Born as a human who does not pay who do not work hard
Applets end've just got a new demand said to generate a poster users to save images to a local share, directly on the code word does not say
// pages/haibao/haibao.js
Page({
/**
* 页面的初始数据
*/
data: {
evalatImage:'',
bgBanner:'',
imagePath:"",
maskHidden:false,
qrcode_image:''
},
/**
* 生命周期函数--监听页面加载
*/
onLoad: function (options) {
},
/**
* 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.getImageInfo({
src: "https://m.xinjuenet.com/images/banner/b-xldh.jpg",
success(res) {
console.log("banner临时路径:" + res.path);
that.setData({
evalatImage: res.path
})
}
})
wx.getImageInfo({
src: "https://m.xinjuenet.com/images/banner/b-xldh.jpg",
success(res) {
console.log("海报底部背景:" + res.path);
that.setData({
bgBanner: res.path
})
}
})
that.qrcode_image();
wx.getImageInfo({
src: that.data.qrcode_image,
success(res) {
console.log("二维码:" + res.path);
that.setData({
qrcode_image: res.path
})
}
})
},
/**
* 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 () {
},
//点击生成海报
formSubmit: function (e) {
var that = this;
wx.showToast({
title: '海报生成中...',
icon: 'loading',
duration: 1000
});
that.createNewImg();
setTimeout(function () {
wx.hideToast()
that.setData({
maskHidden: true
});
}, 1000);
},
//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.clearRect(0, 0, 375, 660);
context.setFillStyle("#fff")
context.fillRect(0, 0, 375, 660)
context.save();
var path = that.data.evalatImage;
context.drawImage(path, 0, 0, 375, 183);
var path1 = that.data.bgBanner;
console.log("海报底部背景图" + path1);
var path2 = that.data.qrcode_image;
console.log("海报底部二维码" + path2);
context.setFontSize(16);
context.setFillStyle('#333');
context.setTextAlign('left');
context.fillText("测试结果", 60, 230);
context.stroke();
context.save();
var titl = "分享标题";
context.setFontSize(18);
context.setFillStyle('#333');
context.setTextAlign('left');
context.font = 'normal bold 18px sans-serif';
context.fillText(titl, 60, 270);
context.stroke();
context.save();
context.setFontSize(16);
context.setFillStyle('#333');
context.setTextAlign('left');
context.fillText("测试说明", 60, 320);
context.stroke();
context.save();
context.drawImage(path1, 0, 550, 375, 130);
var results = "分享的文本信息，布上下文 canvasID";
// 测试结果说明
that.dealWords({
ctx: context, //画布上下文 canvasID
fontSize: 16, //字体大小
word: results, //需要处理的文字
maxWidth: 270, //一行文字最大宽度
x: 60, //文字在x轴要显示的位置
y: 340, //文字在y轴要显示的位置
maxLine: 6 //文字最多显示的行数
});
context.stroke();
context.save(); //保存之前的画布设置
//绘制头像
context.beginPath();
context.arc(50, 225, 5, 0, 2 * Math.PI);
context.setStrokeStyle("#c7eddd");
context.setFillStyle("#44bf8c");
context.clip(); //裁剪上面的圆形
context.fill();//填充
context.restore();//因为clip是剪切了画布 则后面所有的操作都会限制在被裁减的区域内可见 用restore可以恢复之前的设置
context.closePath();
context.save(); //保存之前的画布设置
context.beginPath();
context.arc(50, 315, 5, 0, 2 * Math.PI);
context.setStrokeStyle("#c7eddd");
context.setFillStyle("#44bf8c");
context.clip(); //裁剪上面的圆形
context.fill();//填充
context.restore();
context.closePath();
context.save(); //保存之前的画布设置
context.beginPath();
context.arc(55, 610, 50, 0, 2 * Math.PI);
context.setStrokeStyle("#ffe200");
context.clip(); //裁剪上面的圆形
context.drawImage(path2, 5, 560, 100, 100);
context.restore();
context.closePath();
context.save(); //保存之前的画布设置
context.beginPath();
// context.setFontSize(16);
context.setFillStyle('#fff');
context.setTextBaseline("top");
context.setTextAlign('left');
// context.font = 'normal 18px arial';
// context.fillText("预防疫情四大宅家心理健康测评", 115, 565);
// context.fillText("预防疫情四大宅家心理健康测评", 115, 589);
that.dealWords({
ctx: context, //画布上下文 canvasID
fontSize: 16, //字体大小
word: titl, //需要处理的文字
maxWidth: 240, //一行文字最大宽度
x: 115, //文字在x轴要显示的位置
y: 540, //文字在y轴要显示的位置
maxLine: 2 //文字最多显示的行数
});
context.stroke();
context.closePath();
