<template>
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<view class="h100">
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<view style="text-align: center;padding-bottom: 150px;">
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<image :src="image" v-if="image" style="width: 200px;height: 200px;border: 1px solid #ccc;"></image>
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<image :src="imgs" v-else style="width: 200px;height: 200px;border: 1px solid #ccc;"></image>
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<view class="but" style="margin: 0 25px;" @click="toPop">我要在上面签字</view>
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<jp-signature-popup ref="signature2" @change="setImg" popup />
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<canvas canvas-id="shareCanvas" class="canvas" bindlongpress="saveImg" catchtouchmove="true"
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style="position:fixed;left:500%"
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:style="{height: canvasHeight+'px',width:canvasWidth+'px'}">
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</canvas>
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</view>
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</view>
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</template>
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<!-- 有项目需要开发的请联系 扣 - 371524845 -->
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<!--
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注意：需要采用线上图片且需要配置白名单，未配置手机无法签名，采用真机调试2.0不配置白名单也可以签名，正式版本需要线上图片且需要配置白名单
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-->
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<script>
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export default {
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data() {
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return {
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canvasHeight: 400,
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canvasWidth: 400,
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width:80,
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height: 50,
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left: 20,
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top: 20,
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ctx:null,
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image: '',
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imgs: 'http://mmbiz.qpic.cn/sz_mmbiz_jpg/GEWVeJPFkSGTfkSpSbg9cHUqcibBv38r8GXDIVy4W6FN7a1TMWf6RSNQLemKBwG8VqjlxUhicIzz3NTONVrD96ibg/0?wx_fmt=jpeg'
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}
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},
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mounted() {
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//初始化画布
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this.ctx = wx.createCanvasContext('shareCanvas', this)
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},
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methods: {
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setImg(val) {
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if (val) {
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this.exportPost(val).then(res => {
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this.image = res
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})
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}
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},
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toPop() {
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this.$refs.signature2.toPop()
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},
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getImageInfo(src) {
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return new Promise((resolve, reject) => {
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wx.getImageInfo({
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src,
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success: (res) => resolve(res),
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fail: (res) => reject(res)
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})
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});
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},
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exportPost(image2){
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let that = this
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return new Promise(function (resolve, reject) {
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let image = that.imgs
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//获取系统的基本信息，为后期的画布和底图适配宽高
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uni.getSystemInfo({
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success: function (res) {
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Promise.all([that.getImageInfo(image),that.getImageInfo(image2)]).then(res=>{
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//获取底图和二维码图片的基本信息,通常前端导出的二维码是base64格式的，所以要转成图片格式的才可以获取图片的基本信息
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that.ctx.drawImage(res[0].path,0 , 0,that.canvasWidth,that.canvasHeight);
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that.ctx.drawImage(res[1].path,that.left,that.top,that.width, that.height);
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that.ctx.draw(false,function(){
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wx.canvasToTempFilePath({
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x: 0,
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y: 0,
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width:that.canvasWidth,
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height:that.canvasHeight,
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destWidth:that.canvasWidth*2,//这里乘以2是为了保证合成图片的清晰度
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destHeight:that.canvasHeight*2,
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canvasId: 'shareCanvas',
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fileType:'jpg',//设置导出图片的后缀名
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success: function (res) {
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resolve(res.tempFilePath)
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},
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fail: function (res) {
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reject(res)
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},
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})
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});
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})
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}
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})
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})
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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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.but {
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margin: 25px;
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line-height: 40px;
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text-align: center;
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background-color: #55aaff;
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color: #fff;
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}
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.sssv {
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height: 1150px;
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}
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</style>
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