([-10, 10])
+  })
+
+  it('keeps per-series fixed domains on separate axes and merges axis overflow', () => {
+    const sourceTrack = track([
+      series('a', 0, 1),
+      series('b', 10, 11),
+      series('c', 20, 21),
+      series('d', 30, 31),
+      series('e', 40, 41),
+    ])
+    const groups = resolveYAxisSeriesGroups(sourceTrack, 'multi-axis', undefined, {
+      a: [-1, 1],
+      b: [-2, 2],
+      c: [-3, 3],
+      d: [-4, 4],
+      e: [-5, 5],
+    })
+
+    expect(groups.map((group) => group.domain)).toEqual([
+      [-1, 1],
+      [-2, 2],
+      [-3, 3],
+      [-5, 5],
+    ])
+    expect(groups.every((group) => group.fixed)).toBe(true)
+  })
+})
--- a/src/components/core/layout.ts
+++ b/src/components/core/layout.ts
@@ -4,6 +4,12 @@ import type { WaveformOverlayMode } from '../../types'
 import { formatScientificAxisExponent, formatScientificAxisLabel, paddedDomain } from '../../utils'
 import type { DisplaySeries, DisplayTrack, TrackLayout } from './types'
 import { MAX_MULTI_Y_AXIS_COUNT, Y_AXIS_EXPONENT_GAP } from './constants'
+import {
+  mergeYDomains,
+  resolveSeriesFixedYDomain,
+  resolveTrackFixedYDomain,
+  type WaveformYDomain,
+} from './yDomain'

 // 导出常量供外部使用
 export { MAX_MULTI_Y_AXIS_COUNT, Y_AXIS_EXPONENT_GAP } from './constants'
@@ -14,11 +20,12 @@ const Y_AXIS_OUTER_PADDING = 4
 const Y_AXIS_LABEL_GAP = 6
 const Y_AXIS_LABEL_BAND_WIDTH = 24

-interface YAxisSeriesGroup {
+export interface YAxisSeriesGroup {
  index: number
  side: 'left' | 'right'
  seriesList: DisplaySeries[]
  domain: [number, number]
+  fixed: boolean
 }

 function resolveAxisSides(axisCount: number): Array<'left' | 'right'> {
@@ -53,6 +60,7 @@ export function buildYAxisSeriesGroups(
    side: sides[index],
    seriesList: [] as DisplaySeries[],
    domain: [0, 1] as [number, number],
+    fixed: false,
  }))

  track.visibleSeries.forEach((series, index) => {
@@ -72,12 +80,35 @@ export function buildYAxisSeriesGroups(
  return grouped
 }

-export function axisTextMetrics(domain: [number, number]): {
+export function resolveYAxisSeriesGroups(
+  track: DisplayTrack,
+  overlayMode: WaveformOverlayMode,
+  yDomain?: WaveformYDomain,
+  yDomains?: Record<string, WaveformYDomain>,
+): YAxisSeriesGroup[] {
+  const trackDomain = resolveTrackFixedYDomain(track, yDomains)
+  return buildYAxisSeriesGroups(track, overlayMode).map((group) => {
+    if (trackDomain) return { ...group, domain: trackDomain, fixed: true }
+    const seriesDomains = group.seriesList.map(
+      (series) => resolveSeriesFixedYDomain(series, yDomain, yDomains) ?? series.yDomain,
+    )
+    const fixed = group.seriesList.some((series) =>
+      resolveSeriesFixedYDomain(series, yDomain, yDomains),
+    )
+    return fixed ? { ...group, domain: mergeYDomains(seriesDomains), fixed } : group
+  })
+}
+
+export function axisTextMetrics(
+  domain: [number, number],
+  nice = true,
+): {
  exponentLabel: string | null
  exponentWidth: number
  tickTextWidth: number
 } {
-  const scale = scaleLinear(domain, [1, 0]).nice()
+  const scale = scaleLinear(domain, [1, 0])
+  if (nice) scale.nice()
  const [axisMin, axisMax] = scale.domain()
  const values = scale.ticks(10)
  const maximumTickCharacters = Math.max(
@@ -92,15 +123,15 @@ export function axisTextMetrics(domain: [number, number]): {
  }
 }

-function axisExponentClearance(domain: [number, number]): number {
-  const { exponentLabel, exponentWidth } = axisTextMetrics(domain)
+function axisExponentClearance(domain: [number, number], nice: boolean): number {
+  const { exponentLabel, exponentWidth } = axisTextMetrics(domain, nice)
  return exponentLabel ? exponentWidth + Y_AXIS_EXPONENT_GAP : 0
 }

 export function measureYAxisGroupClearance(group: YAxisSeriesGroup): number {
  return (
-    axisTextMetrics(group.domain).tickTextWidth +
-    axisExponentClearance(group.domain) +
+    axisTextMetrics(group.domain, !group.fixed).tickTextWidth +
+    axisExponentClearance(group.domain, !group.fixed) +
    Y_AXIS_TICK_PADDING +
    Y_AXIS_LABEL_GAP +
    Y_AXIS_LABEL_BAND_WIDTH +
@@ -110,8 +141,8 @@ export function measureYAxisGroupClearance(group: YAxisSeriesGroup): number {

