优化代码结构

src/App.vue

@@ -3,6 +3,7 @@ import { ref, computed, reactive, onMounted, onBeforeUnmount, watch } from 'vue'
 import DeterminationMachine from './components/DeterminationMachine.vue';
 //@ts-ignore
 import SilverKnob from './components/SilverKnob.vue';
+import DraggableInstrumentWrapper from './components/DraggableInstrumentWrapper.vue';
 import Oscilloscope from './components/Oscilloscope.vue';
 import SignalGen from './components/SignalGen.vue';
 import Notebook from './components/Notebook.vue';
@@ -336,6 +337,23 @@ const wiringConnected = reactive<Record<WireKey, boolean>>({
   rxTransducer_to_right: false,
 });
 
+// =========================
+// 示波器信号有效性（由接线决定）
+// =========================
+
+// CH1：仅当 [信号发生器 发射端 波形] -> [示波器 CH1] 接入时才有波形
+const oscCh1HasSignal = computed(() => wiringConnected.txWave_to_ch1);
+
+// CH2：仅当这三条线都接入时才有波形
+// [信号发生器 发射端 换能器] -> [换能器 左侧输入]
+// [信号发生器 接收端 波形] -> [示波器 CH2]
+// [信号发生器 接收端 换能器] -> [换能器 右侧输出]
+const oscCh2HasSignal = computed(() =>
+  wiringConnected.txTransducer_to_left
+  && wiringConnected.rxWave_to_ch2
+  && wiringConnected.rxTransducer_to_right
+);
+
 // =========================
 // 步骤标题（document.title）
 // =========================
@@ -389,6 +407,17 @@ const tooltip = reactive({
   side: 'right' as TooltipSide,
 });
 
+// 接线错误：短暂提示（不打断交互）
+const wiringErrorToast = reactive({
+  visible: false,
+  text: '',
+  x: 0,
+  y: 0,
+  side: 'right' as TooltipSide,
+});
+
+let wiringErrorToastTimer: number | null = null;
+
 const tooltipTargetEl = ref<HTMLElement | null>(null);
 
 const hideTooltip = () => {
@@ -396,7 +425,7 @@ const hideTooltip = () => {
   tooltipTargetEl.value = null;
 };
 
-const updateTooltipPosition = (el: HTMLElement) => {
+const calcBubblePosition = (el: HTMLElement) => {
   const table = tableRef.value;
   if (!table) return;
 
@@ -412,11 +441,21 @@ const updateTooltipPosition = (el: HTMLElement) => {
   const leftX = r.left - tableRect.left - margin;
 
   const hasRoomOnRight = rightX + approxBubbleW <= tableRect.width;
-  tooltip.side = hasRoomOnRight ? 'right' : 'left';
+  const side = hasRoomOnRight ? 'right' : 'left';
-  tooltip.x = hasRoomOnRight ? rightX : leftX;
+  const x = hasRoomOnRight ? rightX : leftX;
 
   // y 以上方为主，避免贴边
-  tooltip.y = Math.max(10, Math.min(tableRect.height - 10, anchorY));
+  const y = Math.max(10, Math.min(tableRect.height - 10, anchorY));
+
+  return { x, y, side } as const;
+};
+
+const updateTooltipPosition = (el: HTMLElement) => {
+  const pos = calcBubblePosition(el);
+  if (!pos) return;
+  tooltip.side = pos.side;
+  tooltip.x = pos.x;
+  tooltip.y = pos.y;
 };
 
 const showTooltipForEl = (el: HTMLElement) => {
@@ -430,6 +469,27 @@ const showTooltipForEl = (el: HTMLElement) => {
   updateTooltipPosition(el);
 };
 
