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- 我做了一个手写春联小网页，祝大家虎年暴富

heBody
2022-01-28
随笔
目录

# 我做了一个手写春联小网页，祝大家虎年暴富原创

### # 前言

虎年春节快到了，首先祝大家新年快乐，轻松暴富。 最近在网上经常看到生成春联的文章，不过这些小demo要么功能简陋,要么UI特别‘程序员’，满足不了我挑剔的眼光。干脆我自己做一个吧，顺便简单体验一下vite+vue3。（因为页面相对简单，vue组件风格还是使用选项式api，重点还是想把产品快速做出来。）

### # 产品构思

包含`手写春节`和`生成春联`两大功能：

- 手写春联

  - 模拟用笔写字的字迹
  - 选择画笔颜色
  - 调整画笔大小
  - 清空画布
  - 撤回笔画
  - 切换上、下联、横批、福字
  - 随机切换对联提示
  - 预览图片和下载
  - 贴春联海报和下载

- 生成模式

  - 选择画笔颜色
  - 挑选生成的对联
  - 输入对联
  - 随机切换对联
  - 贴春联海报和下载

- 其他

  - 快速切换模式按钮
  - 可控制的背景音乐
  - 微信分享网页

### # 设计

### # 开发

- 技术栈
  - vite (打包&构建)
  - vue3 (页面开发)
  - vant（ui）
  - sass (css)
  - smooth-signature.js (带笔锋手写库)
    (opens new window)

    <template>
      <div class="wrap" :class="'mode-' + mode" @touchstart="handleTouchstart">
        <!-- 切换模式按钮 -->
        <div class="toggle-mode-btn" @click="toggleMode">
          {{ mode === 1 ? '手写' : '生成' }}
          <i class="iconfont icon-qiehuan"></i>
        </div>

        <!-- 工具栏 -->
        <div
          class="actions"
          :style="{ borderTopRightRadius: colorListVisibility ? '0' : '5px' }"
        >
          <!-- 手写模式显示 -->
          <template v-if="mode === 1">
            <!-- 调色板 -->
            <div class="palette btn-block">
              <div
                class="cur-color"
                @click="togglePalette"
                :style="{ background: colorList[curColorIndex] }"
              ></div>
              <ul class="colorList" v-show="colorListVisibility">
                <li
                  v-for="(item, index) in colorList"
                  :key="item"
                  :style="{ background: item }"
                  @click="selectColor(index)"
                ></li>
              </ul>
            </div>

            <!-- 滑块 -->
            <div class="slider-box btn-block">
              <van-slider
                v-model="progress"
                vertical
                @change="changeProgress"
                bar-height="28"
                active-color="transparent"
                :min="50"
                :max="150"
              >
                <template #button>
                  <div class="custom-button"></div>
                </template>
              </van-slider>
            </div>

            <!-- 清空 -->
            <div class="btn" @click="handleClear">
              <i class="iconfont icon-lajitong"></i>
            </div>

            <!-- 撤销 -->
            <div class="btn" @click="handleUndo">
              <i class="iconfont icon-fanhui"></i>
            </div>

            <div class="line"></div>

            <!-- 切换画布的按钮 -->
            <div
              class="btn"
              :class="{ 'cur-active': curCanvasIndex === index }"
              v-for="(item, index) in canvasList"
              :key="item.name"
              @click="changeCanvas(index)"
            >
              {{ item.name }}
            </div>

            <div class="line"></div>

            <div class="btn prominent" @click="handlePreview">预览</div>
            <div class="btn prominent" @click="openPosters">贴联</div>
          </template>

          <!-- 生成模式显示 -->
          <template v-else>
            <!-- 选颜色 -->
            <div
              class="color-list-quick"
              :class="{ active: curColorIndex === index }"
              v-for="(item, index) in colorList"
              :key="item"
              :style="{ background: item }"
              @click="selectColor(index)"
            ></div>
            <div class="line"></div>
            <div class="btn" @click="showPickBox = true">挑选</div>
            <div class="btn" @click="showInputBox = true">输入</div>

