主要是使用到canvas画布的知识
代码如下：
wxml
<view>
<image src="{{img}}" class='bgImg'></image>
<text class='mine'>我的邀请码</text>
<text class='code'>{{code}}</text>
<text class='who'>谁邀请你一起吃面?</text>
<view class='inputBox'>
<input placeholder='输入朋友的验证码' class='input' bindinput='bindKeyInput'/>
<button bindtap='btnclick' class='btn'>提交</button>
</view>
<text class='tishi'>输入朋友的邀请码，朋友和你各自获得通用优惠券1张</text>
<text class='shareText'>生成海报分享至</text>
<view class='imgBox'>
<button open-type="share" class='zfbtn'><image src="{{wechat}}" class='img'></image></button>
<button class='zfbtn m_l' bindtap='formSubmit'><image src="{{quan}}" class='img'></image></button>
</view>
<!--生成海报 -->
<!-- <view class="img-box">
</view> -->
<view class='imagePathBox' hidden="{{maskHidden == false}}">
<image src="{{imagePath}}" class='shengcheng'></image>
<button class='baocun' bindtap='baocun'>保存相册，分享到朋友圈</button>
</view>
<view hidden="{{maskHidden == false}}" class="mask"></view>
<view class="canvas-box">
<canvas style=" 375px;height: 667px;position:fixed;top:9999px" canvas-id="mycanvas"/>
</view>
</view>
wxss
.bgImg{
display: block;
100%;
height: 366rpx;
}
.mine{
display: block;
text-align: center;
color: #333;
margin-top: 44rpx;
}
.code{
display: block;
text-align: center;
color: #333;
font-size: 76rpx;
font-weight: bold;
margin-top: 30rpx;
}
.who{
display: block;
margin-top: 80rpx;
font-size: 32rpx;
color: #333;
text-align: center;
}
.inputBox{
text-align: center;
margin-top: 44rpx;
}
.input{
text-align: center;
440rpx;
height: 88rpx;
border-radius: 44rpx;
background: #f5f5f5;
font-size: 32rpx;
display: inline-block;
}
.btn{
160rpx;
height: 88rpx;
border-radius: 44rpx;
background:linear-gradient(90deg,rgba(255,226,0,1),rgba(255,200,11,1));
box-shadow: 0px 4px 8px 0px rgba(255,200,11,0.5);
color:#333;
font-size: 32rpx;
display: inline-block;
line-height: 88rpx;
margin-left: 40rpx;
}
button[class="btn"]::after {
border: 0;
}
.tishi{
display: block;
text-align: center;
color: #999;
margin-top: 30rpx;
}
.shareText{
display: block;
text-align: center;
color: #333;
font-size: 28rpx;
margin-top: 100rpx;
}
.imgBox{
text-align: center;
100%;
margin-top:60rpx;
padding-bottom: 120rpx;
}
.img{
display: inline-block;
100%;
height: 100%;
}
.m_l{
margin-left: 180rpx;
}
.zfbtn{
display: inline-block;
120rpx;
height: 120rpx;
border-radius: 50%;
background: transparent;
outline: none;
border: 0;
padding: 0;
}
button[class="zfbtn"]::after {
border: 0;
}
button[class="zfbtn m_l"]::after {
border: 0;
}
.imagePathBox{
100%;
height: 100%;
background: rgba(0,0,0,0.7);
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
z-index: 10;
}
.shengcheng{
80%;
height: 80%;
position: fixed;
top: 50rpx;
left: 50%;
margin-left: -40%;
z-index: 10;
}
.baocun{
display: block;
80%;
height: 80rpx;
padding: 0;
line-height: 80rpx;
text-align: center;
position: fixed;
bottom: 50rpx;
left: 10%;
background: #ffe200;
color: #333;
font-size: 32rpx;
border-radius: 44rpx;
}
button[class="baocun"]::after{
border: 0;
}
js
// pages/prize/prize.js
const app = getApp()
Page({
/**
* 页面的初始数据
*/
data: {
img:"../../images/gobg.png",
wechat:"../../images/wechat.png",
quan:"../../images/quan.png",
code:"E7AI98",
inputValue:"",
maskHidden: false,
name:"",
touxiang:"",
code: "E7A93C"
},
//获取输入框的值
bindKeyInput:function(e){
this.setData({
inputValue: e.detail.value
})
},
//点击提交按钮
btnclick:function(){
var text = this.data.inputValue
wx.showToast({
title: text,
icon: 'none',
duration: 2000
})
},
/**
* 生命周期函数--监听页面加载
*/
onLoad: function (options) {
var that = this;
wx.getUserInfo({
success: res => {
console.log(res.userInfo,"huoqudao le ")
this.setData({
name: res.userInfo.nickName,
})
wx.downloadFile({
url: res.userInfo.avatarUrl, //仅为示例，并非真实的资源
success: function (res) {
// 只要服务器有响应数据，就会把响应内容写入文件并进入 success 回调，业务需要自行判断是否下载到了想要的内容
if (res.statusCode === 200) {
console.log(res, "reererererer")
that.setData({
