From 4bd80124252d03e64b8dd304e99ff677b41fe68e Mon Sep 17 00:00:00 2001
From: pipipi-pikachu <pipipi_pikachu@163.com>
Date: Sat, 23 Apr 2022 14:27:08 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=94=BE=E6=98=A0=E6=A8=A1=E5=BC=8F?=
 =?UTF-8?q?=E7=94=BB=E6=9D=BF=E6=B7=BB=E5=8A=A0=E8=8D=A7=E5=85=89=E7=AC=94?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/components/WritingBoard.vue       | 77 +++++++++++++++++++--------
 src/plugins/icon.ts                   |  2 +
 src/views/Screen/WritingBoardTool.vue | 30 +++++------
 3 files changed, 70 insertions(+), 39 deletions(-)

diff --git a/src/components/WritingBoard.vue b/src/components/WritingBoard.vue
index 9fcb4758..eb7051d1 100644
--- a/src/components/WritingBoard.vue
+++ b/src/components/WritingBoard.vue
@@ -17,34 +17,49 @@
       @mouseenter="mouseInCanvas = true"
     ></canvas>
 
-    <div 
-      class="pen"
-      :style="{
-        left: mouse.x - penSize / 2 + 'px',
-        top: mouse.y - 36 + penSize / 2 + 'px',
-        color: color,
-      }"
-      v-if="mouseInCanvas && model === 'pen'"
-    ><IconWrite class="icon" size="36" /></div>
-    
-    <div 
-      class="eraser"
-      :style="{
-        left: mouse.x - rubberSize / 2 + 'px',
-        top: mouse.y - rubberSize / 2 + 'px',
-        width: rubberSize + 'px',
-        height: rubberSize + 'px',
-      }"
-      v-if="mouseInCanvas && model === 'eraser'"
-    ></div>
+    <template v-if="mouseInCanvas">
+      <div 
+        class="eraser"
+        :style="{
+          left: mouse.x - rubberSize / 2 + 'px',
+          top: mouse.y - rubberSize / 2 + 'px',
+          width: rubberSize + 'px',
+          height: rubberSize + 'px',
+        }"
+        v-if="model === 'eraser'"
+      ></div>
+      <div 
+        class="pen"
+        :style="{
+          left: mouse.x - penSize / 2 + 'px',
+          top: mouse.y - 36 + penSize / 2 + 'px',
+          color: color,
+        }"
+        v-if="model === 'pen'"
+      >
+        <IconWrite class="icon" size="36" v-if="model === 'pen'" />
+      </div>
+      <div 
+        class="pen"
+        :style="{
+          left: mouse.x - markSize / 2 + 'px',
+          top: mouse.y + 'px',
+          color: color,
+        }"
+        v-if="model === 'mark'"
+      >
+        <IconHighLight class="icon" size="36" v-if="model === 'mark'" />
+      </div>
+    </template>
   </div>
 </template>
 
 <script lang="ts">
-import { computed, defineComponent, onMounted, onUnmounted, PropType, ref } from 'vue'
+import { computed, defineComponent, onMounted, onUnmounted, PropType, ref, watch } from 'vue'
 
 const penSize = 6
 const rubberSize = 80
+const markSize = 25
 
 export default defineComponent({
   name: 'writing-board',
@@ -54,7 +69,7 @@ export default defineComponent({
       default: '#ffcc00',
     },
     model: {
-      type: String as PropType<'pen' | 'eraser'>,
+      type: String as PropType<'pen' | 'eraser' | 'mark'>,
       default: 'pen',
     },
     blackboard: {
@@ -119,6 +134,20 @@ export default defineComponent({
     }
     onMounted(initCanvas)
 
+    // 切换画笔模式时，更新 canvas ctx 配置
+    const updateCtx = () => {
+      if (!ctx) return
+      if (props.model === 'mark') {
+        ctx.globalCompositeOperation = 'xor'
+        ctx.globalAlpha = 0.5
+      }
+      else if (props.model === 'pen') {
+        ctx.globalCompositeOperation = 'source-over'
+        ctx.globalAlpha = 1
+      }
+    }
+    watch(() => props.model, updateCtx)
+
     // 绘制画笔墨迹方法
     const draw = (posX: number, posY: number, lineWidth: number) => {
       if (!ctx) return
@@ -205,9 +234,10 @@ export default defineComponent({
         draw(x, y, lineWidth)
         lastLineWidth = lineWidth
       }
+      else if (props.model === 'mark') draw(x, y, markSize)
       else erase(x, y)
 
-      lastPos = {x, y}
+      lastPos = { x, y }
       lastTime = new Date().getTime()
     }
 