            <!-- 挑选对联弹窗 -->
            <van-action-sheet v-model:show="showPickBox" title="请挑选对联">
              <ul class="duilian-list">
                <li
                  v-for="(item, index) in duilianList"
                  :key="index"
                  @click="handlePickDuilian(item)"
                >
                  <span>{{ item.shang }}</span
                  >， <span>{{ item.xia }}</span
                  >。
                  <span>{{ item.heng }}</span>
                </li>
              </ul>
            </van-action-sheet>

            <!-- 输入对联弹窗 -->
            <van-action-sheet v-model:show="showInputBox" title="请输入对联">
              <van-form @submit="handleSubmitInput">
                <van-cell-group inset>
                  <van-field
                    v-model="shanglian"
                    name="shang"
                    label="上联"
                    placeholder="上联"
                    :rules="[
                      {
                        required: true,
                        message: '请输入7位汉字上联',
                        pattern: /^[\u4e00-\u9fa5]{7}$/
                      }
                    ]"
                    clearable
                  />
                  <van-field
                    v-model="xialian"
                    name="xia"
                    label="下联"
                    placeholder="下联"
                    :rules="[
                      {
                        required: true,
                        message: '请输入7位汉字下联',
                        pattern: /^[\u4e00-\u9fa5]{7}$/
                      }
                    ]"
                    clearable
                  />
                  <van-field
                    v-model="hengpi"
                    name="heng"
                    label="横批"
                    placeholder="横批"
                    :rules="[
                      {
                        required: true,
                        message: '请输入4位汉字横批',
                        pattern: /^[\u4e00-\u9fa5]{4}$/
                      }
                    ]"
                    clearable
                  />
                </van-cell-group>
                <div style="margin: 16px">
                  <van-button
                    round
                    block
                    type="primary"
                    native-type="submit"
                    color="linear-gradient(to right, #ff6034, #c33825)"
                  >
                    完成
                  </van-button>
                </div>
              </van-form>
            </van-action-sheet>
          </template>
        </div>

        <!-- 模式1-春联画布 -->
        <div
          v-show="mode === 1"
          v-for="(item, index) in canvasList"
          :key="item.name"
        >
          <canvas
            class="canvas"
            :class="item.className"
            v-show="curCanvasIndex === index"
            :style="{
              marginTop:
                item.height < clientHeight
                  ? `${(clientHeight - item.height) / 2}px`
                  : 0,
              marginLeft:
                item.width < clientWidth ? `${(clientWidth - item.width) / 2}px` : 0
            }"
          />
        </div>

        <!-- 模式2-春联画布 -->
        <div v-show="mode === 2" class="canvas-mode-2">
          <div class="row">
            <canvas id="canvas-top" :width="200 * scale" :height="60 * scale" />
          </div>
          <div class="row">
            <canvas id="canvas-left" :width="60 * scale" :height="364 * scale" />
            <canvas id="canvas-right" :width="60 * scale" :height="364 * scale" />
          </div>
        </div>

        <!-- 贴春联按钮 -->
        <Button class="btn-posters" @click="openPosters" />

        <!-- footer-当前对联提示 -->
        <footer v-if="duilian.shang">
          <div class="refresh-btn" @click="handleRefresh(true)">
            <i class="iconfont icon-shuaxin" :class="{ rotate: isRotate }"></i>
          </div>
          <dl class="duilian">
            <dt>对联</dt>
            <dd>
              <div>{{ duilian.shang }}</div>
              <div>{{ duilian.xia }}</div>
            </dd>
          </dl>
          <dl>
            <dt>横批</dt>
            <dd>{{ duilian.heng }}</dd>
          </dl>
        </footer>

