|
@@ -0,0 +1,721 @@
|
|
|
+<template>
|
|
|
+ <view class="almost-lottery" :style="{ width: canvasWidth + 40 + 'px', height: canvasHeight + 40 + 'px'}">
|
|
|
+ <view class="almost-lottery__wrap" :style="{width: canvasWidth + canvasMarginTotal + 'px', height: canvasHeight + canvasMarginTotal + 'px'}">
|
|
|
+ <!-- #ifdef MP-ALIPAY -->
|
|
|
+ <canvas :class="className" :id="canvasId" :width="canvasWidth" :height="canvasHeight" :style="{
|
|
|
+ width: canvasWidth + 'px',
|
|
|
+ height: canvasHeight + 'px'
|
|
|
+ }" />
|
|
|
+ <!-- #endif -->
|
|
|
+ <!-- #ifndef MP-ALIPAY -->
|
|
|
+ <canvas :class="className" :canvas-id="canvasId" :width="canvasWidth" :height="canvasHeight" :style="{
|
|
|
+ width: canvasWidth + 'px',
|
|
|
+ height: canvasHeight + 'px'
|
|
|
+ }" />
|
|
|
+ <!-- #endif -->
|
|
|
+ <image class="canvas-img" :src="lotteryImg" :style="{
|
|
|
+ width: canvasWidth + canvasMarginTotal + 'px',
|
|
|
+ height: canvasHeight + canvasMarginTotal + 'px',
|
|
|
+ transform: `rotate(${canvasAngle + targetAngle}deg)`,
|
|
|
+ transitionDuration: `${transitionDuration}s`
|
|
|
+ }"
|
|
|
+ v-if="lotteryImg"></image>
|
|
|
+ <view class="almost-lottery__action" :style="{
|
|
|
+ width: actionSize + 'px',
|
|
|
+ height: actionSize + 'px'
|
|
|
+ }" @click="handleActionStart"></view>
|
|
|
+ <!-- 为了兼容 app 端 ctx.measureText 所需的标签 -->
|
|
|
+ <text class="almost-lottery__measureText">{{ measureText }}</text>
|
|
|
+ </view>
|
|
|
+ </view>
|
|
|
+</template>
|
|
|
+
|
|
|
+<script>
|
|
|
+ import { pathToBase64 } from '@/almost-utils/image-tools.js'
|
|
|
+ import { getStore, setStore, clearStore, downloadFile } from '@/almost-utils/almost-utils.js'
|
|
|
+ export default {
|
|
|
+ name: 'AlmostLottery',
|
|
|
+ props: {
|
|
|
+ // canvas 宽度
|
|
|
+ canvasWidth: {
|
|
|
+ type: Number,
|
|
|
+ default: 240
|
|
|
+ },
|
|
|
+ // canvas 高度
|
|
|
+ canvasHeight: {
|
|
|
+ type: Number,
|
|
|
+ default: 240
|
|
|
+ },
|
|
|
+ // 奖品列表
|
|
|
+ prizeList: {
|
|
|
+ type: Array,
|
|
|
+ required: true,
|
|
|
+ validator: (value) => {
|
|
|
+ return value.length > 1
|
|
|
+ }
|
|
|
+ },
|
|
|
+ // 中奖奖品在列表中的下标
|
|
|
+ prizeIndex: {
|
|
|
+ type: Number,
|
|
|
+ required: true
|
|
|
+ },
|
|
|
+ // 奖品区块对应背景颜色
|
|
|
+ colors: {
|
|
|
+ type: Array,
|
|
|
+ default: () => [
|
|
|
+ '#FFFFFF',
|
|
|
+ '#FFE9AA'
|
|
|
+ ]
|
|
|
+ },
|
|
|
+ // 旋转动画时间 单位s
|
|
|
+ duration: {
|
|
|
+ type: Number,
|
|
|
+ default: 8
|
|
|
+ },
|
|
|
+ // 旋转的圈数
|
|
|
+ ringCount: {
|
|
|
+ type: Number,
|
|
|
+ default: 8
|
|
|
+ },
|
|
|
+ // 指针位置
|
|
|
+ pointerPosition: {
|
|
|
+ type: String,