+const showWiringErrorToast = (text: string, anchorEl?: HTMLElement) => {
+  const el = anchorEl ?? null;
+  if (el) {
+    const pos = calcBubblePosition(el);
+    if (pos) {
+      wiringErrorToast.side = pos.side;
+      wiringErrorToast.x = pos.x;
+      wiringErrorToast.y = pos.y;
+    }
+  }
+
+  wiringErrorToast.text = text;
+  wiringErrorToast.visible = true;
+
+  if (wiringErrorToastTimer !== null) window.clearTimeout(wiringErrorToastTimer);
+  wiringErrorToastTimer = window.setTimeout(() => {
+    wiringErrorToastTimer = null;
+    wiringErrorToast.visible = false;
+  }, 1600);
+};
+
 const findTooltipEl = (target: EventTarget | null): HTMLElement | null => {
   if (!target) return null;
   const t = target as HTMLElement;
@@ -473,6 +533,15 @@ const tooltipStyle = computed(() => {
   return base;
 });
 
+const wiringErrorToastStyle = computed(() => {
+  const base: Record<string, string> = {
+    left: `${wiringErrorToast.x}px`,
+    top: `${wiringErrorToast.y}px`,
+  };
+  base.transform = wiringErrorToast.side === 'right' ? 'translate(0, -50%)' : 'translate(-100%, -50%)';
+  return base;
+});
+
 const pinEls = new Map<PinId, HTMLElement>();
 const selectedPin = ref<PinId | null>(null);
 
@@ -584,13 +653,16 @@ const addCableIfNeeded = (key: WireKey, a: PinId, b: PinId) => {
   scheduleUpdateCablePaths();
 };
 
-const alertWiringError = () => {
+const alertWiringError = (anchorEl?: HTMLElement) => {
-  window.alert('接线错误：请按接线示意连接对应端口。');
+  showWiringErrorToast('接线错误：请按接线示意连接对应端口。', anchorEl);
 };
 
 const onPinClick = (id: PinId) => {
   ea.play('线缆插入')
 
+  // 有任何点击就把“错误提示”收起，避免遮挡
+  if (wiringErrorToast.visible) wiringErrorToast.visible = false;
+
   postTracker('pin_click', { pinId: id, hasSelected: selectedPin.value !== null });
 
   if (selectedPin.value === null) {
@@ -608,7 +680,7 @@ const onPinClick = (id: PinId) => {
   const key = requiredByPair.get(normalizePair(first, id));
   if (!key) {
     postTracker('wire_error', { a: first, b: id });
-    alertWiringError();
+    alertWiringError(pinEls.get(id) ?? pinEls.get(first));
     return;
   }
 
@@ -677,6 +749,7 @@ onBeforeUnmount(() => {
   if (cablesRaf !== null) cancelAnimationFrame(cablesRaf);
   window.removeEventListener('resize', scheduleUpdateCablePaths);
   if (dmRightCableTimer !== null) window.clearTimeout(dmRightCableTimer);
+  if (wiringErrorToastTimer !== null) window.clearTimeout(wiringErrorToastTimer);
 });
 
 </script>
@@ -695,6 +768,11 @@ onBeforeUnmount(() => {
       <div class="tooltip-inner">{{ tooltip.text }}</div>
     </div>
 
+    <div v-if="wiringErrorToast.visible" class="tooltip" :class="`tooltip--${wiringErrorToast.side}`"
+      :style="wiringErrorToastStyle">
+      <div class="tooltip-inner">{{ wiringErrorToast.text }}</div>
+    </div>
+
     <svg class="cables" :width="1600" :height="900" viewBox="0 0 1600 900"
       aria-hidden="true">
       <defs>
@@ -711,91 +789,29 @@ onBeforeUnmount(() => {
       </g>
     </svg>
 