        <!-- 分享按钮 -->
        <div class="share-btn" v-if="isShowShareBtn" @click="isShowShareTip = true">
          <i class="iconfont icon-fenxiang"></i>
        </div>
        <!-- 微信分享提示语 -->
        <div
          class="share-tip"
          v-if="isShowShareTip"
          @click="isShowShareTip = false"
        >
          点击右上角把这个工具分享给朋友
          <div class="hand">👆</div>
        </div>

        <!-- 保存tip -->
        <p v-if="isShowTip" class="download-tip">*长按图片保存或转发</p>

        <!-- 版权 -->
        <div class="copyright">公众号「有趣研究社」 ©版权所有</div>

        <!-- 载入图片元素，用于快速贴图使用, 注意设置crossorigin="anonymous"解决跨域 -->
        <div v-if="isReadImages">
          <img
            crossorigin="anonymous"
            v-for="(item, index) in bgList"
            :src="item"
            :key="item"
            class="hide-img"
            :id="`bg-img-` + index"
          />
          <img
            crossorigin="anonymous"
            class="hide-img"
            id="qrcode"
            src="https://cdn.jsdelivr.net/gh/xugaoyi/image_store2@master/img/qrcode.zul0pldsuao.png"
          />
        </div>

        <!-- 背景音乐 -->
        <audio
          src="https://cdn.jsdelivr.net/gh/xugaoyi/image_store2@master/cjxq.mp3"
          id="bgm"
          ref="bgm"
          loop
        />
        <div
          class="play-btn"
          :class="{ paused: !isPlay }"
          ref="playBtn"
          @click="handlePlay"
        >
          <i class="iconfont icon-yinle"></i>
        </div>
      </div>

      <div class="body-bg-img"></div>
    </template>

    <script>
    import { ImagePreview, Notify } from 'vant'
    import { isWX, isMobile } from '@/utils'
    import Button from '@/components/Button.vue'
    import dl from '@/assets/img/yh/dl.jpeg'
    import hp from '@/assets/img/yh/hp.jpeg'
    import fz from '@/assets/img/yh/fz.png'

    // 对联数据
    import duilianList from '@/mock/duilian'

    const PROPORTION = 0.37 // 图片缩小比例
    const INSTANTIATE_NAME = 'signature' // 实例名称
    const MIN_WIDTH = 3 // 画笔最小宽
    const MAX_WIDTH = 12 // 画笔最大宽

    // 海报背景图大小
    const BG_WIDTH = 750
    const BG_HEIGHT = 1448

    // 贴图定位和大小
    const POSITION = [
      { left: 57, top: 510, width: 90, height: 546 }, // 上联
      { left: 600, top: 510, width: 90, height: 546 }, // 下联
      { left: 225, top: 345, width: 300, height: 90 }, // 横幅
      { left: 460, top: 450, width: 130, height: 130 }, // 福字
    ]