|
|
|
+ default: 'edge',
|
|
|
+ validator: (value) => {
|
|
|
+ return value === 'edge' || value === 'middle'
|
|
|
+ }
|
|
|
+ },
|
|
|
+ // 字体颜色
|
|
|
+ fontColor: {
|
|
|
+ type: String,
|
|
|
+ default: '#C30B29'
|
|
|
+ },
|
|
|
+ // 文字的大小
|
|
|
+ fontSize: {
|
|
|
+ type: Number,
|
|
|
+ default: 12
|
|
|
+ },
|
|
|
+ // 奖品文字多行情况下的行高
|
|
|
+ lineHeight: {
|
|
|
+ type: Number,
|
|
|
+ default: 16
|
|
|
+ },
|
|
|
+ // 奖品名称所对应的 key 值
|
|
|
+ strKey: {
|
|
|
+ type: String,
|
|
|
+ default: 'name'
|
|
|
+ },
|
|
|
+ // 奖品文字总长度限制
|
|
|
+ strMaxLen: {
|
|
|
+ type: Number,
|
|
|
+ default: 12
|
|
|
+ },
|
|
|
+ // 奖品文字多行情况下第一行文字长度
|
|
|
+ strLineLen: {
|
|
|
+ type: Number,
|
|
|
+ default: 6
|
|
|
+ },
|
|
|
+ // 奖品图片的宽
|
|
|
+ imageWidth: {
|
|
|
+ type: Number,
|
|
|
+ default: 30
|
|
|
+ },
|
|
|
+ // 奖品图片的高
|
|
|
+ imageHeight: {
|
|
|
+ type: Number,
|
|
|
+ default: 30
|
|
|
+ },
|
|
|
+ // 转盘绘制成功的提示
|
|
|
+ successMsg: {
|
|
|
+ type: String,
|
|
|
+ default: '奖品准备就绪,快来参与抽奖吧'
|
|
|
+ },
|
|
|
+ // 转盘绘制失败的提示
|
|
|
+ failMsg: {
|
|
|
+ type: String,
|
|
|
+ default: '奖品仍在准备中,请稍后再来...'
|
|
|
+ },
|
|
|
+ // 是否开启画板的缓存
|
|
|
+ canvasCached: {
|
|
|
+ type: Boolean,
|
|
|
+ default: true
|
|
|
+ },
|
|
|
+ // 内圈与外圈的间距
|
|
|
+ canvasMargin: {
|
|
|
+ type: Number,
|
|
|
+ default: 5
|
|
|
+ }
|
|
|
+ },
|
|
|
+ data() {
|
|
|
+ return {
|
|
|
+ // 画板className
|
|
|
+ className: 'almost-lottery__canvas',
|
|
|
+ // 画板标识
|
|
|
+ canvasId: 'almostLotteryCanvas',
|
|
|
+ // 画板导出的图片
|
|
|
+ lotteryImg: '',
|
|
|
+ // 旋转到奖品目标需要的角度
|
|
|
+ targetAngle: 0,
|
|
|
+ // 旋转动画时间 单位 s
|
|
|
+ transitionDuration: 0,
|
|
|
+ // 是否正在旋转
|
|
|
+ isRotate: false,
|
|
|
+ // 当前停留在那个奖品的序号
|
|
|
+ stayIndex: 0,
|
|
|
+ // 当前中奖奖品的序号
|
|
|
+ targetIndex: 0,
|
|
|
+ // 是否存在可用的缓存转盘图
|
|
|
+ isCacheImg: false,
|
|
|
+ oldLotteryImg: '',
|
|
|
+ // 解决 app 不支持 measureText 的问题
|
|
|
+ // app 已在 2.9.3 的版本中提供了对 measureText 的支持,将在后续版本逐渐稳定后移除相关兼容代码
|
|
|
+ measureText: ''
|
|
|
+ }
|
|
|
+ },
|
|
|
+ computed: {
|
|
|
+ // 根据奖品列表计算 canvas 旋转角度
|
|
|
+ canvasAngle() {
|
|
|
+ let prizeCount = this.prizeList.length
|
|
|
+ let prizeClip = 360 / prizeCount
|
|
|
+ let result = 0
|
|
|
+
|
|
|
+ let diffNum = 90 / prizeClip
|
|
|
+ if (this.pointerPosition === 'edge') {
|
|
|
+ result = -(prizeClip * diffNum)
|
|
|
+ } else {
|
|
|
+ result = -(prizeClip * diffNum + prizeClip / 2)
|
|
|
+ }
|
|
|
+ return result
|
|
|
+ },
|
|
|
+ // 外圆的半径
|
|
|
+ outsideRadius() {
|
|
|
+ return this.canvasWidth / 2
|
|
|
+ },
|
|
|
+ // 内圆的半径
|
|
|
+ insideRadius() {
|
|
|
+ return 20
|
|
|
+ },
|
|
|