-    <div class="instrument-wrapper" :style="machineStyle">
+    <DraggableInstrumentWrapper :style="machineStyle" :instrument="machine" @start-drag="startDrag">
-      <div class="drag-handle" data-tooltip="拖动把手可移动仪器位置" @pointerdown="startDrag(machine, $event)">
-        <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24"
-          viewBox="0 0 24 24" fill="none" stroke="currentColor"
-          stroke-width="2">
-          <circle cx="12" cy="5" r="1" />
-          <circle cx="12" cy="12" r="1" />
-          <circle cx="12" cy="19" r="1" />
-          <circle cx="8" cy="5" r="1" />
-          <circle cx="8" cy="12" r="1" />
-          <circle cx="8" cy="19" r="1" />
-          <circle cx="16" cy="5" r="1" />
-          <circle cx="16" cy="12" r="1" />
-          <circle cx="16" cy="19" r="1" />
-        </svg>
-      </div>
       <DeterminationMachine v-model="distance" class="machine"
-        @register-pin="registerPin" @unregister-pin="unregisterPin"
+        @register-pin="registerPin" @unregister-pin="unregisterPin" @pin-click="onPinClick"
-        @pin-click="onPinClick" @change="onDistanceChange" />
+        @change="onDistanceChange" />
-    </div>
+    </DraggableInstrumentWrapper>
 
-    <div class="instrument-wrapper" :style="notebookStyle">
+    <DraggableInstrumentWrapper :style="notebookStyle" :instrument="notebook" @start-drag="startDrag">
-      <div class="drag-handle" data-tooltip="拖动把手可移动仪器位置" @pointerdown="startDrag(notebook, $event)">
-        <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24"
-          viewBox="0 0 24 24" fill="none" stroke="currentColor"
-          stroke-width="2">
-          <circle cx="12" cy="5" r="1" />
-          <circle cx="12" cy="12" r="1" />
-          <circle cx="12" cy="19" r="1" />
-          <circle cx="8" cy="5" r="1" />
-          <circle cx="8" cy="12" r="1" />
-          <circle cx="8" cy="19" r="1" />
-          <circle cx="16" cy="5" r="1" />
-          <circle cx="16" cy="12" r="1" />
-          <circle cx="16" cy="19" r="1" />
-        </svg>
-      </div>
       <Notebook class="machine" :wiring="wiringConnected"
         :osc="{ vdch1: oscStatus.vdch1, vdch2: oscStatus.vdch2, currentModeIndex: oscStatus.currentModeIndex, xyMode: oscStatus.xyMode, power: oscStatus.power }"
-        :signal-frequency-k-hz="signalFrequencyKHz"
+        :signal-frequency-k-hz="signalFrequencyKHz" :lissajous-line-streak="lissajousLineStreak" />
-        :lissajous-line-streak="lissajousLineStreak" />
+    </DraggableInstrumentWrapper>
-    </div>
 
-    <div class="instrument-wrapper" :style="oscilloscopeStyle">
+    <DraggableInstrumentWrapper :style="oscilloscopeStyle" :instrument="oscilloscope" @start-drag="startDrag">
-      <div class="drag-handle" data-tooltip="拖动把手可移动仪器位置" @pointerdown="startDrag(oscilloscope, $event)">
+      <Oscilloscope :distance="distance" :frequency="signalFrequencyKHz * 1000" :ch1-has-signal="oscCh1HasSignal"
-        <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24"
+        :ch2-has-signal="oscCh2HasSignal" class="machine" @register-pin="registerPin"
-          viewBox="0 0 24 24" fill="none" stroke="currentColor"
+        @unregister-pin="unregisterPin" @pin-click="onPinClick" @settings="onOscSettings"
-          stroke-width="2">
+        @lissajous-line="onLissajousLine" />
-          <circle cx="12" cy="5" r="1" />
+    </DraggableInstrumentWrapper>
-          <circle cx="12" cy="12" r="1" />
-          <circle cx="12" cy="19" r="1" />
-          <circle cx="8" cy="5" r="1" />
-          <circle cx="8" cy="12" r="1" />
-          <circle cx="8" cy="19" r="1" />
-          <circle cx="16" cy="5" r="1" />
-          <circle cx="16" cy="12" r="1" />
-          <circle cx="16" cy="19" r="1" />
-        </svg>
-      </div>
-      <Oscilloscope :distance="distance" :frequency="signalFrequencyKHz * 1000"
-        class="machine" @register-pin="registerPin"
-        @unregister-pin="unregisterPin" @pin-click="onPinClick"
-        @settings="onOscSettings" @lissajous-line="onLissajousLine" />
-    </div>
 