    export default {
      name: "Home",
      components: {
        Button
      },
      data() {
        return {
          duilianList,
          mode: Number(localStorage.getItem('mode')) || 1, // 1 手写，2 生成
          curCanvasIndex: 0, // 显示哪个画布
          progress: 100, // 画笔大小的刻度
          clientWidth: document.documentElement.clientWidth,
          clientHeight: document.documentElement.clientHeight,
          canvasList: [
            {
              name: '上联',
              className: 'canvas-a',
              bgImage: dl,
              width: 600 * PROPORTION,
              height: 3640 * PROPORTION,
            },
            {
              name: '下联',
              className: 'canvas-b',
              bgImage: dl,
              width: 600 * PROPORTION,
              height: 3640 * PROPORTION,
            },
            {
              name: '横批',
              className: 'canvas-c',
              bgImage: hp,
              width: 2000 * PROPORTION,
              height: 600 * PROPORTION,
            },
            {
              name: '福字',
              className: 'canvas-d',
              bgImage: fz,
              width: 366,
              height: 366,
            }
          ],
          colorList: ['#000000', '#ffd800', '#e8bd48', '#ddc08c',],
          curColorIndex: 0,
          colorListVisibility: false, // 画布颜色选择列表可见性
          isShowTip: false, // 是否显示底部提示语
          duilian: {}, // 当前对联文本对象
          isRotate: false, // 刷新icon旋转
          bgList: [
            'https://cdn.jsdelivr.net/gh/xugaoyi/image_store@master/1.4j8qpdnq80i0.jpeg',
            'https://cdn.jsdelivr.net/gh/xugaoyi/image_store@master/4.4460an8ag5o0.jpeg',
            'https://cdn.jsdelivr.net/gh/xugaoyi/image_store@master/5.3axtl4xpvy00.jpeg',
            'https://cdn.jsdelivr.net/gh/xugaoyi/image_store@master/6.2lnbphdqjaq0.jpeg',
          ],
          isReadImages: false, // 延迟加载图片用
          isShowShareBtn: false, // 是否显示分享按钮
          isShowShareTip: false, // 是否显示分享提示语
          isPlay: false, // 是否在播放

          // 模式2
          canvasTop: null, // 横批
          canvasLeft: null, // 上联
          canvasRight: null, // 下联
          imgObj1: null, // 横批图片对象
          imgObj2: null, // 上下联图片对象
          scale: Math.max(window.devicePixelRatio || 1, 2), // 用于增加画布清晰度
          showPickBox: false, // 挑选对联的弹框
          showInputBox: false, // 输入对联的弹框
          shanglian: '', // 输入的上联
          xialian: '', // 输入的下联
          hengpi: '', // 输入的横批
        };
      },
      computed: {
        // 模式1-当前画布实例
        curCanvasInstantiate() {
          return this[INSTANTIATE_NAME + this.curCanvasIndex]
        }
      },
      created() {
        // 微信浏览器显示分享按钮
        this.isShowShareBtn = isWX()
      },
      mounted() {
        if (!isMobile()) {
          Notify({ type: 'warning', message: '请用移动端打开获得最佳体验', duration: 6000, });
        }

        this.initMode1();

        // 初始化对联提示
        this.handleRefresh();

        this.initMode2();

        // 按钮添加激活时发光效果class
        const btnEl = document.querySelectorAll('.btn,.btn-block');
        btnEl.forEach((item) => {
          item.addEventListener('touchstart', () => {
            item.classList.add('btn-active')
          })
          item.addEventListener('touchend', () => {
            setTimeout(() => {
              item.classList.remove('btn-active')
            }, 100)
          })
        })

        // 延迟加载贴图背景
        setTimeout(() => {
          this.isReadImages = true
        }, 1000)
      },

      watch: {
        // 切换画笔颜色
        curColorIndex() {
          this.curCanvasInstantiate.color = this.colorList[this.curColorIndex]
          if (this.mode === 2) {
            this.refreshDuilian()
          }
        },
        // 切换画布时应用当前画笔颜色和大小
        curCanvasIndex() {
          this.curCanvasInstantiate.color = this.colorList[this.curColorIndex]
          this.handleChangeSize()
          window.scrollTo(0, 0)
        }
      },

      methods: {
        initMode1() {
          const { colorList, curColorIndex } = this
          this.canvasList.forEach((item, index) => {
            const options = {
              width: item.width,
              height: item.height,
              minWidth: MIN_WIDTH, // 画笔最小宽度(px)
              maxWidth: MAX_WIDTH, // 画笔最大宽度
              minSpeed: 1.8, // 画笔达到最小宽度所需最小速度(px/ms)，取值范围1.0-10.0
              color: colorList[curColorIndex],
              // 新增的配置
              bgImage: item.bgImage,
            };

            this[INSTANTIATE_NAME + index] = new SmoothSignature(document.querySelector('.' + item.className), options);
          })
        },

        initMode2() {
          this.canvasTop = document.getElementById('canvas-top').getContext('2d')
          this.canvasLeft = document.getElementById('canvas-left').getContext('2d')
          this.canvasRight = document.getElementById('canvas-right').getContext('2d')