+ // 字体的半径
|
|
|
+ textRadius() {
|
|
|
+ return this.fontSize / 2
|
|
|
+ },
|
|
|
+ // 根据画板的宽度计算奖品文字与中心点的距离
|
|
|
+ textDistance() {
|
|
|
+ const textZeroY = Math.round(this.outsideRadius - (this.insideRadius / 2))
|
|
|
+ return textZeroY - this.textRadius
|
|
|
+ },
|
|
|
+ // 设备像素密度
|
|
|
+ pixelRatio() {
|
|
|
+ return uni.getSystemInfoSync().pixelRatio
|
|
|
+ },
|
|
|
+ // 内圈与外圈的距离
|
|
|
+ canvasMarginTotal () {
|
|
|
+ let diffNum = 5
|
|
|
+ let margin = this.canvasMargin * 2
|
|
|
+ if (this.canvasWidth > 240) {
|
|
|
+ return -(this.canvasWidth / 240 * 2) - margin
|
|
|
+ } else if (this.canvasWidth < 240) {
|
|
|
+ return diffNum + (this.canvasWidth / 240 * 2) - margin
|
|
|
+ } else {
|
|
|
+ return diffNum - margin
|
|
|
+ }
|
|
|
+ },
|
|
|
+ // 抽奖按钮的宽高
|
|
|
+ actionSize () {
|
|
|
+ return this.canvasWidth / 2.4
|
|
|
+ }
|
|
|
+ },
|
|
|
+ watch: {
|
|
|
+ // 监听获奖序号的变动
|
|
|
+ prizeIndex(newVal, oldVal) {
|
|
|
+ if (newVal > -1) {
|
|
|
+ this.targetIndex = newVal
|
|
|
+ this.onRotateStart()
|
|
|
+ } else {
|
|
|
+ console.info('旋转结束,prizeIndex 已重置')
|
|
|
+ }
|
|
|
+ }
|
|
|
+ },
|
|
|
+ methods: {
|
|
|
+ resetAngle(){
|
|
|
+ let prizeCount = this.prizeList.length
|
|
|
+ let prizeClip = 360 / prizeCount
|
|
|
+ this.targetAngle = this.targetAngle - prizeClip/2
|
|
|
+ },
|
|
|
+ // 开始旋转
|
|
|
+ onRotateStart() {
|
|
|
+ if (this.isRotate) return
|
|
|
+ this.isRotate = true
|
|
|
+ // 奖品总数
|
|
|
+ let prizeCount = this.prizeList.length
|
|
|
+ let baseAngle = 360 / prizeCount
|
|
|
+ let angles = 0
|
|
|
+ if (this.targetAngle === 0) {
|
|
|
+ // 第一次旋转
|
|
|
+ // 因为第一个奖品是从0°开始的,即水平向右方向
|
|
|
+ // 第一次旋转角度 = 270度 - (停留的序号-目标序号) * 每个奖品区间角度 - 每个奖品区间角度的一半 - canvas自身旋转的度数
|
|
|
+ angles = (270 - (this.targetIndex - this.stayIndex) * baseAngle - baseAngle / 2) - this.canvasAngle
|
|
|
+ } else {
|
|
|
+ // 后续旋转
|
|
|
+ // 后续继续旋转 就只需要计算停留的位置与目标位置的角度
|
|
|
+ angles = -(this.targetIndex - this.stayIndex) * baseAngle
|
|
|
+ }
|
|
|
+ // 更新目前序号
|
|
|
+ this.stayIndex = this.targetIndex
|
|
|
+ // 转 8 圈,圈数越多,转的越快
|
|
|
+ this.targetAngle += angles + 360 * this.ringCount
|
|
|
+
|
|
|
+ // 计算转盘结束的时间,预加一些延迟确保转盘停止后触发结束事件
|
|
|
+ let endTime = this.transitionDuration * 1000 + 100
|
|
|
+ let endTimer = setTimeout(() => {
|
|
|
+ clearTimeout(endTimer)
|
|
|
+ endTimer = null
|
|
|
+
|
|
|
+ this.isRotate = false
|
|
|
+ this.$emit('draw-end')
|
|
|
+ }, endTime)
|
|
|
+
|
|
|
+ let resetPrizeTimer = setTimeout(() => {
|
|
|
+ clearTimeout(resetPrizeTimer)
|
|
|
+ resetPrizeTimer = null
|
|
|
+
|
|
|
+ // 每次抽奖结束后都要重置父级附件的 prizeIndex
|
|
|