 function measureYAxisGroupTickClearance(group: YAxisSeriesGroup): number {
  return (
-    axisTextMetrics(group.domain).tickTextWidth +
-    axisExponentClearance(group.domain) +
+    axisTextMetrics(group.domain, !group.fixed).tickTextWidth +
+    axisExponentClearance(group.domain, !group.fixed) +
    Y_AXIS_TICK_PADDING +
    Y_AXIS_OUTER_PADDING
  )
@@ -120,8 +151,10 @@ function measureYAxisGroupTickClearance(group: YAxisSeriesGroup): number {
 export function measureTrackYAxisClearance(
  track: DisplayTrack,
  overlayMode: WaveformOverlayMode,
+  yDomain?: WaveformYDomain,
+  yDomains?: Record<string, WaveformYDomain>,
 ): { left: number; right: number } {
-  return buildYAxisSeriesGroups(track, overlayMode).reduce(
+  return resolveYAxisSeriesGroups(track, overlayMode, yDomain, yDomains).reduce(
    (clearance, group) => {
      clearance[group.side] +=
        overlayMode === 'multi-axis' || track.visibleSeries.length === 1
--- a/src/components/core/trackLayoutBuilder.ts
+++ b/src/components/core/trackLayoutBuilder.ts
@@ -19,7 +19,7 @@ import {
  type GridCellGeometry,
  type NormalizedWaveformGridOptions,
 } from './grid'
-import { axisTextMetrics, buildYAxisSeriesGroups } from './layout'
+import { axisTextMetrics, resolveYAxisSeriesGroups } from './layout'
 import type { DisplaySeries, DisplayTrack, TrackLayout, WaveformYAxisLayout } from './types'
 import { Y_AXIS_EXPONENT_GAP } from './constants'
 import {
@@ -42,6 +42,8 @@ export interface BuildTrackLayoutsOptions {
  sharedZoomDomain: [number, number]
  initialXDomain?: [number, number]
  initialXDomains?: Record<string, [number, number]>
+  fixedYDomain?: [number, number]
+  fixedYDomains?: Record<string, [number, number]>
  yDomains?: Record<string, [number, number]>
  timeUnit: 's' | 'ms'
  rendering: ResolvedWaveformRenderingOptions
@@ -94,13 +96,18 @@ export function buildTrackLayouts(options: BuildTrackLayoutsOptions): TrackLayou
        : zoomIdentity
    const xScale = transform.rescaleX(baseXScale)
    const configuredYDomain = options.yDomains?.[displayTrack.id]
-    const yAxisGroups = buildYAxisSeriesGroups(displayTrack, options.overlayMode).map((group) => ({
-      ...group,
-      domain: configuredYDomain ?? group.domain,
-    }))
+    const yAxisGroups = resolveYAxisSeriesGroups(
+      displayTrack,
+      options.overlayMode,
+      options.fixedYDomain,
+      options.fixedYDomains,
+    ).map((group) =>
+      !group.fixed && configuredYDomain ? { ...group, domain: configuredYDomain } : group,
+    )
    const sideOffsets = { left: 0, right: 0 }
    const yAxes: WaveformYAxisLayout[] = yAxisGroups.map((group) => {
-      const scale = scaleLinear(group.domain, [cell.plotHeight, 0]).nice()
+      const scale = scaleLinear(group.domain, [cell.plotHeight, 0])
+      if (!group.fixed) scale.nice()
      const majorTicks = scale.ticks(Math.max(2, Math.floor(cell.plotHeight / 55)))
      const [axisStart, axisEnd] = scale.domain()
      const showAxisEnd = options.displayMode !== 'compact' || cell.row === 0
@@ -110,7 +117,10 @@ export function buildTrackLayouts(options: BuildTrackLayoutsOptions): TrackLayou
      const tickValues = Array.from(
        new Set([axisStart, ...visibleMajorTicks, ...(showAxisEnd ? [axisEnd] : [])]),
      )
-      const { exponentLabel, exponentWidth, tickTextWidth } = axisTextMetrics(group.domain)
+      const { exponentLabel, exponentWidth, tickTextWidth } = axisTextMetrics(
+        group.domain,
+        !group.fixed,
+      )
      const exponentClearance = exponentLabel ? exponentWidth + Y_AXIS_EXPONENT_GAP : 0
      const clearance =
        tickTextWidth +
--- a/src/components/core/useWaveformChartController.ts
+++ b/src/components/core/useWaveformChartController.ts
@@ -6,6 +6,7 @@ import {
  shallowReactive,
  shallowRef,
  toRefs,
+  watch,
  watchEffect,
  type ComponentPublicInstance,
  type Ref,
@@ -68,6 +69,15 @@ export function useWaveformChartController(
  const annotationInteraction = useWaveformAnnotationInteraction()
  const editorSeriesOptions = ref<AnnotationSeriesCandidate[]>([])
  const hoverThrottle = useAnimationFrameThrottle()
+
+  watch(
+    [() => props.yDomain, () => props.yDomains],
+    () => {
+      sharedYDomains.value = {}
+      independentYDomains.value = {}
+    },
+    { deep: true },
+  )
  const selection = ref<ViewportSelectionState | null>(null)
  const spacePressed = ref(false)
  const pointerInsideChart = ref(false)
--- a/src/components/core/useWaveformLayout.ts
+++ b/src/components/core/useWaveformLayout.ts
@@ -26,7 +26,12 @@ import {
  resolveGridCellGeometry,
  X_AXIS_BAND,
 } from './grid'
-import { buildTrackLayouts, measureTrackYAxisClearance, Y_AXIS_EXPONENT_GAP } from './layout'
+import {
+  buildTrackLayouts,
+  measureTrackYAxisClearance,
+  resolveYAxisSeriesGroups,
+  Y_AXIS_EXPONENT_GAP,
+} from './layout'
 import type { DisplaySeries, DisplayTrack, TrackLayout } from './types'
 import type { PreparedWaveformSeries } from './useWaveformData'
 import type { ResolvedWaveformChartProps } from './waveformChartTypes'
@@ -104,8 +109,12 @@ export function useWaveformLayout(context: LayoutContext) {
  const yAxisMetrics = computed(() => {
    const axisText = chartTracks.value
      .filter((track) => track.visibleSeries.length > 0)
-      .map((track) => {
-        const scale = scaleLinear(track.yDomain, [1, 0]).nice()
+      .flatMap((track) =>
