电子签名功能-微信小程序

微信小程序-电子签名

// XXXX.wxml
<view class="signName">
<canvas class="canvas" id="canvas" canvas-id="canvas" disable-scroll="true" bindtouchstart="canvasStart"
bindtouchmove="canvasMove" bindtouchend="canvasEnd" touchcancel="canvasEnd"
binderror="canvasIdErrorCallback"></canvas>
</view>
<view class="CList
flex">
<view class="flex_item marginR20" >
<view class="saveBtn" bindtap="uploadImg">上传签名</view>
</view>
<view class="flex_item">
<view class="clearBtn" bindtap="cleardraw">清除签名</view>
</view>

var context = null;// 使用 wx.createContext 获取绘图上下文 context
var isButtonDown = false;//是否在绘制中
var arrx = [];//动作横坐标
var arry = [];//动作纵坐标
var arrz = [];//总做状态，标识按下到抬起的一个组合
var canvasw = 0;//画布宽度
var canvash = 0;//画布高度
Page({
data: {
},
onLoad: function () {
this.startCanvas();
},
/**
* 以下 - 手写签名 / 上传签名
*/
startCanvas: function () {//画布初始化执行
var that = this;
//获取系统信息
wx.getSystemInfo({
success: function (res) {
canvasw = res.windowWidth;
canvash = res.windowHeight;
that.setData({ canvasw: canvasw });
that.setData({ canvash: canvash });
}
});
this.initCanvas();
this.cleardraw();
},
//初始化函数
initCanvas: function () {
context = wx.createCanvasContext('canvas');
context.beginPath()
context.fillStyle = 'rgba(255, 255, 255, 0)';
context.setStrokeStyle('#000000');
context.setLineWidth(4);
context.setLineCap('round');
context.setLineJoin('round');
},
canvasStart: function (event) {
isButtonDown = true;
arrz.push(0);
arrx.push(event.changedTouches[0].x);
arry.push(event.changedTouches[0].y);
},
canvasMove: function (event) {
if (isButtonDown) {
arrz.push(1);
arrx.push(event.changedTouches[0].x);
arry.push(event.changedTouches[0].y);
}
for (var i = 0; i < arrx.length; i++) {
if (arrz[i] == 0) {
context.moveTo(arrx[i], arry[i])
} else {
context.lineTo(arrx[i], arry[i])
}
}
context.clearRect(0, 0, canvasw, canvash);
context.setStrokeStyle('#000000');
context.setLineWidth(4);
context.setLineCap('round');
context.setLineJoin('round');
context.stroke();
context.draw(false);
},
canvasEnd: function (event) {
isButtonDown = false;
},
//清除画布
cleardraw: function () {
arrx = [];
arry = [];
arrz = [];
context.clearRect(0, 0, canvasw, canvash);
context.draw(true);
},
uploadImg(){
var that = this
//生成图片
wx.canvasToTempFilePath({
canvasId: 'canvas',
//设置输出图片的宽高
// destWidth:150, 
// destHeight:150,
// fileType:'jpg',
quality:1.0,
success: function (res) {
console.log(res)
// canvas图片地址 res.tempFilePath
},
fail: function () {
wx.showModal({
title: '提示',
content: 'canvas生成图片失败。微信当前版本不支持，请更新到最新版本！',
showCancel: false
});
},
complete: function () {}
})
},
})

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