+ this.$emit('reset-index')
|
|
|
+ }, endTime + 50)
|
|
|
+ },
|
|
|
+ // 点击 开始抽奖 按钮
|
|
|
+ handleActionStart() {
|
|
|
+ this.$emit('draw-start')
|
|
|
+ },
|
|
|
+ // 渲染转盘
|
|
|
+ async onCreateCanvas() {
|
|
|
+ // 获取 canvas 画布
|
|
|
+ const canvasId = this.canvasId
|
|
|
+ const ctx = uni.createCanvasContext(canvasId, this)
|
|
|
+
|
|
|
+ // canvas 的宽高
|
|
|
+ let canvasW = this.canvasWidth
|
|
|
+ let canvasH = this.canvasHeight
|
|
|
+
|
|
|
+ // 根据奖品个数计算 角度
|
|
|
+ let prizeCount = this.prizeList.length
|
|
|
+ let baseAngle = Math.PI * 2 / prizeCount
|
|
|
+
|
|
|
+ // 设置描边颜色
|
|
|
+ ctx.setStrokeStyle('#FFBE04')
|
|
|
+
|
|
|
+ // 设置字体和字号
|
|
|
+ // #ifndef MP
|
|
|
+ let fontFamily =
|
|
|
+ '-apple-system, BlinkMacSystemFont, \'PingFang SC\', \'Helvetica Neue\', STHeiti, \'Microsoft Yahei\', Tahoma, Simsun, sans-serif'
|
|
|
+ ctx.font = `${this.fontSize}px ${fontFamily}`
|
|
|
+ // #endif
|
|
|
+ // #ifdef MP
|
|
|
+ ctx.setFontSize(this.fontSize)
|
|
|
+ // #endif
|
|
|
+
|
|
|
+ // 注意,开始画的位置是从0°角的位置开始画的。也就是水平向右的方向。
|
|
|
+ // 画具体内容
|
|
|
+ for (let i = 0; i < prizeCount; i++) {
|
|
|
+ let prizeItem = this.prizeList[i]
|
|
|
+ // 当前角度
|
|
|
+ let angle = i * baseAngle
|
|
|
+
|
|
|
+ // 保存当前画布的状态
|
|
|
+ ctx.save()
|
|
|
+
|
|
|
+ // 开始画内容
|
|
|
+ ctx.beginPath()
|
|
|
+
|
|
|
+ // 开始画圆弧
|
|
|
+ // x => 圆弧对应的圆心横坐标 x
|
|
|
+ // y => 圆弧对应的圆心横坐标 y
|
|
|
+ // radius => 圆弧的半径大小
|
|
|
+ // startAngle => 圆弧开始的角度,单位是弧度
|
|
|
+ // endAngle => 圆弧结束的角度,单位是弧度
|
|
|
+ // anticlockwise(可选) => 绘制方向,true 为逆时针,false 为顺时针
|
|
|
+ ctx.arc(canvasW * 0.5, canvasH * 0.5, this.outsideRadius, angle, angle + baseAngle, false)
|
|
|
+ ctx.arc(canvasW * 0.5, canvasH * 0.5, this.insideRadius, angle + baseAngle, angle, true)
|
|
|
+
|
|
|
+ // 开始链接线条
|
|
|
+ ctx.stroke()
|
|
|
+ // 每个奖品区块背景填充颜色
|
|
|
+ if (this.colors.length === 2) {
|
|
|
+ ctx.setFillStyle(this.colors[i % 2])
|
|
|
+ } else {
|
|
|
+ ctx.setFillStyle(this.colors[i])
|
|
|
+ }
|
|
|
+ // 填充颜色
|
|
|
+ ctx.fill()
|
|
|
+
|
|
|
+ // 开始绘制奖品内容
|
|
|
+ // 重新映射画布上的 (0,0) 位置
|
|
|
+ let translateX = canvasW * 0.5 + Math.cos(angle + baseAngle / 2) * this.textDistance
|
|
|
+ let translateY = canvasH * 0.5 + Math.sin(angle + baseAngle / 2) * this.textDistance
|
|
|
+ ctx.translate(translateX, translateY)
|
|
|
+
|
|
|
+ // 绘制奖品名称
|
|
|
+ ctx.setFillStyle(this.fontColor)
|
|
|
+ let rewardName = this.strLimit(prizeItem[this.strKey])
|
|
|
+
|
|
|
+ // rotate方法旋转当前的绘图,因为文字是和当前扇形中心线垂直的
|
|
|
+ ctx.rotate(angle + (baseAngle / 2) + (Math.PI / 2))
|
|
|
+
|
|
|
+ // 设置文本位置并处理换行
|
|
|
+ // 是否需要换行
|
|
|
+ let isLineBreak = rewardName.length > this.strLineLen
