422 lines
11 KiB
Vue
422 lines
11 KiB
Vue
<!--
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* @Description: 生成海报组件
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* @Version: 1.0.0
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* @Autor: hch
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* @Date: 2020-08-07 14:48:41
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* @LastEditors: Please set LastEditors
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* @LastEditTime: 2021-07-31 18:11:35
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* 保存海报按钮和关闭按钮 在html代码中写出来 绑定点击方法然后透明 再用canvas 覆盖
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-->
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<template>
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<view
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class="canvas-content"
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v-show="canvasShow"
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:style="'width:' + system.w + 'px; height:' + system.h + 'px;'"
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>
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<!-- 遮罩层 -->
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<view class="canvas-mask"></view>
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<!-- 海报 -->
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<!-- :width="system.w" :height="system.h" 支付宝必须要这样设置宽高才有效果 -->
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<canvas
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class="canvas"
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canvas-id="myCanvas"
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id="myCanvas"
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:style="'width:' + system.w + 'px; height:' + system.h + 'px;'"
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:width="system.w"
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:height="system.h"
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></canvas>
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<view class="button-wrapper">
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<!-- 保存海报按钮 -->
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<!-- #ifndef MP-QQ -->
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<!-- cover-view 标签qq小程序有问题 -->
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<view class="save-btn" @tap="handleSaveCanvasImage">保存海报</view>
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<view class="save-btn cancel-btn" @tap="handleCanvasCancel">取消</view>
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<!-- #endif -->
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<!-- #ifdef MP-QQ -->
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<view class="save-btn" @tap="handleSaveCanvasImage">保存海报</view>
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<view class="save-btn cancel-btn" @tap="handleCanvasCancel">取消</view>
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<!-- #endif -->
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</view>
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</view>
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</template>
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<script>
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import { drawSquarePic, drawTextReturnH, getSystem } from './utils'
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export default {
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data() {
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return {
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system: {},
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canvasShow: false
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}
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},
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props: {
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posterData: {
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type: Object,
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default: () => {
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return {}
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}
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}
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},
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computed: {
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/**
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* @description: 计算海报背景数据
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* @param {*}
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* @return {*}
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* @author: hch
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*/
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poster() {
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let data = this.posterData
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let system = this.system
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let posterBg = {
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url: data.poster.url,
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r: data.poster.r * system.scale,
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w: data.poster.w * system.scale,
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h: data.poster.h * system.scale,
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x: (system.w - data.poster.w * system.scale) / 2,
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y: (system.h - data.poster.h * system.scale) / 2,
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p: data.poster.p * system.scale
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}
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return posterBg
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},
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/**
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* @description: 计算海报头部主图
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* @param {*}
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* @return {*}
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* @author: hch
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*/
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mainImg() {
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let data = this.posterData
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let system = this.system
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let posterMain = {
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url: data.mainImg.url,
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r: data.mainImg.r * system.scale,
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w: data.mainImg.w * system.scale,
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h: data.mainImg.h * system.scale,
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x: (system.w - data.mainImg.w * system.scale) / 2,
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y: this.poster.y + data.poster.p * system.scale
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}
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return posterMain
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},
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/**
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* @description: 计算海报标题
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* @param {*}
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* @return {*}
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* @author: hch
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*/
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title() {
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let data = this.posterData
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let system = this.system
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let posterTitle = data.title
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posterTitle.x = this.mainImg.x
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posterTitle.y = this.mainImg.y + this.mainImg.h + data.title.mt * system.scale
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return posterTitle
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},
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/**
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* @description: 计算小程序码
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* @param {*}
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* @return {*}
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* @author: hch
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*/
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codeImg() {
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let data = this.posterData
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let system = this.system
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let posterCode = {
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url: data.codeImg.url,
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r: data.codeImg.r * system.scale,
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w: data.codeImg.w * system.scale,
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h: data.codeImg.h * system.scale,
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x: this.mainImg.x,
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y: data.codeImg.mt * system.scale //y需要加上绘图后文本的y
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}
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return posterCode
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}
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},
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created() {
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// 获取设备信息
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this.system = getSystem()
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},
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methods: {
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/**
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* @description: 展示海报
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* @param {type}
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* @return {type}
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* @author: hch
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*/
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posterShow() {
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console.log("海报生成软件获取到数据为",this.posterData)
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this.canvasShow = true
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this.creatPoster()
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},
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/**
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* @description: 生成海报
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* @author: hch
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*/
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async creatPoster() {
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uni.showLoading({
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title: '生成海报中...'
