效果如图
image.png
既然需要头像,就需要在开发设置下downloadFile合法域名配上头像的域名
image.png
最重要的一点,原来一直好使的,突然间生成不了海报了,在canvasToTempFilePath这步报错fail no image,终于找到原因:canvas不能hidden,也就是不能display:none,所以下面对canvas的样式做了调整。
html
<button open-type="getUserInfo" lang="zh_CN" bindgetuserinfo="shares">晒到朋友圈</button>
<view class="zhezao" hidden="{{hidden}}">
<canvas canvas-id="shareImg" style="width:1080px;height:1920px;display:block;position:absolute;top:0px;left:-1080px;"></canvas>
<view class="t_w">
<view class="roca_canvas">
<image src="{{prurl}}"></image>
</view>
<view class="save_img" hover-class="liangdu" bindtap="saveImg">保存到图库</view>
<view class="close_img" hover-class="liangdu" bindtap="closeImg"><image src="/img/stepPage_closeWindow.png"></image></view>
</view>
</view>
js
data: {
...
hidden: true,//控制弹窗显示
userImg:'',//用户的头像
prurl:'',
bgImg:'',//背景图
},
shares: function (info) {
var that = this
if(info.detail.userInfo){
that.setData({
userImg:info.detail.userInfo.avatarUrl
})
that.setData({
hidden: false
})
if(that.data.prurl==''){
wx.showLoading({
title: '努力生成中...',
})
that.canvas();
}
if(that.data.prurl!='')
wx.showToast({
title: '努力生成中...',
icon:'loading',
duration: 200
})
}
},
canvas:function(){
var that = this
let promise1 = new Promise(function (resolve, reject) {
wx.getImageInfo({
src: '../../resources/img/stepPage_poster.png',
success: function (res) {
that.setData({
bgImg:res.path
})
resolve(res);
}
})
});
var path3 = that.data.userImg;
let promise3 = new Promise(function (resolve, reject) {
wx.getImageInfo({
src: path3,
success: function (res) {
that.setData({
bdcode3:res.path
})
resolve(res);
}
})
});
Promise.all([
promise1,promise3
]).then(res => {
const ctx = wx.createCanvasContext('shareImg')
ctx.setFillStyle('white');
ctx.fillRect(0, 0, 1080, 1920);
ctx.stroke();
//主要就是计算好各个图文的位置
ctx.drawImage('/'+that.data.bgImg, 0, 0, 1080, 1920);//背景图
//白字
ctx.setFillStyle('#ffffff');
ctx.setTextAlign('center');
ctx.font = 'normal normal 130px Bebas Neue Book';
ctx.fillText(that.data.all_num, 1080 / 2, 1050)
//黑字
ctx.setFillStyle("#000000")
ctx.setTextAlign('center')
ctx.font = 'normal normal 48px Bebas Neue';
ctx.fillText(that.data.now, 1080 / 2, 1170)
ctx.fill()
ctx.stroke()
//头像
ctx.beginPath()
ctx.arc(540, 520, 130, 0, Math.PI * 2,false);
ctx.setStrokeStyle('#ffffff') //设置边的
ctx.clip();
ctx.drawImage(that.data.bdcode3, 410, 390, 260, 260)
ctx.closePath()
ctx.stroke()
ctx.draw(true,function(){
that.canvasTo()
})
})
},
canvasTo:function(){
var that = this
wx.canvasToTempFilePath({
x: 0,
y: 0,
width: 1080,
height: 1920,
destWidth: 1080,
destHeight: 1920,
canvasId: 'shareImg',
success: function (res) {
that.setData({
prurl: res.tempFilePath,
})
wx.hideLoading()
},
fail: function (res) {
console.log(res)
}
})
},
//关闭弹层
closeImg:function(){
wx.hideLoading();
this.setData({
hidden: true
})
},
//保存到相册
saveImg: function () {
var self = this;
var e = this.data.prurl;
//保存到相册授权
app.getPhotosAlbum(self);
wx.saveImageToPhotosAlbum({
filePath:e,
success(res){
self.closeImg();
wx.showToast({
title: '保存成功',
icon: 'success',
duration: 2000
})
}
})
},
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