|
|
|
+ let textOffsetX = this.fontSize === 12 ? 0 : this.textRadius
|
|
|
+ if (isLineBreak) {
|
|
|
+ // 获得多行文本数组
|
|
|
+ rewardName = rewardName.substring(0, this.strLineLen) + ',' + rewardName.substring(this.strLineLen)
|
|
|
+ let rewardNames = rewardName.split(',')
|
|
|
+
|
|
|
+ // 循环文本数组,计算每一行的文本宽度
|
|
|
+ for (let j = 0; j < rewardNames.length; j++) {
|
|
|
+ if (ctx.measureText && ctx.measureText(rewardNames[j]).width) {
|
|
|
+ // 文本的宽度信息
|
|
|
+ let tempStrSize = ctx.measureText(rewardNames[j])
|
|
|
+ ctx.fillText(rewardNames[j], -(tempStrSize.width / 2 + textOffsetX), j * this.lineHeight)
|
|
|
+ } else {
|
|
|
+ this.measureText = rewardNames[j]
|
|
|
+
|
|
|
+ // 等待页面重新渲染
|
|
|
+ await this.$nextTick()
|
|
|
+
|
|
|
+ let textWidth = await this.getTextWidth()
|
|
|
+
|
|
|
+ ctx.fillText(rewardNames[j], -(textWidth / 2 + textOffsetX), j * this.lineHeight)
|
|
|
+ // console.log(rewardNames[j], textWidth, i)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ if (ctx.measureText && ctx.measureText(rewardName).width) {
|
|
|
+ // 文本的宽度信息
|
|
|
+ let tempStrSize = ctx.measureText(rewardName)
|
|
|
+ ctx.fillText(rewardName, -(tempStrSize.width / 2 + textOffsetX), 0)
|
|
|
+ } else {
|
|
|
+ this.measureText = rewardName
|
|
|
+
|
|
|
+ // 等待页面重新渲染
|
|
|
+ await this.$nextTick()
|
|
|
+
|
|
|
+ let textWidth = await this.getTextWidth()
|
|
|
+ ctx.fillText(rewardName, -(textWidth / 2 + textOffsetX), 0)
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // 绘制奖品图片
|
|
|
+ if (prizeItem.prizeImage) {
|
|
|
+ // App-Android平台 系统 webview 更新到 Chrome84+ 后 canvas 组件绘制本地图像 uni.canvasToTempFilePath 会报错
|
|
|
+ // 统一将图片处理成 base64
|
|
|
+ // https://ask.dcloud.net.cn/question/103303
|
|
|
+ let reg = /^(https|http)/g
|
|
|
+ // 处理远程图片
|
|
|
+ if (reg.test(prizeItem.prizeImage)) {
|
|
|
+ console.warn('###当前数据列表中的奖品图片为网络图片,开始下载图片...###')
|
|
|
+ let res = await downloadFile(prizeItem.prizeImage)
|
|
|
+ console.log('处理远程图片', res)
|
|
|
+ if (res.ok) {
|
|
|
+ let tempFilePath = res.tempFilePath
|
|
|
+ // #ifndef MP
|
|
|
+ prizeItem.prizeImage = await pathToBase64(tempFilePath)
|
|
|
+ // #endif
|
|
|
+ // #ifdef MP
|
|
|
+ prizeItem.prizeImage = tempFilePath
|
|
|
+ // #endif
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ // #ifndef MP
|
|
|
+ prizeItem.prizeImage = await pathToBase64(prizeItem.prizeImage)
|
|
|
+ // #endif
|
|
|
+ }
|
|
|
+
|
|
|
+ ctx.drawImage(prizeItem.prizeImage, -(this.imageWidth / 2), canvasW / 10, this.imageWidth, this.imageHeight)
|
|
|
+ }
|
|
|
+
|
|
|
+ ctx.restore()
|
|
|
+ }
|
|
|
+
|
|
|