-    <div class="instrument-wrapper" :style="signalGenStyle">
+    <DraggableInstrumentWrapper :style="signalGenStyle" :instrument="signalGen" @start-drag="startDrag">
-      <div class="drag-handle" data-tooltip="拖动把手可移动仪器位置" @pointerdown="startDrag(signalGen, $event)">
+      <SignalGen v-model="signalFrequencyKHz" class="machine" @register-pin="registerPin"
-        <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24"
+        @unregister-pin="unregisterPin" @pin-click="onPinClick" />
-          viewBox="0 0 24 24" fill="none" stroke="currentColor"
+    </DraggableInstrumentWrapper>
-          stroke-width="2">
-          <circle cx="12" cy="5" r="1" />
-          <circle cx="12" cy="12" r="1" />
-          <circle cx="12" cy="19" r="1" />
-          <circle cx="8" cy="5" r="1" />
-          <circle cx="8" cy="12" r="1" />
-          <circle cx="8" cy="19" r="1" />
-          <circle cx="16" cy="5" r="1" />
-          <circle cx="16" cy="12" r="1" />
-          <circle cx="16" cy="19" r="1" />
-        </svg>
-      </div>
-      <SignalGen v-model="signalFrequencyKHz" class="machine"
-        @register-pin="registerPin" @unregister-pin="unregisterPin"
-        @pin-click="onPinClick" />
-    </div>
   </div>
 </template>
 
@@ -863,62 +879,10 @@ onBeforeUnmount(() => {
   stroke-linejoin: round;
 }
 
-.instrument-wrapper {
-  position: absolute;
-  filter: drop-shadow(0 10px 10px black);
-  transition: filter 0.2s;
-}
-
 .machine {
   pointer-events: auto;
 }
 
-.drag-handle {
-  touch-action: none;
-  position: absolute;
-  top: -12px;
-  left: 50%;
-  transform: translateX(-50%);
-  width: 40px;
-  height: 24px;
-  background: linear-gradient(135deg, rgba(100, 100, 100, 0.9), rgba(60, 60, 60, 0.95));
-  border-radius: 12px;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  cursor: grab;
-  z-index: 1000;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 2px rgba(255, 255, 255, 0.2);
-  opacity: 0.7;
-  transition: all 0.2s;
-  border: 1px solid rgba(255, 255, 255, 0.1);
-  backdrop-filter: blur(4px);
-}
-
-.drag-handle:hover {
-  opacity: 1;
-  background: linear-gradient(135deg, rgba(120, 120, 120, 0.95), rgba(80, 80, 80, 1));
-  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.5), inset 0 1px 2px rgba(255, 255, 255, 0.3);
-  transform: translateX(-50%) scale(1.1);
-}
-
-.drag-handle:active {
-  cursor: grabbing;
-  background: linear-gradient(135deg, rgba(80, 80, 80, 1), rgba(50, 50, 50, 1));
-  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6), inset 0 1px 2px rgba(255, 255, 255, 0.2);
-}
-
-.drag-handle svg {
-  width: 20px;
-  height: 20px;
-  color: rgba(255, 255, 255, 0.8);
-  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.5));
-}
-
-.instrument-wrapper:hover .drag-handle {
-  opacity: 0.9;
-}
-
 .tooltip {
   position: absolute;
   z-index: 9000;