+        resolveYAxisSeriesGroups(track, props.overlayMode, props.yDomain, props.yDomains),
+      )
+      .map((group) => {
+        const scale = scaleLinear(group.domain, [1, 0])
+        if (!group.fixed) scale.nice()
        const [axisMin, axisMax] = scale.domain()
        return {
          exponentLabel: formatScientificAxisExponent(axisMin, axisMax),
@@ -165,7 +174,12 @@ export function useWaveformLayout(context: LayoutContext) {
  const multiAxisClearance = computed(() =>
    chartTracks.value.reduce(
      (maximum, track) => {
-        const clearance = measureTrackYAxisClearance(track, props.overlayMode)
+        const clearance = measureTrackYAxisClearance(
+          track,
+          props.overlayMode,
+          props.yDomain,
+          props.yDomains,
+        )
        return {
          left: Math.max(maximum.left, clearance.left),
          right: Math.max(maximum.right, clearance.right),
@@ -281,6 +295,8 @@ export function useWaveformLayout(context: LayoutContext) {
      sharedZoomDomain: sharedZoomDomain.value,
      initialXDomain: props.initialXDomain ? initialXDomain.value : undefined,
      initialXDomains: props.initialXDomains,
+      fixedYDomain: props.yDomain,
+      fixedYDomains: props.yDomains,
      yDomains:
        props.displayMode === 'independent'
          ? Object.fromEntries(
--- a/src/components/core/waveformChartTypes.ts
+++ b/src/components/core/waveformChartTypes.ts
@@ -31,6 +31,8 @@ export interface WaveformChartProps {
  minVisiblePoints?: number
  initialXDomain?: [number, number]
  initialXDomains?: Record<string, [number, number]>
+  yDomain?: [number, number]
+  yDomains?: Record<string, [number, number]>
  timeUnit?: 's' | 'ms'
  frameNumber?: string | number
  frameStyle?: WaveformFrameStyle
--- a/src/components/core/yDomain.test.ts
+++ b/src/components/core/yDomain.test.ts
@@ -0,0 +1,56 @@
+import { describe, expect, it } from 'vitest'
+
+import type { DisplayTrack } from './types'
+import { hasFixedYDomainForTrack, mergeYDomains, normalizeYDomain } from './yDomain'
+
+const track: DisplayTrack = {
+  id: 'shared-track',
+  series: [],
+  visibleSeries: [
+    {
+      id: 'channel-a',
+      name: 'A',
+      color: '#1677ff',
+      lineType: 'linear',
+      lineStyle: 'solid',
+      pointType: 'none',
+      errorBar: { visible: false, width: 1.5, capWidth: 8 },
+      points: [],
+      xDomain: [0, 1],
+      yDomain: [0, 1],
+      hasErrorPoints: false,
+    },
+  ],
+  xDomain: [0, 1],
+  yDomain: [0, 1],
+}
+
+describe('fixed Y domains', () => {
+  it('normalizes valid reversed domains', () => {
+    expect(normalizeYDomain([97, 3])).toEqual([3, 97])
+    expect(normalizeYDomain([-10, 10])).toEqual([-10, 10])
+  })
+
+  it.each([undefined, [1, 1], [Number.NaN, 1], [0, Number.POSITIVE_INFINITY]])(
+    'rejects an invalid domain: %j',
+    (domain) => {
+      expect(normalizeYDomain(domain as [number, number] | undefined)).toBeUndefined()
+    },
+  )
+
+  it('detects valid track, series, and global configuration only', () => {
+    expect(hasFixedYDomainForTrack(track, [-1, 1])).toBe(true)
+    expect(hasFixedYDomainForTrack(track, undefined, { 'shared-track': [-2, 2] })).toBe(true)
+    expect(hasFixedYDomainForTrack(track, undefined, { 'channel-a': [-3, 3] })).toBe(true)
+    expect(hasFixedYDomainForTrack(track, [0, 0], { 'channel-a': [1, 1] })).toBe(false)
+  })
+
+  it('merges configured and automatic series domains without padding', () => {
+    expect(
+      mergeYDomains([
+        [3, 97],
+        [-20, 40],
+      ]),
+    ).toEqual([-20, 97])
+  })
+})
--- a/src/components/core/yDomain.ts
+++ b/src/components/core/yDomain.ts
@@ -0,0 +1,50 @@
+import type { DisplaySeries, DisplayTrack } from './types'
+
+export type WaveformYDomain = [number, number]
+
+export function normalizeYDomain(
+  domain: readonly [number, number] | undefined,
+): WaveformYDomain | undefined {
+  if (
+    !domain ||
+    !Number.isFinite(domain[0]) ||
+    !Number.isFinite(domain[1]) ||
+    domain[0] === domain[1]
+  ) {
+    return undefined
+  }
+  return domain[0] < domain[1] ? [domain[0], domain[1]] : [domain[1], domain[0]]
+}
+
+export function resolveTrackFixedYDomain(
+  track: Pick<DisplayTrack, 'id'>,
+  yDomains?: Record<string, WaveformYDomain>,
+): WaveformYDomain | undefined {
+  return normalizeYDomain(yDomains?.[track.id])
+}
+
+export function resolveSeriesFixedYDomain(
+  series: Pick<DisplaySeries, 'id'>,
+  yDomain?: WaveformYDomain,
+  yDomains?: Record<string, WaveformYDomain>,
+): WaveformYDomain | undefined {
+  return normalizeYDomain(yDomains?.[series.id]) ?? normalizeYDomain(yDomain)
+}
+
+export function hasFixedYDomainForTrack(
+  track: Pick<DisplayTrack, 'id' | 'visibleSeries'>,
+  yDomain?: WaveformYDomain,
+  yDomains?: Record<string, WaveformYDomain>,
+): boolean {
+  return Boolean(
+    resolveTrackFixedYDomain(track, yDomains) ||
+    track.visibleSeries.some((series) => resolveSeriesFixedYDomain(series, yDomain, yDomains)),
+  )
+}
+
+export function mergeYDomains(domains: readonly WaveformYDomain[]): WaveformYDomain {
+  return [
+    Math.min(...domains.map((domain) => domain[0])),
+    Math.max(...domains.map((domain) => domain[1])),
+  ]
+}
--- a/src/components/interaction/useWaveformViewport.ts
+++ b/src/components/interaction/useWaveformViewport.ts
@@ -3,6 +3,7 @@ import { computed, nextTick, type ComputedRef, type Ref, type ShallowRef } from