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})
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const ctx = uni.createCanvasContext('myCanvas', this)
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this.ctx = ctx
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ctx.clearRect(0, 0, this.system.w, this.system.h) //清空之前的海报
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ctx.draw() //清空之前的海报
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// 根据设备屏幕大小和距离屏幕上下左右距离，及圆角绘制背景
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let poster = this.poster
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let mainImg = this.mainImg
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let codeImg = this.codeImg
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let title = this.title
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console.log("生成海报之前获取的数据为",mainImg)
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await drawSquarePic(ctx, poster.x, poster.y, poster.w, poster.h, poster.r, poster.url)
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await drawSquarePic(ctx, mainImg.x, mainImg.y, mainImg.w, mainImg.h, mainImg.r, mainImg.url)
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// 绘制标题 textY 绘制文本的y位置
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console.log('creatPoster -> title.x', title.x)
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let textY = drawTextReturnH(
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ctx,
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title.text,
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title.x,
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title.y,
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mainImg.w,
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title.fontSize,
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title.color,
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title.lineHeight,
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title.textAlign
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)
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console.log("绘制小程序码codeImg",codeImg)
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// 绘制小程序码
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await drawSquarePic(
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ctx,
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codeImg.x,
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codeImg.y + textY,
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codeImg.w,
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codeImg.h,
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codeImg.r,
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codeImg.url
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)
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// 小程序的名称
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// 长按/扫描识别查看商品
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let y = 0
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let x = codeImg.x + codeImg.w + 90
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this.posterData.tips.forEach((element, i) => {
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if (i == 0) {
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y = codeImg.y + textY + codeImg.h/2 - 12
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} else {
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y += element.mt
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}
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y = drawTextReturnH(
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ctx,
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element.text,
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x,
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y,
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mainImg.w,
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element.fontSize,
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element.color,
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element.lineHeight,
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element.align
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)
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})
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uni.hideLoading()
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},
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/**
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* @description: 保存到系统相册
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* @param {type}
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* @return {type}
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* @author: hch
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*/
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handleSaveCanvasImage() {
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uni.showLoading({
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title: '保存中...'
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})
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let _this = this
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// 把画布转化成临时文件
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// #ifndef MP-ALIPAY
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// 支付宝小程序外，其他都是用这个方法 canvasToTempFilePath
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uni.canvasToTempFilePath(
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{
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x: this.poster.x,
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y: this.poster.y,
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width: this.poster.w, // 画布的宽
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height: this.poster.h, // 画布的高
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destWidth: this.poster.w * 5,
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destHeight: this.poster.h * 5,
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canvasId: 'myCanvas',
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success(res) {
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//保存图片至相册
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// #ifndef H5
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// 除了h5以外的其他端
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uni.saveImageToPhotosAlbum({
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filePath: res.tempFilePath,
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success(res) {
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uni.hideLoading()
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uni.showToast({
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title: '图片保存成功，可以去分享啦~',
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duration: 2000,
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icon: 'none'
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})
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_this.handleCanvasCancel()
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},
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fail() {
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uni.showToast({
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title: '保存失败，稍后再试',
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duration: 2000,
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icon: 'none'
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})
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uni.hideLoading()
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}
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})
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// #endif
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// #ifdef H5
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// h5的时候
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uni.showToast({
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title: '请长按保存',
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duration: 3000,
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icon: 'none'
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})
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_this.handleCanvasCancel()
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_this.$emit('previewImage', res.tempFilePath)
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// #endif
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},
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fail(res) {
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console.log('fail -> res', res)
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uni.showToast({
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title: '保存失败，稍后再试',
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duration: 2000,
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icon: 'none'
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})
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uni.hideLoading()
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}
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},
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this
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)
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// #endif
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// #ifdef MP-ALIPAY
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// 支付宝小程序条件下 toTempFilePath
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this.ctx.toTempFilePath(
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{
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x: this.poster.x,
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y: this.poster.y,
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width: this.poster.w, // 画布的宽
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height: this.poster.h, // 画布的高
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destWidth: this.poster.w * 5,
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destHeight: this.poster.h * 5,
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success(res) {
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//保存图片至相册
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my.saveImage({
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url: res.apFilePath,
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showActionSheet: true,
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success(res) {
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uni.hideLoading()
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uni.showToast({
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title: '图片保存成功，可以去分享啦~',
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duration: 2000,
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icon: 'none'
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})
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_this.handleCanvasCancel()
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},
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fail() {
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uni.showToast({
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title: '保存失败，稍后再试',
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duration: 2000,
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icon: 'none'
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})
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uni.hideLoading()
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}
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})
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},
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fail(res) {
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console.log('fail -> res', res)
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uni.showToast({
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title: '保存失败，稍后再试',
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duration: 2000,
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icon: 'none'
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})
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uni.hideLoading()
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}
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},
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this
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)
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// #endif
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},
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/**
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* @description: 取消海报
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* @param {type}
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* @return {type}
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* @author: hch
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*/
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handleCanvasCancel() {
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this.canvasShow = false
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this.$emit('cancel', true)
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}
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}
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}
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</script>
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<style lang="scss">
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.content {
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height: 100%;
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text-align: center;
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}
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.canvas-content {
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position: absolute;
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top: 0;
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.canvas-mask {
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position: fixed;
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top: 0;
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right: 0;
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bottom: 0;
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left: 0;
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z-index: 998;
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width: 100%;
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height: 100%;
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background: rgba(0, 0, 0, 0.5);
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}
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.canvas {
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z-index: 999;
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}
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.button-wrapper {
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position: fixed;
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bottom: 20rpx;
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z-index: 999;
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display: flex;
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width: 100%;
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height: 72rpx;
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justify-content: space-around;
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}
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.save-btn {
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z-index: 1000;
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width: 40%;
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height: 100%;
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font-size: 30rpx;
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line-height: 72rpx;
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color: #fff;
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text-align: center;
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background: $uni-btn-color;
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border-radius: 45rpx;
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border-radius: 36rpx;
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}
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.cancel-btn {
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color: $uni-btn-color;
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background: #fff;
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}
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.canvas-close-btn {
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position: fixed;
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top: 30rpx;
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right: 0;
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z-index: 1000;
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width: 60rpx;
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height: 60rpx;
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padding: 20rpx;
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}
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}
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</style>
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