src/components/DraggableInstrumentWrapper.vue

@@ -0,0 +1,104 @@
+<script setup lang="ts">
+import type { PropType } from 'vue';
+
+interface InstrumentState {
+  left: number;
+  bottom: number;
+  baseScale: number;
+  zIndex: number;
+}
+
+const props = defineProps({
+  instrument: {
+    type: Object as PropType<InstrumentState>,
+    required: true,
+  },
+  tooltip: {
+    type: String,
+    default: '拖动把手可移动仪器位置',
+  },
+});
+
+const emit = defineEmits<{
+  (e: 'start-drag', instrument: InstrumentState, ev: PointerEvent): void;
+}>();
+
+const onPointerDown = (ev: PointerEvent) => {
+  emit('start-drag', props.instrument, ev);
+};
+</script>
+
+<template>
+  <div class="instrument-wrapper">
+    <div class="drag-handle" :data-tooltip="tooltip" @pointerdown="onPointerDown">
+      <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none"
+        stroke="currentColor" stroke-width="2">
+        <circle cx="12" cy="5" r="1" />
+        <circle cx="12" cy="12" r="1" />
+        <circle cx="12" cy="19" r="1" />
+        <circle cx="8" cy="5" r="1" />
+        <circle cx="8" cy="12" r="1" />
+        <circle cx="8" cy="19" r="1" />
+        <circle cx="16" cy="5" r="1" />
+        <circle cx="16" cy="12" r="1" />
+        <circle cx="16" cy="19" r="1" />
+      </svg>
+    </div>
+
+    <slot />
+  </div>
+</template>
+
+<style scoped>
+.instrument-wrapper {
+  position: absolute;
+  filter: drop-shadow(0 10px 10px black);
+  transition: filter 0.2s;
+}
+
+.drag-handle {
+  touch-action: none;
+  position: absolute;
+  top: -12px;
+  left: 50%;
+  transform: translateX(-50%);
+  width: 40px;
+  height: 24px;
+  background: linear-gradient(135deg, rgba(100, 100, 100, 0.9), rgba(60, 60, 60, 0.95));
+  border-radius: 12px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: grab;
+  z-index: 1000;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 2px rgba(255, 255, 255, 0.2);
+  opacity: 0.7;
+  transition: all 0.2s;
+  border: 1px solid rgba(255, 255, 255, 0.1);
+  backdrop-filter: blur(4px);
+}
+
+.drag-handle:hover {
+  opacity: 1;
+  background: linear-gradient(135deg, rgba(120, 120, 120, 0.95), rgba(80, 80, 80, 1));
+  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.5), inset 0 1px 2px rgba(255, 255, 255, 0.3);
+  transform: translateX(-50%) scale(1.1);
+}
+
+.drag-handle:active {
+  cursor: grabbing;
+  background: linear-gradient(135deg, rgba(80, 80, 80, 1), rgba(50, 50, 50, 1));
+  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6), inset 0 1px 2px rgba(255, 255, 255, 0.2);
+}
+
+.drag-handle svg {
+  width: 20px;
+  height: 20px;
+  color: rgba(255, 255, 255, 0.8);
+  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.5));
+}
+
+.instrument-wrapper:hover .drag-handle {
+  opacity: 0.9;
+}
+</style>

src/components/Oscilloscope.vue

@@ -31,6 +31,15 @@ const props = defineProps({
     // 声速，单位m/s
     soundSpeed: { type: Number, default: 340 },
 
+    // 接线状态：控制通道是否真正有信号
+    // CH1：仅当 [信号发生器 发射端 波形] -> [示波器 CH1] 接入时为 true
+    ch1HasSignal: { type: Boolean, default: false },
+    // CH2：仅当三条线都接入时为 true
+    // [信号发生器 发射端 换能器] -> [换能器 左侧输入]
+    // [信号发生器 接收端 波形] -> [示波器 CH2]
+    // [信号发生器 接收端 换能器] -> [换能器 右侧输出]
+    ch2HasSignal: { type: Boolean, default: false },
+
 });
 
 const emit = defineEmits<{
@@ -147,8 +156,8 @@ function drawOscilloscope() {
     const gainCH1 = getGain(vdch1.value);
     const gainCH2 = getGain(vdch2.value);
 
