feat: 添加手势缩放功能至MarkingImageViewerNew组件

src/components/marking/components/renderer/MarkingImageViewerNew.vue

@@ -3,7 +3,6 @@ import type { KonvaMarkingData } from '../../composables/renderer/useMarkingKonv
 import type { ExamStudentMarkingQuestionResponse } from '@/api'
 import { markingSettings } from '../../composables/useMarkingSettings'
 import { useSmartScale } from '../../composables/useSmartScale'
-import ScaleControlPanel from '../ScaleControlPanel.vue'
 import QuestionRenderer from './QuestionRenderer.vue'
 
 interface Props {
@@ -21,6 +20,62 @@ const smartScale = useSmartScale(props.imageSize)
 
 const questionData = defineModel<ExamStudentMarkingQuestionResponse[]>('questionData')
 
+// 手势缩放相关
+const containerRef = ref<HTMLElement>()
+const initialDistance = ref(0)
+const initialScale = ref(1)
+const isGesturing = ref(false)
+
+/**
+ * 计算两点之间的距离
+ */
+function getDistance(touch1: Touch, touch2: Touch): number {
+  const dx = touch2.clientX - touch1.clientX
+  const dy = touch2.clientY - touch1.clientY
+  return Math.sqrt(dx * dx + dy * dy)
+}
+
+/**
+ * 处理触摸开始
+ */
+function handleTouchStart(e: TouchEvent) {
+  if (e.touches.length === 2) {
+    // 双指触摸，开始缩放手势
+    isGesturing.value = true
+    initialDistance.value = getDistance(e.touches[0], e.touches[1])
+    initialScale.value = smartScale.userScaleFactor.value
+    e.preventDefault()
+  }
+}
+
+/**
+ * 处理触摸移动
+ */
+function handleTouchMove(e: TouchEvent) {
+  if (e.touches.length === 2 && isGesturing.value) {
+    // 计算新的距离
+    const currentDistance = getDistance(e.touches[0], e.touches[1])
+
+    // 计算缩放比例变化
+    const scaleChange = currentDistance / initialDistance.value
+
+    // 应用新的缩放比例
+    const newScale = initialScale.value * scaleChange
+    smartScale.setScale(newScale)
+
+    e.preventDefault()
+  }
+}
+
+/**
+ * 处理触摸结束
+ */
+function handleTouchEnd(e: TouchEvent) {
+  if (e.touches.length < 2) {
+    isGesturing.value = false
+  }
+}
+
 // 计算题目布局类
 const questionsLayoutClass = computed(() => ({
   'questions-vertical': true, // 多题总是竖排
@@ -51,17 +106,20 @@ function handleMarkingChange(questionIndex: number, imageIndex: number, data: Ko
 </script>
 
 <template>
-  <div class="multi-question-renderer">
-    <!-- 缩放控制面板 -->
-    <ScaleControlPanel
-      :scale-text="smartScale.scaleText.value"
-      :can-zoom-in="smartScale.canZoomIn.value"
-      :can-zoom-out="smartScale.canZoomOut.value"
-      @zoom-in="smartScale.zoomIn"
-      @zoom-out="smartScale.zoomOut"
-      @reset-zoom="smartScale.resetZoom"
-      @fit-to-screen="smartScale.fitToScreen"
-    />
+  <div
+    ref="containerRef"
+    class="multi-question-renderer"
+    @touchstart="handleTouchStart"
+    @touchmove="handleTouchMove"
+    @touchend="handleTouchEnd"
+  >
+    <!-- 缩放提示 -->
+    <div
+      v-if="isGesturing"
+      class="fixed left-1/2 top-1/2 z-50 rounded-lg bg-black/70 px-4 py-2 text-white -translate-x-1/2 -translate-y-1/2"
+    >
+      {{ smartScale.scaleText.value }}
+    </div>
 
     <div class="flex flex-col flex-nowrap" :class="questionsLayoutClass">
       <QuestionRenderer
@@ -85,6 +143,7 @@ function handleMarkingChange(questionIndex: number, imageIndex: number, data: Ko
   overflow: auto;
   padding: 8rpx 16rpx;
   padding-bottom: 96rpx;
+  touch-action: pan-x pan-y;
 }
 
 .questions-container {

src/components/marking/composables/useSmartScale.ts

@@ -1,50 +1,36 @@
-import { ref, computed, watch } from 'vue'
-import { useScreenWidth } from './useScreenWidth'
+import { computed, ref } from 'vue'
 
 /**
- * 智能缩放控制
+ * 智能缩放控制 - 支持手势缩放
  */
 export function useSmartScale(imageSize: number = 100) {
-  const { screenWidth } = useScreenWidth()
-  
-  // 基础缩放比例
-  const baseScale = computed(() => imageSize / 100)
-  
-  // 用户手动调节的缩放因子（1.0 = 默认，0.5 = 缩小50%，1.5 = 放大50%）
+  // 用户手动调节的缩放因子（1.0 = 默认100%，0.5 = 缩小50%，2.0 = 放大200%）
   const userScaleFactor = ref(1.0)
 
-  // 自动适应屏幕的缩放因子
-  const autoScaleFactor = computed(() => {
-    // 当屏幕宽度小于600px时，适当缩小以适应屏幕
-    if (screenWidth.value < 600) {
-      return Math.max(0.6, screenWidth.value / 1000) // 最小0.6倍
-    }
-    return 1.0
-  })
-  
-  // 最终的缩放比例
+  // 最终的缩放比例 - 默认100%
   const finalScale = computed(() => {
-    return baseScale.value * userScaleFactor.value * autoScaleFactor.value
+    return userScaleFactor.value
   })
 
-  // 缩放控制方法
+  // 设置缩放比例（用于手势缩放）
+  const setScale = (scale: number) => {
+    // 限制缩放范围：0.3倍到5倍
+    userScaleFactor.value = Math.max(0.3, Math.min(5.0, scale))
+  }
+
+  // 缩放控制方法（保留用于可能的按钮控制）
   const zoomIn = () => {
-    userScaleFactor.value = Math.min(userScaleFactor.value + 0.2, 3.0) // 最大3倍
+    userScaleFactor.value = Math.min(userScaleFactor.value + 0.2, 5.0)
   }
 
   const zoomOut = () => {
-    userScaleFactor.value = Math.max(userScaleFactor.value - 0.2, 0.3) // 最小0.3倍
+    userScaleFactor.value = Math.max(userScaleFactor.value - 0.2, 0.3)
   }
 
   const resetZoom = () => {
     userScaleFactor.value = 1.0
   }
 
-  // 自动适应屏幕
-  const fitToScreen = () => {
-    userScaleFactor.value = 1.0 / autoScaleFactor.value
-  }
-  
   // 缩放级别文本
   const scaleText = computed(() => {
     const percentage = Math.round(userScaleFactor.value * 100)
@@ -52,19 +38,18 @@ export function useSmartScale(imageSize: number = 100) {
   })
 
   // 是否可以放大/缩小
-  const canZoomIn = computed(() => userScaleFactor.value < 3.0)
+  const canZoomIn = computed(() => userScaleFactor.value < 5.0)
   const canZoomOut = computed(() => userScaleFactor.value > 0.3)
 
   return {
     finalScale,
     userScaleFactor,
-    autoScaleFactor,
     scaleText,
     canZoomIn,
     canZoomOut,
     zoomIn,
     zoomOut,
     resetZoom,
-    fitToScreen,
+    setScale,
   }
 }