+ // 保存绘图并导出图片
|
|
|
+ ctx.draw(true, () => {
|
|
|
+ let drawTimer = setTimeout(() => {
|
|
|
+ clearTimeout(drawTimer)
|
|
|
+ drawTimer = null
|
|
|
+
|
|
|
+ // #ifdef MP-ALIPAY
|
|
|
+ ctx.toTempFilePath({
|
|
|
+ destWidth: this.canvasWidth * this.pixelRatio,
|
|
|
+ destHeight: this.canvasHeight * this.pixelRatio,
|
|
|
+ success: (res) => {
|
|
|
+ // console.log(res.apFilePath)
|
|
|
+ this.handlePrizeImg({
|
|
|
+ ok: true,
|
|
|
+ data: res.apFilePath,
|
|
|
+ msg: '画布导出生成图片成功'
|
|
|
+ })
|
|
|
+ },
|
|
|
+ fail: (err) => {
|
|
|
+ this.handlePrizeImg({
|
|
|
+ ok: false,
|
|
|
+ data: err,
|
|
|
+ msg: '画布导出生成图片失败'
|
|
|
+ })
|
|
|
+ }
|
|
|
+ })
|
|
|
+ // #endif
|
|
|
+ // #ifndef MP-ALIPAY
|
|
|
+ uni.canvasToTempFilePath({
|
|
|
+ destWidth: this.canvasWidth * this.pixelRatio,
|
|
|
+ destHeight: this.canvasHeight * this.pixelRatio,
|
|
|
+ canvasId: this.canvasId,
|
|
|
+ success: (res) => {
|
|
|
+ // 在 H5 平台下,tempFilePath 为 base64
|
|
|
+ // console.log(res.tempFilePath)
|
|
|
+ this.handlePrizeImg({
|
|
|
+ ok: true,
|
|
|
+ data: res.tempFilePath,
|
|
|
+ msg: '画布导出生成图片成功'
|
|
|
+ })
|
|
|
+ },
|
|
|
+ fail: (err) => {
|
|
|
+ this.handlePrizeImg({
|
|
|
+ ok: false,
|
|
|
+ data: err,
|
|
|
+ msg: '画布导出生成图片失败'
|
|
|
+ })
|
|
|
+ }
|
|
|
+ }, this)
|
|
|
+ // #endif
|
|
|
+ }, 500)
|
|
|
+ })
|
|
|
+ },
|
|
|
+ // 处理导出的图片
|
|
|
+ handlePrizeImg(res) {
|
|
|
+ if (res.ok) {
|
|
|
+ let data = res.data
|
|
|
+
|
|
|
+ if (!this.canvasCached) {
|
|
|
+ this.lotteryImg = data
|
|
|
+ this.handlePrizeImgSuc(res)
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ // #ifndef H5
|
|
|
+ if (this.isCacheImg) {
|
|
|
+ uni.getSavedFileList({
|
|
|
+ success: (sucRes) => {
|
|
|
+ let fileList = sucRes.fileList
|
|
|
+ // console.log('getSavedFileList Cached', fileList)
|
|
|
+
|
|
|
+ let cached = false
|
|
|
+ for (let i = 0; i < fileList.length; i++) {
|
|
|
+ let item = fileList[i]
|
|
|
+ if (item.filePath === data) {
|
|
|
+ cached = true
|
|
|
+ this.lotteryImg = data
|
|
|
+
|
|
|
+ console.info('经查,本地缓存中存在转盘图可用,本次将不再绘制转盘')
|
|
|
+ this.handlePrizeImgSuc(res)
|
|
|
+ break
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!cached) {
|
|
|
+ console.info('经查,本地缓存中存在转盘图不可用,需要重新初始化转盘绘制')
|
|
|
+ this.initCanvasDraw()
|
|
|
+ }
|
|
|
+ },
|
|
|
+ fail: (err) => {
|
|
|
+ this.initCanvasDraw()
|
|
|
+ }
|
|
|
+ })
|
|
|
+ } else {
|
|
|
+ uni.saveFile({
|
|
|
+ tempFilePath: data,
|
|
|
+ success: (sucRes) => {
|
|
|
+ let filePath = sucRes.savedFilePath
|
|
|
+ // console.log('saveFile', filePath)
|
|
|
+ setStore('lotteryImg', filePath)
|
|
|