@@ -266,6 +296,7 @@ export default defineComponent({
       mouseInCanvas,
       penSize,
       rubberSize,
+      markSize,
       writingBoardRef,
       canvasRef,
       canvasWidth,
diff --git a/src/plugins/icon.ts b/src/plugins/icon.ts
index a7bc3070..8beb17f4 100644
--- a/src/plugins/icon.ts
+++ b/src/plugins/icon.ts
@@ -96,6 +96,7 @@ import {
   Power,
   ListView,
   Magic,
+  HighLight,
 } from '@icon-park/vue-next'
 
 export default {
@@ -215,6 +216,7 @@ export default {
     app.component('IconPower', Power)
     app.component('IconListView', ListView)
     app.component('IconMagic', Magic)
+    app.component('IconHighLight', HighLight)
 
     // 视频播放器
     app.component('IconPause', Pause)
diff --git a/src/views/Screen/WritingBoardTool.vue b/src/views/Screen/WritingBoardTool.vue
index 422a3afb..da702021 100644
--- a/src/views/Screen/WritingBoardTool.vue
+++ b/src/views/Screen/WritingBoardTool.vue
@@ -16,10 +16,13 @@
 
     <div class="tools" :style="position">
       <Tooltip :mouseLeaveDelay="0" :mouseEnterDelay="0.3" title="画笔">
-        <div class="btn" :class="{ 'active': writingBoardModel === 'pen' }" @click="changePen()"><IconWrite class="icon" /></div>
+        <div class="btn" :class="{ 'active': writingBoardModel === 'pen' }" @click="changeModel('pen')"><IconWrite class="icon" /></div>
+      </Tooltip>
+      <Tooltip :mouseLeaveDelay="0" :mouseEnterDelay="0.3" title="荧光笔">
+        <div class="btn" :class="{ 'active': writingBoardModel === 'mark' }" @click="changeModel('mark')"><IconHighLight class="icon" /></div>
       </Tooltip>
       <Tooltip :mouseLeaveDelay="0" :mouseEnterDelay="0.3" title="橡皮擦">
-        <div class="btn" :class="{ 'active': writingBoardModel === 'eraser' }" @click="changeEraser()"><IconErase class="icon" /></div>
+        <div class="btn" :class="{ 'active': writingBoardModel === 'eraser' }" @click="changeModel('eraser')"><IconErase class="icon" /></div>
       </Tooltip>
       <Tooltip :mouseLeaveDelay="0" :mouseEnterDelay="0.3" title="清除墨迹">
         <div class="btn" @click="clearCanvas()"><IconClear class="icon" /></div>
@@ -48,7 +51,7 @@
 import { defineComponent, PropType, ref } from 'vue'
 import WritingBoard from '@/components/WritingBoard.vue'
 
-const writingBoardColors = ['#000000', '#ffffff', '#1e497b', '#4e81bb', '#e2534d', '#9aba60', '#8165a0', '#47acc5', '#f9974c']
+const writingBoardColors = ['#000000', '#ffffff', '#1e497b', '#4e81bb', '#e2534d', '#9aba60', '#8165a0', '#47acc5', '#f9974c', '#ffff3a']
 
 interface Position {
   left?: number | string;
@@ -57,6 +60,8 @@ interface Position {
   bottom?: number | string;
 }
 
+type WritingBoardModel = 'pen' | 'mark' | 'eraser'
+
 export default defineComponent({
   name: 'writing-board-tool',
   emits: ['close'],
@@ -83,17 +88,11 @@ export default defineComponent({
   setup(props, { emit }) {
     const writingBoardRef = ref()
     const writingBoardColor = ref('#e2534d')
-    const writingBoardModel = ref<'pen' | 'eraser'>('pen')
+    const writingBoardModel = ref<WritingBoardModel>('pen')
     const blackboard = ref(false)
 
-    // 切换到画笔状态
-    const changePen = () => {
-      writingBoardModel.value = 'pen'
-    }
-
-    // 切换到橡皮状态
-    const changeEraser = () => {
-      writingBoardModel.value = 'eraser'
+    const changeModel = (model: WritingBoardModel) => {
+      writingBoardModel.value = model
     }
 
     // 清除画布上的墨迹
@@ -101,9 +100,9 @@ export default defineComponent({
       writingBoardRef.value.clearCanvas()
     }
 
-    // 修改画笔颜色，如果当前不处于画笔状态则先切换到画笔状态
+    // 修改画笔颜色，如果当前处于橡皮状态则先切换到画笔状态
     const changeColor = (color: string) => {
-      if (writingBoardModel.value !== 'pen') writingBoardModel.value = 'pen'
+      if (writingBoardModel.value === 'eraser') writingBoardModel.value = 'pen'
       writingBoardColor.value = color
     }
     
@@ -118,8 +117,7 @@ export default defineComponent({
       writingBoardColor,
       writingBoardModel,
       blackboard,
-      changePen,
-      changeEraser,
+      changeModel,
       clearCanvas,
       changeColor,
       closeWritingBoard,