touxiang: res.tempFilePath
})
}
}
})
}
})
},
//将canvas转换为图片保存到本地，然后将图片路径传给image图片的src
createNewImg: function () {
var that = this;
var context = wx.createCanvasContext('mycanvas');
context.setFillStyle("#ffe200")
context.fillRect(0, 0, 375, 667)
var path = "/images/gobg.png";
//将模板图片绘制到canvas,在开发工具中drawImage()函数有问题，不显示图片
//不知道是什么原因，手机环境能正常显示
context.drawImage(path, 0, 0, 375, 183);
var path1 = that.data.touxiang;
console.log(path1,"path1")
//将模板图片绘制到canvas,在开发工具中drawImage()函数有问题，不显示图片
var path2 = "/images/txquan.png";
var path3 = "/images/heise.png";
var path4 = "/images/wenziBg.png";
var path5 = "/images/wenxin.png";
context.drawImage(path2, 126, 186, 120, 120);
//不知道是什么原因，手机环境能正常显示
// context.save(); // 保存当前context的状态
var name = that.data.name;
//绘制名字
context.setFontSize(24);
context.setFillStyle('#333333');
context.setTextAlign('center');
context.fillText(name, 185, 340);
context.stroke();
//绘制一起吃面标语
context.setFontSize(14);
context.setFillStyle('#333333');
context.setTextAlign('center');
context.fillText("邀请你一起去吃面", 185, 370);
context.stroke();
//绘制验证码背景
context.drawImage(path3, 48, 390, 280, 84);
//绘制code码
context.setFontSize(40);
context.setFillStyle('#ffe200');
context.setTextAlign('center');
context.fillText(that.data.code, 185, 435);
context.stroke();
//绘制左下角文字背景图
context.drawImage(path4, 25, 520, 184, 82);
context.setFontSize(12);
context.setFillStyle('#333');
context.setTextAlign('left');
context.fillText("进入小程序输入朋友的邀请", 35, 540);
context.stroke();
context.setFontSize(12);
context.setFillStyle('#333');
context.setTextAlign('left');
context.fillText("码，朋友和你各自获得通用", 35, 560);
context.stroke();
context.setFontSize(12);
context.setFillStyle('#333');
context.setTextAlign('left');
context.fillText("优惠券1张哦~", 35, 580);
context.stroke();
//绘制右下角扫码提示语
context.drawImage(path5, 248, 578, 90, 25);
//绘制头像
context.arc(186, 246, 50, 0, 2 * Math.PI) //画出圆
context.strokeStyle = "#ffe200";
context.clip(); //裁剪上面的圆形
context.drawImage(path1, 136, 196, 100, 100); // 在刚刚裁剪的园上画图
context.draw();
//将生成好的图片保存到本地，需要延迟一会，绘制期间耗时
setTimeout(function () {
wx.canvasToTempFilePath({
canvasId: 'mycanvas',
success: function (res) {
var tempFilePath = res.tempFilePath;
that.setData({
imagePath: tempFilePath,
canvasHidden:true
});
},
fail: function (res) {
console.log(res);
}
});
}, 200);
},
//点击保存到相册
baocun:function(){
var that = this
wx.saveImageToPhotosAlbum({
filePath: that.data.imagePath,
success(res) {
wx.showModal({
content: '图片已保存到相册，赶紧晒一下吧~',
showCancel: false,
confirmText: '好的',
confirmColor: '#333',
success: function (res) {
if (res.confirm) {
console.log('用户点击确定');
/* 该隐藏的隐藏 */
that.setData({
maskHidden: false
})
}
},fail:function(res){
console.log(11111)
}
})
}
})
},
//点击生成
formSubmit: function (e) {
var that = this;
this.setData({
maskHidden: false
});
wx.showToast({
title: '装逼中...',
icon: 'loading',
duration: 1000
});
setTimeout(function () {
wx.hideToast()
that.createNewImg();
that.setData({
maskHidden: true
});
}, 1000)
},
/**
* 生命周期函数--监听页面初次渲染完成
*/
onReady: function () {
},
/**
* 生命周期函数--监听页面显示
*/
onShow: function () {
var that = this;
wx.getUserInfo({
success: res => {
console.log(res.userInfo, "huoqudao le ")
this.setData({
name: res.userInfo.nickName,
})
wx.downloadFile({
url: res.userInfo.avatarUrl, //仅为示例，并非真实的资源
success: function (res) {
// 只要服务器有响应数据，就会把响应内容写入文件并进入 success 回调，业务需要自行判断是否下载到了想要的内容
if (res.statusCode === 200) {
console.log(res, "reererererer")
that.setData({
touxiang: res.tempFilePath
})
}
}
})
}
})
},
/**
* 生命周期函数--监听页面隐藏
*/
onHide: function () {
},
/**
* 生命周期函数--监听页面卸载
*/
onUnload: function () {
},
/**
* 页面相关事件处理函数--监听用户下拉动作
*/
onPullDownRefresh: function () {
},
/**
* 页面上拉触底事件的处理函数
*/
onReachBottom: function () {
},
/**
* 用户点击右上角分享
*/
onShareAppMessage: function (res) {
return {
title:"这个是我分享出来的东西",
success:function(res){
console.log(res,"转发成功")
},
fail:function(res){
console.log(res,"转发失败")
}
}
}
})