+ this.lotteryImg = filePath
|
|
|
+ this.handlePrizeImgSuc({
|
|
|
+ ok: true,
|
|
|
+ data: filePath,
|
|
|
+ msg: '画布导出生成图片成功'
|
|
|
+ })
|
|
|
+ },
|
|
|
+ fail: (err) => {
|
|
|
+ this.handlePrizeImg({
|
|
|
+ ok: false,
|
|
|
+ data: err,
|
|
|
+ msg: '画布导出生成图片失败'
|
|
|
+ })
|
|
|
+ }
|
|
|
+ })
|
|
|
+ }
|
|
|
+ // #endif
|
|
|
+ // #ifdef H5
|
|
|
+ console.info('当前为 H5 端,直接使用导出的/缓存中的 base64 图')
|
|
|
+ setStore('lotteryImg', data)
|
|
|
+ this.lotteryImg = data
|
|
|
+ this.handlePrizeImgSuc(res)
|
|
|
+ // #endif
|
|
|
+ } else {
|
|
|
+ console.error('处理导出的图片失败', res)
|
|
|
+ uni.hideLoading()
|
|
|
+ // #ifdef H5
|
|
|
+ console.error('###当前为 H5 端,下载网络图片需要后端配置允许跨域###')
|
|
|
+ // #endif
|
|
|
+ // #ifdef MP
|
|
|
+ console.error('###当前为小程序端,下载网络图片需要配置域名白名单###')
|
|
|
+ // #endif
|
|
|
+ }
|
|
|
+ },
|
|
|
+ // 处理图片完成
|
|
|
+ handlePrizeImgSuc (res) {
|
|
|
+ uni.hideLoading()
|
|
|
+ this.$emit('finish', {
|
|
|
+ ok: res.ok,
|
|
|
+ data: res.data,
|
|
|
+ msg: res.ok ? this.successMsg : this.failMsg
|
|
|
+ })
|
|
|
+ },
|
|
|
+ // 兼容 app 端不支持 ctx.measureText
|
|
|
+ // 已知问题:初始绘制时,低端安卓机 平均耗时 2s
|
|
|
+ getTextWidth() {
|
|
|
+ return new Promise((resolve, reject) => {
|
|
|
+ uni.createSelectorQuery().in(this).select('.almost-lottery__measureText').fields({
|
|
|
+ size: true,
|
|
|
+ }, (res) => {
|
|
|
+ resolve(res.width)
|
|
|
+ }).exec()
|
|
|
+ })
|
|
|
+ },
|
|
|
+ // 处理文字溢出
|
|
|
+ strLimit(value) {
|
|
|
+ let maxLength = this.strMaxLen
|
|
|
+ if (!value || !maxLength) return value
|
|
|
+ return value.length > maxLength ? value.slice(0, maxLength - 1) + '...' : value
|
|
|
+ },
|
|
|
+ // 检查本地缓存中是否存在转盘图
|
|
|
+ checkCacheImg () {
|
|
|
+ console.log('检查本地缓存中是否存在转盘图')
|
|
|
+ // 检查是否已有缓存的转盘图
|
|
|
+ // 检查是否与本次奖品数据相同
|
|
|
+ this.oldLotteryImg = getStore('lotteryImg')
|
|
|
+ let oldPrizeList = getStore('prizeList')
|
|
|
+ let newPrizeList = JSON.stringify(this.prizeList)
|
|
|
+ if (this.oldLotteryImg) {
|
|
|
+ if (oldPrizeList === newPrizeList) {
|
|
|
+ console.log(`经查,本地缓存中存在转盘图 => ${this.oldLotteryImg}`)
|
|
|
+ this.isCacheImg = true
|
|
|
+
|
|
|
+ console.log('需要继续判断这张缓存图是否可用')
|
|
|
+ this.handlePrizeImg({
|
|
|
+ ok: true,
|
|
|
+ data: this.oldLotteryImg,
|
|
|
+ msg: '画布导出生成图片成功'
|
|
|
+ })
|
|
|
+ return
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ console.log('经查,本地缓存中不存在转盘图')
|
|
|
+ this.initCanvasDraw()
|
|
|
+ },
|
|
|
+ // 初始化绘制
|
|
|
+ initCanvasDraw () {
|
|
|
+ console.log('开始初始化转盘绘制')
|
|
|
+ this.isCacheImg = false
|
|
|
+ this.lotteryImg = ''
|
|
|
+ clearStore('lotteryImg')
|
|
|
+ setStore('prizeList', this.prizeList)
