使用canvas生成海报
wxml
<view>
<canvas class="canvas" style="width: {{canvas_width}}px;height:{{canvas_height}}px;" canvas-id="mycanvas"></canvas>
<view class="pop">
<view class="popbg" bindtap="getclose"></view>
<view class="popup">
<view class="poster">
<image src="{{canvas}}"></image>
</view>
<view class="save">
<view class="down">
<image mode="widthFix" src="https://sucai.suoluomei.cn/sucai_zs/images/20200110105821-1.png">
</image>
</view>
<view bindtap="getsave">保存图片</view>
</view>
</view>
</view>
</view>
wxss
.popbg {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.5);
z-index: 10;
}
.popup {
position: fixed;
top: 10%;
left: 50%;
transform: translate(-50%);
z-index: 100;
}
.poster {
width: 700rpx;
height: 900rpx;
background: #fff;
border-radius: 30rpx;
overflow: hidden;
}
.save {
margin: 40rpx auto 0;
width: 340rpx;
height: 70rpx;
background: #0C6D4A;
border-radius: 10rpx;
display: flex;
align-items: center;
justify-content: center;
}
.down {
width: 50rpx;
display: flex;
align-items: center;
justify-content: center;
}
.save view:nth-child(2) {
color: #fff;
font-size: 28rpx;
margin-left: 20rpx;
}
.canvas {
position: absolute;
top: -9999rpx;
left: 0;
}
image {
width: 100%;
height: 100%;
}
js
data: {
canvas: '',
canvas_width: 700,
canvas_height: 900,
main: "https://sucai.suoluomei.cn/sucai_zs/images/20191209160052-2.png",
logo: "https://sucai.suoluomei.cn/sucai_zs/images/20190919150508-logo.png",
explain: "长按识别或保存图片",
code: "http://sucai.suoluomei.cn/sucai_zs/images/20200526093044-%E5%BE%AE%E4%BF%A1%E5%9B%BE%E7%89%87_20200526093016.png",
},
onLoad: function (options) {
var logo = this.data.logo
var main = this.data.main
var explain = this.data.explain
var code = this.data.code
this.getcanvas(logo, main, explain, code)
},
// 获取海报 画布设置宽700 高800
// 以此传入图标，主体图片，标题文字，小程序二维码
getcanvas(logo, main, explain, code) {
wx.showLoading({
title: '加载中',
})
// 主图所需
let primary = ""
let primary_width = ""
let primary_height = ""
// logo所需
let mark = ""
let mark_width = ""
let mark_height = ""
// 小程序码所需
let yard = ""
let yard_width = ""
let yard_height = ""
// 用户头像
let portrait = ""
let portrait_width = ""
let portrait_height = ""
return new Promise((resolve, reject) => {
// 海报主要图
wx.getImageInfo({
src: main,
success: (res) => {
primary = res.path
primary_width = res.width
primary_height = res.height
if (res.errMsg == "getImageInfo:ok") {
// 海报水印logo
wx.getImageInfo({
src: logo,
success: (res) => {
mark = res.path
mark_width = res.width
mark_height = res.height
if (res.errMsg == "getImageInfo:ok") {
// 小程序码
wx.getImageInfo({
src: code,
success: (res) => {
yard = res.path
yard_width = res.width / 2
yard_height = res.height / 2
if (res.errMsg == "getImageInfo:ok") {
// 用户头像
wx.getUserInfo({
success: function (res) {
wx.getImageInfo({
src: res.userInfo.avatarUrl,
success: (res) => {
portrait = res.path
portrait_width = res.width
portrait_height = res.height
resolve(res)
}
})
}
})
}
},
})
}
},
})
}
},
})
})
.then(res => {
let ctx = wx.createCanvasContext('mycanvas')
// 填充背景颜色
ctx.rect(0, 0, this.data.canvas_width, this.data.canvas_height)
ctx.setFillStyle('#fff')
ctx.fill()
// 用户头像
ctx.save()
ctx.beginPath()
ctx.arc(75, 75, 45, 0, Math.PI * 2, false);
ctx.stroke()
ctx.clip();
ctx.drawImage(portrait, 30, 30, 90, 90) //145为arc的90加110除以2
ctx.restore()
// 用户昵称
ctx.setFontSize(28)
ctx.setFillStyle('#000')
ctx.fillText('倘若', mark_width + 50, mark_height + 30)
// logo图片
ctx.drawImage(mark, this.data.canvas_width - mark_width - 30, 30, mark_width, mark_height)
// 主体图片
ctx.drawImage(primary, this.data.canvas_width / 2 - primary_width / 2.4, 140, primary_width / 1.2, primary_height / 1.2)
// 详情
ctx.setFontSize(24)
ctx.setTextAlign('center')
ctx.setFillStyle('#666')
ctx.fillText('你的好友分享给你的小程序', this.data.canvas_width / 2, 500)
ctx.fillText(explain, this.data.canvas_width / 2, 550)
// 小程序二维码
ctx.drawImage(yard, this.data.canvas_width / 2 - yard_width / 2.4, 600, yard_width / 1.2, yard_height / 1.2)
ctx.draw(true, setTimeout(() => {
wx.canvasToTempFilePath({
canvasId: 'mycanvas',
success: (res) => {
wx.hideLoading()
console.log(res.tempFilePath)
this.setData({
canvas: res.tempFilePath
})
},
}, this)
}, 500))
})
},
// 保存为图片
getsave() {
wx.getSetting({ //询问用户是否保存相册到本地
success: (set) => {
wx.saveImageToPhotosAlbum({
filePath: this.data.canvas,
success: (res) => {
if (res.errMsg == "saveImageToPhotosAlbum:ok") {
wx.showToast({
title: '保存成功',
});
this.setData({
show: 0
})
}
}
})
//拒绝保存到本地的处理机制
if (set.authSetting['scope.writePhotosAlbum'] == false) {
wx.openSetting({
success(set) {
console.log(set)
}
})
}
}
})
},