 import { MINIMUM_SELECTION_SIZE } from '../core/constants'
 import type { DisplayTrack, TrackLayout } from '../core/types'
+import { hasFixedYDomainForTrack } from '../core/yDomain'
 import type {
  ResolvedWaveformChartProps,
  ViewportSelectionState,
@@ -190,9 +191,13 @@ export function useWaveformViewport(context: ViewportContext) {
    const nextIndependentDomains = { ...independentYDomains.value }
    const nextSharedDomains = { ...sharedYDomains.value }
    targets.forEach((target) => {
+      const chartTrack = chartTracks.value.find((item) => item.id === target.id)
+      if (chartTrack && hasFixedYDomainForTrack(chartTrack, props.yDomain, props.yDomains)) {
+        return
+      }
      const key = target.series.trackId ?? target.series.id
      const source = active.yDomains[key] ?? (target.yScale.domain() as [number, number])
-      const boundary = chartTracks.value.find((item) => item.id === key)?.yDomain ?? source
+      const boundary = chartTrack?.yDomain ?? source
      const ySpan = source[1] - source[0]
      const nextY = clampDomain(
        [source[0] + (dy / height) * ySpan, source[1] + (dy / height) * ySpan],
--- a/src/components/rendering/WaveformTrack.vue
+++ b/src/components/rendering/WaveformTrack.vue
@@ -94,7 +94,7 @@ const resolvedFrameStyle = computed(() => {
    />