-    // X-Y 模式下检测“李萨如图形出现直线”的进入事件
+    // X-Y 模式下检测“李萨如图形出现直线”的进入事件（需两路都有信号）
-    if (power.value && isXYMode.value) {
+    if (power.value && isXYMode.value && props.ch1HasSignal && props.ch2HasSignal) {
         const phase = phy.phaseRadTotal;
         const isLineNow = Math.abs(Math.sin(phase)) < 0.10 && phy.resonanceFactor > 0.05;
         if (isLineNow && !lastWasLine.value) {
@@ -171,7 +180,8 @@ function drawOscilloscope() {
 
     if (isXYMode.value) {
         // ================= X-Y Mode (李萨如图形) =================
-        const opacity = 0.3 + 0.7 * phy.resonanceFactor;
+        const hasAnySignal = props.ch1HasSignal || props.ch2HasSignal;
+        const opacity = hasAnySignal ? (0.3 + 0.7 * phy.resonanceFactor) : 0.15;
         ctx.strokeStyle = `rgba(0, 255, 0, ${opacity})`;
 
         // 强辉光效果 - 多层叠加
@@ -180,8 +190,8 @@ function drawOscilloscope() {
 
         ctx.beginPath();
         const phase = phy.phaseRadTotal;
-        const ampX = gainCH1;
+        const ampX = props.ch1HasSignal ? gainCH1 : 0;
-        const ampY = phy.resonanceFactor * gainCH2;
+        const ampY = props.ch2HasSignal ? (phy.resonanceFactor * gainCH2) : 0;
 
         for (let t = 0; t <= 2 * Math.PI; t += 0.03) {
             const x = scale * ampX * Math.cos(t);
@@ -197,6 +207,12 @@ function drawOscilloscope() {
 
         ctx.shadowBlur = 0;
 
+        // 两路都没信号时，画一个中心点（避免完全不可见）
+        if (!props.ch1HasSignal && !props.ch2HasSignal) {
+            ctx.fillStyle = 'rgba(0, 255, 0, 0.25)';
+            ctx.fillRect(cx - 1.5, cy - 1.5, 3, 3);
+        }
+
         // 中心点装饰
         ctx.fillStyle = 'rgba(0, 255, 0, 0.3)';
         ctx.fillRect(cx - 1, cy - 5, 2, 10);
@@ -218,18 +234,52 @@ function drawOscilloscope() {
 
         ctx.lineWidth = 3;
 
-        // CH1 (Source) - 黄色参考信号（在CH1、双踪、叠加模式下显示）
+        // 叠加模式：直接绘制 CH1 + CH2 的合成波形（形状更复杂）
-        if (currentModeIndex.value === 0 || currentModeIndex.value === 2 || currentModeIndex.value === 3) {
+        if (currentModeIndex.value === 3) {
+            const opacity = 0.45 + 0.55 * phy.resonanceFactor;
+            ctx.beginPath();
+            // 用 CH1 的黄色线条 + CH2 的绿色辉光，便于与单通道/双踪区分
+            ctx.strokeStyle = `rgba(255, 230, 0, ${opacity})`;
+            ctx.shadowBlur = 14 * (0.4 + 0.6 * phy.resonanceFactor);
+            ctx.shadowColor = '#00ff00';
+
+            const phaseShift = phy.phaseRadTotal;
+            const amp1 = gainCH1 * 0.8;
+            const amp2 = phy.resonanceFactor * gainCH2 * 0.8;
+
+            for (let x = 0; x < w; x += 2) {
+                const t = (x / pixPerCycle) * 2 * Math.PI;
+                const y1 = props.ch1HasSignal ? (amp1 * Math.sin(t + time)) : 0;
+                const y2 = props.ch2HasSignal ? (amp2 * Math.sin(t - phaseShift + time)) : 0;
+                const yVal = scale * (y1 + y2);
+                if (x === 0) ctx.moveTo(x, cy - yVal);
+                else ctx.lineTo(x, cy - yVal);
+            }
+            ctx.stroke();
+
+            // 第二层辉光
+            ctx.shadowBlur = 22 * (0.4 + 0.6 * phy.resonanceFactor);
+            ctx.stroke();
+        }
+
+        // CH1 (Source) - 黄色参考信号（在CH1、双踪模式下显示）
+        if (currentModeIndex.value === 0 || currentModeIndex.value === 2) {
             ctx.beginPath();
             ctx.strokeStyle = 'rgba(255, 230, 0, 0.9)';
             ctx.shadowBlur = 12;
             ctx.shadowColor = '#ffff00';
 