          // 设字体样式
          const font = "36px xs, cursive"
          this.canvasTop.font = font
          this.canvasLeft.font = font
          this.canvasRight.font = font

          // 增强清晰度
          const { scale } = this
          this.canvasTop.scale(scale, scale);
          this.canvasLeft.scale(scale, scale);
          this.canvasRight.scale(scale, scale);

          // 设背景图
          this.imgObj1 = new Image()
          this.imgObj2 = new Image()
          this.imgObj1.src = hp
          this.imgObj2.src = dl
          this.imgObj1.onload = () => {
            // 贴背景
            this.canvasTop.drawImage(this.imgObj1, 0, 0, 200, 60)

            // 字体加载完成后
            document.fonts.ready.then(() => {
              this.handleTopFillText()
            });
          }
          this.imgObj2.onload = () => {
            // 贴背景
            this.canvasLeft.drawImage(this.imgObj2, 0, 0, 60, 364)
            this.canvasRight.drawImage(this.imgObj2, 0, 0, 60, 364)

            // 字体加载完成后
            document.fonts.ready.then(() => {
              this.handleLRFillText(this.canvasLeft, this.duilian.shang)
              this.handleLRFillText(this.canvasRight, this.duilian.xia)
            });
          }
        },

        // 模式2-刷新对联
        refreshDuilian() {
          this.canvasTop.drawImage(this.imgObj1, 0, 0, 200, 60)
          this.canvasLeft.drawImage(this.imgObj2, 0, 0, 60, 364)
          this.canvasRight.drawImage(this.imgObj2, 0, 0, 60, 364)
          this.handleTopFillText()
          this.handleLRFillText(this.canvasLeft, this.duilian.shang)
          this.handleLRFillText(this.canvasRight, this.duilian.xia)
        },

        // 模式2-贴横批
        handleTopFillText() {
          // 贴文本
          this.canvasTop.fillStyle = this.colorList[this.curColorIndex]
          if (this.duilian.heng) {
            this.duilian.heng.split('').forEach((item, index) => {
              const left = 42 * (index + 1) - 22
              this.canvasTop.fillText(item, left, 40)
            })
          }
        },

        // 模式2-贴上下联
        handleLRFillText(ctx, text) {
          ctx.fillStyle = this.colorList[this.curColorIndex]
          if (text) {
            text.split('').forEach((item, index) => {
              const top = 50 * (index + 1) - 8
              ctx.fillText(item, 13, top)
            })
          }
        },

        // 切换模式
        toggleMode() {
          if (this.mode === 1) {
            this.mode = 2
            this.refreshDuilian()
          } else {
            this.mode = 1
          }
          localStorage.setItem('mode', this.mode);
        },

        // 打开调色板
        togglePalette() {
          this.colorListVisibility = !this.colorListVisibility
        },

        // 关闭调色板
        handleTouchstart(e) {
          // 不是点击选择颜色时
          if (e.path[1]?.classList?.value !== 'colorList' && e.target.classList?.value !== 'cur-color') {
            this.colorListVisibility = false
          }
        },

        // 选择颜色
        selectColor(index) {
          this.curColorIndex = index
          this.colorListVisibility = false
        },

        // 切换画布
        changeCanvas(index) {
          this.curCanvasIndex = index
        },

        // 清空画布
        handleClear() {
          this.curCanvasInstantiate.clear();
        },

        // 撤销笔画
        handleUndo() {
          this.curCanvasInstantiate.undo();
        },

        // 预览
        handlePreview() {
          this.showTopTip();
          this.isShowTip = true
          const _this = this
          ImagePreview({
            images: this.getImageList(),
            closeable: true,
            startPosition: this.curCanvasIndex,
            onClose() {
              _this.isShowTip = false
            },
          });
        },