    <rect
-      v-if="!track.isEmpty && !cleanView"
+      v-if="!track.isEmpty"
      class="waveform-track__plot-frame waveform-chart__plot-frame"
      :width="track.width ?? innerWidth"
      :height="track.height"
--- a/src/components/rendering/WaveformTrackAxes.vue
+++ b/src/components/rendering/WaveformTrackAxes.vue
@@ -103,14 +103,14 @@ watch(

 <template>
  <g
-    v-if="track.showXAxis && !cleanView"
+    v-if="track.showXAxis"
    ref="xAxisElement"
    class="waveform-track__axis waveform-track__axis--x waveform-chart__axis waveform-chart__axis--x"
    :class="{ 'waveform-track__axis--line-hidden': axes?.x?.lineVisible === false }"
    :transform="`translate(0, ${track.height})`"
  />
  <g
-    v-if="track.showXAxis && !cleanView"
+    v-if="track.showXAxis"
    class="waveform-track__axis-endpoints waveform-chart__axis-endpoints"
    :transform="`translate(0, ${track.height})`"
    font-family="sans-serif"
@@ -137,7 +137,7 @@ watch(
    </text>
  </g>
  <text
-    v-if="track.showXAxis && track.xAxisExponent && !cleanView"
+    v-if="track.showXAxis && track.xAxisExponent"
    class="waveform-track__axis-exponent waveform-track__axis-exponent--x waveform-chart__axis-exponent waveform-chart__axis-exponent--x"
    :x="track.width ?? innerWidth"
    :y="track.height + 27"
@@ -148,7 +148,7 @@ watch(
  </text>

  <g
-    v-for="axis in track.isEmpty || cleanView ? [] : track.yAxes"
+    v-for="axis in track.isEmpty ? [] : track.yAxes"
    :key="`y-axis-${track.index}-${axis.index}`"
    :ref="(element) => setYAxisElement(element, axis.index)"
    class="waveform-track__axis waveform-track__axis--y waveform-chart__axis waveform-chart__axis--y"
@@ -161,9 +161,7 @@ watch(
    :transform="`translate(${axis.x}, 0)`"
  />
  <text
-    v-for="axis in track.isEmpty || cleanView
-      ? []
-      : track.yAxes.filter((item) => item.exponentLabel)"
+    v-for="axis in track.isEmpty ? [] : track.yAxes.filter((item) => item.exponentLabel)"
    :key="`y-axis-exponent-${track.index}-${axis.index}`"
    class="waveform-track__axis-exponent waveform-track__axis-exponent--y waveform-chart__axis-exponent waveform-chart__axis-exponent--y"
    :data-y-axis-index="axis.index"
--- a/src/components/waveformChartCases/layoutAndDomains.test.ts
+++ b/src/components/waveformChartCases/layoutAndDomains.test.ts
@@ -294,6 +294,31 @@ describe('WaveformChart', () => {
    expect(wrapper.get('.waveform-chart__axis-endpoint--end').text()).toBe('1.00')
  })