-            for (let x = 0; x < w; x += 2) {
+            if (props.ch1HasSignal) {
-                const t = (x / pixPerCycle) * 2 * Math.PI;
+                for (let x = 0; x < w; x += 2) {
-                const yVal = scale * gainCH1 * 0.8 * Math.sin(t + time);
+                    const t = (x / pixPerCycle) * 2 * Math.PI;
-                if (x === 0) ctx.moveTo(x, cy - yVal);
+                    const yVal = scale * gainCH1 * 0.8 * Math.sin(t + time);
-                else ctx.lineTo(x, cy - yVal);
+                    if (x === 0) ctx.moveTo(x, cy - yVal);
+                    else ctx.lineTo(x, cy - yVal);
+                }
+            } else {
+                // 未接线：显示中心直线
+                ctx.moveTo(0, cy);
+                ctx.lineTo(w, cy);
             }
             ctx.stroke();
 
@@ -238,8 +288,8 @@ function drawOscilloscope() {
             ctx.stroke();
         }
 
-        // CH2 (Receiver) - 绿色接收信号（在CH2、双踪、叠加模式下显示）
+        // CH2 (Receiver) - 绿色接收信号（在CH2、双踪模式下显示）
-        if (currentModeIndex.value === 1 || currentModeIndex.value === 2 || currentModeIndex.value === 3) {
+        if (currentModeIndex.value === 1 || currentModeIndex.value === 2) {
             const opacity = 0.3 + 0.7 * phy.resonanceFactor;
             ctx.beginPath();
             ctx.strokeStyle = `rgba(0, 255, 0, ${opacity})`;
@@ -249,11 +299,18 @@ function drawOscilloscope() {
             const phaseShift = phy.phaseRadTotal;
             const ampY = phy.resonanceFactor * gainCH2 * 0.8;
 
-            for (let x = 0; x < w; x += 2) {
+            if (props.ch2HasSignal) {
-                const t = (x / pixPerCycle) * 2 * Math.PI;
+                for (let x = 0; x < w; x += 2) {
-                const yVal = scale * ampY * Math.sin(t - phaseShift + time);
+                    const t = (x / pixPerCycle) * 2 * Math.PI;
-                if (x === 0) ctx.moveTo(x, cy - yVal);
+                    const yVal = scale * ampY * Math.sin(t - phaseShift + time);
-                else ctx.lineTo(x, cy - yVal);
+                    if (x === 0) ctx.moveTo(x, cy - yVal);
+                    else ctx.lineTo(x, cy - yVal);
+                }
+            } else {
+                // 未接线：显示中心直线
+                ctx.shadowBlur = 0;
+                ctx.moveTo(0, cy);
+                ctx.lineTo(w, cy);
             }
             ctx.stroke();
 

接线示意.md

@@ -0,0 +1,8 @@
+src\components\DeterminationMachine.vue -> 换能器
+src\components\Oscilloscope.vue -> 示波器
+src\components\SignalGen.vue -> 信号发生器
+
+[信号发生器的 发射端 波形] 接 [示波器的 CH1 输入]
+[信号发生器的 发射端 换能器] 接 [换能器 左侧输入]
+[信号发生器的 接收端 波形] 接 [示波器的 CH2 输入]
+[信号发生器的 接收端 换能器] 接 [换能器 右侧输出]