feat(chart): support fixed y-axis domains

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>