+  it('reacts to exact fixed Y-domain props and returns to automatic bounds', async () => {
+    const wrapper = await mountSizedChart({
+      kind: 'points',
+      points: [
+        { x: 0, y: 0 },
+        { x: 1, y: 100 },
+      ],
+    })
+    const yTickLabels = () =>
+      wrapper
+        .get('.waveform-chart__axis--y')
+        .findAll('.tick text')
+        .map((tick) => tick.text())
+
+    await wrapper.setProps({ yDomain: [3, 97] })
+    await flushPromises()
+    expect(yTickLabels()).toContain('3.00')
+    expect(yTickLabels()).toContain('97.00')
+
+    await wrapper.setProps({ yDomain: undefined })
+    await flushPromises()
+    expect(yTickLabels()).not.toContain('3.00')
+    expect(yTickLabels()).not.toContain('97.00')
+  })
+
  it('keeps annotations bound to their channel while paging', async () => {
    const wrapper = await mountSizedChart(gridSeries(3), {
      grid: { rowCount: 1, columnCount: 1 },
--- a/src/components/waveformChartCases/presentationAndAxes.test.ts
+++ b/src/components/waveformChartCases/presentationAndAxes.test.ts
@@ -146,7 +146,7 @@ describe('WaveformChart', () => {
            kind: 'points',
            points: [
              { x: 0, y: -1 },
-              { x: 1, y: 1 },
+              { x: 10_000, y: 1 },
            ],
          },
        },
@@ -227,8 +227,8 @@ describe('WaveformChart', () => {
          data: {
            kind: 'points',
            points: [
-              { x: 0, y: 1 },
-              { x: 1, y: 2 },
+              { x: 0, y: 10_000 },
+              { x: 10_000, y: 20_000 },
            ],
          },
        },
@@ -239,7 +239,7 @@ describe('WaveformChart', () => {
            kind: 'points',
            points: [
              { x: 0, y: 2 },
-              { x: 1, y: 3 },
+              { x: 10_000, y: 3 },
            ],
          },
        },
@@ -252,6 +252,8 @@ describe('WaveformChart', () => {
      annotations: [{ id: 'note', seriesId: 'first', x: 0.5, y: 0, text: 'hidden note' }],
      zeroLine: { visible: true },
      title: { text: 'hidden title' },
+      axes: { x: { lineVisible: false }, y: { lineVisible: false } },
+      frameStyle: { borderColor: '#dc2626', borderWidth: 2, borderStyle: 'dashed' as const },
    }
    const regularWrapper = await mountSizedChart(data, sharedProps)
    const wrapper = await mountSizedChart(data, {
@@ -285,13 +287,31 @@ describe('WaveformChart', () => {
    expect(wrapper.find('.waveform-chart__overlay--independent').exists()).toBe(true)
    expect(wrapper.get('.waveform-chart__title-area').attributes('aria-hidden')).toBe('true')
    expect(wrapper.find('.waveform-chart__title-visual').exists()).toBe(false)
-    expect(wrapper.find('.waveform-chart__axis').exists()).toBe(false)
+    const xAxis = wrapper.get('.waveform-chart__axis--x')
+    const yAxes = wrapper.findAll('.waveform-chart__axis--y')
+    expect(yAxes).toHaveLength(2)
+    expect(xAxis.findAll('.tick line').length).toBeGreaterThan(0)
+    expect(xAxis.findAll('.tick text').length).toBeGreaterThan(0)
+    yAxes.forEach((axis) => {
+      expect(axis.findAll('.tick line').length).toBeGreaterThan(0)
+      expect(axis.findAll('.tick text').length).toBeGreaterThan(0)
+      expect(axis.get('path.domain').attributes('display')).toBe('none')
+    })
+    expect(xAxis.get('path.domain').attributes('display')).toBe('none')
+    expect(wrapper.findAll('.waveform-chart__axis-endpoint')).toHaveLength(2)
+    expect(wrapper.get('.waveform-chart__axis-exponent--x').text()).not.toBe('')
+    expect(wrapper.get('.waveform-chart__axis-exponent--y').text()).not.toBe('')
    expect(wrapper.find('.waveform-chart__grid').exists()).toBe(false)
-    expect(wrapper.find('.waveform-chart__plot-frame').exists()).toBe(false)
+    expect(wrapper.get('.waveform-chart__plot-frame').attributes()).toMatchObject({
+      stroke: '#dc2626',
+      'stroke-width': '2',
+      'stroke-dasharray': '6 4',
+    })
    expect(wrapper.find('.waveform-chart__plot-background').exists()).toBe(false)
    expect(wrapper.find('.waveform-chart__watermark').exists()).toBe(false)
    expect(wrapper.find('.waveform-chart__legend-layer').exists()).toBe(false)
    expect(wrapper.find('.waveform-chart__label').exists()).toBe(false)
+    expect(wrapper.find('.waveform-chart__y-axis-label').exists()).toBe(false)
    expect(wrapper.find('.waveform-chart__zero-line').exists()).toBe(false)
    expect(wrapper.find('.waveform-annotation-layer').exists()).toBe(false)
    expect(wrapper.find('.ant-pagination').exists()).toBe(false)
--- a/src/components/waveformChartCases/viewportBoxAndPan.test.ts
+++ b/src/components/waveformChartCases/viewportBoxAndPan.test.ts
@@ -224,6 +224,56 @@ describe('WaveformChart', () => {
    window.dispatchEvent(new KeyboardEvent('keyup', { code: 'Space' }))
  })