context.save(); //保存之前的画布设置
context.draw(true);//true表示保留之前绘制内容
//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
});
},
fail: function (res) {
console.log(res);
}
});
}, 1000);
},
//文本换行
dealWords(options) {
options.ctx.setFontSize(options.fontSize);//设置字体大小
var allRow = Math.ceil(options.ctx.measureText(options.word).width / options.maxWidth);//实际总共能分多少行
var count = allRow >= options.maxLine ? options.maxLine : allRow;//实际能分多少行与设置的最大显示行数比，谁小就用谁做循环次数
var endPos = 0;//当前字符串的截断点
for (var j = 0; j < count; j++) {
var nowStr = options.word.slice(endPos);//当前剩余的字符串
var rowWid = 0;//每一行当前宽度
if (options.ctx.measureText(nowStr).width > options.maxWidth) {//如果当前的字符串宽度大于最大宽度，然后开始截取
for (var m = 0; m < nowStr.length; m++) {
rowWid += options.ctx.measureText(nowStr[m]).width;//当前字符串总宽度
if (rowWid > options.maxWidth) {
if (j === options.maxLine - 1) { //如果是最后一行
options.ctx.fillText(nowStr.slice(0, m - 1) + '...', options.x, options.y + (j + 1) * 25); //(j+1)*20这是每一行的高度
} else {
options.ctx.fillText(nowStr.slice(0, m), options.x, options.y + (j + 1) * 25);
}
endPos += m;//下次截断点
break;
}
}
} else {//如果当前的字符串宽度小于最大宽度就直接输出
options.ctx.fillText(nowStr.slice(0), options.x, options.y + (j + 1) * 25);
}
}
},
//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)
}
})
}
})
},
qrcode_image: function () {
let that = this;
wx.request({
url: 'https://api.weixin.qq.com/cgi-bin/token',
data: {
grant_type: 'client_credential',
appid: '你的APPID', //不能缺少
secret: '你的APPID秘钥' //不能缺少
},
success: function (res) {
wx.request({
url: 'https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=' + res.data.access_token,
data: {
"path": "pages/index/index", //默认跳转到主页:pages/index/index，可指定
"width": 200,
"scene": "type=0&evaId=" + that.data.id,
},
responseType: 'arraybuffer', // 这行很重要,转为二进制数组
header: {
'content-type': 'application/json;charset=utf-8'
},
method: 'POST',
success(res) {
//转为base64
let bin64 = wx.arrayBufferToBase64(res.data);
that.setData({
//base 64设置到页面上
qrcode_image: "data:image/png;base64," + bin64
});
}
})
}
})
}
})Here is the code page
<!--pages/haibao/haibao.wxml-->
<button bindtap="formSubmit">点击生成海报</button>
<view class='imagePathBox' hidden="{{maskHidden == false}}">
<image src="{{imagePath}}" class='shengcheng' ></image>
<button class='baocun' bindtap='baocun'>点击保存至相册,分享到朋友圈</button>
</view>
<view hidden="{{maskHidden == false}}" class="mask"></view>
<view class="canvas-box">
<canvas style="width:375px;height:670px;position:fixed;top:9999px" canvas-id="mycanvas"/>
</view>
The following were also made about the style files
/* pages/mentality/result/result.wxss */
page{ background:#fff;}
.imagePathBox{
width: 100%;
height: 100%;
background: rgba(0,0,0,0.7);
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
z-index: 9999;
}
.mask{
width: 100%;
height: 100%;
/* background: rgba(0,0,0,0.7); */
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
z-index: 9000;
}
.shengcheng{
width: 80%;
height: 80%;
position: fixed;
top: 50rpx;
left: 50%;
margin-left: -40%;
z-index: 10;
}
.baocun{
display: block;
width: 80%;
height: 80rpx;
padding: 0;
line-height: 80rpx;
text-align: center;
position: fixed;
bottom: 50rpx;
left: 10%;
background: #45be8d;
color: #fff;
font-size: 32rpx;
border-radius: 44rpx;
}
.shareFriends{
display: block;
width: 80%;
height: 104rpx;
padding: 0;
line-height: 80rpx;
text-align: center;
position: fixed;
bottom: 50rpx;
left: 10%;
background: #45be8d;
color: rgb(211, 208, 208);
font-size: 32rpx;
border-radius: 44rpx;
}
button[class="baocun"]::after{
border: 0;
}
/* canvas绘图 */
/* .canvas-box{
width:0rpx;
height:0rpx;
overflow: hidden;
position: fixed;
left:0rpx;
bottom:30rpx;
z-index: 9999;
} */
Effect diagram to a
What style should be able to write my own layout like this place is no good test of style