        // 打开海报预览
        openPosters() {
          // 创建画布
          const canvas = document.createElement('canvas');
          canvas.width = BG_WIDTH
          canvas.height = BG_HEIGHT
          const ctx = canvas.getContext('2d');
          const resultImageList = [];

          // 是否隐藏福字
          const isHideFu = this[INSTANTIATE_NAME + 3].isEmpty()
          this.bgList.forEach((item, index) => {
            // 贴背景图
            ctx.drawImage(document.getElementById('bg-img-' + index), 0, 0, BG_WIDTH, BG_HEIGHT)

            // 贴对联
            if (this.mode === 1) {
              this.canvasList.forEach((item, index) => {
                if (index === 3 && isHideFu) return;
                const dlCanvas = document.querySelector('.' + item.className)
                const { left, top, width, height } = POSITION[index]
                ctx.drawImage(dlCanvas, left, top, width, height)
              })
            } else {
              ['canvas-left', 'canvas-right', 'canvas-top'].forEach((item, index) => {
                const dlCanvas = document.getElementById(item)
                const { left, top, width, height } = POSITION[index]
                ctx.drawImage(dlCanvas, left, top, width, height)
              })
            }

            // 贴二维码
            ctx.drawImage(document.getElementById("qrcode"), 40, 1280, 580, 136)

            // 贴文本
            ctx.font = "18px sans-serif"
            ctx.fillStyle = "#666666"
            ctx.fillText('©公众号「有趣研究社」', 550, 1420)

            // 导出图片
            resultImageList.push(canvas.toDataURL('image/jpeg', 0.8))
          })

          // 打开图片预览
          this.isShowTip = true
          const _this = this
          ImagePreview({
            images: resultImageList,
            closeable: true,
            onClose() {
              _this.isShowTip = false
            },
          });
          this.showTopTip();
        },

        // 弹出顶部提示语
        showTopTip() {
          if (!sessionStorage.getItem('showTip')) {
            sessionStorage.setItem('showTip', 'true');
            Notify({
              message: '长按图片可保存到本地',
              color: '#c33825',
              background: '#eed3ae',
            });
          }
        },

        // 获取对联图片列表
        getImageList(type = 'image/png') {
          const imageList = []
          this.canvasList.forEach((item, index) => {
            if (index === 3) {
              // `福`字必须是png格式
              type = 'image/png'
            }
            imageList.push(this[INSTANTIATE_NAME + index].toDataURL(type, 0.8))
          })
          return imageList
        },

        // 进度改变时
        changeProgress(progress) {
          this.progress = progress
          this.handleChangeSize()
        },

        // 调整画笔大小
        handleChangeSize() {
          const { progress } = this
          this.curCanvasInstantiate.minWidth = MIN_WIDTH * progress / 100
          this.curCanvasInstantiate.maxWidth = MAX_WIDTH * progress / 100
        },

        // 刷新对联
        handleRefresh(rotate) {
          this.duilian = duilianList[Math.floor(Math.random() * duilianList.length)]

          if (rotate) {
            if (this.mode === 2) {
              this.refreshDuilian()
            }
            // 使icon旋转
            this.isRotate = true
            setTimeout(() => {
              this.isRotate = false
            }, 300)
          }
        },

        // 播放背景音乐
        handlePlay() {
          const { bgm } = this.$refs
          if (bgm.paused) {
            bgm.play()
            this.isPlay = true
          } else {
            bgm.pause()
            this.isPlay = false
          }
        },

        // 完成输入对联
        handleSubmitInput(values) {
          this.duilian = values
          this.showInputBox = false
          this.refreshDuilian()
        },

        // 完成挑选对联
        handlePickDuilian(item) {
          this.duilian = item
          this.showPickBox = false
          this.refreshDuilian()
        }
      },
    };
    </script>

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