+  it('keeps a fixed Y domain through panning and viewport reset', async () => {
+    const wrapper = await mountSizedChart(
+      {
+        kind: 'points',
+        points: [
+          { x: 0, y: 0 },
+          { x: 1, y: 100 },
+        ],
+      },
+      { pannable: true, yDomain: [3, 97] },
+    )
+    const overlay = wrapper.get('.waveform-chart__overlay--independent')
+    const width = Number(overlay.attributes('width'))
+    const height = Number(overlay.attributes('height'))
+    Object.defineProperty(overlay.element, 'getBoundingClientRect', {
+      value: () => ({ left: 0, top: 0, width, height }),
+    })
+    const yTickLabels = () =>
+      wrapper
+        .get('.waveform-chart__axis--y')
+        .findAll('.tick text')
+        .map((tick) => tick.text())
+    const initialLabels = yTickLabels()
+
+    await wrapper.trigger('pointerenter')
+    window.dispatchEvent(new KeyboardEvent('keydown', { code: 'Space', cancelable: true }))
+    const down = new MouseEvent('pointerdown', {
+      button: 0,
+      clientX: width / 2,
+      clientY: height / 2,
+      bubbles: true,
+    })
+    Object.defineProperty(down, 'pointerId', { value: 34 })
+    overlay.element.dispatchEvent(down)
+    const move = new MouseEvent('pointermove', {
+      clientX: width / 2 + 20,
+      clientY: height / 2 + 40,
+      bubbles: true,
+    })
+    Object.defineProperty(move, 'pointerId', { value: 34 })
+    overlay.element.dispatchEvent(move)
+    await flushPromises()
+
+    expect(yTickLabels()).toEqual(initialLabels)
+    ;(wrapper.vm as unknown as { resetViewport: () => void }).resetViewport()
+    await flushPromises()
+    expect(yTickLabels()).toEqual(initialLabels)
+    window.dispatchEvent(new KeyboardEvent('keyup', { code: 'Space' }))
+  })
+
  it('does not activate pannable on a chart that the pointer is outside', async () => {
    const data: WaveformData = {
      kind: 'points',
--- a/src/demoRoutes.css
+++ b/src/demoRoutes.css
@@ -0,0 +1,197 @@
+.demo-shell {
+  display: grid;
+  grid-template-rows: 48px minmax(0, 1fr);
+  width: 100%;
+  height: 100%;
+  overflow: hidden;
+}
+
+.demo-shell__header {
+  z-index: 40;
+  display: flex;
+  gap: 24px;
+  align-items: center;
+  min-width: 0;
+  padding: 0 16px;
+  background: #fff;
+  border-bottom: 1px solid #e4e7ec;
+}
+
+.demo-shell__brand {
+  flex: 0 0 auto;
+  color: #101828;
+  font-size: 14px;
+  font-weight: 700;
+  text-decoration: none;
+}
+
+.demo-shell__nav {
+  display: flex;
+  align-self: stretch;
+  min-width: 0;
+}
+
+.demo-shell__nav a {
+  display: inline-flex;
+  align-items: center;
+  padding: 0 14px;
+  color: #475467;
+  font-size: 13px;
+  text-decoration: none;
+  border-bottom: 2px solid transparent;
+}
+
+.demo-shell__nav a:hover,
+.demo-shell__nav a:focus-visible,
+.demo-shell__nav a.router-link-exact-active {
+  color: #0958d9;
+}
+
+.demo-shell__nav a.router-link-exact-active {
+  background: #f0f7ff;
+  border-bottom-color: #1677ff;
+}
+
+.demo-shell__content {
+  min-width: 0;
+  min-height: 0;
+  overflow: hidden;
+}
+
+.fixed-domain-demo {
+  display: grid;
+  grid-template-rows: auto auto minmax(0, 1fr);
+  gap: 12px;
+  width: 100%;
+  height: 100%;
+  padding: 16px;
+  overflow: hidden;
+}
+
+.fixed-domain-demo__toolbar {
+  display: flex;
+  gap: 24px;
+  align-items: center;
+  justify-content: space-between;
+  min-width: 0;
+}
+
+.fixed-domain-demo__toolbar h1 {
+  margin: 0;
+  color: #101828;
+  font-size: 18px;
+  font-weight: 700;
+  letter-spacing: 0;
+}
+
+.fixed-domain-demo__toolbar p {
+  margin: 4px 0 0;
+  color: #667085;
+  font-size: 12px;
+}
+
+.fixed-domain-demo__range-controls {
+  display: flex;
+  gap: 16px;
+  align-items: center;
+  min-height: 48px;
+  padding: 8px 12px;
+  background: #fff;
+  border: 1px solid #e4e7ec;
+  border-radius: 6px;
+}
+
+.fixed-domain-demo__range-controls label {
+  display: flex;
+  gap: 8px;
+  align-items: center;
+  color: #475467;
+  font-size: 12px;
+}
+
+.fixed-domain-demo__range-controls .ant-input-number {
+  width: 112px;
+}
+
+.fixed-domain-demo__range-controls strong {
+  color: #344054;
+  font-size: 12px;
+}
+
+.fixed-domain-demo__range-controls strong:not(:first-child) {
+  padding-left: 16px;
+  border-left: 1px solid #e4e7ec;
+}
+
+.fixed-domain-demo__auto-state {
+  color: #667085;
+  font-size: 12px;
+}
+
+.fixed-domain-demo__chart {
+  min-width: 0;
+  min-height: 0;
+  overflow: hidden;
+}
+
+.fixed-domain-demo__chart > .waveform-chart {
+  min-height: 0;
+}
+
+@media (max-width: 900px) {
+  .demo-shell {
+    grid-template-rows: 44px minmax(0, 1fr);
+  }
+
+  .demo-shell__header {
+    gap: 8px;
+    padding: 0 8px;
+  }
+
+  .demo-shell__brand {
+    display: none;
+  }
+
+  .demo-shell__nav {
+    width: 100%;
+  }
+
+  .demo-shell__nav a {
+    flex: 1 1 0;
+    justify-content: center;
+    padding: 0 6px;
+  }
+
+  .fixed-domain-demo {
+    gap: 8px;
+    padding: 10px;
+  }
+
+  .fixed-domain-demo__toolbar {
+    display: grid;
+    gap: 8px;
+  }
+
+  .fixed-domain-demo__toolbar .ant-radio-group {
+    display: flex;
+    width: 100%;
+  }
+
+  .fixed-domain-demo__toolbar .ant-radio-button-wrapper {
+    flex: 1 1 0;
+    padding-inline: 6px;
+    text-align: center;
+  }
+
+  .fixed-domain-demo__range-controls {
+    flex-wrap: wrap;
+    gap: 8px 12px;
+  }
+
+  .fixed-domain-demo__range-controls strong:not(:first-child) {
+    width: 100%;
+    padding: 8px 0 0;
+    border-top: 1px solid #e4e7ec;
+    border-left: 0;
+  }
+}
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,7 +1,9 @@
 import { createApp } from 'vue'
 import 'ant-design-vue/dist/antd.css'