|
|
|
+ this.onCreateCanvas()
|
|
|
+ }
|
|
|
+ },
|
|
|
+ mounted() {
|
|
|
+ this.$nextTick(() => {
|
|
|
+ let stoTimer = setTimeout(() => {
|
|
|
+ clearTimeout(stoTimer)
|
|
|
+ stoTimer = null
|
|
|
+
|
|
|
+ if (this.canvasCached) {
|
|
|
+ this.checkCacheImg()
|
|
|
+ } else {
|
|
|
+ this.onCreateCanvas()
|
|
|
+ }
|
|
|
+ this.transitionDuration = this.duration
|
|
|
+ }, 50)
|
|
|
+ })
|
|
|
+ }
|
|
|
+ }
|
|
|
+</script>
|
|
|
+
|
|
|
+<style lang="scss" scoped>
|
|
|
+ $lotteryBgUrl: '~static/almost-lottery/almost-lottery__bg';
|
|
|
+ $actionBgUrl: '~static/almost-lottery/almost-lottery__action';
|
|
|
+
|
|
|
+ .almost-lottery {
|
|
|
+ display: flex;
|
|
|
+ justify-content: center;
|
|
|
+ align-items: center;
|
|
|
+ margin: 0 auto;
|
|
|
+ background-repeat: no-repeat;
|
|
|
+ background-position: center center;
|
|
|
+ background-size: contain;
|
|
|
+ background-image: url($lotteryBgUrl + ".png");
|
|
|
+
|
|
|
+ @media (-webkit-min-device-pixel-ratio: 2), (min-device-pixel-ratio: 2) {
|
|
|
+ background-image: url($lotteryBgUrl + "2x.png");
|
|
|
+ }
|
|
|
+
|
|
|
+ @media (-webkit-min-device-pixel-ratio: 3), (min-device-pixel-ratio: 3) {
|
|
|
+ background-image: url($lotteryBgUrl + "3x.png");
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ .almost-lottery__wrap {
|
|
|
+ position: relative;
|
|
|
+ display: flex;
|
|
|
+ justify-content: center;
|
|
|
+ align-items: center;
|
|
|
+ }
|
|
|
+
|
|
|
+ .almost-lottery__canvas {
|
|
|
+ position: absolute;
|
|
|
+ left: -9999px;
|
|
|
+ opacity: 0;
|
|
|
+ display: flex;
|
|
|
+ justify-content: center;
|
|
|
+ align-items: center;
|
|
|
+ }
|
|
|
+
|
|
|
+ .almost-lottery__action {
|
|
|
+ position: absolute;
|
|
|
+ background-repeat: no-repeat;
|
|
|
+ background-position: center center;
|
|
|
+ background-size: contain;
|
|
|
+ background-image: url($actionBgUrl + ".png");
|
|
|
+
|
|
|
+ @media (-webkit-min-device-pixel-ratio: 2), (min-device-pixel-ratio: 2) {
|
|
|
+ background-image: url($actionBgUrl + "2x.png");
|
|
|
+ }
|
|
|
+
|
|
|
+ @media (-webkit-min-device-pixel-ratio: 3), (min-device-pixel-ratio: 3) {
|
|
|
+ background-image: url($actionBgUrl + "3x.png");
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ .almost-lottery__measureText {
|
|
|
+ position: absolute;
|
|
|
+ left: 0;
|
|
|
+ top: 0;
|
|
|
+ white-space: nowrap;
|
|
|
+ font-size: 12px;
|
|
|
+ opacity: 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ .canvas-img {
|
|
|
+ display: block;
|
|
|
+ transition: transform cubic-bezier(.34, .12, .05, .95);
|
|
|
+ }
|
|
|
+</style>
|