-import App from './App.vue'
+import DemoRouterApp from './DemoRouterApp.vue'
+import { router } from './router'
+import './demoRoutes.css'
 import './styles.css'

-createApp(App).mount('#app')
+createApp(DemoRouterApp).use(router).mount('#app')
--- a/src/router.ts
+++ b/src/router.ts
@@ -0,0 +1,21 @@
+import { createRouter, createWebHashHistory, type RouteRecordRaw } from 'vue-router'
+
+import App from './App.vue'
+
+export const routes: RouteRecordRaw[] = [
+  {
+    path: '/',
+    name: 'workspace',
+    component: App,
+  },
+  {
+    path: '/fixed-y-domain',
+    name: 'fixed-y-domain',
+    component: () => import('./views/FixedYDomainDemo.vue'),
+  },
+]
+
+export const router = createRouter({
+  history: createWebHashHistory(),
+  routes,
+})
--- a/src/styles.css
+++ b/src/styles.css
@@ -35,8 +35,7 @@ body {
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 12px;
  width: 100%;
-  height: 100vh;
-  height: 100dvh;
+  height: 100%;
  padding: 12px;
  overflow: hidden;
 }
--- a/src/views/FixedYDomainDemo.test.ts
+++ b/src/views/FixedYDomainDemo.test.ts
@@ -0,0 +1,44 @@
+import { flushPromises, mount } from '@vue/test-utils'
+import { describe, expect, it } from 'vitest'
+
+import { WaveformChart } from '../components'
+import { routes } from '../router'
+import FixedYDomainDemo from './FixedYDomainDemo.vue'
+
+describe('fixed Y-domain demo route', () => {
+  it('registers the example route', () => {
+    expect(routes).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          path: '/fixed-y-domain',
+          name: 'fixed-y-domain',
+        }),
+      ]),
+    )
+  })
+
+  it('switches between global, automatic, and per-channel ranges', async () => {
+    const wrapper = mount(FixedYDomainDemo)
+    await flushPromises()
+    const chart = () => wrapper.getComponent(WaveformChart)
+    const modeInputs = wrapper.get('[aria-label="Y 轴范围模式"]').findAll('input[type="radio"]')
+
+    expect(chart().props('yDomain')).toEqual([-80, 80])
+    expect(chart().props('yDomains')).toBeUndefined()
+
+    await modeInputs[0]?.setValue(true)
+    await flushPromises()
+    expect(chart().props('yDomain')).toBeUndefined()
+    expect(chart().props('yDomains')).toBeUndefined()
+
+    await modeInputs[2]?.setValue(true)
+    await flushPromises()
+    expect(chart().props('yDomain')).toBeUndefined()
+    expect(chart().props('yDomains')).toEqual({
+      voltage: [-65, 65],
+      current: [-260, 260],
+    })
+
+    wrapper.unmount()
+  })
+})
--- a/src/views/FixedYDomainDemo.vue
+++ b/src/views/FixedYDomainDemo.vue
@@ -0,0 +1,149 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { InputNumber, RadioButton, RadioGroup } from 'ant-design-vue'
+
+import { WaveformChart, type WaveformData } from '../components'
+
+type RangeMode = 'auto' | 'global' | 'channel'
+
+const rangeMode = ref<RangeMode>('global')
+const globalMinimum = ref(-80)
+const globalMaximum = ref(80)
+const voltageMinimum = ref(-65)
+const voltageMaximum = ref(65)
+const currentMinimum = ref(-260)
+const currentMaximum = ref(260)
+
+const chartData: WaveformData = {
+  kind: 'series',
+  series: [
+    {
+      id: 'voltage',
+      name: '电压',
+      unit: 'V',
+      color: '#1677ff',
+      data: {
+        kind: 'points',
+        points: Array.from({ length: 800 }, (_, index) => {
+          const x = index / 80
+          const pulse = index % 240 >= 112 && index % 240 <= 122 ? 58 : 0
+          return { x, y: 48 * Math.sin(x * Math.PI * 1.5) + pulse }
+        }),
+      },
+    },
+    {
+      id: 'current',
+      name: '电流',
+      unit: 'mA',
+      color: '#d4380d',
+      data: {
+        kind: 'points',
+        points: Array.from({ length: 800 }, (_, index) => {
+          const x = index / 80
+          const pulse = index % 300 >= 184 && index % 300 <= 192 ? -210 : 0
+          return { x, y: 185 * Math.cos(x * Math.PI) + pulse }
+        }),
+      },
+    },
+  ],
+}
+
+function orderedDomain(minimum: number, maximum: number): [number, number] | undefined {
+  if (!Number.isFinite(minimum) || !Number.isFinite(maximum) || minimum === maximum) {
+    return undefined
+  }
+  return minimum < maximum ? [minimum, maximum] : [maximum, minimum]
+}
+
+const yDomain = computed<[number, number] | undefined>(() =>
+  rangeMode.value === 'global'
+    ? orderedDomain(globalMinimum.value, globalMaximum.value)
+    : undefined,
+)
+const yDomains = computed<Record<string, [number, number]> | undefined>(() => {
+  if (rangeMode.value !== 'channel') return undefined
+  const voltage = orderedDomain(voltageMinimum.value, voltageMaximum.value)
+  const current = orderedDomain(currentMinimum.value, currentMaximum.value)
+  return {
+    ...(voltage ? { voltage } : {}),
+    ...(current ? { current } : {}),
+  }
+})
+const rangeSummary = computed(() => {
+  if (rangeMode.value === 'auto') return '自动计算'
+  if (rangeMode.value === 'global') {
+    return yDomain.value ? `${yDomain.value[0]} ～ ${yDomain.value[1]}` : '自动计算'
+  }
+  const voltage = yDomains.value?.voltage
+  const current = yDomains.value?.current
+  return `电压 ${voltage?.[0] ?? '-'} ～ ${voltage?.[1] ?? '-'} V · 电流 ${
+    current?.[0] ?? '-'
+  } ～ ${current?.[1] ?? '-'} mA`
+})
+</script>
+
+<template>
+  <main class="fixed-domain-demo">
+    <header class="fixed-domain-demo__toolbar">
+      <div>
+        <h1>固定振幅范围</h1>
+        <p>当前范围：{{ rangeSummary }}</p>
+      </div>
+      <RadioGroup v-model:value="rangeMode" button-style="solid" aria-label="Y 轴范围模式">
+        <RadioButton value="auto">自动</RadioButton>
+        <RadioButton value="global">全局固定</RadioButton>
+        <RadioButton value="channel">按通道固定</RadioButton>
+      </RadioGroup>
+    </header>
+
+    <section class="fixed-domain-demo__range-controls">
+      <template v-if="rangeMode === 'global'">
+        <label>
+          <span>下限</span>
+          <InputNumber v-model:value="globalMinimum" aria-label="全局振幅下限" />
+        </label>
+        <label>
+          <span>上限</span>
+          <InputNumber v-model:value="globalMaximum" aria-label="全局振幅上限" />
+        </label>
+      </template>
+      <template v-else-if="rangeMode === 'channel'">
+        <strong>电压</strong>
+        <label>
+          <span>下限</span>
+          <InputNumber v-model:value="voltageMinimum" aria-label="电压振幅下限" />
+        </label>
+        <label>
+          <span>上限</span>
+          <InputNumber v-model:value="voltageMaximum" aria-label="电压振幅上限" />
+        </label>
+        <strong>电流</strong>
+        <label>
+          <span>下限</span>
+          <InputNumber v-model:value="currentMinimum" aria-label="电流振幅下限" />
+        </label>
+        <label>
+          <span>上限</span>
+          <InputNumber v-model:value="currentMaximum" aria-label="电流振幅上限" />
+        </label>
+      </template>
+      <span v-else class="fixed-domain-demo__auto-state">根据可见数据自动计算</span>
+    </section>
+
+    <section class="fixed-domain-demo__chart">
+      <WaveformChart
+        :data="chartData"
+        :y-domain="yDomain"
+        :y-domains="yDomains"
+        display-mode="independent"
+        :grid="{ rowCount: 2, columnCount: 1, showPagination: false }"
+        :title="{ visible: true, text: '振幅上下限示例', align: 'left' }"
+        :zero-line="{ visible: true, color: '#98a2b3', width: 1, dash: '5 4' }"
+        :legend="{ position: 'top-right', backgroundColor: 'rgba(255,255,255,0.8)' }"
+        x-label="时间（s）"
+        time-unit="s"
+        :show-tooltip="true"
+      />
+    </section>
+  </main>
+</template>
Author	SHA1	Message	Date
李启源	979b698156	fix(chart): retain axes in clean view All checks were successful Package component / package (push) Successful in 3m58s Details	2026-07-31 10:27:27 +08:00
李启源	a12002ba11	feat(chart): support fixed y-axis domains All checks were successful Package component / package (push) Successful in 9m22s Details	2026-07-29 15:50:25 +08:00